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Subject: Re: Zappa 1.1

Author: Mark Young

Date: 01:30:38 09/15/05

On September 14, 2005 at 17:05:59, Ernst Walet wrote:

>Because Zappa 1.1 is SMP and 64 bit, I gave it a try and was pleasant suprised.
>One of my favourite chess positions is this one, where Kasparov played Rxd4.
>How do other engines do? If your engine finds it please give it a couple of more
>plies to see if it holds it.

The better test for the engine in this position, is to see when the program see
that Rxd4 is not winning. Since Rxd4 is only a draw with best play.
This is why many programs will not play Rxd4, or drop the move with a longer
search.


>
>Ernst.
>
>
>[D]b2r3r/k4p1p/p2q1np1/NppP4/3p1Q2/P4PPB/1PP4P/1K1RR3 w - -
>
>CPU0: AuthenticAMD AMD64 Family 15 Model 43 Stepping 1 2203 MHz
>CPU1: AuthenticAMD AMD64 Family 15 Model 43 Stepping 1 2203 MHz
>GUI: Tablebases with 5 pieces found! [Cache: 16 MB + internal 13.67 MB]
>Engine: Zappa 1.1 (1024 MB)
>by Anthony Cozzie
>  9.00	 0:01 	-0.23 	1.Nc6+ Bxc6 2.Qxd6 Rxd6 3.dxc6 Rxc6 4.c3 dxc3 5.Re7+ Kb6
>6.bxc3 (2.190.136) 1401
> 10.00	 0:01 	-0.08 	1.Nc6+ Bxc6 2.Qxd6 Rxd6 3.dxc6 Nd5 4.c3 dxc3 5.c7 f5
>(2.585.518) 1414
> 10.00	 0:03 	-0.08 	1.Nc6+ Bxc6 2.Qxd6 Rxd6 3.dxc6 Nd5 4.c3 dxc3 5.c7 f5
>(4.590.886) 1498
> 11.00	 0:03 	-0.14 	1.Nc6+ Bxc6 2.Qxd6 Rxd6 3.dxc6 Kb6 4.Re7 Kxc6 5.Rxf7 Re8
>6.c3 (5.088.000) 1507
> 11.00	 0:05 	-0.14 	1.Nc6+ Bxc6 2.Qxd6 Rxd6 3.dxc6 Kb6 4.Re7 Kxc6 5.Rxf7 Re8
>6.c3 (8.923.952) 1568
> 12.00	 0:07 	-0.55 	1.Nc6+ Bxc6 2.Qxd6 Rxd6 3.dxc6 Kb6 4.Re7 Kxc6 5.Rde1 Nd5
>6.Rxf7 b4 (12.367.553) 1567
> 12.00	 0:17 	-0.55 	1.Nc6+ Bxc6 2.Qxd6 Rxd6 3.dxc6 Kb6 4.Re7 Kxc6 5.Rde1 Nd5
>6.Rxf7 b4 (28.349.537) 1621
> 13.00	 0:19 	-0.29 	1.Nc6+ Bxc6 2.Qxd6 Rxd6 3.dxc6 Kb6 4.Re7 Kxc6 5.Rde1 Rf8
>6.f4 Nd7 7.b3 (31.282.737) 1623
> 13.00	 0:32 	-0.25 	1.Rxd4 cxd4 2.Re7+ Kb6 3.Qxd4+ Kxa5 4.b4+ Ka4 5.Qc3 Bxd5
>6.Kb2 Qc5 7.bxc5 Rhe8 (53.481.819) 1643
> 13.00	 0:40 	-0.20 	1.Rxd4 Bxd5 2.Qxd6 Rxd6 3.Rd3 Kb6 4.b4 Re8 5.Rxe8 Nxe8
>6.Rc3 cxb4 7.axb4 (67.094.549) 1676
> 13.00	 0:41 	-0.20 	1.Rxd4 Bxd5 2.Qxd6 Rxd6 3.Rd3 Kb6 4.b4 Re8 5.Rxe8 Nxe8
>6.Rc3 cxb4 7.axb4 (69.988.250) 1676
> 14.00	 1:27 	-0.08 	1.Rxd4 Rhf8 2.Qxd6 Rxd6 3.Rd2 Kb6 4.b4 Rxd5 5.Nb3 cxb4
>6.axb4 Rxd2 7.Nxd2 Re8 (150.876.641) 1721
> 14.00	 1:46 	-0.08 	1.Rxd4 Rhf8 2.Qxd6 Rxd6 3.Rd2 Kb6 4.b4 Rxd5 5.Nb3 cxb4
>6.axb4 Rxd2 7.Nxd2 Re8 (183.700.881) 1719
> 15.00	 2:49 	-0.23 	1.Rxd4 Bxd5 2.Rxd5 Nxd5 3.Qxf7+ Nc7 4.Re6 Rd7 5.Rxd6 Rxf7
>6.Nc6+ Ka8 7.Ne5 Re7 8.f4 Rhe8 (293.486.566) 1734
> 15.00	 3:59 	-0.23 	1.Rxd4 Bxd5 2.Rxd5 Nxd5 3.Qxf7+ Nc7 4.Re6 Rd7 5.Rxd6 Rxf7
>6.Nc6+ Ka8 7.Ne5 Re7 8.f4 Rhe8 (412.069.282) 1721
> 16.00	 7:20 	-0.15 	1.Rxd4 Rhg8 2.Qxd6 Rxd6 3.Rf4 Kb6 4.b4 cxb4 5.axb4 Nxd5
>6.Rxf7 Nxb4 7.Nb3 Bd5 8.Rxh7 Bxf3 (741.746.107) 1684
> 16.00	 9:54 	-0.15 	1.Rxd4 Rhg8 2.Qxd6 Rxd6 3.Rf4 Kb6 4.b4 cxb4 5.axb4 Nxd5
>6.Rxf7 Nxb4 7.Nb3 Bd5 8.Rxh7 Bxf3 (991.280.574) 1666
>best move: Rd1xd4 time: 9:59.797 min  n/s: 1.666.541  nodes: 991.280.574

