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Subject: Re: Interesting position

Author: William Bryant

Date: 20:47:35 08/13/99

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On August 13, 1999 at 03:10:30, James Robertson wrote:

>Today my program encountered JPCrafty in a computer tournament at FICS. In this
>position:
>
>r1b2rk1/4b2p/p1p1p2Q/2q1ppN1/8/8/4B1PP/3R1RK1 w - - id JPCrafty - JRCP, 1999;
>

My program likes Rf2 but doesn't see a draw

  3      1031     0:00   -5.25  Rf2 Bxg5 Qxg5+ Kh8
  4      2882     0:00   -5.20  Rf2 Bxg5 Qxg5+ Kh8 Bd3
  5     14972     0:00   -5.30  Rf2 Bxg5 Qxg5+ Kh8 Rc1 Qd6
  6     35002     0:00   -5.25  Rf2 Bxg5 Qxg5+ Kh8 Rc1 Qd6 Bc4
  7    147262     0:02   -5.05  Rf2 Bxg5 Qxg5+ Kh8 Rd8 e4 Qf6+ Kg8 Rxc8 Rfxc8
Qxe6+ Kh8 Bxa6
  8    556161     0:10   -5.05  Rf2 Bxg5 Qxg5+ Kh8 Rd8 e4 Qf6+ Kg8 Rxc8 Rfxc8
Qxe6+ Kh8 Bxa6
  9   2971241     0:51   -4.34  Rf2 Bxg5 Qxg5+ Kh8 Rd8 Rxd8 Qxd8+ Kg7 Bxa6 Qc1+
Bf1 e4
 10   6658309     1:56   -4.16  Rf2 Bxg5 Qxg5+ Kh8 Bf3 Rb8 Rc1 Qd4 Bxc6 e4 Qh6
 11  14467904     4:12   -4.34  Rf2 Bxg5 Qxg5+ Kh8 Rd8 Rxd8 Qxd8+ Kg7 Qg5+ Kh8
Qd8+

How are you detecting a draw by perpetual check?

Are you looking for a three fold repetition created by the checks or by another
method.

This is a weakness of my program I would like to fix.

William
wbryant@ix.netcom.com



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