Author: Mihaly Szalai
Date: 06:04:03 04/02/05
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On April 02, 2005 at 06:18:31, Dieter Buerssner wrote: >This time really with krpkrp. A very surprising result. Without TBs, Rg1 was >found at depth 14, with a good collection of TBs, Rg1 was only found at depth >18. It might be interesting to see, if other engines have a similar behaviour. >It is not the first time, I see my engine needing more depth with TBs. It could >just be coincidence, but I have the feeling it isn't. It should be interesting, >to investigate the real causes. Perhaps this position is a good study object >(with such a huge difference in solving depth). Unfortunately, the search tree >will be too big, to dump and investigate really carefully. Regards, > >Dieter > Thank you, Dieter for your insights. I don't have 6 man tbs and Fritz cannot handle them afaik. Fritz 8 with tbs from the Fritz 8 CD finds Rg1 at depth 14: 1.Rh1+ Kg2 2.Rh5 c5+ 3.bxc5 bxc5+ 4.Ke5 c4 5.Kf5 Kf2 6.Rh2+ Kg3 7.Rh1 c3 8.Kg6 Kg2 9.Rc1 Rc7 10.Rc2+ Kf3 ± (0.85) Depth: 14/46 00:00:11 7630kN, tb=2452 1.Rg1! ± (0.86) Depth: 14/46 00:00:21 13753kN, tb=4934 1.Rg1! ± (1.14) Depth: 15/38 00:00:26 17763kN, tb=6778 1.Rg1 c5+ 2.bxc5 bxc5+ 3.Ke5 c4 4.Kf5 Kh2 5.Rg6 Rc7 6.Rg7 Rc5+ 7.Kg4 Rc6 8.h7 ± (1.29) Depth: 16/46 00:00:45 30072kN, tb=15528 1.Rg1 c5+ 2.bxc5 bxc5+ 3.Ke5 c4 4.Kf5 Kh2 5.Rg6 Rc7 6.Rg7 Rc5+ 7.Kg4 Rc6 8.h7 Rh6 9.Rc7 Rh3 10.Re7 ± (1.29) Depth: 17/46 00:01:13 50418kN, tb=30981 (Szalai, P4 3.0 GHz 02.04.2005) Without tbs Fritz 8 finds it at depth 20: 1.Rh1+! ± (1.02) Depth: 14/35 00:00:07 8067kN 1.Rh1+! ± (1.30) Depth: 15/40 00:00:13 14612kN 1.Rh1+! +- (1.59) Depth: 15/40 00:00:16 18061kN 1.Rh1+ Kg2 2.Rh5 Kg3 3.Ke5 Kg4 4.Rh1 +- (2.11) Depth: 15/40 00:00:20 23149kN 1.Rh1+! +- (2.39) Depth: 16/41 00:00:28 32280kN 1.Rh1+ Kg2 2.Rh5 c5+ 3.bxc5 bxc5+ 4.Ke5 c4 5.Kf6 c3 6.Kg6 Rc7 7.h7 Rc6+ 8.Kf7 c2 9.Rh2+ Kxh2 10.h8Q+ Kg3 +- (2.35) Depth: 17/45 00:00:43 49370kN 1.Rh1+ Kg2 2.Rh5 c5+ 3.bxc5 bxc5+ 4.Ke5 c4 5.Kf6 c3 6.Kg6 Rc7 7.h7 Rc6+ 8.Kf7 c2 9.Rh2+ Kxh2 10.h8Q+ Kg3 +- (2.35) Depth: 18/49 00:01:07 77270kN 1.Rh1+ Kg2 2.Rh5 c5+ 3.bxc5 bxc5+ 4.Ke5 c4 5.Kf6 c3 6.Kg6 Rc7 7.h7 Rc6+ 8.Kf7 c2 9.Rh2+ Kxh2 10.h8Q+ Kg3 +- (2.35) Depth: 19/57 00:02:14 157757kN 1.Rh1+! +- (2.63) Depth: 20/59 00:05:03 359611kN 1.Rg1! +- (2.64) Depth: 20/63 00:08:58 636757kN 1.Rg1 c5+ 2.Ke5 cxb4 3.Kf5 Kh2 