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Subject: Re: Paderborn: two impressive moves by Rybka

Author: Vasik Rajlich

Date: 00:29:50 12/28/05

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.
>
>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
>

Rybka VP is playing in Paderborn. Ernst's output shows that the move was found
on the 17th ply. The difference is almost certainly a hash effect - he's using 1
GB, and his hash table has entries from the previous search and maybe a ponder
search if there was no ponderhit.

Vas

>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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