Author: David Dory
Date: 01:00:04 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?
>
>Regards,
>Dieter
No, it's not bad LUCK. While the position has drawish material balance, the
placement of those pieces on the board, really favor WHITE. The Bking is stuck
in the corner with WHITE'S rook on his 7th row, ("like a stick in your throat"
is the expression, I believe), the Bpawn has NO support yet.
WHITE'S bishop is aiming a laser right next to the Bking. BLACK'S bishop
meanwhile, sits on the edge of the board like a paperweight, almost.
Meanwhile the Wking - he has unblocked ACRES he may choose to move to.
The onus is on BLACK to hold this to a draw, and, IMHO, BLACK must give his
pieces more active placement and/or exchange pieces quickly, or lose.
Dave
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