Author: Dan Ellwein
Date: 12:54:31 12/27/05
Go up one level in this thread
On December 27, 2005 at 10:40:05, Albert Silver wrote: >Rybka's 21-move miniature against Jonny was all the more interesting because of >two spectacular moves. Can your engines find them? > >[D]2k3nr/1ppr1qpp/p4p2/3P3b/1b6/4BN1P/PP1N1PP1/2RQR1K1 w - - 0 16 > >16.Nc4 deserves multiple exclamation points, especially due to the follow-up >expected next move. here's the output from CMX_Smooth (one of my 'positional settings') CMX_Smooth likes Qa4 in this position with a score of +1.19... it does consider Nc4 in some of its lines (g4 Bg6 Nc4...) P3/850 Time Depth Score Positions Moves ---- ---- ---- ---- ---- 0:00 1/3 1.33 869 1.Qb3 Bxd2 2.Bxd2 Qxd5 0:00 1/3 1.33 869 1.Qb3 Bxd2 2.Bxd2 Qxd5 0:00 1/4 1.33 2277 1.Qb3 Bxd2 2.Bxd2 Qxd5 0:00 1/5 1.16 10734 1.Qb3 Bxf3 2.Qxb4 Bxd5 3.b3 0:00 1/6 0.90 29860 1.Qb3 Bxf3 2.Qxb4 Bxd5 3.Nc4 Ne7 0:01 1/7 0.76 148136 1.Qb3 a5 2.g4 Bg6 3.Nc4 Kb8 4.Red1 0:02 1/7 0.99 171440 1.Qa4 Bxf3 2.Qxb4 Bxd5 3.Nc4 Bxc4 4.Rxc4 0:03 1/8 0.63 340326 1.Qa4 Bxf3 2.Qxb4 Bxd5 3.Nc4 Bxc4 4.Rxc4 Ne7 0:10 1/8 0.75 937701 1.d6 Bxd6 2.Qa4 Kb8 3.Bc5 Bxc5 4.Rxc5 Bxf3 5.Nxf3 0:18 1/9 0.87 1698144 1.d6 Bxd6 2.Qa4 Kb8 3.Rc3 Nh6 4.Rb3 Bxf3 5.Nxf3 0:42 2/10 0.69 4034194 1.d6 Bxd6 2.Qa4 Bxf3 3.Nxf3 Ne7 4.Bd2 Rhd8 5.Re2 Be5 1:07 2/10 0.78 6644409 1.g4 Bg6 2.Nc4 Bxe1 3.Nb6+ Kd8 4.Nxd7 Qxd7 5.Nxe1 Ne7 6.Rc5 1:56 2/11 0.67 11605138 1.g4 Bg6 2.Nc4 Bxe1 3.Nb6+ Kd8 4.Nxd7 Qxd7 5.Nxe1 Ne7 6.Rc5 Kc8 5:13 2/12 0.85 33229107 1.g4 Bg6 2.Nc4 Bxe1 3.Nb6+ Kd8 4.Nxd7 Qxd7 5.Qxe1 Ne7 6.Bc5 Nxd5 7.Nd4 7:09 2/12 1.12 45805602 1.Qa4 Bxf3 2.Qxb4 Bxd5 3.Qc5 Qg6 4.f3 Ne7 5.Qa7 Kd8 6.Bf4 Qf7 7.Rc3 Nc8 8.Qb8 11:58 3/13 1.19 79065767 1.Qa4 Bxf3 2.Qxb4 Bxd5 3.Qc5 Ne7 4.Qa7 Kd8 5.Qb8+ Nc8 6.Red1 Re8 7.Nf3 b5 8.Nd4 Qg6 Dan > >I give Rybka VP 32-bit's analysis running on an Athlon 3500+ Venice (512 MB >hash) here in contrast: > >Analysis by Rybka 1.01 Preview 2 32-bit: > >16.Qb3 Bxf3 17.Qxb4 Bxd5 18.Bf4 Nh6 19.Nc4 > ² (0.48) Depth: 10 00:00:03 460kN >16.Nc4 Bxe1 17.Nb6+ Kb8 18.Nxd7+ Qxd7 19.Qd4 b6 20.Nxe1 Ne7 > ² (0.61) Depth: 10 00:00:05 786kN >16.Nc4 Bxe1 17.Nb6+ Kd8 18.Nxd7 Qxd7 19.Qxe1 Bxf3 20.gxf3 Ne7 21.d6 > ² (0.52) Depth: 11 00:00:07 1199kN >16.Nc4 Bxe1 17.Nb6+ Kd8 18.Nxd7 Qxd7 19.Qxe1 Bxf3 20.gxf3 Ne7 21.d6 Nc6 > = (0.20) Depth: 12 00:00:16 2588kN >16.Qb3 Bxf3 17.Qxb4 Bxd5 18.Qb6 Kd8 19.Qa7 Ne7 20.Bf4 > ± (1.26) Depth: 12 00:00:24 3914kN >16.Qb3 