Author: Robert Hyatt
Date: 12:44:05 07/09/01
Go up one level in this thread
On July 09, 2001 at 15:35:16, Kurt Widmann wrote:
>On July 09, 2001 at 14:06:01, Dieter Buerssner wrote:
>
>>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
>
>Hi Dieter,
>This is a very interesting revelation. Fritz6 plays Qc6 even at a depth
>of 14 ply,change of engine parameters has no affect on its fix for Qc6?
>Could I try to run your Yase program under fritz,shredder or winboard?
>It seems that your engine with an opening book equivalent to Fritz, could
>outsearch Fritz and be a legitimate challenger for all top programs. By the way,
>shredder5 finds Bxe6 in a few seconds also.
>Where is the best place to download your program,is it at Dann's place?
>Is it registered as a commercial product or a free demo?
>Regards,
>Kurt Widmann
Crafty doesn't see problems until depth=13, where it fails low. Takes 90
seconds to see that Qc6 leads to trouble, but this is on a quad 700...
Just goes to show that as I have said many times, tactics are not yet
"completely solved" by computers.
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