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add position blockers

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Bruno Raoult
2024-03-12 10:44:25 +01:00
parent 08082faed3
commit cc3754ae00
4 changed files with 57 additions and 21 deletions
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43
src/position.c
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@@ -132,18 +132,46 @@ bitboard_t pos_checkers(const pos_t *pos, const color_t color)
}
/**
* pos_pinners() - find all pinners on a king.
* pos_king_pinners() - get the "pinners" on a king "pinners".
* @pos: &position
* @color: king color
* @color: king color.
*
* Get a bitboard of all pinners on @color king.
* Just a wrapper over @sq_pinners().
* get position "pinners" on @color king. Here, pinner means a piece separated from king
* by one piece (any color) only.
* This is just a wrapper over @sq_pinners().
*
* @return: a bitboard of pinners.
* @return: pinners bitboard.
*/
bitboard_t pos_pinners(const pos_t *pos, const color_t color)
bitboard_t pos_king_pinners(const pos_t *pos, const color_t color)
{
return sq_pinners(pos, pos->king[color], OPPONENT(color));
return sq_pinners(pos, pos->king[color], OPPONENT(pos->turn));
}
/**
* pos_king_blockers() - get the pin blockers on a king.
* @pos: &position
* @color: king color.
* @pinners: pinners bitboard.
*
* get @pinners blockers pieces on @color king.
*
* @return: blockers bitboard.
*/
bitboard_t pos_king_blockers(const pos_t *pos, const color_t color, const bitboard_t pinners)
{
bitboard_t tmp, blockers = 0, occ = pos_occ(pos);
square_t pinner, king = pos->king[color];
bit_for_each64(pinner, tmp, pinners) {
bitboard_t blocker = bb_between_excl[pinner][king] & occ;
warn_on(popcount64(blocker) != 1);
if (popcount64(blocker) != 1) {
printf("n blockers = %d\n", popcount64(blocker));
bb_print("blockers", blocker);
}
blockers |= blocker;
}
return blockers;
}
/**
@@ -233,6 +261,7 @@ void pos_print(const pos_t *pos)
printf("fen %s\n", pos2fen(pos, str));
printf("checkers: %s\n", pos_checkers2str(pos, str, sizeof(str)));
printf("pinners : %s\n", pos_pinners2str(pos, str, sizeof(str)));
printf("blockers: %s\n", pos_blockers2str(pos, str, sizeof(str)));
}
/**