Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 99 | pmbaty | 1 | /* |
| 2 | Texel - A UCI chess engine. |
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| 3 | Copyright (C) 2012-2014 Peter Österlund, peterosterlund2@gmail.com |
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| 4 | |||
| 5 | This program is free software: you can redistribute it and/or modify |
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| 6 | it under the terms of the GNU General Public License as published by |
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| 7 | the Free Software Foundation, either version 3 of the License, or |
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| 8 | (at your option) any later version. |
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| 9 | |||
| 10 | This program is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 13 | GNU General Public License for more details. |
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| 14 | |||
| 15 | You should have received a copy of the GNU General Public License |
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| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
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| 17 | */ |
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| 18 | |||
| 19 | /* |
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| 20 | * game.cpp |
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| 21 | * |
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| 22 | * Created on: Feb 25, 2012 |
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| 23 | * Author: petero |
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| 24 | */ |
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| 25 | |||
| 26 | #include "game.hpp" |
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| 27 | #include "moveGen.hpp" |
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| 28 | #include "textio.hpp" |
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| 29 | #include "util/timeUtil.hpp" |
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| 30 | |||
| 31 | #include <iostream> |
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| 32 | #include <iomanip> |
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| 33 | #include <cassert> |
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| 34 | |||
| 35 | |||
| 36 | Game::Game(const std::shared_ptr<Player>& whitePlayer, |
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| 37 | const std::shared_ptr<Player>& blackPlayer) { |
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| 38 | this->whitePlayer = whitePlayer; |
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| 39 | this->blackPlayer = blackPlayer; |
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| 40 | handleCommand("new"); |
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| 41 | } |
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| 42 | |||
| 43 | bool |
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| 44 | Game::processString(const std::string& str) { |
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| 45 | if (handleCommand(str)) |
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| 46 | return true; |
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| 47 | if (getGameState() != ALIVE) |
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| 48 | return false; |
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| 49 | |||
| 50 | Move m = TextIO::stringToMove(pos, str); |
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| 51 | if (m.isEmpty()) |
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| 52 | return false; |
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| 53 | |||
| 54 | UndoInfo ui; |
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| 55 | pos.makeMove(m, ui); |
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| 56 | TextIO::fixupEPSquare(pos); |
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| 57 | if (currentMove < (int)moveList.size()) { |
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| 58 | moveList.erase(moveList.begin() + currentMove, moveList.end()); |
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| 59 | uiInfoList.erase(uiInfoList.begin() + currentMove, uiInfoList.end()); |
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| 60 | drawOfferList.erase(drawOfferList.begin() + currentMove, drawOfferList.end()); |
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| 61 | } |
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| 62 | moveList.push_back(m); |
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| 63 | uiInfoList.push_back(ui); |
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| 64 | drawOfferList.push_back(pendingDrawOffer); |
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| 65 | pendingDrawOffer = false; |
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| 66 | currentMove++; |
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| 67 | return true; |
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| 68 | } |
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| 69 | |||
| 70 | std::string |
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| 71 | Game::getGameStateString() { |
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| 72 | switch (getGameState()) { |
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| 73 | case ALIVE: |
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| 74 | return ""; |
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| 75 | case WHITE_MATE: |
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| 76 | return "Game over, white mates!"; |
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| 77 | case BLACK_MATE: |
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| 78 | return "Game over, black mates!"; |
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| 79 | case WHITE_STALEMATE: |
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| 80 | case BLACK_STALEMATE: |
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| 81 | return "Game over, draw by stalemate!"; |
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| 82 | case DRAW_REP: |
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| 83 | { |
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| 84 | std::string ret = "Game over, draw by repetition!"; |
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| 85 | if (drawStateMoveStr.length() > 0) |
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| 86 | ret += " [" + drawStateMoveStr + "]"; |
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| 87 | return ret; |
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| 88 | } |
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| 89 | case DRAW_50: |
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| 90 | { |
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| 91 | std::string ret = "Game over, draw by 50 move rule!"; |
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| 92 | if (drawStateMoveStr.length() > 0) |
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| 93 | ret += " [" + drawStateMoveStr + "]"; |
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| 94 | return ret; |
