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Subject: can a program see this perpetual check?

Author: blass uri

Date: 22:51:04 06/02/99

2R5/p3k3/1p2qrpp/1P2Q3/8/4PP1P/5K2/8 w - - 0 1

This position is from the ssdf games

Junior5(P200) did a mistake 62.Qb8 and Rebel8(P90) forced a perpetual check by
Rxf3+ 63.Kxf3 Qxh3+ 64.Kf2 Qf5+ 65.Ke1  Qb1+ 66.Kd2 Qb2+ 67.Kd1 Qb1+ 68.Ke2
Qxb5+ 69.Kd2 Qb4+ 70.Kd3 Qb3+ 71.Ke4(The evaluation of Junior when it played
71.Ke4 is 0.00 and Fritz can see the perpetual even earlier but not at move 62)

I think that white has good chances to win after 62.Rc7+ with trading queens
instead of 62.Qb8

Can a program find 62.Qb8 or find a better defence for white to prevent the
perpetual check?

I think that it is a perpetual but I was too lazy to do a table of positions
that white cannot escape from them without losing the rook or the queen.

Uri

• Re: can a program see this perpetual check? Howard Exner 19:59:50 06/03/99
  • Re: can a program see this perpetual check? blass uri 00:22:39 06/04/99
    • Re: can a program see this perpetual check? Howard Exner 03:48:00 06/04/99
    • Re: can a program see this perpetual check? blass uri 01:34:32 06/04/99
• LGG2 finds it immediately (0 seconds)! Jouni Uski 00:31:44 06/03/99
  • Re: LGG2 finds it immediately (0 seconds)! blass uri 00:57:50 06/03/99
    • Re: LGG2 finds it immediately (0 seconds)! Jouni Uski 02:19:07 06/03/99
      • Re: LGG2 finds it immediately (0 seconds)! blass uri 06:44:39 06/03/99
        • Re: LGG2 finds it immediately (0 seconds)! blass uri 08:54:54 06/03/99

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