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Subject: Re: test position - delaying the inevitable

Author: Lieven Clarisse

Date: 05:58:30 01/09/03

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On January 08, 2003 at 16:30:38, Jon Dart wrote:

>This position came up in an offline test game, Arasan 6.2 vs. Lambchop 10.88:
>
>[D] 1k6/q7/2Q5/r3pp2/6p1/8/5rPP/5RK1 w - -
>
>White can delay the inevitable with a series of checks, beginning with Qe8+, but
>eventually he will run out of checks and lose, I think. This is something that
>is typically hard for computers to see. Arasan (White) thought it was fine at
>this point.
>
>Crafty 18.10 fails low on this position at ply 13, but then it takes a long time
>to resolve the fail-low: I gave it 20 minutes on a Xeon 1.7GHz, and it was still
>searching.
>
>Pharaon gets a score of about -2.5 at ply 12, but it went up again on ply 13,
>and then like Crafty it just hangs at ply 14 for a really long time.
>
>--Jon

I let Ruffian play it with 10 minutes per move, black won

1. Qe8+ Kb7 2. Qd7+ Ka6 3. Qd3+ Kb6 4. Rxf2 Ra1+ 5. Rf1 Kc7+ 6. Kh1 Rxf1+ 7.
Qxf1 Qa2 8. Kg1 Qc2 9. Qb5 Qc3 10. Kf1 Kd6 11. Qa6+ Kd5 12. Ke2 Qc2+ 13. Ke1
Qc1+ 14. Ke2 Qc4+ 15. Qxc4+ Kxc4 16. h4 gxh3 17. gxh3 Kd5 18. Kf2 Ke4 19. h4 Kf4
{White resigns} 0-1





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