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| 95 | } |
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| 96 | case DRAW_NO_MATE: |
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| 97 | return "Game over, draw by impossibility of mate!"; |
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| 98 | case DRAW_AGREE: |
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| 99 | return "Game over, draw by agreement!"; |
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| 100 | case RESIGN_WHITE: |
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| 101 | return "Game over, white resigns!"; |
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| 102 | case RESIGN_BLACK: |
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| 103 | return "Game over, black resigns!"; |
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| 104 | default: |
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| 105 | assert(false); |
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| 106 | return ""; |
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| 107 | } |
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| 108 | } |
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| 109 | |||
| 110 | Move |
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| 111 | Game::getLastMove() { |
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| 112 | Move m; |
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| 113 | if (currentMove > 0) |
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| 114 | m = moveList[currentMove - 1]; |
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| 115 | return m; |
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| 116 | } |
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| 117 | |||
| 118 | Game::GameState |
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| 119 | Game::getGameState() { |
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| 120 | MoveList moves; |
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| 121 | MoveGen::pseudoLegalMoves(pos, moves); |
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| 122 | MoveGen::removeIllegal(pos, moves); |
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| 123 | if (moves.size == 0) { |
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| 124 | if (MoveGen::inCheck(pos)) |
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| 125 | return pos.isWhiteMove() ? BLACK_MATE : WHITE_MATE; |
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| 126 | else |
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| 127 | return pos.isWhiteMove() ? WHITE_STALEMATE : BLACK_STALEMATE; |
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| 128 | } |
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| 129 | if (insufficientMaterial()) |
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| 130 | return DRAW_NO_MATE; |
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| 131 | if (resignState != ALIVE) |
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| 132 | return resignState; |
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| 133 | return drawState; |
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| 134 | } |
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| 135 | |||
| 136 | bool |
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| 137 | Game::haveDrawOffer() { |
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| 138 | if (currentMove > 0) |
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| 139 | return drawOfferList[currentMove - 1]; |
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| 140 | else |
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| 141 | return false; |
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| 142 | } |
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| 143 | |||
| 144 | bool |
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| 145 | Game::handleCommand(const std::string& moveStr) { |
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| 146 | if (moveStr == "new") { |
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| 147 | moveList.clear(); |
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| 148 | uiInfoList.clear(); |
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| 149 | drawOfferList.clear(); |
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| 150 | currentMove = 0; |
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| 151 | pendingDrawOffer = false; |
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| 152 | drawState = ALIVE; |
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| 153 | resignState = ALIVE; |
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| 154 | pos = TextIO::readFEN(TextIO::startPosFEN); |
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| 155 | whitePlayer->clearTT(); |
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| 156 | blackPlayer->clearTT(); |
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| 157 | activateHumanPlayer(); |
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| 158 | return true; |
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| 159 | } else if (moveStr == "undo") { |
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| 160 | if (currentMove > 0) { |
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| 161 | pos.unMakeMove(moveList[currentMove - 1], uiInfoList[currentMove - 1]); |
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| 162 | currentMove--; |
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| 163 | pendingDrawOffer = false; |
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| 164 | drawState = ALIVE; |
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| 165 | resignState = ALIVE; |
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| 166 | return handleCommand("swap"); |
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| 167 | } else { |
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| 168 | std::cout << "Nothing to undo" << std::endl; |
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| 169 | } |
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| 170 | return true; |
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| 171 | } else if (moveStr == "redo") { |
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| 172 | if (currentMove < (int)moveList.size()) { |
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| 173 | pos.makeMove(moveList[currentMove], uiInfoList[currentMove]); |
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| 174 | currentMove++; |
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| 175 | pendingDrawOffer = false; |
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| 176 | return handleCommand("swap"); |
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| 177 | } else { |
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| 178 | std::cout << "Nothing to redo" << std::endl; |
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| 179 | } |
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| 180 | return true; |
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| 181 | } else if (moveStr == "swap" || moveStr == "go") { |
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| 182 | std::swap(whitePlayer, blackPlayer); |
