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Subject: Repetition detection test position

Author: Russell Reagan

Date: 22:21:16 11/27/03


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?



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