Author: Uri Blass
Date: 02:50:24 02/10/02
Go up one level in this thread
On February 09, 2002 at 23:13:30, K. Burcham wrote: >This turned out to be a very difficult test position. >Deep Shredder6 in over 22 hours on 3100 mhz will not play Nxf2. >Chess Tiger 14.0 1000mhz in over 21 hours will not play Nxf2. >Fritz7 1507 mhz in over 20 hours will not play Nxf2. > >if i make the first move Nxf2, then Deep Shredder6 will make the next move in >this line Nxf2 Kxf2 Bh4 g3 f4. and will play each move in this line. so Deep >Shredder6 agrees with this line. > >So with this line, it seems the depth is about 10 until Shredder6 sees the line >is winning for black. Nxf2 Kxf2 Bh4 g3 f4 4.Kg2 fxg3 5.hxg3 Bxg3 6.Rh1 >Bh4 7.Nf1 Qf6 8.Bxh7+ Kh8 9.Bd3 Rae8 10.Kg1 Be2 11.Bf5 (224.630.445) 575.2 >13.01 6:30 -0.85 (did i count right here) but with 20 hours at depth 19 >Deep Shredder6 will not play Nxf2. > > >[D] r2q1rk1/ppp1b1pp/2n5/3p1p2/3Pn1b1/2PB4/PPQN1PPP/RNB1R1K1 b - - 0 1 > >black won by Nxf2 Kxf2 Bh4+ g3 f4 >I will try to give a more detailed analysis of this position but I remember that >black can win it against every defence of white >It is difficult even after f4 for programs to see that white is losing and >Junior5 after some hours in the position after f4 evaluates the position as 0.19 >pawns advantage for white. > >Uri > > >Shredder 6: 2x1533mhz 512 hash > 16.01 34:23 +0.31 1...Bd6 2.Nf1 Qh4 3.Na3 a6 4.h3 Bh5 5.Be3 f4 6.Bc1 Bxa3 >7.bxa3 Bg6 8.Nh2 (965.481.550) 467.9 > 17.01 111:09 +0.54 1...Bd6 2.Nf1 Qh4 3.Na3 a6 4.Re3 f4 5.Bxe4 fxe3 6.Bxd5+ >Kh8 7.Bxe3 Rad8 8.Bxc6 bxc6 (3.178.285.525) 476.5 > 18.01 421:46 +0.76 1...Bd6 2.Nf1 Qh4 3.b3 Rf6 4.Ng3 Kh8 5.a3 Rff8 6.a4 Rae8 >7.Bxe4 fxe4 8.Ba3 Be7 (12.249.550.309) 484.0 > 19.01 1226:56 +0.89 1...Bd6 2.Nf1 Qh4 3.a4 Kh8 4.b3 Rf6 5.Ng3 g5 6.Re3 Rh6 >7.h3 Bf4 8.Re1 Bxh3 (36.663.667.488) 498.0 >best move: Be7-d6 time: 1372:22.985 min n/s: 511.653 CPU 199.9% nodes: >42.131.054.127 depth 19 > >Chess Tiger 14.0 1000mhz 192 hash >02:01:10.8 -0.12 18 