tactics.h

   1 #ifndef ZZGO_TACTICS_H
   2 #define ZZGO_TACTICS_H
   3
   4 /* Advanced tactical checks non-essential to the board implementation. */
   5
   6 #include "board.h"
   7
   8 /* Check if this move is undesirable self-atari (resulting group would have
   9  * only single liberty and not capture anything; ko is allowed); we mostly
  10  * want to avoid these moves. The function actually does a rather elaborate
  11  * tactical check, allowing self-atari moves that are nakade, eye falsification
  12  * or throw-ins. */
  13 static bool is_bad_selfatari(struct board *b, enum stone color, coord_t to);
  14
  15 /* Checks if there are any stones in n-vincinity of coord. */
  16 bool board_stone_radar(struct board *b, coord_t coord, int distance);
  17
  18
  19 bool is_bad_selfatari_slow(struct board *b, enum stone color, coord_t to);
  20 static inline bool
  21 is_bad_selfatari(struct board *b, enum stone color, coord_t to)
  22 {
  23         /* More than one immediate liberty, thumbs up! */
  24         if (immediate_liberty_count(b, to) > 1)
  25                 return false;
  26
  27         return is_bad_selfatari_slow(b, color, to);
  28 }
  29
  30 #endif