Author: Robert Hyatt
Date: 07:27:25 08/30/00
Go up one level in this thread
On August 30, 2000 at 06:30:23, Alexander Kure wrote: >On August 29, 2000 at 23:19:59, Robert Hyatt wrote: > >>On August 29, 2000 at 19:18:17, Alexander Kure wrote: >> >>>On August 29, 2000 at 13:58:52, Graham Laight wrote: >>> >>>>Firstly, apologies to everyone for dashing off after the last game in the WMCCC. >>>> >>>>It enabled me to get an extra day's holiday with my girlfriend, though, which >>>>was well worthwhile! >>>> >>> >>>Well deserved, Graham! >>>Thanks again for your work. >>> >>>[...] >>> >>>This game clearly showed that Fritz plays in a different league than Crafty! In >>>fact I think this was one of the best games of the WMCCC. >>> >>>Greetings >>>Alex >> >> >>My take on this game is a bit different. I do _not_ want my program to make >>such a sacrifice and then see the eval steadily go _down_ over the next few >>moves. It means one of two things for it to win such a game: >> >>1. The eval is bogus. It is saying "this is bad" when in reality "this is >>good". I don't want that sort of evaluation. >> >>2. The program was lucky. A little luck doesn't hurt. But it doesn't win >>tournaments very often. >> >>Either the eval was wrong, or it was lucky. Neither one leave me feeling like >>"fritz is in a different league than Crafty..." >> >>I suspect white has better moves that might have justified the pessimistic eval >>Fritz had... The right program might have made that sacrifice look as ugly as >>this game made it look brilliant... > >Hi Bob, > >When Graham said that Fritz's evaluation was steadily going down he meant that >it was steadily increasing on the negative score thus going up for Fritz, as >Fritz had black and the evaluation is always shown from white's point of view. > >Greetings >Alex I understood. In his output fritz has a "+" eval (good for white I assumed) for a few moves. But in any case, I am convinced that the sac is no good. I believe white can win that mess after Nxe6, but even if he doesn't I would rather play white there. White has some dangerous threats along the way, which is why Bh3 works pretty well (e5 is also dangerous but the queen has to stay on the diagonal it is on to avoid an instant mate.) I am now pretty sure that Crafty could not have found Ne6 in time, however, as it takes me a deep search to find this move, although I can't say how the parallel search helps/hurts the total time required. It still looks like an act of desparation as Crafty's evaluation was pretty high through this part of the game before h4 was played. It turned out fine, of course, but I think it could have backfired easily. I have special code in Crafty to avoid this kind of sacrifice, unless it can tactically see material gain. Almost every time Crafty has tossed a piece for two pawns, it has lost. This is in my "bad trade" code in the eval, btw..
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