Author: Brian Katz
Date: 21:57:04 12/15/03
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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 Hello, I entered this position on my computer Here is some Fritz 8 analysis of this position after forcing Black to play ...Re3: Playing ...Rd3 yields the same analysis. ...Ra4 is drawn but with ..Re3 Fritz 8 finds White to be winning. For fun, I first let Fritz 8 play a 5 minute shootout after forcing..Re3 Fritz 8 version 8.0.0.23 Run on an Athlon XP 2600+ 1 Gig DDR SDRAM Hash Tables set at 768 MB Shootout (Fritz8, Blitz:5') 1...Re3 2.Rxb4 Re2+ 3.Kb3 Rxg2 4.a4 Rf2 5.a5 Rxf3+ 6.Ka4 Rf1 7.a6 Ra1+ 8.Kb5 Kf7 9.Ra4 Rb1+ 10.Ka5 Rb8 11.a7 Ra8 12.Kb6 g5 13.Kb7 Rd8 14.a8Q Rxa8 15.Rxa8 Kg6 16.hxg5 Kxg5 17.Kc6 Kg4 18.Rg8+ Kh3 19.Kd7 h4 20.Ke6 Kh2 21.Kxf6 h3 22.Kxe5 Kh1 23.Rh8 Kg2 24.Kf4 h2 25.e5 h1Q 26.Rxh1 Kxh1 27.e6 Kg1 28.e7 Kf1 29.Ke3 Kg1 30.Kf3 Kh1 31.e8Q Kg1 32.Qg6+ Kf1 33.Qb1# 1–0 Katz,B - Fritz 8 5k2/1R4p1/5p2/4p2p/1p2P2P/4rP2/PK4P1/8 w - - 0 1 Analysis by Fritz 8: 2.Rxb4 Re2+ 3.Kb3 Rxg2 4.a4 Rg3 5.Rb8+ Kf7 6.Rb7+ Kg6 ² (0.31) Depth: 7/18 00:00:00 38kN 2.Rxb4 Re2+ 3.Kb3 Rxg2 4.a4 Rg3 5.Rb8+ Kf7 6.Rb7+ Kg6 ² (0.31) Depth: 8/22 00:00:00 66kN 2.Rxb4 Re2+ 3.Kb3 Rxg2 4.a4 g5 5.Rb6 gxh4 6.Rxf6+ Ke7 7.Rh6 = (0.09) Depth: 9/22 00:00:00 138kN 2.Rb8+! = (0.13) Depth: 9/22 00:00:00 192kN 2.Rb8+ Kf7 3.Rxb4 Re2+ 4.Kb3 Rxg2 5.a4 g5 6.a5 gxh4 7.Ra4 = (0.22) Depth: 9/22 00:00:00 253kN 2.Rb8+ Kf7 3.Rb7+ Kf8 = (0.00) Depth: 10/25 00:00:00 437kN 2.Rb8+ Kf7 3.Rb7+ Kf8 = (0.00) Depth: 11/26 00:00:01 1027kN 2.Rb8+ Kf7 3.Rb7+ Kf8 = (0.00) Depth: 12/28 00:00:02 1958kN 2.Rxb4! = (0.03) Depth: 12/28 00:00:02 2270kN 2.Rxb4 Re2+ 3.Kb3 Rxg2 4.a4 Rg3 5.a5 Rxf3+ 6.Ka4 g5 7.a6 Rf1 8.Rb7 Ra1+ 9.Kb5 gxh4 = (0.09) Depth: 12/28 00:00:02 2639kN 2.Rxb4 Re2+ 3.Kb3 Rxg2 4.a4 Rg3 5.a5 Rxf3+ 6.Kb2 Rf2+ 7.Kb3 Rf3+ = (0.00) Depth: 13/36 00:00:04 4703kN 2.Rxb4! ² (0.28) Depth: 14/37 00:00:18 18915kN 2.Rxb4 Re2+ 3.Ka1 Rxg2 4.a4 Rd2 5.a5 Rd8 6.a6 Ra8 7.Rb6 Ke8 8.Kb2 g5 9.Kc3 gxh4 ² (0.31) Depth: 14/37 00:00:20 21106kN 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.Kc6 Rb8 11.Ra3 Ra8 ² (0.53) Depth: 15/38 00:00:41 42060kN, tb=11 2.Rxb4 Re2+ 3.Kb3 Rxg2 4.a4 Rg3 5.a5 Rxf3+ 6.Ka4 Rf1 7.a6 g5 8.Ka5 Ra1+ 9.Ra4 Rd1 10.Kb6 Rd8 11.Kb7 Rd7+ ± (0.78) Depth: 16/43 00:01:12 71648kN, tb=14 2.Rxb4 Re2+ 3.Kb3 Rxg2 4.a4 Rg3 5.a5 Rxf3+ 6.Ka4 Rf1 7.a6 Ke7 8.Kb5 Rc1 9.Ra4 ± (0.91) Depth: 17/49 00:02:04 125504kN, tb=44 2.Rxb4 Re2+ 3.Kb3 Re3+ 4.Kc4 Ra3 5.Rb2 Ra8 6.g3 Ke7 7.Rb7+ Ke6 8.Kb3 Rd8 9.Kc2 Ra8 10.Kb2 g5 11.Rb6+ Ke7 ± (1.13) Depth: 18/48 00:04:02 245761kN, tb=108 2.Rxb4 Re2+ 3.Kb3 Rxg2 4.a4 Rg3 5.a5 Rxf3+ 6.Ka4 Rf2 7.a6 Ra2+ 8.Kb5 Kf7 9.Kb6 g5 10.a7 gxh4 11.Kb7 h3 ± (0.97) Depth: 19/53 00:06:46 418069kN, tb=428 2.Rxb4 Re2+ 3.Kb3 Re3+ 4.Kc4 Ra3 5.Rb2 Ra8 6.g3 Ra3 7.Rf2 Ra8 8.Kb4 Rb8+ 9.Kc5 Ra8 10.Rd2 Ke7 11.Kb4 Rb8+ ± (1.13) Depth: 20/56 00:15:09 922524kN, tb=1840 2.Rxb4 Re2+ 3.Kb3 Re3+ 4.Kc4 Ra3 5.Rb2 Ra8 6.g3 Ra3 7.Rf2 Ra8 8.Kb4 Rb8+ 9.Kc5 Ra8 10.Rd2 Ke7 11.Kb4 Rb8+ ± (1.13) Depth: 21/59 00:28:44 1755461kN, tb=6722 (Katz, Mytown 16.12.2003) Brian
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