Author: Robert Hyatt
Date: 15:07:35 07/13/02
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On July 13, 2002 at 12:32:39, Richard Bean wrote: >On July 13, 2002 at 10:30:28, Robert Hyatt wrote: > >>>6 119060324 9417681 >>>The reason I differ from Steven Edwards for the number >>>of unique nodes at ply 6 is that after the moves >>>1. f4 e6/e5 2. Kf2 Qf6 3. f5 g5, no ep capture is possible, >>>so I get 2 less unique nodes than him. >>> >> >>This is _supposed_ to be _legal_ moves only. I don't therefore see >>why Steven would be counting an EP move that can't be made... > >I'm counting unique nodes at ply 6 - you can look >at http://www.it.ro/ccc_search/ccc.php?art_id=147499 >and check that Andreas Stabel got 2 less nodes when he counted positions as >unique only if ep captures were legal. > >What I'm really saying is: consider the positions after the moves > >1. f4 e6 2. Kf2 Qf6 3. f5 g5 - a >1. f4 g5 2. Kf2 e6 3. f5 Qf6 - b >1. f4 e5 2. Kf2 Qf6 3. f5 g5 - c >1. f4 g5 2. Kf2 e5 3. f5 Qf6 - d > >I think Steven Edwards has counted this as four unique positions whereas >I only count it as two, because 4. fxg6 is illegal in a and c and >impossible in b and d. OK.. first my "perft" implementation doesn't count "positions". It simply counts each time a valid move is "made". So I don't have the problem you are describing, because I don't try to compare the positions to see if they are equal. IE transpositions don't affect my counts at all...
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