1727643107 Bd6 Nf1 Qh4 Na3 a6 Re3 Nf6 Re6 f4 Rxd6 cxd6 Bxf4 >Rad8 Re1 Bf5 Bxf5 Qxf4 Be6+ Kh8 >09:41:35.9 0.16 19 40158732 Bd6 Nf1 Qh4 Na3 a6 Re3 Nf6 Bxf5 Bxf5 Qxf5 Ng4 Qxd5+ >Kh8 g3 Nxe3 Nxe3 Qf6 f4 Qg6 >21:31:56.1 0.16 20 -2024641247 Bd6 Nf1 Qh4 Na3 a6 Re3 Nf6 Bxf5 Bxf5 Qxf5 Ng4 >Qxd5+ Kh8 g3 > >Fritz7: 1507 mhz 256 hash >1...Bd6 2.Nf1 Qh4 3.Re3 Nf6 4.f3 f4 5.Re2 Bh5 6.b3 Rae8 7.Ba3 > (-.38) Depth: 18/48 05:47:07 14824155kN >1...Bd6 2.Nf1 > (-.41) Depth: 19/52 14:00:51 36310193kN > (over 20 hours did not update analysis) > > >After: Nxf2 Kxf2 Bh4 g3 f4 > [D] r2q1rk1/ppp3pp/2n5/3p4/3P1pbb/2PB2P1/PPQN1K1P/RNB1R3 w - - 0 1 > >Fritz 7: 1507 mhz 192 hash >4.Kg2 fxg3 5.Bxh7+ Kh8 6.hxg3 Be7 > +- (2.63) Depth: 8/28 00:00:00 319kN >4.Kg2 f3+ > +- (2.44) Depth: 9/32 00:00:01 1303kN >4.Bxh7+ Kh8 5.Kg2 Qd7 6.gxh4 > +- (2.44) Depth: 9/32 00:00:02 1622kN >4.Bxh7+-- > +- (2.16) Depth: 10/30 00:00:03 2529kN >4.Bxh7+ Kh8 5.Kg2 fxg3 6.hxg3 Qd6 7.Nf1 Rxf1 > +- (2.13) Depth: 10/33 00:00:04 3022kN >4.Kg2! > +- (2.16) Depth: 10/33 00:00:05 3446kN >4.Kg2 fxg3 5.hxg3 Qd6 6.gxh4 Rf2+ 7.Kxf2 Qh2+ 8.Ke3 Qh3+ 9.Nf3 Qxf3+ 10.Kd2 > +- (2.19) Depth: 10/33 00:00:05 3928kN >4.Kg2 fxg3 5.Bxh7+ Kh8 6.hxg3 Qd6 7.Nf1 > +- (2.13) Depth: 11/33 00:00:14 10201kN >4.Kg2-- > +- (1.85) Depth: 12/36 00:00:23 15913kN >4.Kg2 fxg3 5.Bxh7+ Kh8 6.hxg3 Bh3+ 7.Kxh3 Bxg3 8.Nf3 Rxf3 9.Kg2 Bxe1 10.Kxf3 > +- (1.82) Depth: 12/39 00:00:33 23370kN >4.Kg2-- > +- (1.54) Depth: 13/40 00:01:09 49143kN >4.Kg2 fxg3 5.Rf1 gxh2 6.Bxh7+ Kh8 7.Kh1 Qd6 > ± (1.00) Depth: 13/44 00:01:54 81088kN >4.Kg2! > ± (1.29) Depth: 14/44 00:05:14 225140kN >4.Kg2 fxg3 5.hxg3 Bxg3 6.Bxh7+ Kh8 7.Rh1 Bh4 8.Qg6 Rf2+ 9.Kg1 Qe7 10.Ne4 Bf5 > ± (1.32) Depth: 14/44 00:06:40 287765kN >4.Kg2-- > ± (1.04) Depth: 15/43 00:10:58 474202kN >4.Kg2 fxg3 5.hxg3 Bxg3 6.Rh1 Qf6 7.Bxh7+ Kh8 8.Bg8+ Kxg8 > µ (-0.90) Depth: 15/50 00:40:12 1732610kN >4.Kg1! > µ (-0.87) Depth: 15/50 00:46:20 2000417kN >4.Kg1 fxg3 5.Nf1 gxh2+ 6.Qxh2 Bf2+ 7.Kg2 h5 8.Re2 Qf6 > µ (-0.84) Depth: 15/50 00:48:36 