Author: Ricardo Gibert
Date: 12:58:25 05/29/05
Go up one level in this thread
On May 29, 2005 at 15:23:32, Ricardo Gibert wrote: >On May 29, 2005 at 15:18:48, Ricardo Gibert wrote: > >>On May 29, 2005 at 14:48:13, Ricardo Gibert wrote: >> >>>On May 29, 2005 at 14:43:47, Ricardo Gibert wrote: >>> >>>>On May 29, 2005 at 13:44:31, Jack Lad wrote: >>>> >>>>>[d] 8/8/P3kp2/1PR4p/4bp1P/2K3P1/8/8 w >>>>> >>>>>1.gxf4 is better and leads to a quicker win than 1.b6 so why do engines prefer >>>>>the latter? Or maybe your engine doesn't - let me know please. >>>> >>>>The engines are merely Queening his b-Pawn as quickly as possible. Black can't >>>>get a queen with f3, since the White King can stop that and if fxg3, then both >>>>will Queen, but after White plays Qb6+ Kf7 Rc7+, the Qb8 >>> >>>Oops! Make that the Qg1 >>> >>>> will hang due to a >>>>discovered attack. This what I see using my one brain cell. >> >>Ruffian prefers gxf4 from ply 1 and never waivers and eventually returns a mate >>score. >> >>Ruffian 1.0.1 UCI 13 MB: >>D1 00:00 6.67 gxf4 >>D2 00:00 6.64 gxf4 Ba8 >>D3 00:00 7.24 gxf4 f5 b6 >>D4 00:00 7.30 gxf4 Bf3 b6 Kd6 >>D5 00:00 7.74 gxf4 Kd6 Rxh5 Bf3 Rh7 >>D6 00:00 8.15 gxf4 Kd6 Rxh5 Kc7 Rc5 Kd6 Kd4 >>D7 00:00 8.25 gxf4 Kd6 Rxh5 Bf3 a7 Kc7 Rh8 Kb6 >>D8 00:00 8.41 gxf4 Kd6 b6 Kxc5 b7 f5 b8Q Kc6 >>D9 00:00 9.41 gxf4 Kd6 b6 Kxc5 b7 Bc6 b8Q Kd5 a7 Ke4 >>D10 00:00 10.76 gxf4 Bf3 Rc6 Bxc6 bxc6 Kd6 a7 Kxc6 a8Q Kd6 Qa6 Ke7 Qe2 Kf7 >>Qxh5 Ke6 Kd4 >>D11+ 00:01 11.11 gxf4 >>D11 00:01 14.85 gxf4 f5 b6 Kd6 Kd4 Bc6 b7 Kc7 Rxc6 Kxc6 b8R Kd7 a7 Ke6 a8Q >>D12- 00:02 14.50 gxf4 >>D12 00:02 14.95 gxf4 f5 b6 Kd6 Kd4 Bc6 b7 Kc7 Rxc6 Kxc6 b8R Kd7 a7 Ke7 >>D13- 00:03 14.60 gxf4 >>D13 00:04 15.27 gxf4 f5 b6 Kd6 Kd4 Ke6 b7 Bxb7 axb7 Kf6 Rc6 Ke7 Ke5 Kd7 Rc3 >>Ke7 >>D14- 00:06 14.92 gxf4 >>D14+ 00:07 15.62 gxf4 >>D14 00:10 16.60 gxf4 Bf3 b6 Kd6 Kd4 f5 b7 Bxb7 axb7 Ke6 Rc6 Kf7 Ke5 >>D15+ 00:15 16.95 gxf4 >>D15 00:27 20.46 gxf4 Bf3 b6 Kd6 Kd4 Bc6 b7 Kc7 Rxc6 Kxc6 b8Q Kd7 Qb5 Ke7 a7 >>Ke6 Qd5 >>D16+ 00:42 20.81 gxf4 >>D16 02:10 M11 gxf4 Bf3 b6 Kd6 Kd4 Bc6 b7 Kc7 b8Q Kxb8 Rxc6 f5 Kc5 Ka7 Rc7 Ka8 >>Kb6 Kb8 a7 Ka8 Rc8 >>D17 02:44 M11 gxf4 Bf3 b6 Kd6 Kd4 Bc6 b7 Kc7 b8Q Kxb8 Rxc6 Ka8 Kc5 Ka7 f5 Ka8 >>Kb6 Kb8 a7 Ka8 Rc8 >>D18 03:32 M11 gxf4 Bf3 b6 Kd6 Kd4 Bc6 b7 Kc7 b8Q Kxb8 Rxc6 Ka8 Kc5 Ka7 f5 Ka8 >>Kb6 Kb8 a7 Ka8 Rc8 >>D19 05:15 M11 gxf4 Bf3 b6 Kd6 Kd4 Bc6 b7 Kc7 b8Q Kxb8 Rxc6 Ka8 Kc5 Ka7 f5 Ka8 >>Kb6 Kb8 a7 Ka8 Rc8 >> >> >>After forcing 1.b6 Ruffian finds an equally fast mate: >> >>[D]8/8/PP2kp2/2R4p/4bp1P/2K3P1/8/8 b - - >> >>Ruffian 1.0.1 UCI 13 MB: >>D1 00:00 4.97 fxg3 Rxh5 >>D2 00:00 4.97 fxg3 Rxh5 >>D3 00:00 4.02 fxg3 Rxh5 g2 b7 g1Q b8Q >>D4 00:00 4.02 fxg3 Rxh5 g2 b7 g1Q b8Q >>D5 00:00 4.02 fxg3 Rxh5 g2 b7 g1Q b8Q >>D6 00:00 6.14 fxg3 Kd4 g2 Rc1 Bd3 Kxd3 Kd6 >>D7 00:00 7.30 fxg3 Kd4 g2 Rc1 Kd6 Kxe4 Ke6 b7 f5 Kf4 >>D7 00:00 6.48 f3 Kd4 f2 Rc1 Bg2 b7 f1Q Rxf1 Bxf1 b8Q Bxa6 >>D8 00:00 8.71 f3 Kd4 f2 Rc1 Bg2 b7 Kd7 b8Q f1R >>D9 00:00 9.17 f3 Kd4 f2 Rc1 Bg2 b7 f5 b8Q f1R Rxf1 Bxf1 >>D10 00:00 9.81 f3 Kd4 f2 Rc1 Bg2 b7 f1Q Rxf1 Bxf1 a7 Be2 b8Q >>D11 00:01 9.92 f3 b7 f2 b8Q f1Q Qb3 Kd7 Qa4 Kd6 Qd4 Ke6 Qxe4 Kd7 Qd3 Qxd3 >>Kxd3 f5 a7 Kd6 a8Q Kxc5 >>D12+ 00:01 10.27 f3 >>D12 00:05 18.95 f3 b7 f2 b8Q f1Q Qb3 Kd7 Qa4 Qb5 Qxb5 Ke6 Rc6 Bxc6 Qxc6 Kf5 >>Qf3 Kg6 a7 f5 a8Q >>D12 00:09 14.70 fxg3 b7 g2 b8Q g1Q Qb6 Kf7 Rc7 Kg6 Qxg1 Kf5 Qc5 Kg4 Rg7 Kf3 >>Qxh5 Kf4 Kd4 >>D13- 00:13 14.35 fxg3 >>D13+ 00:14 15.05 fxg3 >>D13 00:26 15.98 fxg3 b7 g2 b8Q g1Q Qb6 Kf7 Rc7 Kg6 Qxg1 Kf5 Qe3 Bh1 Qh3 Ke5 >>Qh2 Ke4 Qxh1 Ke3 >>D14+ 00:34 16.33 fxg3 >>D14 00:40 19.41 fxg3 b7 g2 b8Q g1Q Qb6 Kf7 Rc7 Kg6 Qxg1 Kf5 Qf1 Ke6 Kd4 Bc6 >>Rxc6 Kd7 a7 Kxc6 a8Q Kd7 Qxf6 >>D15+ 01:08 19.76 fxg3 >>D15 01:18 23.80 fxg3 b7 g2 b8Q g1Q Qb6 Kf7 Rc7 Kg6 Qxg1 Kf5 Qf2 Kg6 Qe3 Bc2 >>a7 Kf5 Kxc2 Kg6 Qe8 Kh6 a8Q >>D15- 01:24 19.06 f3 >>D15 01:42 M10 f3 b7 f2 b8Q f1Q Qb3 Kd7 Qa4 Qb5 Qxb5 Ke6 Rc7 Bc6 Qxc6 Kf5 Re7 >>Kg4 Rg7 Kf5 Qd5 >>D16 05:35 M10 f3 b7 f2 b8Q f1Q Qb3 Kd7 Qa4 Qb5 Qxb5 Ke6 Rc7 Bc6 Qxc6 Kf5 Re7 >>Kg4 