Author: Heiner Marxen
Date: 15:16:25 09/23/04
Go up one level in this thread
On September 23, 2004 at 17:44:25, Andreas Guettinger wrote: >On September 23, 2004 at 16:58:33, Roman Hartmann wrote: > >>hello all, >> >>while testing my move generator (10x12 array, only legal moves) and comparing >>the perft result from Crafty and my own results I noticed that my results differ >>for some positions a bit. As the results start to differ only at some depth it's >>not that easy to track this bug. Although I'm quite certain that the problem is >>somehow related to EP-moves I wasn't able to solve this riddle yet. >> >>By searching the web I found some websites with perft results from other chess >>engines with numbers even more off than the results from my move generator. >> >>some results -total nodes- from my move generator (proper Results from Crafty): >>rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 >>perft 4: 20603 ok >>perft 5: 5072212 ok > >perft 5: nodes: 4865609 > >This is the starting position, right? >Your Crafty version must be broken. Most probably he sums over all depths up to the specified one, but excludes the initial position. Here is the data from Chest: dep #nodes quot sum nodes 0 1 [ 0.000] 1 1 20 [ 20.000] 21 2 400 [ 20.000] 421 3 8902 [ 22.255] 9323 4 197281 [ 22.161] 206604 5 4865609 [ 24.663] 5072213 >regards >Andy Cheers, Heiner
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