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| 183 | return true; |
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| 184 | } else if (moveStr == "list") { |
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| 185 | listMoves(); |
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| 186 | return true; |
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| 187 | } else if (startsWith(moveStr, "setpos ")) { |
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| 188 | std::string fen = moveStr.substr(moveStr.find_first_of(' ') + 1); |
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| 189 | try { |
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| 190 | Position newPos(TextIO::readFEN(fen)); |
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| 191 | handleCommand("new"); |
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| 192 | pos = newPos; |
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| 193 | activateHumanPlayer(); |
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| 194 | } catch (const ChessParseError& ex) { |
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| 195 | std::cout << "Invalid FEN: " << fen << " (" << ex.what() << ")" << std::endl; |
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| 196 | } |
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| 197 | return true; |
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| 198 | } else if (moveStr == "getpos") { |
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| 199 | std::string fen(TextIO::toFEN(pos)); |
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| 200 | std::cout << fen << std::endl; |
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| 201 | return true; |
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| 202 | } else if (startsWith(moveStr, "draw ")) { |
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| 203 | if (getGameState() == ALIVE) { |
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| 204 | std::string drawCmd = moveStr.substr(moveStr.find_first_of(' ') + 1); |
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| 205 | return handleDrawCmd(drawCmd); |
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| 206 | } else { |
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| 207 | return true; |
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| 208 | } |
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| 209 | } else if (moveStr == "resign") { |
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| 210 | if (getGameState()== ALIVE) { |
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| 211 | resignState = pos.isWhiteMove() ? RESIGN_WHITE : RESIGN_BLACK; |
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| 212 | return true; |
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| 213 | } else { |
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| 214 | return true; |
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| 215 | } |
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| 216 | } else if (startsWith(moveStr, "book")) { |
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| 217 | std::string bookCmd = moveStr.substr(moveStr.find_first_of(' ') + 1); |
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| 218 | return handleBookCmd(bookCmd); |
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| 219 | } else if (startsWith(moveStr, "time")) { |
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| 220 | std::string timeStr = moveStr.substr(moveStr.find_first_of(' ') + 1); |
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| 221 | int timeLimit; |
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| 222 | if (!str2Num(timeStr, timeLimit)) { |
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| 223 | std::cout << "Can not parse number: " << timeStr << std::endl; |
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| 224 | return false; |
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| 225 | } |
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| 226 | whitePlayer->timeLimit(timeLimit, timeLimit); |
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| 227 | blackPlayer->timeLimit(timeLimit, timeLimit); |
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| 228 | return true; |
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| 229 | } else if (startsWith(moveStr, "perft ")) { |
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| 230 | std::string depthStr = moveStr.substr(moveStr.find_first_of(' ') + 1); |
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| 231 | int depth; |
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| 232 | if (!str2Num(depthStr, depth)) { |
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| 233 | std::cout << "Can not parse number: " << depthStr << std::endl; |
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| 234 | return false; |
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| 235 | } |
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| 236 | S64 t0 = currentTimeMillis(); |
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| 237 | U64 nodes = perfT(pos, depth); |
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| 238 | S64 t1 = currentTimeMillis(); |
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| 239 | double t = (t1 - t0) * 1e-3; |
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| 240 | std::stringstream ss; |
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| 241 | ss.precision(3); |
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| 242 | std::cout << "perft(" << depth << ") = " << nodes << ", t=" |
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| 243 | << (ss << std::fixed << t).rdbuf() |
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| 244 | << "s" << std::endl; |
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| 245 | return true; |
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| 246 | } else { |
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| 247 | return false; |
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| 248 | } |
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| 249 | } |
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| 250 | |||
| 251 | void |
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| 252 | Game::activateHumanPlayer() { |
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| 253 | if (!(pos.isWhiteMove() ? whitePlayer : blackPlayer)->isHumanPlayer()) |
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| 254 | std::swap(whitePlayer, blackPlayer); |
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| 255 | } |
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| 256 | |||
| 257 | void |
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| 258 | Game::getPosHistory(std::vector<std::string> ret) { |
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| 259 | ret.clear(); |
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| 260 | Position pos(this->pos); |
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| 261 | for (int i = currentMove; i > 0; i--) |
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| 262 | pos.unMakeMove(moveList[i - 1], uiInfoList[i - 1]); |
