Author: Uri Blass
Date: 10:29:39 12/30/01
Go up one level in this thread
On December 30, 2001 at 12:34:37, Robert Basham wrote: >That's the point; white is ahead in material, and was winning. > >I always thought that when we are ahead in material, we should exchange pieces, >etc. Rxf5 is winning material and this is the reason that computers may play it but it is not the only winning move. here is analysis of some top programs on p800 with 48Mbytes hash tables New position [D]r2qr1k1/pp2p2p/3p2pB/3Npb2/1PP1N3/7P/P3B1P1/Q4RK1 w - - 0 1 Analysis by Chess Tiger 14.0: 1.Bf3 Be6 2.Qd1 b6 3.Rf2 Rc8 +- (5.80) Depth: 7 00:00:00 84kN 1.Bf3 Bd7 2.Qd1 a5 3.Bg5 Be6 4.c5 axb4 5.cxd6 Rxa2 6.Bxe7 +- (6.02) Depth: 7 00:00:00 108kN 1.Bf3 Bd7 2.Qd1 a5 3.b5 Rc8 4.Qd3 Be6 +- (5.92) Depth: 8 00:00:01 196kN 1.Bf3 Rc8 2.c5 Be6 3.Qd1 Kh8 4.Bg5 Qd7 5.cxd6 exd6 +- (6.08) Depth: 9 00:00:02 435kN 1.Bf3 a5 2.c5 Bxe4 3.Bxe4 axb4 4.cxd6 Qxd6 5.Qb2 Rec8 6.Qf2 Qe6 +- (6.18) Depth: 10 00:00:05 1101kN 1.Bf3 a5 2.c5 Bxe4 3.Bxe4 axb4 4.Qb2 Qa5 5.cxd6 Qc5+ 6.Be3 Qxd6 7.Qf2 +- (6.62) Depth: 11 00:00:11 2319kN 1.Bf3 a5 2.c5 Bxe4 3.Bxe4 axb4 4.Qb2 Kh8 5.Rf7 Kg8 6.Qf2 dxc5 7.Rg7+ Kh8 8.Qxc5 Rxa2 9.Qxb4 +- (6.50) Depth: 12 00:00:15 3149kN 1.Bf3 a5 2.c5 Bxe4 3.Bxe4 axb4 4.Qb2 Kh8 5.Qf2 dxc5 6.Qf7 Rg8 7.Nxe7 Qd6 +- (6.88) Depth: 13 00:00:51 11226kN 1.Rxf5 +- (7.40) Depth: 13 00:00:57 12739kN 1.Rxf5 gxf5 2.Qc3 Rf8 3.Qg3+ Kf7 4.Ng5+ Ke8 5.Bxf8 Kd7 6.Bxe7 Qc8 7.Bf6 +- (10.44) Depth: 13 00:01:09 15610kN 1.Rxf5 +- (11.34) Depth: 14 00:01:39 23099kN (Blass, Tel-aviv 30.12.2001) New position r2qr1k1/pp2p2p/3p2pB/3Npb2/1PP1N3/7P/P3B1P1/Q4RK1 w - - 0 1 Analysis by Deep Fritz: 1.Rxf5-- +- (2.34) Depth: 1/3 00:00:00 1.Rxf5-- +- (2.34) Depth: 1/3 00:00:00 1.Bf3! +- (3.31) Depth: 1/4 00:00:00 1.Bf3! +- (4.31) Depth: 1/4 00:00:00 1.Bf3 Rc8 +- (4.22) Depth: 2/7 00:00:00 1.Bf3 Rc8 2.Qc3 +- (4.22) Depth: 3/12 00:00:00 1kN 1.Bf3 a5 2.b5 Rc8 +- (4.19) Depth: 4/17 00:00:00 2kN 1.Bf3 a5 2.b5 Rc8 3.Qc3 +- (4.19) Depth: 5/18 00:00:00 8kN 1.Bf3 a5 2.b5 Rc8 3.Qc3 a4 +- (4.16) Depth: 6/20 00:00:00 32kN 1.Bf3 a5 2.b5 Rc8 3.Qc3 Bxe4 4.Bxe4 Rc5 +- (4.22) Depth: 7/22 00:00:00 89kN 1.Bf3 a5 2.b5 Rc8 3.Qc3 a4 4.Qb4 Bxe4 5.Bxe4 +- (4.22) Depth: 8/27 00:00:00 278kN 1.Bf3 a5 2.b5 Rc8 