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fen: simplify fen_check() + fix e.p. when no possible capture

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Bruno Raoult
2024-05-27 14:54:44 +02:00
parent a7495b67d2
commit 972046351b
5 changed files with 31 additions and 21 deletions
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8
src/position.c
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@@ -336,7 +336,7 @@ bitboard_t pos_king_blockers(const pos_t *pos, const color_t color, const bitboa
* - side-to-move already checking opponent king
* - side-to-move in check more than twice
* - kings distance is 1
* - TODO: discrepancy between piece bitboards and ALL_PIECES bitboards (per color)
* - TODO: - castling / e.p. flags
*
* In case of errors, and @strict is true, @bug_on() is called, and program will
* be terminated.
@@ -349,6 +349,7 @@ bitboard_t pos_king_blockers(const pos_t *pos, const color_t color, const bitboa
bool pos_ok(const pos_t *pos, const bool strict)
{
int n, count = 0, bbcount = 0, error = 0;
color_t us = pos->turn, them = OPPONENT(us);
/* force BUG_ON and WARN_ON */
# pragma push_macro("BUG_ON")
@@ -391,12 +392,11 @@ bool pos_ok(const pos_t *pos, const bool strict)
/* occupied board is different from bitboards */
error += warn_on(count != bbcount);
/* is opponent already in check ? */
error += warn_on(pos_checkers(pos, OPPONENT(pos->turn)));
error += warn_on(pos_checkers(pos, them));
/* is color to play in check more than twice ? */
error += warn_on(popcount64(pos_checkers(pos, pos->turn)) > 2);
error += warn_on(popcount64(pos_checkers(pos, us)) > 2);
/* kings distance is less than 2 */
error += warn_on(sq_dist(pos->king[WHITE], pos->king[BLACK]) < 2);
if (strict) {
bug_on(error);
/* not reached */