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Subject: Re: Kasparov-Ribli, 1989

Author: Bruce Moreland

Date: 15:13:53 03/19/99

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On March 19, 1999 at 15:27:42, Robert Hyatt wrote:

>On March 19, 1999 at 14:59:52, Peter McKenzie wrote:
>
>>On March 19, 1999 at 12:48:04, Bruce Moreland wrote:
>>
>>>5rk1/5ppp/p1Q1p3/1R6/q7/4b1P1/P2RPP1P/6K1 w - - 0 1
>>>
>>>The key is 1. Rd8, which Kasparov didn't find.
>>>
>>>It isn't hard to find for a computer, but I think they will typically think it
>>>is a draw.  Can anyone find a score that indicates *significant* advantage to
>>>white?
>>
>>Not me.
>>I let Chop run for about half an hour on this one, and it was still saying Rd8
>>with a 0.00 score at the end.
>>
>>>
>>>What this means in practice is, can anyone resolve (hopefully from the root) the
>>>near-perpetual after:
>>>
>>>1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
>>>
>>>bruce
>
>
>I searched this a while and got this:
>
>               11->  12.90   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
>                                    4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. Kg2
>               12    16.30   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
>                                    4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. Kg2
>               12->  26.07   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
>                                    4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. Kg2
>               13    35.13   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
>                                    4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. Kg2
>               13->  59.52   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
>                                    4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. Kg2
>               14     1:49   0.26   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
>                                    4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. g4 Qf1+
>                                    7. Kg3 Qg1+ 8. Kf3 Qf1+ 9. Ke3 Qh3+
>                                    10. Kd2 Qh6+ 11. e3 g5 12. Rxf8+ Qxf8
>                                    13. Qxa6
>               14->   2:28   0.26   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
>                                    4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. g4 Qf1+
>                                    7. Kg3 Qg1+ 8. Kf3 Qf1+ 9. Ke3 Qh3+
>                                    10. Kd2 Qh6+ 11. e3 g5 12. Rxf8+ Qxf8
>                                    13. Qxa6
>               15     3:25   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
>                                    4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. g4 Qf1+
>                                    7. Kg3 Qg1+ 8. Kf3 Qf1+ 9. Kg3
>               15->   6:17   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
>                                    4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. g4 Qf1+
>                                    7. Kg3 Qg1+ 8. Kf3 Qf1+ 9. Kg3
>               16     8:43   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
>                                    4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. g4 Qf1+
>                                    7. Kg3 Qg1+ 8. Kf3 Qf1+ 9. Kg3
>
>So for one brief moment at depth=14 I had a slightly + score, but it dropped
>back to 0.00
>
>Bob

If you let it go longer I predict that you will eventually get a fail high and
black will as a result play 1. ... Rxd8 instead of 1. ... Qxb5, allowing white
to win the queen, with a score of +2 or more.

1. ... Qxb5 does not lead to a perpetual check.

If you want to look it up, it is on page 180 of the Sep '93 ICCAJ.

bruce



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