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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