Author: Kolss
Date: 04:33:26 03/08/02
Go up one level in this thread
On March 08, 2002 at 00:40:01, Dieter Buerssner wrote: >On March 07, 2002 at 22:50:05, Robert Hyatt wrote: > >>On March 07, 2002 at 22:45:55, Dieter Buerssner wrote: >> >>> 5b1k/3R4/5P2/p1rB4/8/8/6K1/8 b - - >>> > >>>Perhaps I am too naive, but when I watched this game, I first was confident, >>>that it should be a very easy draw. My (stupid?) reasoning was: A computer will >>>not lose KRBKR (when he does not see the exceptional win fast). The position >>>here is KRBPKRBP. The Bs are of opposite color. So, I thought, it should allways >>>be possible, to sac one B for a P, and have an easy draw. Well, I was totally >>>wrong, and so was the knowledge I coded into my engine. >>> >>>How long does your engine need, to avoid a4? How long does it need, to see a >>>convincing winning score after a4? (Kg3 is a forced win, other moves perhaps, >>>too). > >>Crafty decides a4 is not so good pretty quickly (on my laptop here)... > >Yes. > >> 12-> 58.63 1.45 1. ... Rb5 2. Rd8 Kh7 3. Be4+ Kg8 4. >> Rd7 Rb2+ 5. Kg3 Rb6 6. Bd5+ Kh8 7. >> Rf7 Bc5 8. Kf4 a4 > >This will draw. > >>If you force a4 and let it search for white: >> >> 11-> 19.99 2.18 2. Kf3 Rc1 3. Kf4 Rf1+ 4. Kg5 Re1 5. >> Kg6 Rg1+ 6. Kf7 Bc5 7. Rd8+ Kh7 8. >> Be4+ Kh6 9. Ke6 > >While the score does not look too convincing yet, Kf3 will win. > >Thanks for all the answers. However, I'd also be interested in comments about >the "knowledge" above. Was this just bad luck? Or is it just stupid to assume, >that KRBPKRBP with Bs of opposite color should be draw? Well, what do you mean by "draw" - 0.00? That is dangerous, since the program will not make any progress, and moreover, it will not see that the opponent can make progress - which can often be deadly, as is the case here. Regards, Munjong. > >Regards, >Dieter
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