Author: K. Burcham
Date: 08:29:08 03/13/02
After reading Slater's post with crafty analysis on Nolot 6, I was curious about Deep Shredder6 and Fritz7 in this position. I know most here are very familiar with the Nolot test positions. If you are not familiar with the Nolot positions, there are various sources on the internet showing lots of info on these positions. Here is a good one. http://www.seanet.com/~brucemo/nolot/nolot.htm Nolot 6 is one that has not been solved. When I played through the line, it is easy to see why programs cannot show + eval for black. After making the first move in the line, axb5, Deep Shredder6 and Fritz7, cannot see the winning line that leads to the Bf5 move. Interesting comment: by Feng-Hsiung Hsu "It probably would tie down the machine for a few days to find axb5. Perhaps we will try it sometime later". If Hsu thinks it would take Deep Blue several days to find axb5, then I do not expect any of todays programs to find this move with default settings and position learning cleared. The game moves were 1...axb5 2.Qxa8 Bd4 3.Nxd4 cxd4 4.Qxb8 0-0 5.Ke1 Qh4+ 6.g3 Qf6 7.Bf4 when black could win the game by 7...Bf5 Deep Shredder6 Paderborn 2x1533 mhz 512 hash 84.735.221.779 nodes 19.01 746:18 -0.64 1...Bd7 2.h3 Bd4 3.Nfxd4 cxd4 4.hxg4 Qb6 5.g5 Ra7 6.Qa5 Qxa5 7.Nd6+ Ke7 8.bxa5 Kxd6 9.Bd2 (21.009.792.988) 469.1 19.02 866:49 -0.63++ 1...Nd7 2.Nd6+ Kf8 3.h3 Nb6 4.Qe8+ Qxe8 5.Nxe8 Kxe8 6.hxg4 Bd4 7.Nxd4 cxd4 8.Kf3 f6 9.Be2 Na4 10.Bd2 b6 11.Rhf1 Bd7 12.Rad1 (24.324.734.715) 467.6 19.02 1117:34 -0.37 1...Nd7 2.Nd6+ Kf8 3.h3 Nb6 4.Nxb7 Bxb7 5.Qb3 Bd4 6.Nxd4 Nf6 7.Nf5 Nxe4 8.Qe3 Nxd5 9.cxd5 Qxd5 (31.242.250.001) 465.9 20.01 2442:56 -0.60 1...Nd7 2.h3 Nb6 3.Nc7+ Ke7 4.Qb3 Qxc7 5.hxg4 Bd4 6.Nxd4 exd4 7.bxc5 Qxc5 8.Kd3 Nd7 9.Bf4 Qa5 10.Kxd4 Qc5+ 11.Kd3 Qf2 12.Be3 Ne5+ 13.Kd4 (68.187.263.665) 465.1 best move: Nb8-d7 time: 3000:30.954 min n/s: 470.670 CPU 199.9% nodes: 84.735.221.779 [D] Qnbqk2r/1p3ppp/8/1ppPp3/1PP1P1n1/P4N2/4KbPP/R1B2B1R b - - 0 1 In this position Fritz7 would not play the third move of Bd4 after 42 hours at depth 19/56. After 33 hours,with the eval still at +2.00, Fritz does not see that white is in trouble with it's Queen and King's position compromised. Fritz 7: 1000 mhz 2...Qc7 3.Ra2 Bd4 4.Nxd4 exd4 5.bxc5 Nxh2 6.Rxh2 Qxh2 7.d6 Qh5+ 8.Kf2 +- (2.12) Depth: 17/53 04:30:17 7453634kN 2...Na6! +- (2.09) Depth: 17/53 05:44:59 9545803kN 2...Na6! +- (1.94) Depth: 17/53 06:37:58 11033614kN 2...Na6 3.cxb5 Nc7 4.Qa5 b6 5.Qxb6 cxb4 6.Qa5 Qd6 7.Qxb4 Bc5 +- (1.84) Depth: 17/53 07:38:22 12723411kN 2...Na6 3.cxb5 Nc7 4.Qa5 b6 5.Qxb6 cxb4 6.Qa5 Qd6 7.Bb2 Bc5 +- (1.97) Depth: 18/57 11:29:58 19187812kN 2...Na6 3.cxb5 Nc7 4.Qa5 b6 5.Qxb6 cxb4 6.Qa5 Qd6 7.h3 Bb6 +- (1.97) Depth: 19/56 33:41:22 56655384kN [D] Qnbqk2r/1p3ppp/8/1ppPp3/1PPbP1n1/P4N2/4K1PP/R1B2B1R w - - 0 1 Fritz 7: 3.Nxd4 cxd4 4.Qxb8 bxc4 5.Ke1 d3 6.Bg5 f6 +- (3.63) Depth: 7/28 00:00:00 196kN 3.Nxd4 cxd4 4.Qxb8 bxc4 5.Ke1 c3 6.Be2 Kf8 7.Bxg4 Qh4+ 8.Kf1 +- (3.84) Depth: 8/33 00:00:01 536kN 3.Nxd4 cxd4 4.Qxb8 bxc4 5.Ke1 d3 6.Bd2 Kf8 7.Rc1 Qh4+ 8.g3 +- (3.69) Depth: 9/32 00:00:03 1389kN 3.Nxd4 cxd4 4.Qxb8 bxc4 5.Ke1 c3 +- (3.81) Depth: 10/36 00:00:08 3462kN 3.Nxd4 cxd4 4.Qxb8 d3+ 5.Ke1 bxc4 6.Bd2 Kd7 7.Qa7 Qh4+ 8.g3 Qf6 +- (3.97) Depth: 11/40 00:00:25 9947kN 3.Nxd4 cxd4 4.Qxb8 d3+ 5.Ke1 bxc4 6.Bd2 +- (4.03) Depth: 12/43 00:01:09 29053kN 3.Nxd4 cxd4 4.Qxb8 bxc4 5.Ke1 d3 6.Bg5 f6 7.Bd2 +- (4.19) Depth: 13/44 00:03:25 90163kN 3.Nxd4 cxd4 4.Qxb8 bxc4 5.Ke1 d3 6.Bg5 f6 7.Bd2 +- (4.19) Depth: 14/45 00:09:04 242088kN kburcham
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