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Subject: Re: perpetual check

Author: Vincent Diepeveen

Date: 14:57:19 10/17/01

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On October 16, 2001 at 14:24:00, Robert Hyatt wrote:

The King already saw repetitions with 2 rooks 6 years ago
at peanut hardware.

And yes it simply selects teh right checks in qsearch and searches them
all in a smart way.

I do also in DIEP move repetition in qsearch, but i do not extend this
case. The King does, otherwise i would also get quickly the draw
score here.

Life gets a lot easier when you have move repetition also in qsearch.

>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...



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