Author: Jeremiah Penery
Date: 21:12:22 03/10/99
Go up one level in this thread
On March 10, 1999 at 15:39:21, blass uri wrote:
>
>On March 10, 1999 at 12:38:18, Jeremiah Penery wrote:
>
>>On March 10, 1999 at 02:33:14, Peter Kappler wrote:
>>
>>>
>>>8/8/4kpp1/3p1b2/p6P/2B5/6P1/6K1 b - - bm Bh3; id "Topalov-Shirov Linares 98";
>>>
>>>
>>>Does everybody remember this game? It's from last year's Linares tournament,
>>>where Shirov played a shocking bishop sacrifice in the endgame and won
>>>brilliantly. I believe that post-mortem analysis proved it was the only way to
>>>win. (Please correct me if this is wrong)
>>>
>>>I watched this game live on ICC with dozens of others, and we were all quite
>>>impressed with Shirov's powers of calculation.
>>>
>>>This *should* be an extremely difficult problem for computers - but I'm sure
>>>somebody will tell me that Hiarcs or some other commercial program can solve it
>>>in 10 seconds.
>>>
>>>Just curious...
>>>
>>>--Peter
>>
>>Here is some Crafty output after I made the moves 1. ...Bh3 2. gxh3
>>
>> 19 26:25 0.43 2. ... f5 3. Kf2 Kd6 4. Bd4 Kc6 5.
>> Ke3 Kb5 6. Kd3 a3 7. Ba1 Kc5 8. Be5
>> a2 9. Ba1 f4 10. Ke2 d4 11. Kf3 d3
>> 12. Kxf4
>> 19 56:46 ++ 2. ... Kf5!!
>> 19-> 62:48 0.82 2. ... Kf5
>> 20 68:52 -- 2. ... Kf5
>> 20 116:20 ++ 2. ... Kf5!!
>> 20-> 144:30 0.81 2. ... Kf5
>> 21 198:02 ++ 2. ... Kf5!!
>> 21 261:49 2.29 2. ... Kf5 3. Kf2 Ke4 4. Bxf6 d4 5.
>> h5 gxh5 6. Be7 Kd3 7. Bc5 Kc4 8. Bf8
>> Kb3 9. h4 Kc2 10. Bb4 d3 11. Ke3 a3
>> 12. Kd4 a2 13. Bc3
>>
>>I guess it's finally seeing the win after >4 hours. From the original position,
>>a 15-ply search showed 1. a3 with a score of +3.xx. I'm going to see what
>>happens after 1. ...a3.
>
>a 15 ply search of Crafty16.5 as an engine for Junior5(no tablebases) showed
>1.a3 with a score of only 2.65.
>
>1)Do you use crafty16.5 or a newer version or a modified version?
>
>2)is the 3.xx is bigger than the values at 12,13,14 plies?
>
>If yes then I suspect that a3 is winning and I want to see the main line of
>crafty.
>If no then I do not trust the 3.xx
>
>Uri
This is a modified Crafty 16.5 on a PII-300. I've let it search 1. ...a3 2. Kf2
and here's output so far:
-----------------------------------------------------------------------
16-> 15:58 2.99 2. ... Bc2 3. Ba1 Kf5 4. Ke3 Be4 5.
Kd2 Bb1 6. g3 Be4 7. Bc3 a2 8. Ke3
Kg4 9. Kf2 Kf5 10. Ba1 Bh1 <HT>
17 28:22 2.95 2. ... Bc2 3. Ba1 f5 4. Ke3 Kd6 5.
Kd4 Bb3 6. Bc3 a2 7. Kd3 Ba4 8. Ba1
Kc5 9. g3 Bb5+ 10. Kc3 d4+ 11. Kb2
Bc4 12. Kc1
17-> 53:17 2.95 2. ... Bc2 3. Ba1 f5 4. Ke3 Kd6 5.
Kd4 Bb3 6. Bc3 a2 7. Kd3 Ba4 8. Ba1
Kc5 9. g3 Bb5+ 10. Kc3 d4+ 11. Kb2
Bc4 12. Kc1
18 85:33 3.03 2. ... Bc2 3. Ba1 f5 4. Ke3 Kd6 5.
Kd4 Bb3 6. Bc3 a2 7. Kd3 f4 8. Bd4
Ke6 9. Ba1 Bc4+ 10. Kc3 Ke5 11. Kb2
d4 12. Kc1
18-> 158:35 3.03 2. ... Bc2 3. Ba1 f5 4. Ke3 Kd6 5.
Kd4 Bb3 6. Bc3 a2 7. Kd3 f4 8. Bd4
Ke6 9. Ba1 Bc4+ 10. Kc3 Ke5 11. Kb2
d4 12. Kc1
19 358:38 2.98 2. ... Bc2 3. Ke3 Kf5 4. Kd2 Bb1 5.
Kc1 a2 6. Kb2 Kg4 7. Bxf6 Kg3 8. Kb3
Kxg2 9. Kb4 Kg3 10. Ba1 Kxh4 <HT>
------------------------------------------------------------------------
The score has hardly changed from ply 1, and ply 19 is not done being searched.
I have TBs disabled during this search, because the heavy HD access slows down
my system considerably.
Jeremiah
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