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The basic data structures of the board correspond tightly to the
board_state struct described in See section 6.3 The board_state struct. They are all
stored in global variables for efficiency reasons, the most important of which
int board_size; Intersection board[MAXSIZE]; int board_ko_pos; float komi; int white_captured; int black_captured; Hash_data hashdata;
The description of the
Position struct is applicable to these
variables also, so we won't duplicate it here. All these variables are
globals for performance reasons. Behind these variables, there are a
number of other private data structures. These implement incremental
handling of strings, liberties and other properties
(see section 19. Incremental Algorithms in Reading). The variable
hashdata contains information
about the hash value for the current position (see section 14.2 Hashing of Positions).
These variables should never be manipulated directly, since they are only the front end for the incremental machinery. They can be read, but should only be written by using the functions described in the next section. If you write directly to them, the incremental data structures will become out of sync with each other, and a crash is the likely result.
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