Author: Mihaly Szalai
Date: 13:45:25 12/15/03
Go up one level in this thread
On December 15, 2003 at 16:23:15, Dieter Buerssner wrote: >[D] 5k2/1R4p1/5p2/4p2p/1p2P2P/r4P2/PK4P1/8 b - - > >This is from a game between Ruffian-Yace in the "CSS-Online-Masters" (time >control 60 15). > >I think, after Ra4, white cannot make progress, and the game will end in draw. >Yace played Re3? instead (with 0.0 score). Are there engines, that show in >reasonable time a big score difference between Re3 and Ra4?. I believe Re3 loses >by force. For example Re3 Rxb4 Re2 Kb3 Rxg2?! (possibly Re3 instead gives more >resistance) a4. > >It is not a real good test position, because engines can show for a long time >the same score for Ra4 and Re3, and the chosen move might be pure luck. >Therefore also the question for scores after those moves. > >Regards, >Dieter Junior chooses Ra4. 5k2/1R4p1/5p2/4p2p/1p2P2P/r4P2/PK4P1/8 b - - 0 1 Analysis by Junior 8 (Celeron 1.7 GHz 64 MB hash): 1...b3 2.Kxa3 bxa2 3.Kxa2 +- (6.95) Depth: 3 00:00:00 1...Ra4 2.g4 hxg4 3.fxg4 g5 ? (0.65) Depth: 6 00:00:00 2kN 1...Ra4 2.g4 hxg4 3.fxg4 g5 ? (0.65) Depth: 6 00:00:00 2kN 1...Ra4 2.g4 hxg4 3.fxg4 g5 ? (0.65) Depth: 6 00:00:00 2kN 1...Ra4 2.g4 hxg4 3.fxg4 g5 ? (0.65) Depth: 6 00:00:00 2kN 1...Ra4 2.g4 hxg4 3.fxg4 g6 4.g5 f5 5.Kb3 ? (0.62) Depth: 9 00:00:00 26kN 1...Rd3 2.Rxb4 Rd2+ 3.Kb3 Rxg2 4.Rb8+ Kf7 5.Rb7+ Ke6 6.a4 g5 7.hxg5 ? (0.45) Depth: 9 00:00:00 74kN 1...Rd3 2.Rxb4 ± (0.75) Depth: 12 00:00:00 552kN 1...Ra4 2.Rc7 g6 3.Rd7 Ke8 4.Rb7 g5 5.hxg5 ? (0.49) Depth: 12 00:00:00 804kN 1...Ra4 2.Rc7 g6 3.Rd7 Ke8 4.Rb7 Kd8 5.Kb3 Ra3+ 6.Kxb4 Rxa2 7.g4 ? (0.42) Depth: 15 00:00:02 2552kN 1...Re3 2.Rxb4 Re2+ 3.Kb3 Rxg2 4.a4 ? (0.31) Depth: 15 00:00:07 6747kN 1...Re3 2.Rxb4 Re2+ 3.Kb3 Rxg2 4.a4 Rg3 5.a5 Rxf3+ 6.Ka4 Rf1 7.a6 Ra1+ 8.Kb5 Ke8 9.Kb6 g5 10.hxg5 fxg5 ? (0.55) Depth: 17 00:00:23 21119kN, tb=50 1...Ra4 2.Rc7 Ra3 3.Rc4 Rd3 4.Rxb4 Rd2+ ? (0.42) Depth: 17 00:00:28 25965kN, tb=52 1...Ra4 2.Rc7 Ra3 3.Rc4 Ra4 4.Rc8+ Kf7 5.Rc7+ Kg8 6.Rc2 Ra3 7.Rc4 Ra4 8.Rc7 Ra8 ? (0.51) Depth: 19 00:00:47 41524kN, tb=70 1...Ra4 2.Rc7 Kg8 3.Rc2 Ra3 4.Rc4 Ra4 5.Rc7 Ra3 6.Rb7 Re3 ? (0.41) Depth: 21 00:02:38 133527kN, tb=468 After forcing Re3 Junior shows this: New game 5k2/1R4p1/5p2/4p2p/1p2P2P/4rP2/PK4P1/8 w - - 0 1 Analysis by Junior 8: 2.f4 Rxe4 l (-0.52) Depth: 3 00:00:00 2.g4 hxg4 3.fxg4 l (-0.39) Depth: 3 00:00:00 2.Rxb4 Re2+ ? (0.49) Depth: 3 00:00:00 2.Rxb4 Re2+ ? (0.49) Depth: 6 00:00:00 2.Rxb4 Re2+ 3.Kb3 ? (0.49) Depth: 9 00:00:00 9kN 2.Rxb4 Re2+ 3.Kb3 Rxg2 4.a4 ? (0.31) Depth: 12 00:00:00 176kN 2.Rxb4 Re2+ 3.Kb3 Rxg2 4.a4 Rg3 5.a5 Rxf3+ 6.Ka4 Rf1 7.Rb8+ Ke7 8.Rb7+ Kd6 9.Rxg7 Rf4 10.a6 Rxh4 ? (0.31) Depth: 15 00:00:04 3884kN, tb=39 2.Rxb4! ? (0.61) Depth: 18 00:00:43 41883kN, tb=81 2.Rxb4 Re2+ 3.Kb3 Rxg2 4.a4 Rg3 5.a5 Rxf3+ 6.Ka4 Rf1 7.a6 Ra1+ 8.Kb5 g5 9.Ra4 Rb1+ 10.Ka5 Rb8 11.hxg5 ± (1.07) Depth: 18 00:01:59 113895kN, tb=153 2.Rxb4 Re2+ 3.Kb3 Re3+ 4.Kc4 Ra3 5.Rb2 Ra8 6.g4 hxg4 7.fxg4 Ra4+ 8.Kd5 Kf7 9.Rd2 Ra8 10.Kc5 Rc8+ 11.Kb4 ± (1.15) Depth: 19 00:03:44 209749kN, tb=358 Mihaly
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.