It seems that it does not consider enemy attacks. Tested on this board: <code clas

King blocked at last rank about chess22k HOT 3 CLOSED

sandermvdb commented on May 18, 2024

King blocked at last rank

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Comments (3)

sandermvdb commented on May 18, 2024

Thanks for raising this issue 👍
I've updated the code which will be part of the 1.8 release:

private static boolean kingBlockedAtLastRank(final int kingIndex, final int kingColor, final ChessBoard cb) {
    return cb.colorToMove != kingColor && (Bitboard.RANKS[7 * kingColor] & cb.pieces[kingColor][KING]) != 0 
      && (StaticMoves.KING_MOVES[kingIndex] & cb.emptySpaces & ~cb.attacksAll[1 - kingColor] & Bitboard.RANKS[7 * kingColor]) 
      == (StaticMoves.KING_MOVES[kingIndex] & cb.emptySpaces & ~cb.attacksAll[1 - kingColor]);
}

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ratosh commented on May 18, 2024

Still a small problem when moving a rook or a queen from rank6 to rank7. attacksAll will have attacks to rank6 and this function when detecting safe rook checks will return the king is blocked.
3k4/7R/8/8/8/8/8/7K w - -

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sandermvdb commented on May 18, 2024

Performance vs accuracy...

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