From 22c0d29724c2b054d8b9f9ed2373103d412f02b3 Mon Sep 17 00:00:00 2001 From: Aargh Rai Date: Wed, 25 Feb 2026 23:46:07 +0530 Subject: king DONE --- src/search/king_moves.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 src/search/king_moves.c (limited to 'src/search/king_moves.c') diff --git a/src/search/king_moves.c b/src/search/king_moves.c new file mode 100644 index 0000000..631b7f0 --- /dev/null +++ b/src/search/king_moves.c @@ -0,0 +1,37 @@ +#include "../search.h" + +void get_king_moves(moves_t* moves, position_t position) { + assert_valid_position(position); + + bitboard_t friendly_king; + int king_square; + bitboard_t friendly_pieces; + if (position.turn == WHITE_TURN) { + friendly_pieces = whites(position); + friendly_king = position.bitboards[WHITE_KING]; + } else { + friendly_pieces = blacks(position); + friendly_king = position.bitboards[BLACK_KING]; + } + king_square = __builtin_ctzll(friendly_king); + + bitboard_t movement; + if (king_square >= 10) { + movement = 920078ULL << (king_square - 10); + } else { + movement = 920078ULL >> -(king_square - 10); + } + if (friendly_king & BITMASK_FILE_A) { + movement &= BITMASK_FILE_A | BITMASK_FILE_B; + } else if (friendly_king & BITMASK_FILE_H) { + movement &= BITMASK_FILE_G | BITMASK_FILE_H; + } + + movement &= ~friendly_pieces; + print_bitboard(movement); + while (movement) { + int to = __builtin_ctzll(movement); + movement &= movement - 1; + add_move(moves, king_square, to); + } +} -- cgit v1.2.3