Author: Uri Blass
Date: 13:32:57 11/09/00
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On November 09, 2000 at 12:49:07, Bruce Moreland wrote: >On November 09, 2000 at 11:01:59, Thorsten Czub wrote: > >>Here another really nice and lucky game of Gambit-Tiger versus Crafty17.13. >> >>if you want we can post the different scores too. its funny. >>most often gambit-tiger said +3.0 and crafty was 0.3x down ! >> >>you can see very good in this example how gambit-tiger tries and tries to >>attack, >>how it betrays crafty. > >In this game, Tiger was white and had an attacking setup. Crafty got pretty >passive and Tiger was very aggressive. Crafty didn't do anything particularly >stupid to get into this situation, I can imagine any program having problems in >that position. You can't blame someone for playing black and getting >king-attacked in a Sicilian. But Tiger could not break through. Crafty >defended well and counterattacked. The balance shifted to neutral around the >time Crafty played ... d4. > >This isn't about inaccuracy or accuracy or anything else. It's about being >aggressive and kicking heads. Tiger played very aggressively and turned all of >its units into attacking units. I think Crafty's evaluation was low. But the >fact remains that Tiger's evaluation was not borne out, the attack couldn't >overwhelm a point in Crafty's position. > >For those expecting to see a sacrificial attack here, it didn't happen. (By the >way, in another post, I said Tiger had not made any long-term sacrifices, and I >was talking about in my games, not in the game where it played Rc6, which is an >obvious long-term sacrifice.) > >>then suddenly the king attack gets lost, but the endgame takes over. >>this was very risky, and only due to craftys good defense... and some >>luck, it was possible. > >It was BN vs R and two more pawns. Tiger made a very obvious exchange sacrifce. > I don't know why Crafty didn't see it. Mine thinks the game is about even >prior to the sacrifice, and it takes it 2.7 seconds to get a score of in excess >of +1 on that sacrifice, and it's a good +1, I think it knows what is going on. >I think that anything could find that. Crafty17.13 at the end of iteration 15 still likes Ne8 but expect the right move Rxc6 with a small advantage for white. I did not use tablebases but I believe that they cannot change the score because I see no tablebase positions in the relevant lines. The score at depth 16 is more optimistic for white and is 0.54 pawns for white and there is a good chance that crafty is going to change its mind at depth 16 but it is too late for 60/60 game even if crafty use hardware of 2 gh. I think that the problem here may be a different evaluation of crafty and another problem is that crafty does not consider Rxc6 for enough time(it is a known problem of chess programs that they do not consider for a long time moves that simplify the position). Uri
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