Author: Artem Pyatakov
Date: 22:37:56 07/17/01
I am not sure if Dr. Hyatt is back yet, so if someone else can answer this I would appreciate it. I was looking at the way Crafty handles repetition and came across the following comment: /* ---------------------------------------------------------- | | | insert the board into the next slot in the repetition | | list. then scan the list. we look for the case where | | the position has been seen one time before, unless we | | are at ply 1 or 2, where we must have seen the same | | position twice prior to this. | | | ---------------------------------------------------------- */ There is also a related comment: "note that for a repetition to happen in the first two plies of the tree, the position has to be repeated three times, while for plies beyond two, two repetitions trigger a draw score." My question is this: Why does Crafty make this exception for plies 1 and 2? What is special about them? Thank you. Artem Pyatakov
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