Author: Miguel A. Ballicora
Date: 09:24:06 07/20/01
Go up one level in this thread
On July 20, 2001 at 11:39:06, Adam Oellermann wrote:
>
>>Do you mean the Fine #70 endgame position?
>>Here is it:
>>
>[D]8/k7/3p4/p2P1p2/P2P1P2/8/8/K7 w - - 0 1
>>
>>solution starts with 1.Kb1 Kb7 2.Kc1
>>
>>Rafael B. Andrist
>
>Yup, that's the one. Any info on what depth is required to solve it, and how
>long it might take?
Anything from 18 to 26 plies is ok (B. Hyatt posted this) . It varies according
to the program, and it should take few seconds, may be less than a second in
most computers to go for Kb1. In a PIII 700mhz 16 Mb Hash table mine takes 0.2 s
to reach ply 21 which is the first one that chooses Kb1. Later, I had a big
increase in score at ply 26.
My program has almost no knowledge relevant to this endgame (just centralization
of the king and material since there are no passed pawns) so I guess it would be
interesting for you to compare.
I posted long time ago (January this year I think) some experiments I did
with this position and some combinations of hashtable schemes and evaluation
functions. I believe that you might find it useful, sometimes you might find
the solution is less plies but in longer time!
This is the output (Gaviota 0.2.2)
Ply seconds score PV
18: 0.1 +0.62 Ka1-b2 Ka7-b6 Kb2-c3 Kb6-c7 Kc3-c4 Kc7-b6
Kc4-d3 Kb6-c7 Kd3-c3 Kc7-b7 Kc3-d2 Kb7-c8
Kd2-c2 Kc8-d7 Kc2-b2 Kd7-c7 Kb2-b3 Kc7-b6
19 0.1 +0.62 Ka1-b2 Ka7-b8 Kb2-c3 Kb8-b7 Kc3-d2
19: 0.1 +0.62 Ka1-b2 Ka7-b8 Kb2-c3 Kb8-b7 Kc3-d2
20 0.1 +0.62 Ka1-b2 Ka7-a8 Kb2-c3 Ka8-b7 Kc3-d2
20: 0.1 +0.62 Ka1-b2 Ka7-a8 Kb2-c3 Ka8-b7 Kc3-d2
21 0.1 +0.62 Ka1-b2 Ka7-a8 Kb2-c3 Ka8-b7 Kc3-d2 Kb7-c8
Kd2-c2 Kc8-b8 Kc2-d3 Kb8-c7 Kd3-e3 Kc7-d7
Ke3-e2 Kd7-d8 Ke2-f3 Kd8-e7 Kf3-g3 Ke7-f6
Kg3-h4 Kf6-g6 Kh4-g3
21 0.2 +0.68 Ka1-b1 Ka7-b7 Kb1-c1 Kb7-c7 Kc1-d1 Kc7-d7
Kd1-c2 Kd7-e7 Kc2-d3 Ke7-f7 Kd3-c4 Kf7-g6
Kc4-b5 Kg6-h5 Kb5-c6 Kh5-g4 Kc6xd6 Kg4xf4
Kd6-c5 Kf4-e4 d5-d6
21: 0.2 +0.68 Ka1-b1 Ka7-b7 Kb1-c1 Kb7-c7 Kc1-d1 Kc7-d7
