Author: Bernhard Bauer
Date: 00:16:06 12/19/00
Go up one level in this thread
On December 18, 2000 at 12:52:43, Bruce Moreland wrote:
>On December 18, 2000 at 10:51:59, Bernhard Bauer wrote:
>
>>On December 18, 2000 at 07:08:38, Tim Foden wrote:
>>
>>>Hi All,
>>>
>>>I have recently been looking at lots of old posts (I've been mucking around
>>>with my own archive browser with better search functionality), and I keep
>>>coming across the FINE 70 position as a good test for a hash implementation.
>>>
>>>I have been worried about the hash code in GLC for a while now, but I haven't
>>>been able to track anything down that is wrong. I'm not sure there _is_
>>>even anything wrong.
>>>
>>>Are there any other (simpler... where I can dump the tree an look at it
>>>myself) positions that also test the hash table in this way?
>>>
>>
>>You may try
>>F. Sackmann, matt in 25 Zuegen, 1.Kf5
>>8/8/2p/k1p1K/p1P/P/8/8 w
>>J. Awerbach
>>8/1k/p/p2p2K/P2P/8/8/8 w
>
>I think the above is cooked, both Kf5 and Kf6 seem to win.
>
Position FEN: 8/1k/p/p2p2K/P2P/8/8/8 w
is from M. Botwinnik, 1939 according to J. Awerbach.
If I do a search for 1. Kf6 Crafty gives a draw
60-> 16.89 0.01 1. Kf6 Kb6 2. Ke6 Kc6 3. Ke5 Kc7 4.
Kxd5 Kd7 5. Kc4 Kd6 6. d5 Kc7 7. Kc5
Kd7 8. d6 Kd8 9. Kc6 Kc8 10. Kb6 Kd7
11. Kxa6 <HT>
If I, however, search for 1. Kf5 Crafty gives a winning line
34-> 12.92 9.04 1. Kf5 Kb6 2. Kf6 Kb7 3. Kf7 Kb6 4.
Ke8 Kc6 5. Kd8 Kd6 6. Kc8 Ke6 7. Kb7
Kf5 8. Kc6 Ke4 9. Kc5 Ke3 10. Kxd5
Kd3 11. Ke5 Kc4 12. d5 Kc5 13. d6 Kb6
14. Ke6 Kc6 15. d7 Kc7 16. Ke7 <HT>
>>J. Awerbach
>>6k/3p/3p/3P/4P1p/6P/8/K w
>
>I can't find a really convincing win quickly here.
This one is from C. Locock, 1892 according to J. Awerbach.
White to move wins by 1. Kb1, black to move draws by 1. ..Kg7 or by 1. ..Kh7.
Crafty gives:
29-> 2:15 4.36 1. Kb1 Kh7 2. Kc2 Kh6 3. Kd2 Kg6 4.
Kd3 Kh5 5. Kd4 Kh6 6. e5 Kg6 7. Ke4
Kg5 8. exd6 Kg6 9. Kf4 Kf6 10. Kxg4
Ke5 11. Kg5 Ke4 12. Kf6 Kxd5
Kind regards
Bernhard
>bruce
>
>>These 3 positions are very similar fine70 as they are solved by the
>>method of coresponding squares.
>>
>>Kind regards
>>Bernhard
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