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| 263 | ret.push_back(TextIO::toFEN(pos)); // Store initial FEN |
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| 264 | |||
| 265 | std::string moves; |
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| 266 | UndoInfo ui; |
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| 267 | for (size_t i = 0; i < moveList.size(); i++) { |
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| 268 | const Move& move = moveList[i]; |
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| 269 | std::string strMove(TextIO::moveToString(pos, move, false)); |
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| 270 | moves += ' '; |
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| 271 | moves += strMove; |
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| 272 | pos.makeMove(move, ui); |
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| 273 | } |
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| 274 | ret.push_back(moves); // Store move list string |
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| 275 | |||
| 276 | int numUndo = (int)moveList.size() - currentMove; |
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| 277 | ret.push_back(num2Str(numUndo)); |
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| 278 | } |
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| 279 | |||
| 280 | std::string |
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| 281 | Game::getMoveListString(bool compressed) { |
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| 282 | std::string ret; |
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| 283 | |||
| 284 | // Undo all moves in move history. |
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| 285 | Position pos(this->pos); |
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| 286 | for (int i = currentMove; i > 0; i--) |
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| 287 | pos.unMakeMove(moveList[i - 1], uiInfoList[i - 1]); |
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| 288 | |||
| 289 | // Print all moves |
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| 290 | std::string whiteMove; |
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| 291 | std::string blackMove; |
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| 292 | for (int i = 0; i < currentMove; i++) { |
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| 293 | const Move& move = moveList[i]; |
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| 294 | std::string strMove = TextIO::moveToString(pos, move, false); |
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| 295 | if (drawOfferList[i]) |
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| 296 | strMove += " (d)"; |
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| 297 | if (pos.isWhiteMove()) { |
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| 298 | whiteMove = strMove; |
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| 299 | } else { |
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| 300 | blackMove = strMove; |
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| 301 | if (whiteMove.length() == 0) |
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| 302 | whiteMove = "..."; |
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| 303 | if (compressed) { |
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| 304 | ret += num2Str(pos.getFullMoveCounter()) + ". " + whiteMove + |
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| 305 | " " + blackMove + " "; |
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| 306 | } else { |
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| 307 | std::stringstream ss; |
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| 308 | ss << std::setw(3) << pos.getFullMoveCounter() << ". " |
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| 309 | << std::setw(10) << std::left << whiteMove << " " |
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| 310 | << std::setw(10) << std::left << blackMove << std::endl; |
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| 311 | ret += ss.str(); |
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| 312 | } |
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| 313 | whiteMove.clear(); |
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| 314 | blackMove.clear(); |
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| 315 | } |
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| 316 | UndoInfo ui; |
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| 317 | pos.makeMove(move, ui); |
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| 318 | } |
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| 319 | if ((whiteMove.length() > 0) || (blackMove.length() > 0)) { |
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| 320 | if (whiteMove.length() == 0) |
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| 321 | whiteMove = "..."; |
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| 322 | if (compressed) { |
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| 323 | ret += num2Str(pos.getFullMoveCounter()) + ". " + whiteMove + |
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| 324 | " " + blackMove + " "; |
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| 325 | } else { |
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| 326 | std::stringstream ss; |
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| 327 | ss << std::setw(3) << pos.getFullMoveCounter() << ". " |
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| 328 | << std::setw(10) << std::left << whiteMove << " " |
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| 329 | << std::setw(10) << std::left << blackMove << std::endl; |
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| 330 | ret += ss.str(); |
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| 331 | } |
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| 332 | } |
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| 333 | std::string gameResult = getPGNResultString(); |
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| 334 | if (gameResult != "*") { |
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| 335 | ret += gameResult; |
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| 336 | if (!compressed) |
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| 337 | ret += '\n'; |
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| 338 | } |
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| 339 | return ret; |
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| 340 | } |
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| 341 | |||
| 342 | std::string |
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| 343 | Game::getPGNResultString() { |
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| 344 | std::string gameResult = "*"; |
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| 345 | switch (getGameState()) { |
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| 346 | case ALIVE: |
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| 347 | break; |
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| 348 | case WHITE_MATE: |