Kd1-c2 Kd7-e7 Kc2-d3 Ke7-f7 Kd3-c4 Kf7-g6
Kc4-b5 Kg6-h5 Kb5-c6 Kh5-g4 Kc6xd6 Kg4xf4
Kd6-c5 Kf4-e4 d5-d6
22 0.2 +0.63 Ka1-b1 Ka7-b7 Kb1-c1 Kb7-c7 Kc1-d1 Kc7-d7
Kd1-c2 Kd7-e7 Kc2-d3 Ke7-f7 Kd3-c4 Kf7-g6
Kc4-b5 Kg6-h5 Kb5-c6 Kh5-g4 Kc6xd6 Kg4xf4
Kd6-c5 Kf4-e4 d5-d6 f5-f4
22: 0.2 +0.63 Ka1-b1 Ka7-b7 Kb1-c1 Kb7-c7 Kc1-d1 Kc7-d7
Kd1-c2 Kd7-e7 Kc2-d3 Ke7-f7 Kd3-c4 Kf7-g6
Kc4-b5 Kg6-h5 Kb5-c6 Kh5-g4 Kc6xd6 Kg4xf4
Kd6-c5 Kf4-e4 d5-d6 f5-f4
23 0.2 +0.74 Ka1-b1 Ka7-b7 Kb1-c1 Kb7-c7 Kc1-d1 Kc7-d7
Kd1-c2 Kd7-e7 Kc2-d3 Ke7-f7 Kd3-c4 Kf7-g6
Kc4-b5 Kg6-h5 Kb5-c6 Kh5-g4 Kc6xd6 Kg4xf4
Kd6-c5 Kf4-e4 d5-d6 f5-f4 d6-d7
23: 0.2 +0.74 Ka1-b1 Ka7-b7 Kb1-c1 Kb7-c7 Kc1-d1 Kc7-d7
Kd1-c2 Kd7-e7 Kc2-d3 Ke7-f7 Kd3-c4 Kf7-g6
Kc4-b5 Kg6-h5 Kb5-c6 Kh5-g4 Kc6xd6 Kg4xf4
Kd6-c5 Kf4-e4 d5-d6 f5-f4 d6-d7
24 1.2 :-) Ka1-b1
24 2.9 +0.73 Ka1-b1 Ka7-b7 Kb1-c1 Kb7-c7 Kc1-d1 Kc7-d7
Kd1-c2 Kd7-c8 Kc2-d2 Kc8-d7 Kd2-c3 Kd7-c7
Kc3-d3 Kc7-b7 Kd3-d2 Kb7-c8 Kd2-c2 Kc8-b8
Kc2-b3 Kb8-c7 Kb3-c3 Kc7-b7 Kc3-d3 Kb7-c7
24: 2.9 +0.73 Ka1-b1 Ka7-b7 Kb1-c1 Kb7-c7 Kc1-d1 Kc7-d7
Kd1-c2 Kd7-c8 Kc2-d2 Kc8-d7 Kd2-c3 Kd7-c7
Kc3-d3 Kc7-b7 Kd3-d2 Kb7-c8 Kd2-c2 Kc8-b8
Kc2-b3 Kb8-c7 Kb3-c3 Kc7-b7 Kc3-d3 Kb7-c7
25 2.9 :-) Ka1-b1
25 23.4 +0.73 Ka1-b1 Ka7-b7 Kb1-c1 Kb7-c7 Kc1-d1 Kc7-d7
Kd1-c2 Kd7-c8 Kc2-d2 Kc8-d7 Kd2-c3 Kd7-c7
Kc3-d3 Kc7-b7 Kd3-e3 Kb7-c8 Ke3-f3 Kc8-d7
Kf3-e2 Kd7-d8 Ke2-d3 Kd8-c7 Kd3-c4 Kc7-b6
Kc4-d3
25: 23.4 +0.73 Ka1-b1 Ka7-b7 Kb1-c1 Kb7-c7 Kc1-d1 Kc7-d7
Kd1-c2 Kd7-c8 Kc2-d2 Kc8-d7 Kd2-c3 Kd7-c7
Kc3-d3 Kc7-b7 Kd3-e3 Kb7-c8 Ke3-f3 Kc8-d7
Kf3-e2 Kd7-d8 Ke2-d3 Kd8-c7 Kd3-c4 Kc7-b6
Kc4-d3
26 23.4 :-) Ka1-b1
26 144.3 +1.40 Ka1-b1 Ka7-b7 Kb1-c1 Kb7-c7 Kc1-d1 Kc7-d7
Kd1-c2 Kd7-c8 Kc2-d2 Kc8-d7 Kd2-c3 Kd7-c7
Kc3-d3 Kc7-b7 Kd3-e3 Kb7-c8 Ke3-f3 Kc8-d7
Kf3-g3 Kd7-e7 Kg3-h4 Ke7-f6 Kh4-h5 Kf6-e7
Kh5-g6 Ke7-d7 Kg6xf5
26: 144.3 +1.40 Ka1-b1 Ka7-b7 Kb1-c1 Kb7-c7 Kc1-d1 Kc7-d7
Kd1-c2 Kd7-c8 Kc2-d2 Kc8-d7 Kd2-c3 Kd7-c7
Regards,
Miguel
>
>Thanks
>Adam
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