Re: Zappa 1.1, the whole game Vincent Lejeune 11:55:40 09/15/05
- Re: Zappa 1.1, the whole game Vincent Lejeune 12:07:48 09/15/05
Re: Zappa 1.1 Ed Schröder 03:26:30 09/15/05
- Re: Zappa 1.1 Gian-Carlo Pascutto 03:43:22 09/15/05
  - Re: Zappa 1.1 Ed Schröder 04:21:19 09/15/05
    - Re: Zappa 1.1 Ernst Walet 00:34:46 09/16/05
    - Re: Zappa 1.1 Robert Hyatt 11:07:05 09/15/05
      - Re: Zappa 1.1 Ed Schröder 11:25:17 09/15/05
        
        Re: Zappa 1.1 Ernst Walet 00:16:55 09/16/05
        
        Re: Zappa 1.1 Vladimir Xern 16:38:35 09/15/05
        
        Re: Zappa 1.1 Andreas Guettinger 14:03:28 09/15/05
        
        Re: Zappa 1.1 Eelco de Groot 14:52:44 09/15/05
        
        Re: Zappa 1.1 Vincent Lejeune 15:26:51 09/15/05
        
        Re: Zappa 1.1 Ed Schröder 00:27:32 09/16/05
        
        Re: Zappa 1.1 Vincent Lejeune 01:41:49 09/16/05
        
        Pro Deo 1.1 Vulcan finds 28.Ra7! Eelco de Groot 19:19:44 09/15/05
        
        Re: Pro Deo 1.1 Vulcan finds 28.Ra7! Eelco de Groot 19:20:55 09/15/05
        
        Re: Zappa 1.1 Uri Blass 14:07:11 09/15/05
        
        Re: Zappa 1.1 Uri Blass 14:49:59 09/15/05
        
        Re: Zappa 1.1 Andreas Guettinger 14:34:52 09/15/05
    - Re: Zappa 1.1 Andreas Guettinger 10:25:21 09/15/05
    - Re: Zappa 1.1 Gian-Carlo Pascutto 04:59:45 09/15/05
      - Re: Zappa 1.1 Ed Schröder 09:43:58 09/15/05
    - Re: Zappa 1.1 Patrick Jansen 04:46:32 09/15/05
    - Re: Zappa 1.1 Uri Blass 04:36:24 09/15/05
      - Re: Zappa 1.1 Bernhard Bauer 06:28:29 09/15/05
- Re: Zappa 1.1 Uri Blass 03:39:10 09/15/05

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