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| 349 | case RESIGN_BLACK: |
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| 350 | gameResult = "1-0"; |
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| 351 | break; |
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| 352 | case BLACK_MATE: |
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| 353 | case RESIGN_WHITE: |
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| 354 | gameResult = "0-1"; |
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| 355 | break; |
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| 356 | case WHITE_STALEMATE: |
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| 357 | case BLACK_STALEMATE: |
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| 358 | case DRAW_REP: |
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| 359 | case DRAW_50: |
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| 360 | case DRAW_NO_MATE: |
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| 361 | case DRAW_AGREE: |
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| 362 | gameResult = "1/2-1/2"; |
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| 363 | break; |
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| 364 | } |
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| 365 | return gameResult; |
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| 366 | } |
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| 367 | |||
| 368 | /** Return a list of previous positions in this game, back to the last "zeroing" move. */ |
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| 369 | void |
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| 370 | Game::getHistory(std::vector<Position>& posList) { |
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| 371 | posList.clear(); |
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| 372 | Position pos(this->pos); |
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| 373 | for (int i = currentMove; i > 0; i--) { |
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| 374 | if (pos.getHalfMoveClock() == 0) |
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| 375 | break; |
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| 376 | pos.unMakeMove(moveList[i - 1], uiInfoList[i - 1]); |
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| 377 | posList.push_back(pos); |
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| 378 | } |
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| 379 | std::reverse(posList.begin(), posList.end()); |
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| 380 | } |
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| 381 | |||
| 382 | void |
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| 383 | Game::listMoves() { |
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| 384 | std::string movesStr = getMoveListString(false); |
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| 385 | std::cout << movesStr; |
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| 386 | } |
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| 387 | |||
| 388 | bool |
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| 389 | Game::handleDrawCmd(std::string drawCmd) { |
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| 390 | if (startsWith(drawCmd, "rep") || startsWith(drawCmd, "50")) { |
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| 391 | bool rep = startsWith(drawCmd, "rep"); |
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| 392 | Move m; |
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| 393 | size_t idx = drawCmd.find_first_of(' '); |
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| 394 | std::string ms; |
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| 395 | if (idx != drawCmd.npos) { |
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| 396 | ms = drawCmd.substr(idx + 1); |
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| 397 | if (ms.length() > 0) |
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| 398 | m = TextIO::stringToMove(pos, ms); |
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| 399 | } |
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| 400 | bool valid; |
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| 401 | if (rep) { |
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| 402 | valid = false; |
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| 403 | std::vector<Position> oldPositions; |
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| 404 | if (!m.isEmpty()) { |
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| 405 | UndoInfo ui; |
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| 406 | Position tmpPos(pos); |
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| 407 | tmpPos.makeMove(m, ui); |
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| 408 | oldPositions.push_back(tmpPos); |
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| 409 | } |
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| 410 | oldPositions.push_back(pos); |
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| 411 | Position tmpPos(pos); |
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| 412 | for (int i = currentMove - 1; i >= 0; i--) { |
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| 413 | tmpPos.unMakeMove(moveList[i], uiInfoList[i]); |
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| 414 | oldPositions.push_back(tmpPos); |
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| 415 | } |
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| 416 | int repetitions = 0; |
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| 417 | Position firstPos = oldPositions[0]; |
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| 418 | for (size_t i = 0; i < oldPositions.size(); i++) { |
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| 419 | if (oldPositions[i].drawRuleEquals(firstPos)) |
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| 420 | repetitions++; |
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| 421 | } |
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| 422 | if (repetitions >= 3) { |
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| 423 | valid = true; |
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| 424 | } |
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| 425 | } else { |
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| 426 | Position tmpPos(pos); |
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| 427 | if (!m.isEmpty()) { |
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| 428 | UndoInfo ui; |
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| 429 | tmpPos.makeMove(m, ui); |
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| 430 | } |
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| 431 | valid = tmpPos.getHalfMoveClock() >= 100; |
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| 432 | } |
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| 433 | if (valid) { |
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| 434 | drawState = rep ? DRAW_REP : DRAW_50; |
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| 435 | drawStateMoveStr.clear(); |