3.Qc3 a4 4.Qb4 Bxe4 5.Bxe4 a3 6.Qxa3 +- (4.34) Depth: 9/28 00:00:01 1149kN 1.Bf3 a5 2.b5 Rc8 3.Qc3 a4 4.Qb4 a3 5.Qxa3 Rxc4 +- (4.25) Depth: 10/28 00:00:03 2364kN 1.Bf3 a5 2.Be3 axb4 3.Bb6 Qc8 4.Nc7 Rf8 5.Nxa8 Qxa8 6.c5 +- (4.47) Depth: 11/32 00:00:19 12540kN 1.Ng5! +- (4.50) Depth: 11/32 00:00:22 14370kN 1.Ng5! e6 2.Qd1 a5 3.g4 axb4 4.gxf5 exf5 5.Qd2 Ra4 6.Bf3 +- (4.97) Depth: 11/32 00:00:24 15736kN 1.Rxf5! +- (5.00) Depth: 11/32 00:00:25 16882kN 1.Rxf5! gxf5 2.Qc3 Kh8 3.Ng5 Rf8 4.Ne6 Qd7 5.Nxf8 Qa4 6.Qf3 +- (6.97) Depth: 11/32 00:00:29 19350kN 1.Rxf5! +- (7.28) Depth: 12/31 00:00:33 21515kN 1.Rxf5! gxf5 2.Qc3 Kh8 3.Ng5 Kg8 +- (8.25) Depth: 12/31 00:00:35 23308kN 1.Rxf5! +- (8.56) Depth: 13/37 00:00:44 29522kN 1.Rxf5! +- (8.88) Depth: 14/35 00:00:57 38788kN 1.Rxf5! gxf5 2.Qc3 Kh8 3.Ng5 Qd7 4.Nf7+ Kg8 5.Bh5 f4 6.Nxf4 Qf5 +- (9.59) Depth: 14/36 00:01:09 47696kN 1.Rxf5 gxf5 2.Qc3 Kh8 3.Ng5 Rf8 4.Qg3 Qe8 5.Ne6 Qg6 6.Bg7+ Kg8 +- (9.47) Depth: 15/38 00:01:45 75031kN (Blass, Tel-aviv 30.12.2001) New position r2qr1k1/pp2p2p/3p2pB/3Npb2/1PP1N3/7P/P3B1P1/Q4RK1 w - - 0 1 Analysis by Junior 7: 1.Rxf5 gxf5 2.Ng5 +- (2.55) Depth: 3 00:00:00 1.Nf2 e6 2.Nc3 +- (3.21) Depth: 3 00:00:00 1.Ng3 Rf8 2.Nxf5 +- (3.38) Depth: 3 00:00:00 1.Ng5 e6 2.Nc3 +- (3.59) Depth: 3 00:00:00 1.Ng5 e6 2.Qd1 e4 3.Nc3 +- (3.49) Depth: 6 00:00:00 3kN 1.Ng5! +- (3.79) Depth: 9 00:00:00 38kN 1.Ng5! e6 2.Qd1 e4 3.g4 exd5 4.Qxd5+ Be6 5.Nxe6 +- (3.93) Depth: 9 00:00:00 68kN 1.Ng5 e6 2.Qd1 Rc8 3.g4 exd5 4.Qxd5+ Be6 +- (4.19) Depth: 12 00:00:01 754kN 1.Ng5 e6 2.g4 exd5 3.gxf5 Qb6+ 4.c5 dxc5 5.f6 cxb4+ 6.Rf2 Kh8 7.f7 Re7 8.f8Q+ Rxf8 9.Bxf8 Re8 10.Nf7+ +- (4.32) Depth: 15 00:00:11 6845kN 1.Rxf5! +- (4.49) Depth: 15 00:00:14 8501kN 1.Rxf5! gxf5 2.Qc3 f4 3.Nxf4 Kh8 4.Ng5 Rf8 5.Nfe6 Qb6+ 6.c5 dxc5 7.Bxf8 Rxf8 8.Nxf8 +- (5.67) Depth: 15 00:00:19 11130kN 1.Rxf5! +- (5.97) Depth: 17 00:00:45 25946kN (Blass, Tel-aviv 30.12.2001) > >I just played through my old game this morning, and the position is correct.. > >I still think that computors should play RxB in this kind of position... They usually play it if they get enough time as my analysis show but it is not important because they can win even without RxB. Uri
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