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  Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
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  Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
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  Copyright (C) 2015-2018 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
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  Copyright (C) 2015-2019 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
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  Stockfish is free software: you can redistribute it and/or modify
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  Stockfish is free software: you can redistribute it and/or modify
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  it under the terms of the GNU General Public License as published by
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  it under the terms of the GNU General Public License as published by
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  the Free Software Foundation, either version 3 of the License, or
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  the Free Software Foundation, either version 3 of the License, or
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  (at your option) any later version.
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  (at your option) any later version.
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#include "types.h"
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#include "types.h"
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namespace {
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namespace {
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  // There are 24 possible pawn squares: the first 4 files and ranks from 2 to 7
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  // There are 24 possible pawn squares: the first 4 files and ranks from 2 to 7
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  const unsigned MAX_INDEX = 2*24*64*64; // stm * psq * wksq * bksq = 196608
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  constexpr unsigned MAX_INDEX = 2*24*64*64; // stm * psq * wksq * bksq = 196608
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  // Each uint32_t stores results of 32 positions, one per bit
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  // Each uint32_t stores results of 32 positions, one per bit
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  uint32_t KPKBitbase[MAX_INDEX / 32];
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  uint32_t KPKBitbase[MAX_INDEX / 32];
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  // A KPK bitbase index is an integer in [0, IndexMax] range
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  // A KPK bitbase index is an integer in [0, IndexMax] range
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    // Black to move: If one move leads to a position classified as DRAW, the result
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    // Black to move: If one move leads to a position classified as DRAW, the result
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    // of the current position is DRAW. If all moves lead to positions classified
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    // of the current position is DRAW. If all moves lead to positions classified
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    // as WIN, the position is classified as WIN, otherwise the current position is
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    // as WIN, the position is classified as WIN, otherwise the current position is
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    // classified as UNKNOWN.
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    // classified as UNKNOWN.
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    const Color  Them = (Us == WHITE ? BLACK : WHITE);
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    constexpr Color  Them = (Us == WHITE ? BLACK : WHITE);
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    const Result Good = (Us == WHITE ? WIN   : DRAW);
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    constexpr Result Good = (Us == WHITE ? WIN   : DRAW);
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    const Result Bad  = (Us == WHITE ? DRAW  : WIN);
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    constexpr Result Bad  = (Us == WHITE ? DRAW  : WIN);
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    Result r = INVALID;
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    Result r = INVALID;
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    Bitboard b = PseudoAttacks[KING][ksq[Us]];
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    Bitboard b = PseudoAttacks[KING][ksq[Us]];
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    while (b)
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    while (b)