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Subject: Re: perpetual check

Author: Robert Hyatt

Date: 11:24:00 10/16/01

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On October 16, 2001 at 11:13:38, John Merlino wrote:

>On October 16, 2001 at 07:58:15, Steffen Jakob wrote:
>
>>Hi,
>>
>>this is a position from a blitz game Hossa - Sjeng:
>>
>>[D]7k/4QP2/7p/6rP/8/1K6/6r1/8 b
>>
>>For a human it's obvious that this is a draw. Hossa was rather clueless and
>>thought that white was winning. Are there any engines which show a draw value at
>>once (without significant search depth)?
>>
>>Greetings,
>>Steffen.
>
>Chessmaster 8000 sees the draw in less than a second:
>
>Time	Depth	Score	Positions	Moves
>0:00	1/3	1.18	7319		1...R2g3+ 2. Kc2 Rg2+ 3. Kd3 R2g3+
>					4. Kc4 R3g4+ 5. Kc3 Rg3+ 6. Kb2
>					Rg2+ 7. Kc1 Rg1+ 8. Kd2 R1g2+ 9.
>					Ke3
>0:00	2/4	0.95	23824		1...R2g3+ 2. Kc2 Rg2+ 3. Kd3 R2g3+
>					4. Kc4 R3g4+ 5. Kc3 Rg3+ 6. Kb2
>					Rg2+ 7. Kc1 Rg1+ 8. Kd2 R1g2+ 9.
>					Ke3 R2g3+ 10. Ke2 Rg2+ 11. Kf1
>					Rg1+ 12. Kf2
>0:00	3/5	0.00	45109		1...R2g3+ 2. Kc2 Rg2+ 3. Kd3 R2g3+
>					4. Kc4 R3g4+ 5. Kc3 Rg3+ 6. Kb2
>					Rg2+ 7. Kc1 Rg1+ 8. Kd2 R1g2+ 9.
>					Ke3 R2g3+ 10. Ke2 Rg2+ 11. Kf1
>					Rg1+ 12. Kf2 R1g2+ 13. Ke3
>0:01	4/6	0.00	110883		1...R2g3+ 2. Kc2 Rg2+ 3. Kd3 R2g3+
>					4. Kc4 R3g4+ 5. Kc3 Rg3+ 6. Kb2
>					Rg2+ 7. Kc1 Rg1+ 8. Kd2 R1g2+ 9.
>					Ke3 R2g3+ 10. Ke2 Rg2+ 11. Kf1
>					Rg1+ 12. Kf2 R1g2+ 13. Ke3
>0:02	5/7	0.00	246089		1...R2g3+ 2. Kc2 Rg2+ 3. Kd3 R2g3+
>					4. Kc4 R3g4+ 5. Kc3 Rg3+ 6. Kb2
>					Rg2+ 7. Kc1 Rg1+ 8. Kd2 R1g2+ 9.
>					Ke3 R2g3+ 10. Ke2 Rg2+ 11. Kf1
>					Rg1+ 12. Kf2 R1g2+ 13. Ke3
>0:04	6/8	0.00	498686		1...R2g3+ 2. Kc2 Rg2+ 3. Kd3 R2g3+
>					4. Kc4 R3g4+ 5. Kc3 Rg3+ 6. Kb2
>					Rg2+ 7. Kc1 Rg1+ 8. Kd2 R1g2+ 9.
>					Ke3 R2g3+ 10. Ke2 Rg2+ 11. Kf1
>					Rg1+ 12. Kf2 R1g2+ 13. Ke3
>0:08	7/9	0.00	1039196		1...R2g3+ 2. Kc2 Rg2+ 3. Kd3 R2g3+
>					4. Kc4 R3g4+ 5. Kc3 Rg3+ 6. Kb2
>					Rg2+ 7. Kc1 Rg1+ 8. Kd2 R1g2+ 9.
>					Ke3 R2g3+ 10. Ke2 Rg2+ 11. Kf1
>					Rg1+ 12. Kf2 R1g2+ 13. Ke3
>0:16	8/10	0.00	2092486		1...R2g3+ 2. Kc2 Rg2+ 3. Kd3 R2g3+
>					4. Kc4 R3g4+ 5. Kc3 Rg3+ 6. Kb2
>					Rg2+ 7. Kc1 Rg1+ 8. Kd2 R1g2+ 9.
>					Ke3 R2g3+ 10. Ke2 Rg2+ 11. Kf1
>					Rg1+ 12. Kf2 R1g2+ 13. Ke3
>
>jm


It isn't seeing "the draw".  It is seeing "a draw".  "the draw" is way deep
here.  "the draw" is probably beyond 40 plies deep.  I think this is a
function of one side thinking it wants a draw when it doesn't, and the
otherside wanting a draw when it shouldn't...

• Re: perpetual check Vincent Diepeveen 14:57:19 10/17/01
  • Re: perpetual check Robert Hyatt 05:56:05 10/18/01
• Re: perpetual check Uri Blass 13:02:42 10/16/01
  • Re: perpetual check John Merlino 14:50:12 10/16/01
  • Re: perpetual check Robert Hyatt 14:05:01 10/16/01
  • Re: perpetual check Miguel A. Ballicora 13:39:07 10/16/01
    • Re: perpetual check Robert Hyatt 14:10:39 10/16/01
      • Re: perpetual check Robert Hyatt 14:58:56 10/16/01
        • Re: perpetual check Dan Andersson 16:27:56 10/16/01
          • Re: perpetual check Robert Hyatt 19:18:12 10/16/01
            • Re: perpetual check Peter Fendrich 02:03:19 10/17/01
              • Re: perpetual check Robert Hyatt 08:29:43 10/17/01

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