Author: Simon Finn
Date: 10:48:00 10/12/01
Go up one level in this thread
On October 12, 2001 at 13:01:35, Dann Corbit wrote:
>Four positions from a pawn test suite I am working on...
>The first three have clear, alternate checkmates.
>The last one, I have not been able to solve yet (maybe just really hard).
>
>Questions:
>
>Are the *given* solutions correct (Ke6, Kd2, and Kf6 respectively) for the first
>3 problems?
The first two positions are structurally won i.e. any king move
will win, if correctly followed up. You would have to consult
the KPPKP database (which I don't have) to determine which move(s)
give the minimum mate i.e. whether the quoted alternatives are
as good as Yace's move.
For the third position, we're pretty confident.
After 1...Kf6 2. Kf4 Ke6 3. Ke3 Ke4 4. Kf3, 4...h5! is mate in 30
(according to Yace). White deviations from this line also lose
quickly.
>
>On the 4th problem, is the solution known to be solid?
The 4th position is a draw.
The position is Esser-Davidson (Amsterdam 1910) with colours reversed
(and transposed from the king-side to the queen-side).
The Enclopaedia of Chess Endgames (position 511) quotes analysis
by Reti that show how Black should defend:
1. c5!? bxc5 2. Kb5 Kc8 3. a4 Kb7 4. b3 c6 5. dxc6+ Kc7 6. Kxa5 Kxc6 =
3. Kxa5 c6 4. dxc6 d5 5. Kb5 d4 6. Kc4 Kc7 =
Esser blundered with 3...Kd7? and lost.
1. b5 (and other moves) also draw, so this position is not a good test.
Simon
>
>[D]8/8/1k1K4/pP6/P7/8/8/8 w - - bm Ke6 Kd5; id "J&S43.12"; c0 "Kd5 is a mate in
>19 as shown by Yace";
>
>[D]8/8/8/4kPp1/6P1/4K3/8/8 w - - bm Kd2 Ke2; id "J&S43.13"; c0 "Ke2 is a mate in
>21 as shown by Yace";
>
>[D]8/5p2/7p/5pk1/8/5KPP/8/8 b - - bm Kf6 h5; id "(JAFM) CCC#191597"; c0 "h5 is a
>mate in 43 according to Yace";
>
>
>[D]3k4/2p5/1pKp4/p2P4/2P5/P7/1P6/8 w - - bm c5; id "J&S45.10"; c0 "This one is
>questionable.";
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