Author: Uri Blass
Date: 03:27:17 08/31/00
Go up one level in this thread
On August 31, 2000 at 06:06:53, Graham Laight wrote: >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. > >Unfortunately, I have to disagree. > >As I remember it, immediately after the sac, Fritz scored itself as being >positive. Then, after a few moves, its eval went down to 0, and stayed there for >quite a while (Crafty was still scoring itself as quite positive - between 1 and >2 points). > >Eventually, of course, it came back up again and Fritz won the game. Here is Fritz's evaluations(from the pgn of Fritz): 19...h4 0.41 pawns for white 20...bxc5 0.03 pawns for white 21...b4 0.22 pawns for white 22...Rxb4 0.22 pawns for white 23...Qxh2 0.09 pawns for white I do not see that fritz scored itself as positive after the sac(it scored itself as slightly negative in all these moves). In moves 24,25 it scored itself as slightly positive and in moves 26-27 as slightly negative At move 28 it scored itself as sligthly positive and the advantage only increased when the evaluation at move 42 was mate in 37. Uri
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