4.Rg6 Rf7+ 5.Kg5 b5 6.Rb6 b3 7.Rxb5 Rd7 8.Rxb3 Rd5+ 9.Kg6 +- (2.64) Depth: 21/61 00:14:19 1021806kN (Szalai, P4 3.0 GHz 02.04.2005) However it's a different story with Hiarcs 9: With tbs at depth 15: 1.Ke4 Kg2 ? (0.31) Depth: 13/31 00:00:22 5881kN, tb=11322 1.Ke4 Kg2 2.Ra6 Rxh6 3.Rxb6 Rh4+ 4.Kd3 Kf3 5.Kc3 Rh1 6.Kd4 Rc1 ? (0.48) Depth: 13/31 00:00:23 6090kN, tb=11531 1.Ke4 Kg2 2.Ra6 Rxh6 3.Rxb6 Rh4+ 4.Kd3 Kf3 5.Kc3 Rh1 6.Kb3 Rc1 ? (0.44) Depth: 14/31 00:00:27 7001kN, tb=13414 1.Rh1+ Kg2 2.Rh5 c5+ 3.bxc5 bxc5+ 4.Ke4 c4 5.Rg5+ Kh3 6.Rg1 c3 7.Kf5 Kh2 8.Rg6 Rf7+ 9.Ke4 c2 10.Rc6 Re7+ ? (0.45) Depth: 14/33 00:00:33 8665kN, tb=15687 1.Rh1+ Kg2 2.Rh5 c5+ 3.Ke5 cxb4 4.Kf5 b3 5.Kg6 Rc7 6.Rg5+ Kf2 7.Rf5+ Ke3 8.Rb5 Rc6+ 9.Kg7 Rc7+ 10.Kg8 Rc8+ ? (0.47) Depth: 14/33 00:00:35 9222kN, tb=16000 1.Rh1+ Kg2 2.Rh5 c5+ 3.Ke5 cxb4 4.Kf5 b3 5.Kg6 Rc7 6.Rg5+ Kf2 7.Rf5+ Ke3 8.Rb5 Rc6+ 9.Kg7 Rc7+ 10.Kg8 Rc8+ 11.Kf7 Rc7+ 12.Kf8 Rh7 ? (0.41) Depth: 15/34 00:00:49 13441kN, tb=23022 1.Rg1 Kh4 ? (0.42) Depth: 15/34 00:01:03 17124kN, tb=30696 1.Rg1 Kh4 ± (0.72) Depth: 15/34 00:01:11 19528kN, tb=34586 1.Rg1 Kh4 2.Ke4 Rxh6 3.Ke5 c5 4.b5 ± (0.99) Depth: 15/34 00:01:29 25784kN, tb=41514 1.Rg1 Kh4 2.Ke4 Rxh6 3.Ke5 c5 4.b5 ± (1.24) Depth: 16/38 00:02:09 38782kN, tb=62217 Without tbs at depth 14: 1.Rh1+ Kg2 2.Rh5 c5+ 3.Ke4 cxb4 4.Kf5 b3 5.Kg6 Rc7 6.Rg5+ Kf2 7.Rf5+ Ke2 8.h7 Rc6+ 9.Kg7 Rc7+ 10.Kh6 ? (0.38) Depth: 12/29 00:00:04 2164kN 1.Ke5 Kg2 ? (0.39) Depth: 12/29 00:00:06 3010kN 1.Ke5 Kg2 2.Ra2+ Kg3 3.Ra6 Rxh6 4.Rxb6 Rh4 ? (0.40) Depth: 12/29 00:00:06 3223kN 1.Ke4 Kh2 ? (0.41) Depth: 12/29 00:00:07 3729kN 1.Ke4 Kg2 2.Ra6 Rxh6 3.Rxb6 Rh4+ 4.Kd3 Kf3 5.Kc3 Rh1 6.Kd4 Rc1 7.Ra6 ? (0.44) Depth: 12/29 00:00:07 3849kN 1.Ke4 Kg2 2.Ra6 Rxh6 3.Rxb6 Rh4+ 4.Kd3 Kg3 5.Kc3 Rh1 6.Kd4 Rd1+ 7.Ke4 Rc1 ? (0.41) Depth: 13/29 00:00:09 4555kN 1.Ke4 Kg2 2.Ra6 Rxh6 3.Rxb6 Rh4+ 4.Kd3 Kf3 5.Kc3 Rh1 6.Kd4 Rd1+ 7.Kc5 Rc1+ 8.Kd6 Rc4 ? (0.39) Depth: 14/30 00:00:14 7185kN 1.Rg1 Kh4 ? (0.40) Depth: 14/32 00:00:21 10852kN 1.Rg1 Kh4 2.Ke4 Rxh6 3.Ke5 c5 4.b5 ? (0.61) Depth: 14/32 00:00:23 11662kN 1.Rg1 Kh4 2.Ke4 Rxh6 3.Ke5 c5 4.b5 c4 5.Rh1+ Kg5 6.Rxh6 Kxh6 7.Kd4 Kg5 8.Kxc4 Kf6 9.Kd4 Ke7 ? (0.61) Depth: 15/33 00:00:27 14184kN 1.Rg1 Kh4 2.Ke4 Rxh6 3.Ke5 c5 4.b5 c4 5.Rh1+ Kg5 6.Rxh6 Kxh6 7.Kd4 Kg5 8.Kxc4 Kf6 9.Kd4 Ke7 ± (0.86) Depth: 16/34 00:00:48 24254kN Best wishes Mihaly
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