2101317kN > > >Shredder6: 2x1533 mhz 512 hash > 12.01 1:15 +1.42 4.Kg2 fxg3 5.hxg3 Bxg3 6.Bxh7+ Kh8 7.Rh1 Bh4 8.Qg6 Rf4 >9.Rf1 Bf5 10.Qxf5 Rxf5 11.Bxf5 (43.479.086) 578.9 > 13.01 2:03 +1.17-- 4.Kg2 fxg3 5.hxg3 Bxg3 6.Bxh7+ Kh8 7.Rh1 Bh4 8.Qg6 Rf4 >9.Rf1 Qf8 10.Rxf4 Qxf4 11.Kh1 Bf3+ 12.Nxf3 Qxc1+ 13.Ng1 Qxb2 14.Qg5 (70.624.732) >572.2 > 13.01 2:24 +0.67-- 4.Kg2 fxg3 5.hxg3 Bxg3 6.Bxh7+ Kh8 7.Rh1 Bh4 8.Qg6 Rf4 >9.Rf1 Qf8 10.Rxf4 Qxf4 11.Kh1 Bf3+ 12.Nxf3 Qxc1+ 13.Kg2 Qxb2+ 14.Qc2 Qxa1 >15.Nxh4 (82.450.456) 569.9 > 13.01 6:30 -0.85 4.Kg2 fxg3 5.hxg3 Bxg3 6.Rh1 Bh4 7.Nf1 Qf6 8.Bxh7+ Kh8 >9.Bd3 Rae8 10.Kg1 Be2 11.Bf5 (224.630.445) 575.2 > 14.01 21:15 -0.93 4.Kg2 fxg3 5.hxg3 Bxg3 6.Rh1 Bh4 7.Nf1 Qf6 8.Be3 Bf3+ 9.Kg1 >Bxh1 10.Kxh1 Qf3+ 11.Qg2 Rae8 12.Nbd2 Qxg2+ 13.Kxg2 Ne7 (752.907.205) 590.1 > 15.01 43:15 -1.18-- 4.Kg2 fxg3 5.hxg3 Bxg3 6.Rh1 Bh4 7.Nf1 Qf6 8.Be3 Rae8 >9.Kg1 Rxe3 10.Bxh7+ Kh8 11.Be4 Rxe4 12.Nbd2 (1.542.308.200) 594.1 > 15.01 51:49 -1.68-- 4.Kg2 fxg3 5.hxg3 Bxg3 6.Rh1 Bh4 7.Nf1 Qf6 8.Be3 Rae8 >9.Kg1 Rxe3 10.Bxh7+ Kh8 11.Nxe3 Bf2+ 12.Kf1 Qf3 13.Be4+ Bh3+ 14.Ng2 >(1.844.461.791) 593.2 > 15.01 68:02 -1.72 4.Kg2 fxg3 5.hxg3 Bxg3 6.Rh1 Bh4 7.Nf1 Qf6 8.Be3 Rae8 9.Kg1 >Rxe3 10.Bxh7+ Kh8 (2.464.855.967) 603.8 >kburcham Interesting that both Fritz and shredder did not find Bh3+ in their main line when Bh3+ was played in the game that the position is from it(asi alperopvich was black and he is even not a master): Here is the game line: 11...Nxf2 12.Kxf2 Bh4+ 13.g3 f4 14.Kg2 fxg3 15.hxg3 Bh3+ 16.Kxh3 Bxg3 17.Bxh7+ Kh8 18.Nf3 Rxf3 19.Rh1 Bf4+ 20.Kg2 Qg5+ Yace cannot see positive score for black but after 2 hours it can find the game line I do not know if Bh3+ is the fastest way to win but yace likes it at depth 14. I remember that I verified that 5...Bh3+ is good for black at that time. 4.Kg2 fxg3 5.hxg3 Bh3+ 6.Kxh3 Bxg3 7.Nf3 Rxf3 8.Bxh7+ Kh8 9.Kg2 Qf6 10.Re2 Bd6 11.Re3 Rf1 12.Bd3 Rf8 ² (0.62) Depth: 14 01:55:28 2508868kN Uri
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