Author: Ricardo Gibert
Date: 12:23:32 05/29/05
Go up one level in this thread
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.
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