Author: Gian-Carlo Pascutto
Date: 03:37:57 09/10/01
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On September 09, 2001 at 21:05:23, Dave Gomboc wrote: >Is this a won position for Black? DJ6 doesn't seem to think so, but it might >just be wrong... Cray Blitz - Deep Thought II [D]4k3/7R/3p2p1/4bpB1/8/3R2PK/r6P/r7 b - - 0 1 Analysis by Crafty 18.08: 49...Rb1 50.Rd2 Rxd2 51.Bxd2 Rb3 52.Bg5 f4 53.Re7+ Kf8 54.Re6 f3 55.Rxg6 Kf7 56.Rh6 f2 57.Kg2 Rb2 -+ (-2.06) depth: 14/31 00:02:11 84431kN, tb=113 49...Rb1 50.Rd2 Rxd2 51.Bxd2 Rb3 52.Bg5 f4 53.Re7+ Kf8 54.Re6 f3 55.Rxg6 Rb1 56.Be3 Kf7 57.Rh6 Rb2 -+ (-1.89) depth: 15/35 00:02:44 105884kN, tb=245 49...Rb1 50.Rd2 Rxd2 51.Bxd2 Rb3 52.Bg5 f4 53.Re7+ Kf8 54.Re6 f3 55.Rxg6 Kf7 56.Rh6 f2 57.Kg2 Rb2 58.Be3 Kg7 -+ (-2.00) depth: 16/37 00:05:46 217826kN, tb=1256 49...Rb1 50.Rd2 Rxd2 51.Bxd2 Rb3 52.Bg5 f4 53.Re7+ Kf8 54.Re6 f3 55.Rxg6 Kf7 56.Rh6 Rb2 57.Rh4 d5 58.Rh7+ Ke6 59.Re7+ Kf5 -+ (-2.14) depth: 17/39 00:11:33 428732kN, tb=4302 49...Rb1 50.Rd2 Rxd2 51.Bxd2 Rb3 52.Rh4 Kf7 53.Bg5 Ke6 54.Rc4 Kd5 55.Rh4 Kc5 56.Ra4 Rb2 57.Be3+ Kb5 58.Ra8 Kc4 59.Rd8 -+ (-2.29) depth: 18/41 00:31:10 1133497kN, tb=15025 I tend to prefer Crafty over Hiarcs in endgames, but I have no idea whose assesement is better here. But note that Crafty is already heavy in the tablebases here, and the score is going up for black... Hiarcs is around -1.55 in all these positions, but doesn't hit tablebases yet. >Back to 47.Kg1 Ra1+ 48.Kf2 R6a2+ 49.Rd2 Bf6 50.Bh6 g5 Instead of 50. .. g5, 50. .. d5! and I get -2.26 in favor of black. >I suspect that 46.Re7+ Kf8 47.Rb3 Ra8 48.Rxh7 Rxa2 49.g3 is about the same. Hiarcs d5 with -1.9, Crafty -2.2 >42.Bh6 Bg7 43.Bxg7 Kxg7 might just be a draw, though. Hmm, 42...Rcxa4, I guess, then it's similar to before. Yes >I don't know, GCP, I don't think these pawn up endings deserve +2.25. But in >order for DT2 to settle on that kind of score, if it got to these variations it >must have assessed them as such. Crafty obviously disagrees with you, as does Hiarcs in some of the positions (although its score is usually more around -1.6, it drops down the lines). The question is of course whose assesement is more correct. I do think this shows that DT's assesement wasn't bogus or due to a bug. But perhaps we need to relax the requirement for the starting position a bit and require that c5 is found within 7 seconds with a score lesser than 2.x. -- GCP
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