Author: Robert Hyatt
Date: 08:17:52 02/09/00
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On February 09, 2000 at 00:31:28, Peter W. Gillgasch wrote: >On February 08, 2000 at 23:57:54, Robert Hyatt wrote: > >>It doesn't appear to be a bug.. just that on the fail high, some mates that >>were pruned suddenly become "ok". And move ordering just happens to follow >>an incredibly deep series of checks first. IE it finds a mate in 15 or so >>very quickly then tries to improve. But in doing so, it searches a _bunch_ >>of stuff. Just runaway extensions, mainly. > >OK. It is not a bug. Let´s call it a f* up then 8^) > >In any case you should look into this for obvious reasons... > >-- Peter I did... there is nothing I can do. Crafty just _happens_ to pick the wrong check to look at first, and it follows a line that leads to a forced mate in 15 moves, but it takes a while to find this. Then it tries other moves and finds shorter mates after burning a lot of time. Without beta=+inf, the deep mate gets pruned instantly, hence the fail high at 1 second. It then takes almost 2 minutes to get a score back. Sometimes move ordering is simply unlucky, other times I get a mate instantly while others take a long while...
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