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Subject: Re: Another interesting Anti-Null move position (from a real game)

Author: Jaime Benito de Valle Ruiz

Date: 15:22:12 06/14/04

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>1.gxh5 Qg4+ 2.Kf2 Qf4+ 3.Ke1 Kxh5 4.Ke2 g5 5.Kd3 Qf1+ 6.Kd2
>  ³  (-0.30)   Depth: 8/28   00:00:01  558kN
>1.gxh5 Qg4+ 2.Kf2 Qf4+ 3.Ke2 gxh5 4.Qg7+ Kh4 5.Qd4 Qg4+ 6.Kd2 Qe6 7.Qd5
>  ³  (-0.30)   Depth: 9/31   00:00:02  1287kN
>1.Qd2+
>  ³  (-0.29)   Depth: 9/31   00:00:02  1450kN
>1.Qd2+
>  =  (0.00)   Depth: 9/31   00:00:02  1451kN
>1.Qd2+
>  ²  (0.60)   Depth: 9/31   00:00:02  1452kN
>1.Qd2+ Kxg4 2.Qe3 b5 3.axb5 a4 4.bxa4
>  ±  (0.79)   Depth: 9/31   00:00:02  1454kN
>1.Qd2+ Kxg4 2.Qe3 b5 3.axb5 a4 4.bxa4
>  ±  (0.79)   Depth: 10/31   00:00:03  1533kN
>1.Qd2+
>  ±  (1.09)   Depth: 11/31   00:00:03  1721kN
>1.Qd2+
>  +-  (1.69)   Depth: 11/31   00:00:04  1726kN
>1.Qd2+ Kxg4 2.Qe3 b5 3.axb5 a4 4.bxa4 b3 5.Qxb3
>  +-  (2.65)   Depth: 11/32   00:00:04  1836kN
>1.Qd2+
>  +-  (2.35)   Depth: 12/34   00:00:05  2428kN
>1.Qd2+
>  +-  (1.75)   Depth: 12/34   00:00:05  2939kN
>1.Qd2+ Kxg4 2.Qe3 b5 3.axb5 a4 4.bxa4 b3 5.Qxb3
>  +-  (2.65)   Depth: 12/34   00:00:05  2965kN
>1.Qd2+
>  +-  (2.35)   Depth: 13/36   00:00:07  4004kN
>1.Qd2+
>  +-  (1.75)   Depth: 13/36   00:00:07  4759kN
>1.Qd2+ Kxg4 2.Qe3 b5 3.axb5 a4 4.bxa4 b3 5.Qxb3 Kf4 6.Qf3+ Ke5 7.Qg3+ Qxg3+
>8.Kxg3
>  +-  (2.51)   Depth: 13/36   00:00:07  4839kN, tb=2
>1.Qd2+
>  +-  (2.21)   Depth: 14/41   00:00:10  7208kN, tb=2
>1.Qd2+
>  +-  (2.81)   Depth: 14/41   00:00:11  7429kN, tb=9
>1.Qd2+ Kxg4 2.Qe3 b5 3.axb5 a4 4.bxa4 b3 5.Qxb3 Kf4 6.Qf7+ Ke5 7.Qxg6
>  +-  (3.16)   Depth: 14/41   00:00:11  7568kN, tb=9
>1.Qd2+
>  +-  (3.46)   Depth: 15/41   00:00:15  10115kN, tb=14
>1.Qd2+
>  +-  (4.06)   Depth: 15/41   00:00:15  10477kN, tb=14
>1.Qd2+
>  +-  (5.86)   Depth: 15/45   00:00:16  11180kN, tb=14
>1.Qd2+ Kxg4 2.Qe3 b5 3.axb5 a4 4.b6 axb3 5.b7 b2 6.b8Q Qh1+ 7.Kxh1 b1Q+ 8.Kg2
>Qb2+ 9.Kf1 Qa1+ 10.Kf2 Qf6+ 11.Ke2
>  +-  (11.75)   Depth: 15/47   00:00:18  12776kN, tb=14
>
>
>If I disable verfied null-move pruning, Falcon doesn't find the correct move.

Interesting... My engine (Ayito) definitely finds it very fast without
null-move, and Falcon is far far better than Ayito. Engines such as Ruffian or
Crafty (to name two) stick to gxh5 at depth 14, and don't find it after over 1
minute.


>I use verified null-move pruning (an improved version of it).

Maybe this is why your engine finds it. I'd like to get more input on this from
others.
I'll try the verified N.M one of these days.

Regards,

  Jaime

• Re: Another interesting Anti-Null move position (from a real game) Omid David Tabibi 15:30:07 06/14/04
  • Re: Another interesting Anti-Null move position (from a real game) Jaime Benito de Valle Ruiz 15:35:11 06/14/04

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