Author: Uri Blass
Date: 23:28:14 05/05/01
I gave Deep Fritz to analyze similiar number of nodes to Deeper blue and Deep Fritz seems to be clearly better in tactics. Deep Fritz needs only 191728 knodes to see the line Rf5+ Ke3 It means only 1 second if I asuume 200,000,000 nodes per second. I believe that Rf5+ failed low at depth 17 for Deeper blue for the reason Ke3. The pv of deeper blue at smaller depthes is Rf5+ Ke2 Deep Fritz probably does better extensions than Deeper blue because Deep Fritz see big fail low at depth 16. Deep fritz also can see another fail low for Rg8 at depth 22 when deeper blue could get only depth 17 after similiar number of nodes. I do not believe that you lose more than 2-3 plies from null move pruning(my test suggest that you do not lose even 1 ply at small depthes so I guess that Deep Fritz can search deeper because it is a better software. kasparov - Deeper blue 4r3/8/2p2PPk/1p1r4/pP2p1R1/P1B5/2P2K2/8 b - - 0 1 Analysis by Deep Fritz: 44...e3+-- = (0.19) Depth: 1/3 00:00:00 44...e3+-- 45.Ke2 ± (1.22) Depth: 1/5 00:00:00 44...Rd1! ± (1.00) Depth: 1/5 00:00:00 44...Rd1-- ± (1.37) Depth: 2/6 00:00:00 44...Rd1-- ± (1.37) Depth: 2/6 00:00:00 44...Red8! ± (1.28) Depth: 2/7 00:00:00 44...Rg8! ± (1.25) Depth: 2/8 00:00:00 44...Rg8! 45.g7 ² (0.47) Depth: 2/11 00:00:00 44...Rg8 45.g7 Rf5+ 46.Ke2 ± (0.72) Depth: 3/14 00:00:00 44...Rg8 45.g7 Rf5+ 46.Ke2 Rf3 ± (0.75) Depth: 4/12 00:00:00 2kN 44...Rg8 45.g7 Rf5+ 46.Ke2 Rf3 47.Bd2+ Kh7 ± (0.75) Depth: 5/13 00:00:00 6kN 44...Rg8-- ± (1.06) Depth: 6/14 00:00:00 14kN 44...Rg8-- 45.g7 Rh5 46.Rxe4 Rh2+ 47.Ke3 Rxc2 +- (1.53) Depth: 6/17 00:00:00 21kN 44...Rf5+! +- (1.50) Depth: 6/18 00:00:00 37kN 44...e3+! +- (1.47) Depth: 6/18 00:00:00 45kN 44...e3+! 45.Ke2 Rh5 46.g7 Rh2+ 47.Kd3 Rd8+ 48.Bd4 e2 ² (0.66) Depth: 6/18 00:00:00 53kN 44...e3+-- ± (0.97) Depth: 7/20 00:00:00 65kN 44...e3+-- 45.Ke2 Rh5 46.g7 Rh2+ 47.Kd3 Rd8+ 48.Rd4 Rxd4+ 49.Kxd4 Kh7 50.Kxe3 +- (1.47) Depth: 7/24 00:00:00 86kN 44...Rdd8! +- (1.44) Depth: 7/24 00:00:00 149kN 44...Rdd8! 45.f7 Rf8 46.Ke3 Kh5 47.Rg3 Rd6 ± (1.25) Depth: 7/24 00:00:00 157kN 44...Rdd8-- +- (1.56) Depth: 8/16 00:00:00 199kN 44...Rdd8-- 45.f7 Rf8 46.Ke3 Kh5 47.Rg2 Kh6 48.Kxe4 +- (2.56) Depth: 8/18 00:00:00 221kN 44...e3+! +- (2.53) Depth: 8/24 00:00:00 273kN 44...e3+! 45.Ke2 Rf5 46.f7 Rf2+ 47.Kd3 Rd8+ 48.Kxe3 Rxc2 +- (2.03) Depth: 8/24 00:00:00 335kN 44...Rd7! +- (2.00) Depth: 8/24 00:00:00 526kN 44...Rd7! 45.g7 e3+ 46.Kf3 Kh7 47.Rh4+ Kg6 48.Re4 Red8 49.Kxe3 +- (1.94) Depth: 8/24 00:00:00 546kN 44...Red8! +- (1.91) Depth: 8/24 00:00:01 585kN 44...Red8! 