Author: Robert Hyatt
Date: 08:02:06 03/26/03
Go up one level in this thread
On March 26, 2003 at 06:28:52, Peter Berger wrote:
>These can be tough or very easy depending on engine - some engines seem to know
>too much here. They are also interesting for humans I think.
>
>[D]6k1/p4p2/6p1/1P2p2p/4q2P/4Q1P1/P4P2/6K1 b - - 0 1
>
>1..Qxe3! wins for black.
I don't think these are about "knowledge". They are about "search" since the
first position
has blacking giving white an outside passed pawn with the two to one majority on
the
queenside. However search shows a different result:
16 1:39 -0.38 1. ... Qxe3 2. fxe3 Kf8 3. a4 Ke7 4.
a5 Kd6 5. Kf2 Kc5 6. b6 axb6 7. a6
Kc6 8. e4 b5 9. Ke3 b4
16-> 1:39 -0.38 1. ... Qxe3 2. fxe3 Kf8 3. a4 Ke7 4.
a5 Kd6 5. Kf2 Kc5 6. b6 axb6 7. a6
Kc6 8. e4 b5 9. Ke3 b4 (s=2)
17 1:40 ++ 1. ... Qxe3!!
17 1:48 -0.96 1. ... Qxe3 2. fxe3 Kf8 3. Kg2 Ke7
4. Kf3 Kd6 5. g4 f5 6. gxf5 gxf5 7.
a4 Kc5 8. Ke2 e4 9. Kd2 Kb4 10. Ke2
Kxa4
17-> 1:52 -0.96 1. ... Qxe3 2. fxe3 Kf8 3. Kg2 Ke7
4. Kf3 Kd6 5. g4 f5 6. gxf5 gxf5 7.
a4 Kc5 8. Ke2 e4 9. Kd2 Kb4 10. Ke2
Kxa4 (s=2)
18 2:08 -1.28 1. ... Qxe3 2. fxe3 Kf8 3. a4 Ke7 4.
Kf2 Kd6 5. a5 Kc5 6. b6 axb6 <HT>
18-> 2:16 -1.28 1. ... Qxe3 2. fxe3 Kf8 3. a4 Ke7 4.
Kf2 Kd6 5. a5 Kc5 6. b6 axb6 <HT>
>
>
>The second one is also interesting:
>
>[D]6k1/p4p2/6p1/1P2p2p/4q2P/4Q1P1/P4P2/5K2 b - - 0 1
>
Never shows Qxe3 in the PV here, for the same reason as above, it doesn't like
giving white that 2-1 majority if search doesn't find some really compelling
reason
to do so.
>1..Qxe3?? loses for black.
>
>Source: Blitzgame Yace-Crafty,D. Bürßner,A. Williams - ICC discussion
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