Author: Terry McCracken
Date: 08:52:24 10/31/01
Go up one level in this thread
On October 31, 2001 at 09:29:24, Paul wrote: >On October 31, 2001 at 03:28:12, Terry McCracken wrote: > >>On October 30, 2001 at 19:49:30, John Merlino wrote: >> >>>On October 30, 2001 at 18:24:41, Terry McCracken wrote: >>> >>>>[D]r5k1/ppp2r1p/3p3b/3Pn3/1n2PPp1/1P2K1P1/PBB1N2q/R2Q3R B >>>> >>>> >>>>How do your programmes evaluate this position? >>>>Do they find forced mate? >>>> >>>>Terry >>> >>>CM8000 does not find the mate in under 10 minutes on my PIII-600. It sees: >>> >>>1...Rxf4 2.Rxh2 Rf3+ 3.Kd4 c5+ 4.dxc6ep b5 5.Bd3 Nexc6+ 6.Kc3 Bg7+ 7.Kd2 Rxd3+ >>>8.Ke1 >>> >>>with an eval of -1.79. Is this the right line, and CM just hasn't seen far >>>enough yet? Is there really a forced mate? >>> >>Yes it is! Fritz with help finds a mate in 14, it was shorter in the >>actual game. >> >>I did this quickly so a shorter mate may exist? >> >> >>1...Rf4! 2.Rxh2..Rf3+ 3.Kd4..Bg7!!4.Rxh7..Rxh7 5.Ng1..c5+ 6.dxc ep. ..Nbc6+ >>7.Kd5..Nb4+ 8.Kd4..Ned3+ 9.e5..Bxe5+ 10.Kc4..Rc8+ 11.Kb5..Rc5+ 12.Ka4..Nxb2+ >>13.Kxb4..Bc3# >>>jm >>But mate it is! >> >> Terry > >Hi Terry, > >First the good news ... I like this wonderfully complex position, and already >looked at it with my program a couple of times in the past. In the game, > >1. d4 Nf6 2. c4 d6 3. Nc3 e5 4. e4 exd4 5. Qxd4 Nc6 6. Qd2 g6 7. b3 Bg7 8. Bb2 >O-O 9. Bd3 Ng4 10. Nge2 Qh4 11. Ng3 Nge5 12. O-O f5 13. f3 Bh6 14. Qd1 f4 15. >Nge2 g5 16. Nd5 g4 17. g3 fxg3 18. hxg3 Qh3 19. f4 Be6 20. Bc2 Rf7 21. Kf2 Qh2 >22. Ke3 Bxd5 23. cxd5 Nb4 24. Rh1 Rxf4 25. Rxh2 Rf3 26. Kd4 Bg7 27. a4 c5 28. >dxc6 bxc6 29. Bd3 Nexd3 30. Kc4 d5 31. exd5 cxd5 32. Kb5 Rb8 33. Ka5 Nc6 > >white didn't choose the "best" defense: 27. a4? leads to a mate in 8. > >The bad news is, I never found a mate, and secondly, I think your line above is >not totally correct ... unless I missed something (again ;), you gave: > >1...Rf4! 2.Rxh2..Rf3+ 3.Kd4..Bg7!!4.Rxh7..Rxh7 5.Ng1..c5+ 6.dxc ep. ..Nbc6+ >7.Kd5..Nb4+ 8.Kd4..Ned3+ 9.e5..Bxe5+ 10.Kc4..Rc8+ 11.Kb5..Rc5+ 12.Ka4..Nxb2+ >13.Kxb4..Bc3# > >You probably mean 4... Kxh7, but even then 12... Nxb2+ is not possible because >of a pin. Do you agree with that? > >Also, for ex, 8. Kd4 is not the best move (it leads to a mate in 11 ... Ned3+ e5 >Bxe5+ Kc4 d5+ Kb5 a6+ Ka5 b6+ Kxb6 Rb8+ Ka5 Nc6+ Kxa6 Nb4+ Ka5 Bc7+ Ka4 Ra8+ Kb5 >Ra5#), Kxd6 is tougher. Further 10... Rc8+ is not the best, d5+ is better. > >In short ... it really is a difficult position, it's not a mate in 13, and mine >still doesn't solve it. > >Groetjes, >Paul No I meant Rxh7 and yes the Black N can capture the White B on b2 giving +. I will analize this position further but it's a forced mate as far as I can tell. But I'll really look at it hard latter. Thanks for the compliment of choosing this position!:) I choose it for these reasons, it's beautiful, wild, complicated and it would play hell with the programmes;-) Regards, Terry
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