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There are some basic definitions in gnugo.h which are used everywhere. The most important of these are the numeric declarations of colors. Each intersection on the board is represented by one of these:
color value EMPTY 0 WHITE 1 BLACK 2
In addition to these, the following values can be used in special places, such as describing the borders of eyes:
color value GRAY (GRAY_BORDER) 3 WHITE_BORDER 4 BLACK_BORDER 5
There is a macro,
OTHER_COLOR(color) which can be used to get the
other color than the parameter. This macro can only be used on
BLACK, but not on
EMPTY or one of the border colors.
GNU Go uses two different representations of the board, for most purposes a one-dimensional one, but for a few purposes a two dimensional one (see section 8. The Board Library). The one-dimensional board was introduced before GNU Go 3.2, while the two-dimensional board dates back to the ancestral program written by Man Lung Li before 1995. The API still uses the one-dimensional board, so the API functions have not changed much since GNU Go 3.0.
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