Bxf3 17.Qxb4 Bxd5 18.Qb6 Kd8 19.Qa7 Ne7 20.Bf4 Nc8 > ± (1.19) Depth: 13 00:00:31 4968kN >16.Qb3 Bxf3 17.Qxb4 Bxd5 18.Qb6 Kd8 19.Qa7 Ne7 20.Bf4 Nc8 21.Qb8 c6 > ± (1.10) Depth: 14 00:00:46 7296kN >16.Qb3 Bxf3 17.Qxb4 Bxd5 18.Qb6 Kd8 19.Qa7 Ne7 20.Bf4 Nc8 21.Qb8 g5 > ± (1.25) Depth: 15 00:01:26 13585kN >16.Qb3 Bxf3 17.Qxb4 Bxd5 18.Qb6 Ne7 19.Qa7 b5 20.Qxa6+ Bb7 21.Qxb5 Qxa2 22.Nc4 >Bc6 > ± (1.25) Depth: 16 00:02:41 26031kN >16.Qb3 Bxf3 17.Qxb4 Bxd5 18.Qb6 Ne7 19.Qa7 b5 20.Qxa6+ Bb7 21.Qxb5 Qd5 22.Qxd5 >Bxd5 > ± (1.36) Depth: 17 00:06:23 63726kN >16.Qb3 Bxf3 17.Qxb4 Bxd5 18.Qb6 Ne7 19.Qa7 b5 20.Qxa6+ Bb7 21.Qxb5 Qd5 22.Qxd5 >Bxd5 > ± (1.12) Depth: 18 00:12:48 129472kN >16.Nc4 Bxe1 > +- (2.07) Depth: 18 00:42:53 407226kN > >Although hardware *and* running Rybka 64-bit obviously helped play a role, 42 >minutes is a lot, and my computer isn't THAT slow, so I wonder which Rybka >personality is being used. The SP setting, one that has caught Vasik's attention >yields: > >Analysis by Rybka 1.01 Preview 2 32-bit: > >16.Qa4 Bxf3 17.Qxb4 Bxd5 18.Qc5 b5 19.a4 Qg6 20.f3 > ± (1.17) Depth: 12 00:00:12 2104kN >16.Qa4 Bxf3 17.Qxb4 Bxd5 18.Qc5 b5 19.a4 Nh6 20.axb5 axb5 21.Qxb5 Qg6 > ± (1.23) Depth: 13 00:00:26 4427kN >16.Qa4 Bxf3 17.Qxb4 Bxd5 18.Qc5 b5 19.a4 Nh6 20.axb5 axb5 21.Qxb5 Qg6 22.f3 > ± (1.16) Depth: 14 00:00:50 8652kN >16.Qa4 Bxf3 17.Qxb4 Bxd5 18.Qc5 b5 19.a4 bxa4 20.Nc4 Bxc4 21.Rxc4 Qd5 22.Qf8+ >Rd8 > ± (1.21) Depth: 15 00:01:42 17912kN >16.Nc4 Bxe1 17.d6 Ba5 18.Nxa5 Ne7 19.Qd4 Bxf3 20.gxf3 Nd5 21.Qa7 Rxd6 22.Nxb7 > +- (1.64) Depth: 15 00:06:57 75037kN >16.Nc4 Bxe1 17.d6 Ba5 18.Nxa5 Ne7 19.Qd4 Bxf3 20.gxf3 Nd5 21.Qa7 Rxd6 22.Nxb7 >Kd7 > +- (1.71) Depth: 16 00:09:05 96915kN > > >Jonny took the rook (not that there weren't any better choices) > >[D]2k3nr/1ppr1qpp/p4p2/3P3b/2N5/4BN1P/PP3PP1/2RQb1K1 w - - 0 17 > >Analysis by Rybka VP 1.01 Preview 2 32-bit: > >17.Nb6+ Kd8 18.Nxd7 Qxd7 19.Qxe1 Bxf3 20.gxf3 Ne7 21.d6 Nc6 > = (0.20) Depth: 10 00:00:02 427kN >17.Nb6+ Kd8 18.Nxd7 Qxd7 19.Qxe1 Bxf3 20.gxf3 Ne7 21.d6 Nc6 22.dxc7+ Kxc7 >23.Bf4+ Kc8 > = (0.23) Depth: 11 00:00:06 1147kN >17.d6 Ba5 18.Nxa5 Ne7 19.Qd4 Bxf3 20.gxf3 Qg6+ 21.Kh2 f5 > ± (1.35) Depth: 11 00:00:13 2228kN >17.d6 Ba5 18.Nxa5 Qxa2 19.Nc4 c6 20.Qd5 Bf7 21.Nb6+ Kd8 > +- (2.02) Depth: 12 00:00:29 5070kN >17.d6 c6 18.Qd4 Kd8 19.Rxe1 Ke8 20.g4 Bg6 21.Nb6 Kf8 > +- (2.19) Depth: 13 00:00:59 10044kN
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