Author: Andreas Stabel
Date: 00:22:04 10/10/03
Go up one level in this thread
On October 09, 2003 at 19:27:23, Jeremiah Penery wrote:
>On October 09, 2003 at 06:26:17, Andreas Stabel wrote:
>
>>On October 09, 2003 at 06:24:57, Andreas Stabel wrote:
>>
>>>In this article:
>>>http://www.chessbase.com/newsdetail.asp?newsid=1187
>>
>>Sorry - it should be:
>>[D]1rb2rk1/p1p3pp/2pb4/3p4/3Pp3/4B2q/PPPQBP1P/2KR3R b - - 0 17
>>>were are all challenged to find the answer to if 17... Rxf2 is the
>>>best move or not.
>>>
>>>This should be the perfect opportunity for us all to use our pooled
>>>knowlegde, computer power and programs to solve this one.
>
>I haven't really looked at it yet, but just started my computer on it in the
>morning before I left to work. This is what it shows now:
>
> 12 2:50 -1.03 1. ... Bb4 2. c3 Bd6 3. Rdg1 Bf5 4.
> Rg5 Rf7 5. Bh5 Rd7 6. Be2 Rf8 7. Bf4
> 12 5:40 -1.08 1. ... Rb4 2. a3 Rb7 3. Qa5 Be6 4.
> Qa4 Ra8 5. Bf1 Qf3 6. Ba6 Rb6 7. Qa5
> 12 8:45 -1.30 1. ... Rb6 2. Bf1 Qh4 3. c4 Bb4 4.
> Qc2 Bg4 5. Be2 Bd6 6. Bxg4 Qxg4 7.
> h3
> 12 17:50 ++ 1. ... Rxf2!!
> 12-> 18:43 -1.47 1. ... Rxf2
> 13 21:18 ++ 1. ... Rxf2!!
> 13 22:35 -1.89 1. ... Rxf2 2. Bxf2 Qa3 3. c3 Qxa2
> 4. b4 Qa1+ 5. Kc2 Qa4+ 6. Kc1 Rxb4
> 7. Qe3 Qa3+ 8. Kd2 Rb2+ 9. Ke1 Rc2
> 10. c4 dxc4 11. Qxe4
> 13-> 23:32 -1.89 1. ... Rxf2 2. Bxf2 Qa3 3. c3 Qxa2
> 4. b4 Qa1+ 5. Kc2 Qa4+ 6. Kc1 Rxb4
> 7. Qe3 Qa3+ 8. Kd2 Rb2+ 9. Ke1 Rc2
> 10. c4 dxc4 11. Qxe4
> 14 29:21 -2.08 1. ... Rxf2 2. Bxf2 Qa3 3. c3 Qxa2
> 4. b4 Qa1+ 5. Kc2 Qa4+ 6. Kc1 Rxb4
> 7. Qe3 Qa3+ 8. Kd2 Rb2+ 9. Ke1 Rc2
> 10. Bg3 Rxc3 11. Bxd6 cxd6
> 14-> 32:41 -2.08 1. ... Rxf2 2. Bxf2 Qa3 3. c3 Qxa2
> 4. b4 Qa1+ 5. Kc2 Qa4+ 6. Kc1 Rxb4
> 7. Qe3 Qa3+ 8. Kd2 Rb2+ 9. Ke1 Rc2
> 10. Bg3 Rxc3 11. Bxd6 cxd6
> 15 84:29 ++ 1. ... Rxf2!!
