Author: Dann Corbit
Date: 17:44:38 01/04/99
Go up one level in this thread
On January 04, 1999 at 20:09:15, Eugene Nalimov wrote:
>On January 04, 1999 at 19:52:21, Dann Corbit wrote:
>
>>After having stepped through these end-games, I think that the problem is the
>>horizon effect. The draws are so far away, that they cannot be seen. Which
>>brings up an interesting question:
>>Do endgame tablebase files contain draw data *as well as* checkmate data, so
>>that when you are behind a draw could be discovered? This seems (to my feeble
>>way of thinking) to be just as valuable as checkmate data. If not, it seems
>>worthwhile to construct draw endgame tablebase files just as construction of
>>checkmate database files is valuable.
>
>Based on my understanding, any program that has access to
>the corresponding TB must declare those positions as draws
>(I myself have no chess program here, so I cannot check my
>statement).
After turning logging on, I see that Crafty did see that the position was drawn,
but is "trying for swindle":
White(1): setboard 8/6kP/5N2/5K2/8/8/8/8 w - -
White(1): go
end-game phase
clearing hash tables
Drawn at root, trying for swindle.
time surplus 0.00 time limit 12:50 (12:50)
depth time score variation (1)
6-> 0.07 6.91 1. Ke6 Kh8 2. Kd6 Kg7 3. Ke5 Kh8
7 0.07 6.91 1. Ke6 Kh8 2. Kd6 Kg7 3. Ke5 Kh8 4.
Ke6
7-> 0.14 6.91 1. Ke6 Kh8 2. Kd6 Kg7 3. Ke5 Kh8 4.
Ke6
8 0.16 6.99 1. Ke6 Kh8 2. Kd6 Kg7 3. Ke5 Kh8 4.
etc.
also:
White(1): setboard 5k2/6r1/4Q3/8/8/8/8/7K b - -
puzzling over a move to ponder.
end-game phase
clearing hash tables
depth time score variation (1)
Black(1): Rh7+ [pondering]
clearing hash tables
Drawn at root, trying for swindle.
time surplus 0.00 time limit 12:50 (12:50)
depth time score variation (1)
6-> 0.06 4.60 2. Kg2 Re7 3. Qf6+ Ke8 4. Kg3 Kd7 5.
Kf4
7 0.13 4.60 2. Kg2 Re7 3. Qf6+ Ke8 4. Kg3 Kd7 5.
Kf4 Re6
7-> 0.14 4.60 2. Kg2 Re7 3. Qf6+ Ke8 4. Kg3 Kd7 5.
Kf4 Re6
8 0.31 4.60 2. Kg2 Re7 3. Qf6+ Ke8 4. Kg3 Kd7 5.
Kf4 Re6 6. Qh8
8-> 0.41 4.60 2. Kg2 Re7 3. Qf6+ Ke8 4. Kg3 Kd7 5.
Kf4 Re6 6. Qh8
9 1.13 4.65 2. Kg2 Re7 3. Qf6+ Ke8 4. Kg3 Kd7 5.
Kf4 Re6 6. Qf7+ Kd6 7. Qg8
9-> 1.22 4.65 2. Kg2 Re7 3. Qf6+ Ke8 4. Kg3 Kd7 5.
Kf4 Re6 6. Qf7+ Kd6 7. Qg8
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