Rg7 Kf5 Qd5 >> >>The above mate starts with 1.b6 f3. I wanted see what happened after 1.b6 fxg3 >>so I forced both moves: >> >>[D]8/8/PP2kp2/2R4p/4b2P/2K3p1/8/8 w - - >> >>Ruffian 1.0.1 UCI 13 MB: >>D1 00:00 4.97 Rxh5 >>D2 00:00 4.02 Rxh5 g2 b7 g1Q >>D3 00:00 4.02 Rxh5 g2 b7 g1Q b8Q >>D4 00:00 4.02 Rxh5 g2 b7 g1Q b8Q >>D5 00:00 3.87 Rxh5 g2 b7 Kf7 a7 Kg6 Rb5 g1Q b8Q >>D5 00:00 4.76 b7 g2 b8Q g1Q Qe8 Kd6 Rxh5 >>D5 00:00 6.14 Kd4 g2 Rc1 Bd3 Kxd3 Kd6 >>D6 00:00 7.30 Kd4 g2 Rc1 Kd6 Kxe4 Ke6 b7 f5 Kf4 >>D7 00:00 8.35 Kd4 g2 Rc1 Bc6 b7 Bb5 Rg1 Bxa6 b8Q >>D7 00:00 10.86 b7 g2 b8Q g1Q Qb6 Bc6 Rxc6 Kd7 Rd6 Ke7 Qxg1 Kxd6 >>D8 00:00 10.86 b7 g2 b8Q g1Q Qb6 Bc6 Rxc6 Kd5 Rd6 Ke5 Qxg1 Kxd6 >>D9 00:00 13.01 b7 g2 b8Q g1Q Qb6 Bc6 Rxc6 Kd5 Rd6 Ke5 Qd4 Qxd4 Rxd4 f5 a7 f4 >>a8Q >>D10 00:01 12.86 b7 g2 b8Q Kf7 Qb3 Kg7 Rc7 Kg6 Re7 Bc6 Qb1 f5 Re6 Kf7 Rxc6 >>D11+ 00:02 13.21 b7 >>D11 00:03 14.70 b7 g2 b8Q g1Q Qb6 Kf7 Rc7 Kg6 Qxg1 Kf5 Qc5 Kg4 Rg7 Kf3 Qxh5 >>Kf4 Kd4 >>D12+ 00:05 15.05 b7 >>D12 00:07 16.37 b7 g2 b8Q g1Q Qb6 Kf7 Rc7 Kg6 Qxg1 Kf5 a7 Ba8 Qf1 Ke6 Qc4 >>Ke5 Re7 Kf5 Qc8 Kf4 Qxa8 >>D13- 00:09 16.02 b7 >>D13+ 00:13 16.72 b7 >>D13 00:31 23.80 b7 g2 b8Q g1Q Qb6 Kf7 Rc7 Kg6 Qxg1 Kf5 Qf2 Kg6 Qe3 Bc2 a7 >>Kf5 Kxc2 Kg6 Qe8 Kh6 a8Q >>D14 00:41 23.80 b7 g2 b8Q g1Q Qb6 Kf7 Rc7 Kg6 Qxg1 Kf5 Qf2 Kg6 Qe3 Bc2 a7 >>Kf5 Kxc2 Kg6 Qe8 Kh6 a8Q >>D15+ 00:56 24.15 b7 >>D15 01:14 25.69 b7 g2 b8Q g1Q Qb6 Kf7 Rc7 Kg6 Qxg1 Kf5 Re7 Bf3 Qd4 Bc6 Rf7 >>Be4 Rxf6 Kg4 Qxe4 Kh3 a7 Kh2 a8Q >>D16+ 01:37 26.04 b7 >>D16 02:10 M13 b7 g2 b8Q g1Q Qb6 Kf7 Rc7 Kg6 Qxg1 Kf5 Qd4 Kf4 Qxf6 Bf5 Qg5 Ke5 >>Re7 Kd6 Qf6 Be6 Rxe6 Kd7 Re7 Kd8 Qf8 >>D17 03:44 M12 b7 g2 b8Q g1Q Qb6 Kf7 Rc7 Kg6 Qxg1 Kf5 Rf7 Ke6 Qg7 Kd5 Rxf6 Bf5 >>Rxf5 Ke6 Qg6 Ke7 Rf7 Ke8 Qg8 >>D18 05:30 M10 b7 g2 b8Q g1Q Qb6 Kf7 Rc7 Kg6 Qxg1 Kf5 Kd4 Ke6 Qe3 Kd6 Qf4 Ke6 >>Qxe4 Kd6 Qe7 >> >>Mate in 10 as expected. >> >>Conclusion: 1.b6 and 1.fxg4 win equally fast according Ruffian. > >Argh! Make that 1.gxf4... > >I need to practice my chess notation. Too much internet