Author: Paul Richards
Date: 17:29:50 05/05/99
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On May 05, 1999 at 19:05:20, Dave Gomboc wrote: >>Strange thing though, as is so often the case, once you supply >>the correct move, it sees the continuations immediately at a much >>shallower depth. So then why the hell doesn't it see it by 15 ply? >>It really does seem as though correspondence analysis would find >>these thing faster. In other words, at 15 ply it doesn't see f5 >>as best, yet as soon as you supply f5, it sees it winning within >>10 or 11 ply. It doesn't get confused by any drawing chances >>either, it easily finds a clear win. [snip] >Pruning might be to blame. !? Actually I have to retract the comment about Fritz not getting confused by apparent draws, it does hesitate for a time due to a possible repetition situation: 1. f5 hxg5 2. f6 Qc7 3. fxg7 Kxg7 4. Nh5+ Kh8 5. Nf6 Kg7 6. Nh5+ etc. However the strange thing is that this does not happen every time I rerun the evaluation! If it spots 4. Bxg5 it will ignore 4. Nh5+ thereafter and find the winning line very easily. Other times it fixates on the 4. Nh5+ line for quite a while. It may be that it is spending a lot of time doing selective searching for lines that appear better at first, and so it takes a long time to find a better fourth move in the 1. f5 line(?). If you supply it with 1. f5 though it updates the fourth move to 4. Bxg5 in about 30 seconds and it's clear sailing from there. Perhaps drawing possibilities really cause problems with these searches, but I don't understand this stuff well enough to know why. :)
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