> 15 289:22 -3.25 1. ... Rxf2 2. Bxf2 Qa3 3. c3 Qxa2
> 4. b4 Qa1+ 5. Kc2 Qa4+ 6. Kc1 Rxb4
> 7. Qe3 Rb2 8. Kxb2 Ba3+ 9. Ka2 Bc1+
> 10. Kb1 Bxe3 11. Bxe3 Qb3+ 12. Kc1
> Qxc3+
> 15-> 292:12 -3.25 1. ... Rxf2 2. Bxf2 Qa3 3. c3 Qxa2
> 4. b4 Qa1+ 5. Kc2 Qa4+ 6. Kc1 Rxb4
> 7. Qe3 Rb2 8. Kxb2 Ba3+ 9. Ka2 Bc1+
> 10. Kb1 Bxe3 11. Bxe3 Qb3+ 12. Kc1
> Qxc3+
> 16 636:24 -3.15 1. ... Rxf2 2. Bxf2 Qa3 3. c3 Qxa2
> 4. b4 Qa1+ 5. Kc2 Qa4+ 6. Kc1 Rxb4
> 7. cxb4 Bxb4 8. Qb2 Ba3 9. Be3 Ba6
> 10. Bg4 Qc4+ 11. Kb1 Bxb2 12. Kxb2
> 16 712:00 14/51? 1. ... Kh8
>
>
> Elapsed Time: 712:12, CPU Time: 673:42, CPU Use: 94%
> Nodes: 12810388756, Evaluations: 628101471, FH%: 93%, NPS: 299k
> EXTENSIONS->
> Threat: 7207997, Check: 1050951850, One Move: 65055103
> Passed Pawn: 15073767, Recapture: 23593427
> PRUNING-> Futility: 3805147375, Razors: 223161990
> TABLEBASES-> Probes: 0, Successful: 0
> HASHING->
> Raw Hits: 9% (224113894/-1974073590)
> Good Hits: 9% (223203306/-1974073590)
> Pawn Hits: 98% (1113495247/1133869683)
> Filled: 99%
> EXACT Hits: 0% (1089)
> LOWER Hits: 7% (178480459)
> UPPER Hits: 1% (42564661)
>
>Modified Crafty, AthlonXP 1.6GHz
It is interessting to see that both you and Dan Ellwein find the move Rxf2
with big scores. If you read the article, yiu will see that even Kasparov
thinks Rxf2 is not the best move, but this is disputed.
I have let Ruffian run on the important position after
17... Rxf2 18. Bxf2 Qa3 19. c3 Qxa2 20. b4 Qa1+ 21. Kc2 Qa4+ 22. Kc1:
16--> 88:43 0.80 1. ... Bf5 2. Be1 a5 3. Qc2 Qa1+ 4. Qb1 Qa3+
5. Qb2 axb4 6. cxb4 Qa4 7. Qc2 Qa1+ 8. Qb1 Qa7
9. Bc3 Qa4 10. Rhf1 Bh3 11. Qc2
17/46 117:59 0.76 1. ... Bf5 2. Be1 e3 3. Qb2 a5 4. Rf1 Be4 5. Bd3
axb4 6. Bg3 Bxd3 7. Rxd3 Qb5 8. Qb1 b3 9. Kb2 Bxg3
10. hxg3 Re8
17/47 137:47 x.xx ... a5
17/47 165:12 ++ ... a5
17/47 190:32 1.33 1. ... a5 2. Qc2 Qa3+ 3. Qb2 axb4 4. Kc2 Ba6
5. Rd2 b3+ 6. Kd1 Bxe2+ 7. Rxe2 Ra8 8. Qxa3 Rxa3
9. Ree1 Bf4 10. Bg3 Ra1+ 11. Ke2 Ra2+ 12. Kd1 Rd2+
13. Kc1 b2+ 14. Kb1 Bxg3 15. hxg3 Rf2
17--> 217:58 1.33 1. ... a5 2. Qc2 Qa3+ 3. Qb2 axb4 4. Kc2 Ba6
5. Rd2 b3+ 6. Kd1 Bxe2+ 7. Rxe2 Ra8 8. Qxa3 Rxa3
9. Ree1 Bf4 10. Bg3 Ra1+ 11. Ke2 Ra2+ 12. Kd1 Rd2+
13. Kc1 b2+ 14. Kb1 Bxg3 15. hxg3 Rf2
18/48 222:53 -- ... a5
18/48 275:40 1.01 1. ... a5 2. Qc2 Qa3+ 3. Qb2 axb4 4. Qxa3 bxa3
5. Bg3 e3 6. Rhe1 a2
18--> 424:10 1.01 1. ... a5 2. Qc2 Qa3+ 3. Qb2 axb4 4. Qxa3 bxa3
5. Bg3 e3 6. Rhe1 a2
19/52 586:07 1.09 1. ... a5 2. Qc2 Qa3+ 3. Qb2 axb4 4. Qxa3 bxa3
5. Bg3 e3 6. Rhe1 a2 7. Kc2 Ba3 8. c4 c5 9. dxc5
Bf5+ 10. Bd3 Rb2+ 11. Kc3 Bxd3 12. Kxd3 Bxc5
13. cxd5
This seems much less conclusive.
Regards
Andreas
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.