1.1 --- a/src/chess/rules.h Thu Apr 17 12:16:14 2014 +0200
1.2 +++ b/src/chess/rules.h Wed May 28 15:47:57 2014 +0200
1.3 @@ -38,6 +38,8 @@
1.4 #define INVALID_POSITION 2
1.5 #define AMBIGUOUS_MOVE 3
1.6 #define NEED_PROMOTION 4
1.7 +#define PIECE_PINNED 5
1.8 +#define KING_IN_CHECK 6
1.9
1.10
1.11 #define PIECE_MASK 0x0F
1.12 @@ -167,9 +169,10 @@
1.13 * @param row row of the field to check
1.14 * @param file file of the field to check
1.15 * @param color the color of the piece that should threaten the field
1.16 - * @param threats the array where to store the threats (should be able to the
1.17 - * rare maximum of 16 elements)
1.18 - * @param threatcount a pointer to an uint8_t where to store the amount of threats
1.19 + * @param threats the array where to store the threats (should be able to hold
1.20 + * the rare maximum of 16 elements)
1.21 + * @param threatcount a pointer to an uint8_t where the count of threats is
1.22 + * stored
1.23 * @return TRUE, if any piece of the specified color threatens the specified
1.24 * field (i.e. could capture an opponent piece)
1.25 */
1.26 @@ -187,9 +190,10 @@
1.27 * @param row row of the field to check
1.28 * @param file file of the field to check
1.29 * @param color the color of the piece that should threaten the field
1.30 - * @param threats the array where to store the threats (should be able to the
1.31 - * rare maximum of 16 elements)
1.32 - * @param threatcount a pointer to an uint8_t where to store the amount of threats
1.33 + * @param threats the array where to store the threats (should be able to hold
1.34 + * the rare maximum of 16 elements)
1.35 + * @param threatcount a pointer to an uint8_t where the count of threats is
1.36 + * stored
1.37 * @return TRUE, if any piece of the specified color threatens the specified
1.38 * field (i.e. could capture an opponent piece)
1.39 */
1.40 @@ -242,6 +246,22 @@
1.41 uint8_t color);
1.42
1.43 /**
1.44 + * Checks, if the specified move cannot be performed, because the piece is
1.45 + * either pinned or cannot remove the check.
1.46 + *
1.47 + * Note: in chess a piece is pinned, when it can't be moved because the move
1.48 + * would result in a check position. But this function <u>also</u> returns true,
1.49 + * if the king is already in check position and the specified move does not
1.50 + * protect the king.
1.51 + *
1.52 + * @param gamestate the current game state
1.53 + * @param move the move to check
1.54 + * @return TRUE, if the move cannot be performed because the king would be in
1.55 + * check after the move
1.56 + */
1.57 +_Bool is_pinned(GameState *gamestate, Move *move);
1.58 +
1.59 +/**
1.60 * Evaluates a move syntactically and stores the move data in the specified
1.61 * object.
1.62 *