45.g7 Kh7 46.Rxe4 Rh5 47.Kg3 Kg8 48.Re7 +- (1.87) Depth: 8/24 00:00:01 602kN 44...Rg8! +- (1.84) Depth: 8/24 00:00:01 673kN 44...Kh5! +- (1.81) Depth: 8/24 00:00:01 694kN 44...Kh5-- +- (2.12) Depth: 9/22 00:00:01 805kN 44...Kh5-- 45.f7 Rf8 46.Kg3 Rdd8 47.Bg7 e3 +- (2.50) Depth: 9/22 00:00:01 890kN 44...Rg8! +- (2.47) Depth: 9/22 00:00:01 923kN 44...Rg8! 45.g7 Rf5+ 46.Ke2 Kh5 47.Rxe4 Kg6 48.Re6 c5 49.bxc5 Rxc5 +- (1.91) Depth: 9/22 00:00:01 1008kN 44...Rg8 45.g7 Rf5+ 46.Ke2 Kh5 47.Rxe4 Kg6 48.Re6 c5 49.bxc5 Rxc5 50.Kd3 +- (2.00) Depth: 10/23 00:00:02 1603kN 44...Kh5! +- (1.97) Depth: 10/27 00:00:03 2372kN 44...Kh5! 45.f7 Rf8 46.Kg3 Rdd8 47.Bg7 Rg8 48.fxg8Q +- (1.81) Depth: 10/27 00:00:03 2442kN 44...Kh5 45.f7 Rf8 46.g7 Rxf7+ 47.Ke2 Rd8 48.g8Q Rxg8 49.Rxg8 Rf3 50.Bb2 +- (1.87) Depth: 11/25 00:00:04 2876kN 44...Kh5-- +- (2.19) Depth: 12/29 00:00:06 4493kN 44...Kh5-- +- (2.19) Depth: 12/29 00:00:06 4763kN 44...Rg8! +- (2.16) Depth: 12/29 00:00:07 5348kN 44...Rg8! 45.g7 Rf5+ 46.Ke3 Rf3+ 47.Ke2 Kh7 48.Bb2 Rf5 49.Ke3 Rf1 50.Rxe4 +- (2.03) Depth: 12/29 00:00:09 6493kN 44...Rf5+! +- (2.00) Depth: 12/29 00:00:14 10023kN 44...Rf5+! 45.Ke2 Rg8 46.g7 Kh5 47.Rxe4 Kg6 48.Re6 c5 49.Re4 cxb4 +- (1.50) Depth: 12/29 00:00:15 10790kN 44...Rf5+ 45.Ke2 Rg8 46.g7 Kh5 47.Rxe4 Kg6 48.Re6 c5 49.Re4 cxb4 50.Rxb4 +- (1.50) Depth: 13/30 00:00:18 12983kN 44...Rf5+-- +- (1.81) Depth: 14/35 00:00:27 19404kN 44...Rf5+-- 45.Ke2 Rg8 46.g7 Kh5 47.Rxe4 Kg6 48.Re6 c5 49.bxc5 Rxc5 50.Kd3 +- (1.84) Depth: 14/35 00:00:50 36597kN 44...Rf5+ 45.Ke2 Rg8 46.g7 Kh5 47.Rxe4 Kg6 48.Re6 c5 49.bxc5 Rxc5 50.Kd3 +- (1.94) Depth: 15/35 00:01:19 57957kN 44...Rf5+-- +- (2.25) Depth: 16/37 00:03:15 142651kN 44...Rf5+-- 45.Ke3 Rf3+ 46.Ke2 Rg8 47.Bd2+ Kh5 48.Rg5+ Kh6 49.f7 Rd8 50.g7 +- (3.06) Depth: 16/37 00:04:21 191728kN 44...Rg8! +- (3.03) Depth: 16/37 00:04:42 206715kN 44...Rg8! 45.g7 Rf5+ 46.Ke3 Rf3+ 47.Ke2 +- (2.25) Depth: 16/37 00:06:07 267902kN 44...Rg8 45.g7 Rf5+ 46.Ke3 Rf3+ 47.Ke2 Rf5 48.Bd4 e3 49.Kxe3 +- (2.50) Depth: 17/38 00:08:43 382453kN 44...Rg8 45.g7 Rf5+ 46.Ke3 Rf3+ 47.Ke2 Rf5 +- (2.50) Depth: 18/41 00:18:37 809804kN, tb=1 44...Rg8 45.g7 Rf5+ 46.Ke3 Rf3+ 47.Ke2 Rf5 +- (2.50) Depth: 19/42 00:33:27 1472226kN, tb=6 44...Rg8 45.g7 Rf5+ 46.Ke3 Rf3+ 47.Ke2 Rf5 +- (2.50) Depth: 20/46 01:06:01 2917465kN, tb=52 44...Rg8 45.g7 Rf5+ 46.Ke3 Rf3+ 47.Ke2 Rf5 +- (2.50) Depth: 21/47 02:35:13 6867428kN, tb=222 44...Rg8-- +- (2.81) Depth: 22/46 04:16:01 11410779kN, tb=435 (Blass, Tel-Aviv 06.05.2001) Uri
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