return CharToPiece(promoChar) == EmptySquare ? ImpossibleMove : IllegalMove;
else if(flags & F_WHITE_ON_MOVE) {
if( (int) piece < (int) WhiteWazir &&
- (rf >= BOARD_HEIGHT*2/3 || rt >= BOARD_HEIGHT*2/3) ) {
+ (rf >= BOARD_HEIGHT - BOARD_HEIGHT/3 || rt >= BOARD_HEIGHT - BOARD_HEIGHT/3) ) {
if( (piece == WhitePawn || piece == WhiteQueen) && rt > BOARD_HEIGHT-2 ||
piece == WhiteKnight && rt > BOARD_HEIGHT-3) /* promotion mandatory */
cl.kind = promoChar == '=' ? IllegalMove : WhitePromotion;