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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 + DELTA_N
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             && ksq[us] != psq + NORTH
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             && (    distance(ksq[~us], psq + DELTA_N) > 1
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             && (    distance(ksq[~us], psq + NORTH) > 1
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                 || (StepAttacksBB[KING][ksq[us]] & (psq + DELTA_N))))
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                 || (StepAttacksBB[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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             && (  !(StepAttacksBB[KING][ksq[us]] & ~(StepAttacksBB[KING][ksq[~us]] | StepAttacksBB[PAWN][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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    if (Us == WHITE)
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    if (Us == WHITE)
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    {
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    {
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        if (rank_of(psq) < RANK_7)      // Single push
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        if (rank_of(psq) < RANK_7)      // Single push
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            r |= db[index(Them, ksq[Them], ksq[Us], psq + DELTA_N)];
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            r |= db[index(Them, ksq[Them], ksq[Us], psq + NORTH)];
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        if (   rank_of(psq) == RANK_2   // Double push
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        if (   rank_of(psq) == RANK_2   // Double push
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            && psq + DELTA_N != ksq[Us]
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            && psq + NORTH != ksq[Us]
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            && psq + DELTA_N != ksq[Them])
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            && psq + NORTH != ksq[Them])
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            r |= db[index(Them, ksq[Them], ksq[Us], psq + DELTA_N + DELTA_N)];
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            r |= db[index(Them, ksq[Them], ksq[Us], psq + NORTH + NORTH)];
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    }
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    }
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    return result = r & Good  ? Good  : r & UNKNOWN ? UNKNOWN : Bad;
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    return result = r & Good  ? Good  : r & UNKNOWN ? UNKNOWN : Bad;
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  }
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  }
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