Author: Robert Hyatt
Date: 17:40:51 11/22/00
Go up one level in this thread
On November 22, 2000 at 20:43:48, Robert Hyatt wrote:
>On November 22, 2000 at 20:28:50, Andrew Dados wrote:
>
>>On November 22, 2000 at 14:06:22, Robert Hyatt wrote:
>>
>>>On November 22, 2000 at 12:32:47, Bruce Moreland wrote:
>>>
>>>>On November 22, 2000 at 03:55:13, Jeremiah Penery wrote:
>>>>
>>>>>On November 22, 2000 at 00:02:34, Bruce Moreland wrote:
>>>>>
>>>>>>On November 21, 2000 at 20:24:31, Jeremiah Penery wrote:
>>>>>>
>>>>>>>On November 21, 2000 at 20:11:10, Bruce Moreland wrote:
>>>>>>>
>>>>>>>>What does Crafty think of the Reti study:
>>>>>>>>
>>>>>>>>[D]7K/8/k1P5/7p/8/8/8/8 w - - 0 1
>>>>>>>>
>>>>>>>>White to move draws. I might have this slightly wrong, because I'm constructing
>>>>>>>>it from memory.
>>>>>>>>
>>>>>>>>bruce
>>>>>>>
>>>>>>>I get a drawscore at ply 9 from Crafty in this position.
>>>>>>>
>>>>>>>This is the last line I got:
>>>>>>>
>>>>>>>22-> 1:01 -0.50 1. Kg7 Kb6 2. Kf6 Kxc6 3. Kg5 h4 4.
>>>>>>> Kxh4 Kc7 5. Kh5 Kb6 6. Kh6 Ka5 7. Kg6
>>>>>>> Kb6 8. Kh5 Ka5 9. Kh6 Kb6 10. Kg6 Ka5
>>>>>>> 11. Kh5 Kb6
>>>>>>
>>>>>>What interests me would be the scores prior to that ply, where Crafty things
>>>>>>white is going to hit a home run.
>>>>>>
>>>>>>bruce
>>>>
>>>>> 7 0.19 -0.50 1. c7 Kb7 2. c8=Q+ Kxc8 3. Kh7 Kb7
>>>>> 4. Kh6 Kc6 5. Kxh5
>>>>> 7-> 0.21 -0.50 1. c7 Kb7 2. c8=Q+ Kxc8 3. Kh7 Kb7
>>>>> 4. Kh6 Kc6 5. Kxh5
>>>>
>>>>>Crafty never thinks white is winning in this position.
>>>>
>>>>It should think black is winning, because black's pawn can't be stopped, but
>>>>white's can. I snipped out a lot of the other lines here, but does anyone else
>>>>think that the line I kept is completely ridiculous?
>>>>
>>>>Bob, what the heck is crafty doing there?
>>>>
>>>>bruce
>>>
>>>There are several possible issues here. My PV may well be silly on the end.
>>>When I get a hash hit, with an EXACT score, the PV is obviously cut short at
>>>that point. Later, I try to probe the hash table to add more moves to the
>>>end. And on occasion, those moves might not make any sense, and might not
>>>even be part of the set of moves that leads to the score it gave...
>>>
>>>Here is a non-egtb output from crafty (400mhz machine, one cpu):
>>>
>>> time surplus 0.00 time limit 30.00 (3:00)
>>> nss depth time score variation (1)
>>> 1 0.00 -3.50 1. Kg8
>>> 1-> 0.00 -3.50 1. Kg8
>>> 2 0.00 -- 1. Kg8
>>> 2 0.00 -3.91 1. Kg8 h4
>>> 2 0.00 ++ 1. c7!!
>>> 2 0.00 0.00 1. c7 Kb7 2. c8=Q+ Kxc8
>>
>>[snip]
>>
>>Bob.. how can you justify zero score here...?
>
>
>Good question... I am looking... There is one potential explanation for old
>crafty's... someone sent me a change to the rook pawn + wrong bishop code
>that worked in every case except one... no bishops and the opponent has enough
>pawns to win, while it only had a rook pawn that couldn't promote. The change
>would say "draw" which was wrong. I "thought" this was fixed. In looking at
>the position, I might have either lost the fix, or else my fix had a hole I
>didn't notice.
>
>More in a little while...
>
>OK... my "fix" got lost. Not sure how... probably meant to copy from my
>notebook (with fix) to my quad xeon, but must have done it backward losing
>the fix.
>
>I will re-do the fix and rerun the test. It is nonsense at present...
Here is more reasonable output:
nss depth time score variation (1)
1 0.00 -3.50 1. Kg8
1-> 0.01 -3.50 1. Kg8
2 0.02 -- 1. Kg8
2 0.03 -3.91 1. Kg8 h4
2 0.04 ++ 1. c7!!
2 0.05 -3.17 1. c7 Kb7 2. Kg8
2-> 0.06 -3.17 1. c7 Kb7 2. Kg8
3 0.06 -- 1. c7
3 0.07 -5.63 1. c7 Kb7 2. Kg7 Kxc7
3 0.08 ++ 1. Kg8!!
3 0.09 -3.58 1. Kg8 h4 2. c7 Kb7
3 0.10 -3.41 1. Kg7 h4 2. Kf6
3-> 0.12 -3.41 1. Kg7 h4 2. Kf6
4 0.13 ++ 1. Kg7!!
4 0.16 -2.97 1. Kh7 Kb6 2. c7 Kb7 3. Kg6
4-> 0.17 -2.97 1. Kh7 Kb6 2. c7 Kb7 3. Kg6
5 0.18 -- 1. Kh7
5 0.19 -4.21 1. Kh7 h4 2. Kg6 h3 3. c7 Kb7
5 0.20 -4.14 1. Kg8 h4 2. Kf7 h3 3. Ke6
5 0.21 -3.91 1. Kg7 h4 2. Kf6 h3 3. c7 Kb7
5-> 0.22 -3.91 1. Kg7 h4 2. Kf6 h3 3. c7 Kb7
6 0.22 ++ 1. Kg7!!
