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Subject: Re: White to Play and win in 13 moves !

Author: Dieter Buerssner

Date: 14:35:25 04/18/03

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On April 18, 2003 at 15:46:04, Jorge Pichard wrote:

> 8/6Q1/8/1R5p/8/4r3/8/1K1kq3 w - - 0 1

Yace does not find a mate within an hour, but at least a rather convincing
score:

[nodes      time     score depth]
  90238839  1:56.1   0.00 11.  1. Qg2 Re2 2. Qd5+ Rd2 3. Qxh5+ Qe2 4. Qxe2+
                               {EGTB} 4...Rxe2 5. Rc5 Rf2 6. Rd5+ Rd2 7. Re5
                               Re2 8. Rf5 Rg2 9. Rh5 Rg3 10. Rh6 Rg4 11. Rh7
                               Rg5 12. Rh8 Rg6 13. Rf8 Rh6 14. Rg8 Rh7 15. Rf8
                               Rg7 16. Rh8 Rf7 17. Rg8 Rh7 18. Rf8 Rg7 19. Rh8
                               Rf7 20. Rg8 Rh7 {repetition} {0}
 106141646  2:26.1   0.01 12t  1. Qg2 Re2 2. Rd5+ Rd2 3. Rd8 {HT}
 328388697  7:35.7   0.01 12.  1. Qg2 Re2 2. Rd5+ Rd2 3. Rd8
 341239835  7:55.1   0.41 13++ 1. Qg2 Re2 2. Rd5+ Rd2 3. Rd8 Qe2 4. Qh1+ Qe1
                               5. Qxh5+ Qe2 6. Qh1+ Qe1 7. Qf3+ Qe2 8. Qc6 Qe3
                               9. Qa4+ Ke2 10. Re8 Rd4 11. Rxe3+ Kd2 12. Qa2+
                               Kxe3 {501}
 343566389  7:58.0   1.41 13++ 1. Qg2 Re2 2. Rd5+ Rd2 3. Rd8 h4 4. Qg4+ Qe2 5.
                               Qa4+ Ke1 6. Qxh4+ Kd1 7. Qh1+ Qe1 8. Qf3+ Qe2
                               9. Qc6 Qe3 10. Qa4+ Ke2 11. Re8 Rd4 12. Rxe3+
                               Kf2 13. Qa2+ Kxe3 {501}
 345247243  8:00.9   6.41 13++ 1. Qg2 Re2 2. Rd5+ Rd2 3. Rd8 h4 4. Qg4+ Qe2 5.
                               Qa4+ Ke1 6. Qxh4+ Kd1 7. Qh1+ Qe1 8. Qf3+ Qe2
                               9. Qc6 Qe3 10. Qa4+ Ke2 11. Re8 Rd4 12. Rxe3+
                               Kf2 13. Qa2+ Kf1 {1001}
 353650188  8:12.2   9.95 13t  1. Qg2 Re2 2. Rd5+ Rd2 3. Rd8 h4 4. Qg4+ Qe2 5.
                               Qa4+ Ke1 6. Qxh4+ Kd1 7. Qh1+ Qe1 8. Qf3+ Qe2
                               9. Qc6 Qe3 10. Qa4+ Ke2 11. Re8 Kf2 12. Rxe3
                               Kg1 13. Qc2 Rd8 {HT}
 934614742 20:41.5   9.95 13.  1. Qg2 Re2 2. Rd5+ Rd2 3. Rd8 h4 4. Qg4+ Qe2 5.
                               Qa4+ Ke1 6. Qxh4+ Kd1 7. Qh1+ Qe1 8. Qf3+ Qe2
                               9. Qc6 Qe3 10. Qa4+ Ke2 11. Re8 Kf2 12. Rxe3
                               Kg1 13. Qc2 Rd8
 948156524 20:59.9  10.35 14++ 1. Qg2 Re2 2. Rd5+ Rd2 3. Rd8 h4 4. Qg4+ Qe2 5.
                               Qa4+ Ke1 6. Qxh4+ Kd1 7. Qh1+ Qe1 8. Qf3+ Qe2
                               9. Qc6 Qe3 10. Qa4+ Ke2 11. Re8 Rc2 12. Rxe3+
                               Kd1
 948446295 21:00.4  11.35 14++ 1. Qg2 Re2 2. Rd5+ Rd2 3. Rd8 h4 4. Qg4+ Qe2 5.
                               Qa4+ Ke1 6. Qxh4+ Kd1 7. Qh1+ Qe1 8. Qf3+ Qe2
                               9. Qc6 Qe3 10. Qa4+ Ke2 11. Re8 Rb2+ 12. Kxb2
                               Kd3 13. Rxe3+ Kd2
 949512300 21:02.0  16.35 14++ 1. Qg2 Re2 2. Rd5+ Rd2 3. Rd8 h4 4. Qg4+ Qe2 5.
                               Qa4+ Ke1 6. Qxh4+ Kd1 7. Qh1+ Qe1 8. Qf3+ Qe2
                               9. Qc6 Qe3 10. Qa4+ Ke2 11. Re8 Rb2+ 12. Kxb2
                               Kd3 13. Rxe3+ Kd2
 984626898 21:47.3  18.97 14t  1. Qg2 Re2 2. Rd5+ Rd2 3. Rd8 h4 4. Qg4+ Qe2 5.
                               Qa4+ Ke1 6. Qxh4+ Kd1 7. Qh1+ Qe1 8. Qf3+ Qe2
                               9. Qc6 Qe1 10. Qc1+ Ke2 11. Re8+ Kf3 12. Rxe1
                               Rd8 13. Qd1+ Kf4 14. Qxd8 Kf5 {1501}


With such a good score, Yace will also not try hard to find a mate (it tries
hard to find a good move for the losing side, instead).

Regards,
Dieter



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