Author: Dieter Buerssner
Date: 11:06:01 07/09/01
Go up one level in this thread
On July 09, 2001 at 11:14:35, Kurt Widmann wrote:
>How deep do both have to search before dropping 9... Qc6?? for Bxe6! instead?
>Fritz 6 [B02]
>09.07.2001
>
>1.e4 Nf6 2.e5 Nd5 3.Nf3 d6 4.Bc4 Nb6 5.Bxf7+ Kxf7 6.Ng5+ Kg8 7.Qf3 Qe8 8.e6 g6
>9.Nf7* Qc6 10.Nh6+ Kg7 11.Qf7+ Kxh6 12.d3+ Kh5 13.g4+ Kh4 14.Rg1 Qb5 15.Nd2 Qa5
>16.Qf4 Qb4 17.Qxb4 Kg5 18.Qd4 Kh4 19.Nf3+ Kh3 20.Rg3# 1-0
>
>Do other programs have the same proplem?
Yace on AMD K6-2 475 with 35 M hash needs 75 seconds to switch to Bxe6:
nodes time score depth
4995317 26.566 1.84 9. 9...Qc6 10. Qg4 Qxc2 11. Na3 Qf5 12. Qxf5 gxf5
13. Nxh8 Kxh8 14. Nb5 {190}
12185259 1:03.2 1.44 10-- 9...Qc6 10. Nh6+ Kg7 11. Qf7+ Kxh6 12. d4+ Kh5
13. g4+ Kh4 14. Bg5+ Kxg5 15. h4+ Kxg4 16. Rg1+
Kh5 17. Qf4 Qh1 18. Rxh1 g5 19. hxg5+ Kg6 {-41}
13822728 1:12.0 0.64 10t 9...Qc6 10. Nh6+ Kg7 11. Qf7+ Kxh6 12. d4+ Kh5
13. g4+ Kh4 14. Bg5+ Kh3 15. Qf4 Qxh1+ 16. Ke2
Qe1+ 17. Kxe1 Kg2 18. Qf7 Nc6 {109}
14275398 1:15.1 0.65 10t+ 9...Bxe6 10. Nxh8 Kxh8 11. O-O
16798952 1:34.4 1.73 10t 9...Bxe6 10. Nxh8 Kxh8 11. Nc3 Nc6 12. O-O Qf7
13. Qe4 Bf5 14. Qf4 Bg7 {190}
17736647 1:42.0 1.73 10. 9...Bxe6 10. Nxh8 Kxh8 11. Nc3 Nc6 12. O-O Qf7
13. Qe4 Bf5 14. Qf4 Bg7 {190}
22714576 2:21.1 1.64 11t 9...Bxe6 10. Nxh8 Kxh8 11. O-O Nc6 12. Qe3 Qf7
13. Re1 Bxa2 14. b3 {HT} {270}
26133781 2:44.5 1.64 11. 9...Bxe6 10. Nxh8 Kxh8 11. O-O Nc6 12. Qe3 Qf7
13. Re1 Bxa2 14. b3 {HT} {270}
Yace thinks (but cannot prove) that Black gets "only" mated in the 21st move,
when analysing from back to front:
9406323 36.321 Mat12 12. 10. Nh6+ Kg7 11. Qf7+ Kxh6 12. d3+ Kh5 13. g4+
Kh4 14. Rg1 Qd5 15. Nd2 Qe5+ 16. Kf1 Nc4 17.
Nf3+ Kh3 18. Nxe5 Nd2+ 19. Bxd2 dxe5 20. Qf3+
Kxh2 21. Qg3# {311}
Perhaps Chest or some other programs can prove this?
Regards,
Dieter
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