Author: J. Wesley Cleveland
Date: 09:50:05 03/31/99
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On March 31, 1999 at 12:08:49, James Robertson wrote: >I have noticed from a post below that some people consider the position a draw >if it has repeated twice in the search. What are the advantages and >disadvantages of this? I am currently waiting until 3rd repetition; is this >worse? > The advantage is that it can considerably reduce your search. One disadvantage is that if your program takes a wrong approach in a position where it has an advantage, it may not be able to try a different way because it would a repetition. Another possible disadvantage is that if your program thinks a draw is a good result, it will always try to repeat moves even if it has a better move. A problem specifically with crafty annotate mode, is that if a player repeats moves in a won position, crafty scores that move as a draw. One possible solution for these problems would be to evaluate a repetition in the search (from the current position forward) as a draw, but a first repetition of a position before the current position as drawish.
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