result = UNKNOWN;
// Check if two pieces are on the same square or if a king can be captured
- if ( square_distance(wksq, bksq) <= 1
+ if ( distance(wksq, bksq) <= 1
|| wksq == psq
|| bksq == psq
|| (us == WHITE && (StepAttacksBB[PAWN][psq] & bksq)))
// Immediate win if a pawn can be promoted without getting captured
if ( rank_of(psq) == RANK_7
&& wksq != psq + DELTA_N
- && ( square_distance(bksq, psq + DELTA_N) > 1
+ && ( distance(bksq, psq + DELTA_N) > 1
||(StepAttacksBB[KING][wksq] & (psq + DELTA_N))))
result = WIN;
}