Author: Uri Blass
Date: 22:43:39 11/27/03
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On November 28, 2003 at 01:21:16, Russell Reagan wrote: >I had this position in a game I played tonight. Analyzing it, I found that I >missed a draw. Ruffian took 9 seconds and 14 plies, while Crafty took 4 minutes >and 22 plies to see that it was a draw (Athlon 2GHz). Ruffian gives a draw score >after two repititions, so this might be why. I'm not sure what Crafty does. > >[D]8/8/8/1p6/8/8/pq3P2/3k2KQ w - - 0 76 > >While we're on the subject, what do you programmers think is the best approach >for repetition detection? Giving a draw score after two repetitions or waiting >until three? Or are there advantages to both approaches? There is no reason to wait for 3 repetition. 3 repetitions means that the position repeats 4 times. it is certainly safe to give a draw score after 2 repetitions and for me even one repetition is enough to return a draw score. I think that at least for positions that did not happen in the history of the game one repetition is enough and I will be surprised if Crafty has different opinion(in other words if the problem is not repetition of previous position in the game that you talk about I will be surprised if Crafty does not evaluate it as a draw). Uri
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