Can your engine find this move from the 6th Freestyle final?

[smirobth]

That you found this combination in a blitz freestyle game is very impressive. Congratulations on a beautiful combination and an excellent game. I tried several programs on my quad core Opteron system running Vista x64, typically for about 20 minutes each. None of them found you excellent move Bc7!! May I ask what program you were using at the time to assist with your analysis? The whole line you give is 30 plies long so it is perhaps not so surprising that programs don't find it. How deep did you have to get beyond Bc7 before the program(s) knew you were on the right track?

[Chris Taylor]

[quote="Alkelele"][quote="Chris Taylor"]I am going to put ZapChess Zanzibar 64 bit on this. My next post will be that then! If I do get chance I will bang Rybka on as well.

Happy weekends regards..

Chris[/quote]

Is Zappa Zanzibar still calculating, struggling to find 24.Bc7? [/quote]

Hi

In both cases after a couple of hours no 24.Bc7

New game
r1b1r1k1/1p1nnpp1/pq1Bp2p/8/4N3/6Q1/2PRB1PP/5R1K w - - 0 1

Analysis by Zap!Chess Zanzibar x64:

1.Qf4 f5 2.Bh5 g6 3.Bxe7 e5 4.Qh4 gxh5
³ (-0.64) 00:00:01
1.Qf3 f5 2.Bc4 Nd5 3.Qh5 Qd8 4.Rxd5 exd5 5.Bxd5+ Kh8 6.Qxf5
³ (-0.63) 00:00:01
= (-0.17) Depth: 10/31 00:00:02 1562kN
1.Bc5
= (-0.16) Depth: 10/34 00:00:04 3258kN
1.Qf3 f5 2.Bc4 Nd5 3.Qh5 N7f6 4.Nxf6+ Nxf6 5.Qxf5 Qe3 6.Bf4 Qe4 7.Qc5 b5
= (-0.17) Depth: 10/34 00:00:05 3258kN
= (-0.22) Depth: 12/40 00:00:17 17228kN
1.Bc5 Nxc5 2.Nf6+ Kf8 3.Nxe8 Nf5 4.Qc7 Qxc7 5.Nxc7 Rb8 6.g4 Ne4 7.Rd8+ Ke7 8.Re8+ Kd7 9.gxf5 Kxc7 10.Re7+ Kd6 11.Rxf7 exf5 12.Rxg7 Be6 13.Rfg1 Rc8 14.c4 Bxc4 15.Bxc4 Rxc4 16.Rxb7
= (-0.21) Depth: 12/40 00:00:18 17228kN
= (0.17) Depth: 19/58 00:45:19 2987mN
1.Bh5
= (0.18) Depth: 19/58 01:02:34 4111mN
= (0.18) Depth: 19/58 01:02:34 4111mN

(Taylor, Notts 30.06.2007)

New game
r1b1r1k1/1p1nnpp1/pq1Bp2p/8/4N3/6Q1/2PRB1PP/5R1K w - - 0 1

Analysis by Rybka 2.3.2 mp :

1.Bc7 Qc6
³ (-0.41) Depth: 5 00:00:00
1.Qf3 Nf5
= (-0.12) Depth: 5 00:00:00
1.Bc5 Qc6 2.Rxd7 Bxd7 3.Nf6+ Kh8 4.Nxe8 Rxe8 5.Rxf7
= (-0.11) Depth: 6 00:00:00 20kN
= (-0.02) Depth: 8 00:00:00 49kN
1.Be5 Ng6 2.Bc3 Rf8 3.Nd6 Qd8 4.Nxf7 Rxf7 5.Qxg6 Qe7 6.Rdd1 b5 7.Rxf7 Qxf7
= (0.21) Depth: 8 00:00:00 88kN
² (0.38) Depth: 24 01:03:01 1026mN

(Taylor, Notts 30.06.2007)
AMD 4600 Dual 64 bit OS running 64 bit versions.

I really liked you very nice combination. Thanks for sharing it!!!

Chris

[Alkelele]

That you found this combination in a blitz freestyle game is very impressive. Congratulations on a beautiful combination and an excellent game. I tried several programs on my quad core Opteron system running Vista x64, typically for about 20 minutes each. None of them found you excellent move Bc7!! May I ask what program you were using at the time to assist with your analysis? The whole line you give is 30 plies long so it is perhaps not so surprising that programs don't find it. How deep did you have to get beyond Bc7 before the program(s) knew you were on the right track?

Thanks! It was not quite a blitz game, the time control was 60 minutes + 15 seconds pr. move. I spent 3 minutes on 24.Bc7, and when I played it, I knew it was winning, having analysed sufficiently all relevant lines. For analysis, I used 2 Rybka 2.3.2b's, one running on a quad Intel, one running on a dual Opteron.

In general, engines need to realize the strength of 30.Qxf5 before they can see that 24.Bc7 is strong. My interest here is to see how difficult it is for engines to realize this from the root position -- without the help of human intervention

[Alkelele]

Thanks, Chris. Next week, I can probably arrange for a quad Intel to take a 24 hour look on the position with either Rybka or Zappa Zanzibar or Hiarcs 11.1. It will be interesting to see if they can find it within that time-frame, or not.