Author: Dieter Buerssner
Date: 11:41:10 01/10/06
Go up one level in this thread
On January 08, 2006 at 20:24:47, Vincent Lejeune wrote: >On January 08, 2006 at 12:33:15, Dieter Buerssner wrote: > >>On January 07, 2006 at 19:32:01, Vincent Lejeune wrote: >> >>>On January 07, 2006 at 14:39:32, Dieter Buerssner wrote: >>>... >>>>>1k3b1q/pP2p1p1/P1K1P1Pp/7P/2B5/8/8/8 w - - 0 1 bm Kd5; id Totally Paralysed; >>>> >>>>Found after 31 s, score +0.41 after 1:50, after 2:07 Bb5 with 0.42, not >>>>switching back to Kd5 within 5 minutes. Can you give some analysis? >>> >>>The best lines was posted some days ago : >>>http://www.talkchess.com/forums/1/message.html?477126 >> >>>1. Kd5 Kc7 2. Bb5 Qg8 3. Be8 Kb8 4. Bf7 Qh8 5. Kc6 Qg8 6. Kd7 Qh8 7. Ke8 Kc7 8. >>>b8=Q+ Kxb8 9. Kd7 Ka8 10. Kc8 Qg8 11. Kc7 Qxf7 12. gxf7 g5 13. hxg6 1-0 >> >>1. Bb5 wins, too. Yace after Bb5 (and a little bit of backwards analysis): >> >>23.01 0:46 -13.29 1...Dg8 2.Kd7 Dh8 3.Lc6 Dg8 4.La4 Dh8 >> 5.Kc6 Dg8 6.Kd5 Dh8 7.Le8 Dg8 8.Lf7 Dxf7 >> 9.exf7 e5 10.Kxe5 Lb4 11.Ke6 Kc7 >> 12.b8D+ Kxb8 13.Kd7 Lc5 14.Ke8 Kc7 (66.301.707) 1437 >> >>24/55 0:56 -13.69-- 1...Dg8 2.Kd7 Dh8 3.Lc6 Dg8 4.La4 Dh8 >> 5.Kc6 Dg8 6.Kd5 Df7 7.exf7 e5 8.Kc6 Le7 >> 9.Kd7 Lc5 10.Ke8 e4 11.f8D Lxf8 >> 12.Kxf8 Kc7 13.Kf7 e3 14.Lb5 Kb6 (82.528.097) 1471 >> >>In the analysis of the root position, positive score was seen; I guess in this >>position with such an material disadvantage, this means, that much of the line >>was "understood". >There's no point playing other main lines for white than Kd5-Bb5-Be8-Bf7 >Or you could consider the first sequence moves : >Kd5-Kd4-Kd3-Kd2-Kd1-Ke1-Ke2-Ke3-Ke4-Ke5 winning too Hmmm, I don't really agree - at least when testing a typical playing engine. Engines do not care for the fastest past to win, typically (unless they see a mate). Hash tables, and probably more typically used techniques, can yield in artefacts: engines may see a longer win faster than the shorter win. As long, as they will show you the win, this should not matter (for a test position). BTW. In this position: Isn't 1. Bb5 a simple transposition to the main line given by you? How could an engine show a positive score in this position, without "understanding"? Regards, Dieter
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