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| 436 | if (!m.isEmpty()) |
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| 437 | drawStateMoveStr = TextIO::moveToString(pos, m, false); |
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| 438 | } else { |
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| 439 | pendingDrawOffer = true; |
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| 440 | if (!m.isEmpty()) |
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| 441 | processString(ms); |
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| 442 | } |
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| 443 | return true; |
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| 444 | } else if (startsWith(drawCmd, "offer ")) { |
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| 445 | pendingDrawOffer = true; |
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| 446 | size_t idx = drawCmd.find_first_of(' '); |
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| 447 | if (idx != drawCmd.npos) { |
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| 448 | std::string ms = drawCmd.substr(idx + 1); |
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| 449 | if (!TextIO::stringToMove(pos, ms).isEmpty()) |
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| 450 | processString(ms); |
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| 451 | } |
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| 452 | return true; |
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| 453 | } else if (drawCmd == "accept") { |
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| 454 | if (haveDrawOffer()) |
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| 455 | drawState = DRAW_AGREE; |
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| 456 | return true; |
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| 457 | } else { |
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| 458 | return false; |
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| 459 | } |
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| 460 | } |
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| 461 | |||
| 462 | bool |
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| 463 | Game::handleBookCmd(const std::string& bookCmd) { |
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| 464 | if (bookCmd == "off") { |
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| 465 | whitePlayer->useBook(false); |
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| 466 | blackPlayer->useBook(false); |
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| 467 | return true; |
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| 468 | } else if (bookCmd == "on") { |
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| 469 | whitePlayer->useBook(true); |
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| 470 | whitePlayer->useBook(true); |
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| 471 | return true; |
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| 472 | } |
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| 473 | return false; |
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| 474 | } |
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| 475 | |||
| 476 | bool |
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| 477 | Game::insufficientMaterial() { |
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| 478 | if (pos.pieceTypeBB(Piece::WQUEEN) != 0) return false; |
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| 479 | if (pos.pieceTypeBB(Piece::WROOK) != 0) return false; |
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| 480 | if (pos.pieceTypeBB(Piece::WPAWN) != 0) return false; |
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| 481 | if (pos.pieceTypeBB(Piece::BQUEEN) != 0) return false; |
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| 482 | if (pos.pieceTypeBB(Piece::BROOK) != 0) return false; |
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| 483 | if (pos.pieceTypeBB(Piece::BPAWN) != 0) return false; |
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| 484 | int wb = BitBoard::bitCount(pos.pieceTypeBB(Piece::WBISHOP)); |
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| 485 | int wn = BitBoard::bitCount(pos.pieceTypeBB(Piece::WKNIGHT)); |
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| 486 | int bb = BitBoard::bitCount(pos.pieceTypeBB(Piece::BBISHOP)); |
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| 487 | int bn = BitBoard::bitCount(pos.pieceTypeBB(Piece::BKNIGHT)); |
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| 488 | if (wb + wn + bb + bn <= 1) |
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| 489 | return true; // King + bishop/knight vs king is draw |
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| 490 | if (wn + bn == 0) { |
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| 491 | // Only bishops. If they are all on the same color, the position is a draw. |
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| 492 | U64 bMask = pos.pieceTypeBB(Piece::WBISHOP) | pos.pieceTypeBB(Piece::BBISHOP); |
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| 493 | if (((bMask & BitBoard::maskDarkSq) == 0) || |
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| 494 | ((bMask & BitBoard::maskLightSq) == 0)) |
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| 495 | return true; |
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| 496 | } |
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| 497 | return false; |
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| 498 | } |
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| 499 | |||
| 500 | U64 |
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| 501 | Game::perfT(Position& pos, int depth) { |
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| 502 | if (depth == 0) |
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| 503 | return 1; |
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| 504 | U64 nodes = 0; |
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| 505 | MoveList moves; |
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| 506 | MoveGen::pseudoLegalMoves(pos, moves); |
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| 507 | MoveGen::removeIllegal(pos, moves); |
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| 508 | if (depth == 1) |
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| 509 | return moves.size; |
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| 510 | UndoInfo ui; |
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| 511 | for (int mi = 0; mi < moves.size; mi++) { |
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| 512 | const Move& m = moves[mi]; |
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| 513 | pos.makeMove(m, ui); |
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| 514 | nodes += perfT(pos, depth - 1); |
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| 515 | pos.unMakeMove(m, ui); |
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| 516 | } |
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| 517 | return nodes; |
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| 518 | } |