From: Peter Drake <[EMAIL PROTECTED]>
> It seems too expensive to search every point on the board for ladders. What
> to do?
Perhaps it would be worthwhile to preserve state from board to board - there
are unlikely to be more than 2 or 3 ladders on any given board. When a stone is
played, determine whether a new ladder has been created, or the status of an
existing ladder has changed.
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