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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) 2015-2016 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
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  Copyright (C) 2015-2018 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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  KPKPosition::KPKPosition(unsigned idx) {
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  KPKPosition::KPKPosition(unsigned idx) {
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    ksq[WHITE] = Square((idx >>  0) & 0x3F);
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    ksq[WHITE] = Square((idx >>  0) & 0x3F);
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    ksq[BLACK] = Square((idx >>  6) & 0x3F);
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    ksq[BLACK] = Square((idx >>  6) & 0x3F);
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    us         = Color ((idx >> 12) & 0x01);
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    us         = Color ((idx >> 12) & 0x01);
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    psq        = make_square(File((idx >> 13) & 0x3), RANK_7 - Rank((idx >> 15) & 0x7));
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    psq        = make_square(File((idx >> 13) & 0x3), Rank(RANK_7 - ((idx >> 15) & 0x7)));
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    // Check if two pieces are on the same square or if a king can be captured
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    // Check if two pieces are on the same square or if a king can be captured
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    if (   distance(ksq[WHITE], ksq[BLACK]) <= 1
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    if (   distance(ksq[WHITE], ksq[BLACK]) <= 1
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        || ksq[WHITE] == psq
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        || ksq[WHITE] == psq
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        || ksq[BLACK] == psq
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        || ksq[BLACK] == psq
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        || (us == WHITE && (StepAttacksBB[PAWN][psq] & ksq[BLACK])))
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        || (us == WHITE && (PawnAttacks[WHITE][psq] & ksq[BLACK])))
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        result = INVALID;
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        result = INVALID;
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    // Immediate win if a pawn can be promoted without getting captured
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    // Immediate win if a pawn can be promoted without getting captured
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    else if (   us == WHITE
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    else if (   us == WHITE
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             && rank_of(psq) == RANK_7
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             && rank_of(psq) == RANK_7
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             && ksq[us] != psq + NORTH
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             && ksq[us] != psq + NORTH
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             && (    distance(ksq[~us], psq + NORTH) > 1
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             && (    distance(ksq[~us], psq + NORTH) > 1
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                 || (StepAttacksBB[KING][ksq[us]] & (psq + NORTH))))
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                 || (PseudoAttacks[KING][ksq[us]] & (psq + NORTH))))
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        result = WIN;
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        result = WIN;
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    // Immediate draw if it is a stalemate or a king captures undefended pawn
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    // Immediate draw if it is a stalemate or a king captures undefended pawn
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    else if (   us == BLACK
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    else if (   us == BLACK
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             && (  !(StepAttacksBB[KING][ksq[us]] & ~(StepAttacksBB[KING][ksq[~us]] | StepAttacksBB[PAWN][psq]))
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             && (  !(PseudoAttacks[KING][ksq[us]] & ~(PseudoAttacks[KING][ksq[~us]] | PawnAttacks[~us][psq]))
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                 || (StepAttacksBB[KING][ksq[us]] & psq & ~StepAttacksBB[KING][ksq[~us]])))
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                 || (PseudoAttacks[KING][ksq[us]] & psq & ~PseudoAttacks[KING][ksq[~us]])))
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        result = DRAW;
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        result = DRAW;
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    // Position will be classified later
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    // Position will be classified later
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    else
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    else
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        result = UNKNOWN;
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        result = UNKNOWN;
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    const Color  Them = (Us == WHITE ? BLACK : WHITE);
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    const Color  Them = (Us == WHITE ? BLACK : WHITE);
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    const Result Good = (Us == WHITE ? WIN   : DRAW);
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    const Result Good = (Us == WHITE ? WIN   : DRAW);
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    const Result Bad  = (Us == WHITE ? DRAW  : WIN);
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    const 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 = StepAttacksBB[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)
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        r |= Us == WHITE ? db[index(Them, ksq[Them]  , pop_lsb(&b), psq)]
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        r |= Us == WHITE ? db[index(Them, ksq[Them]  , pop_lsb(&b), psq)]
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                         : db[index(Them, pop_lsb(&b), ksq[Them]  , psq)];
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                         : db[index(Them, pop_lsb(&b), ksq[Them]  , psq)];
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