Author: John Merlino
Date: 08:30:09 03/31/05
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On March 31, 2005 at 11:21:10, Mihaly Szalai wrote: >I think this is a very good engine test. >Try to avoid Rh1+ (leads to a draw) and find Rg1! > >J. Fleck - Ch. Lutz > >[D]8/7r/1pp4P/8/1P1K4/7k/8/R7 w - - 0 1 > >1. Rg1! (1. Rh1+? Kg2 2. Rh5 c5+ 3. bxc5 bxc5+ 4. Ke5 Kf3 5. Kf6 Ke3=) 1... c5+ >( >1... Kh4 2. Ke4 Rxh6 3. Ke5 c5 4. b5 c4 5. Rh1+ Kg5 6. Rxh6 Kxh6 7. Kd4+-) 2. >bxc5 bxc5+ 3. Ke5 c4 4. Kf5 Kh2 5. Rg6 Rc7 6. Rg7 Rc5+ 7. Kg4 c3 8. h7 Rc4+ 9. >Kg5 Rc5+ 10. Kh6 c2 11. h8=Q c1=Q+ 12. Kg6+ Kg3 13. Kf6++- CMX Yoda v25 needs 4:14 on a P4-2.4 to find the move -- note that this is without tablebases: Time Depth Score Positions Moves 0:00 2/6 0.72 36895 1.Rh1+ Kg4 2.Ke5 Kg5 3.Kd6 c5 4.bxc5 bxc5 0:00 3/7 1.06 51949 1.Rh1+ Kg4 2.Ke5 c5 3.bxc5 bxc5 4.Kf6 c4 5.Kg6 0:00 3/8 1.11 82942 1.Rh1+ Kg4 2.Ke5 c5 3.Kf6 cxb4 4.Kg6 Rh8 5.h7 0:00 3/9 1.27 142575 1.Rh1+ Kg4 2.Ke5 c5 3.bxc5 bxc5 4.Kf6 c4 5.Kg6 Rh8 6.h7 0:01 4/10 1.31 303938 1.Rh1+ Kg4 2.Ke5 c5 3.bxc5 bxc5 4.Kf6 c4 5.Kg6 Rh8 6.h7 c3 0:04 5/11 0.74 1216268 1.Rh1+ Kg2 2.Rh5 c5+ 3.Ke5 cxb4 4.Kf5 b3 5.Kg6 Re7 6.Rb5 Re6+ 7.Kh7 Re7+ 8.Kg8 0:07 6/12 0.52 2327113 1.Rh1+ Kg2 2.Rh5 c5+ 3.Ke5 cxb4 4.Kf5 b3 5.Kg6 Rc7 6.Rb5 Rc6+ 7.Kh7 Rc7+ 8.Kg8 Rc8+ 9.Kg7 0:12 7/13 0.62 4333873 1.Rh1+ Kg2 2.Rh5 c5+ 3.Ke5 cxb4 4.Kf5 b3 5.Kg6 Rc7 6.h7 Rc6+ 7.Kg7 Rc7+ 8.Kg8 Rc8+ 9.Kf7 Rc7+ 10.Kf6 b2 11.Rh2+ Kf3 0:26 8/14 0.35 9531005 1.Rh1+ Kg2 2.Rh5 c5+ 3.Ke5 cxb4 4.Kf5 b3 5.Kg6 Rc7 6.h7 Rc6+ 7.Kg7 Rc7+ 8.Kg8 Rc8+ 9.Kf7 Rc7+ 10.Kf6 b2 11.Rh2+ Kf3 12.Rh3+ Ke4 1:07 9/15 0.43 24459308 1.Rh1+ Kg2 2.Rh5 c5+ 3.bxc5 bxc5+ 4.Ke5 c4 5.Kf5 c3 6.Kg6 Rc7 7.h7 Rc6+ 8.Kf7 Rc7+ 9.Ke6 c2 10.h8=Q c1=Q 11.Rh2+ Kf3 12.Qf6+ Ke4 13.Qe5+ Kd3 2:05 10/16 0.90 46440459 1.Rh1+ Kg2 2.Rh5 c5+ 3.bxc5 bxc5+ 4.Ke4 c4 5.Kf5 Kf3 6.Rh3+ Kg2 7.Rh4 c3 8.Kg6 Ra7 9.h7 Ra6+ 10.Kf5 Ra5+ 11.Kf6 Ra6+ 12.Ke5 Ra5+ 13.Ke6 Ra6+ 14.Kf7 4:14 10/16 1.20 93524096 1.Rg1 c5+ 2.Ke4 cxb4 3.Kf5 Kh2 4.Rg6 b5 5.Rb6 Rh8 6.Kg6 Rg8+ 7.Kf6 Rh8 8.Kg7 Rd8 9.Rxb5 Rd7+ 10.Kg8 jm
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