6 0.23 -3.08 1. Kg7 h4 2. Kg6 Kb6 3. c7 Kb7 4. Kf6
6-> 0.23 -3.08 1. Kg7 h4 2. Kg6 Kb6 3. c7 Kb7 4. Kf6
7 0.23 -- 1. Kg7
7 0.24 -3.74 1. Kg7 h4 2. Kf6 Kb6 3. Ke5 h3 4. Kd6
7-> 0.25 -3.74 1. Kg7 h4 2. Kf6 Kb6 3. Ke5 h3 4. Kd6
8 0.26 -3.94 1. Kg7 h4 2. Kf6 h3 3. Ke6 Kb6 4. Kd7
Ka6
8-> 0.27 -3.94 1. Kg7 h4 2. Kf6 h3 3. Ke6 Kb6 4. Kd7
Ka6
9 0.32 -3.81 1. Kg7 h4 2. Kf6 Kb6 3. Ke5 h3 4. Kd6
Ka6 5. c7 Kb7
9-> 0.34 -3.81 1. Kg7 h4 2. Kf6 Kb6 3. Ke5 h3 4. Kd6
Ka6 5. c7 Kb7
10 0.36 ++ 1. Kg7!!
10 0.46 -3.21 1. Kg7 h4 2. Kf6 Kb6 3. Ke5 h3 4. Kd6
Ka6 5. c7 Kb7 6. Kd7
10-> 0.57 -3.21 1. Kg7 h4 2. Kf6 Kb6 3. Ke5 h3 4. Kd6
Ka6 5. c7 Kb7 6. Kd7
11 0.61 ++ 1. Kg7!!
11 0.64 0.00 1. Kg7 h4 2. Kf6 h3 3. Ke6 h2 4. c7
Kb7 5. Kd7 h1=Q 6. c8=Q+ Kb6 7. Ke8
Qa1
11-> 0.65 0.00 1. Kg7 h4 2. Kf6 h3 3. Ke6 h2 4. c7
Kb7 5. Kd7 h1=Q 6. c8=Q+ Kb6 7. Ke8
Qa1
12 0.72 0.00 1. Kg7 h4 2. Kf6 h3 3. Ke6 h2 4. c7
Kb7 5. Kd7 h1=Q 6. c8=Q+ Kb6 7. Ke8
Qa1 8. Kf8
12-> 0.75 0.00 1. Kg7 h4 2. Kf6 h3 3. Ke6 h2 4. c7
Kb7 5. Kd7 h1=Q 6. c8=Q+ Kb6 7. Ke8
Qa1 8. Kf8
13 0.84 0.00 1. Kg7 h4 2. Kf6 h3 3. Ke6 h2 4. c7
Kb7 5. Kd7 h1=Q 6. c8=Q+ Kb6 7. Ke8
Qa1 8. Qd7 Qh8+ 9. Kf7
13-> 0.86 0.00 1. Kg7 h4 2. Kf6 h3 3. Ke6 h2 4. c7
Kb7 5. Kd7 h1=Q 6. c8=Q+ Kb6 7. Ke8
Qa1 8. Qd7 Qh8+ 9. Kf7
14 0.97 0.00 1. Kg7 h4 2. Kf6 h3 3. Ke6 h2 4. c7
Kb7 5. Kd7 h1=Q 6. c8=Q+ Kb6 7. Ke8
Qa1 8. Qd7 Qh8+ 9. Kf7 Ka5
14-> 1.00 0.00 1. Kg7 h4 2. Kf6 h3 3. Ke6 h2 4. c7
Kb7 5. Kd7 h1=Q 6. c8=Q+ Kb6 7. Ke8
Qa1 8. Qd7 Qh8+ 9. Kf7 Ka5
15 1.19 0.00 1. Kg7 h4 2. Kf6 h3 3. Ke6 h2 4. c7
Kb7 5. Kd7 h1=Q 6. c8=Q+ Kb6 7. Ke8
Qa1 8. Qd7 Qh8+ 9. Kf7 Ka5 10. Qe8
15-> 1.22 0.00 1. Kg7 h4 2. Kf6 h3 3. Ke6 h2 4. c7
Kb7 5. Kd7 h1=Q 6. c8=Q+ Kb6 7. Ke8
Qa1 8. Qd7 Qh8+ 9. Kf7 Ka5 10. Qe8
16 1.48 0.00 1. Kg7 h4 2. Kf6 h3 3. Ke6 h2 4. c7
Kb7 5. Kd7 h1=Q 6. c8=Q+ Kb6 7. Ke8
Qa1 8. Qd7 Qh8+ 9. Kf7 Ka5 10. Qe8
Qxe8+ 11. Kxe8
16-> 1.51 0.00 1. Kg7 h4 2. Kf6 h3 3. Ke6 h2 4. c7
Kb7 5. Kd7 h1=Q 6. c8=Q+ Kb6 7. Ke8
Qa1 8. Qd7 Qh8+ 9. Kf7 Ka5 10. Qe8
Qxe8+ 11. Kxe8
17 1.88 0.00 1. Kg7 h4 2. Kf6 h3 3. Ke6 h2 4. c7
Kb7 5. Kd7 h1=Q 6. c8=Q+ Kb6 7. Ke8
Qa1 8. Qd7 Qh8+ 9. Kf7 Ka5 10. Qe8
Qxe8+ 11. Kxe8 Ka4
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