chess it seems. After reading Merlino's post I forced 1.gxf4 and finally got the mate in 10 that he got: [D]8/8/P3kp2/1PR4p/4bP1P/2K5/8/8 b - - Ruffian 1.0.1 UCI 13 MB: D1 00:00 6.65 f5 D1 00:00 6.64 Ba8 D2 00:00 8.06 Ba8 Rxh5 D2 00:00 7.24 f5 b6 D3 00:00 8.64 f5 Re5 Kd6 Rxe4 fxe4 D3 00:00 7.30 Bf3 b6 Kd6 D4 00:00 9.75 Bf3 Rc6 Bxc6 bxc6 Kd6 a7 Kxc6 a8Q D4 00:00 7.74 Kd6 Rxh5 Bf3 Rh8 D5 00:00 8.15 Kd6 Rxh5 Kc7 Rc5 Kd6 Kd4 D6 00:00 8.25 Kd6 Rxh5 Bf3 a7 Kc7 Rh8 Kb6 D7 00:00 8.41 Kd6 b6 Kxc5 b7 f5 b8Q Kc6 D8 00:00 9.41 Kd6 b6 Kxc5 b7 Bc6 b8Q Kd5 a7 Ke4 D9 00:00 11.83 Kd6 Kd4 Bf3 b6 Bc6 b7 Kc7 Rxc6 Kxc6 b8Q f5 D9 00:00 10.86 Bf3 Rc6 Bxc6 bxc6 Kd6 a7 Kxc6 a8Q Kd7 Kd4 Ke6 Qd5 Ke7 Qxh5 Ke6 D10 00:00 14.97 Bf3 b6 f5 b7 Bxb7 axb7 Kd6 Kd4 Ke6 Rc6 Kd7 Kd5 Ke7 b8Q D10- 00:01 10.51 Kd6 D10 00:01 14.97 Kd6 Kd4 Bf3 b6 f5 b7 Bxb7 axb7 Ke6 Rc6 Kd7 Kd5 Ke7 D11 00:01 14.90 Kd6 Kd4 Bf3 b6 Bc6 b7 Kc7 Rxc6 Kxc6 b8R Kd7 a7 Ke6 a8Q D12- 00:01 14.55 Kd6 D12+ 00:01 15.25 Kd6 D12 00:01 15.27 Kd6 Kd4 f5 b6 Bf3 b7 Bxb7 axb7 Ke6 Rc6 Kd7 Rc3 Ke7 Ke5 Kf7 b8Q D13+ 00:02 15.62 Kd6 D13- 00:03 14.92 Kd6 D13 00:04 19.45 Kd6 Kd4 Bf3 b6 Bc6 b7 Kc7 Rxc6 Kxc6 b8Q Kd7 a7 Ke6 Qc8 Kf7 Ke4 Kg6 a8Q D14+ 00:09 19.80 Kd6 D14- 00:10 19.10 Kd6 D14 00:12 20.51 Kd6 Kd4 Bf3 b6 Bc6 b7 Kc7 Rxc6 Kxc6 b8Q Kd7 Qb5 D15+ 00:17 20.86 Kd6 D15- 00:21 20.16 Kd6 D15 00:23 24.74 Kd6 Kd4 Bf3 b6 Ke6 b7 Bc6 Rxc6 Kf5 a7 Kxf4 b8Q Kg4 Qg8 D16 00:59 24.90 Kd6 Kd4 Bf3 b6 Ke6 b7 Bc6 Rxc6 Kf5 a7 Kg4 b8Q Kxh4 Rxf6 Kh3 Qb3 Kh2 Qf3 h4 a8Q D16- 01:15 24.39 Bf3 D16 01:28 24.90 Bf3 b6 Kd6 Kd4 Ke6 b7 Bc6 Rxc6 Kf5 a7 D17+ 01:53 25.25 Bf3 D17 03:35 M10 Bf3 b6 Bd5 b7 Kf5 b8Q Kg4 Rxd5 Kf3 Rd3 Kg4 Qg8 Kf5 Rd5 Ke4 Qg2 Kxf4 Rd4 Kf5 Qe4 D18 05:38 M10 Bf3 b6 Bd5 b7 Kf5 b8Q Kg4 Rxd5 Kf3 Rd3 Kg4 Qg8 Kf5 Rd5 Ke4 Qg2 Kxf4 Rd4 Kf5 Qe4 D19 06:55 M9 Bf3 b6 Bd5 b7 Kf5 Rxd5 Kg4 b8Q Kf3 Rd3 Kg4 Qe8 Kxf4 a7 Kf5 a8Q Kg4 Qae4 So 1.gxf4 is faster after all. Difficult for Ruffian. BTW, all this is on my 1.3 ghz Centrino.
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