Author: Mike Byrne
Date: 08:36:34 03/27/05
Go up one level in this thread
On March 27, 2005 at 11:18:35, Vincent Lejeune wrote:
>On March 27, 2005 at 10:24:52, Mike Byrne wrote:
>
>>On March 27, 2005 at 06:56:35, Vincent Lejeune wrote:
>>
>>>On March 26, 2005 at 21:30:04, Robert Hyatt wrote:
>>>
>>>>On March 26, 2005 at 19:46:58, Vincent Lejeune wrote:
>>>>
>>>>>On March 26, 2005 at 15:34:45, Dieter Buerssner wrote:
>>>>>
>>>>>>On March 26, 2005 at 15:29:42, Dieter Buerssner wrote:
>>>>>>
>>>>>>>On March 26, 2005 at 15:20:17, Mike Byrne wrote:
>>>>>>>
>>>>>>>>after the main line : Kf2 f5 h3 Kc7 g3 hxg3 is winning no?
>>>>>>>>
>>>>>>>>Black(2): his
>>>>>>>> white black
>>>>>>>> 1 Kf2 f5
>>>>>>>> 2 h3 Kc7
>>>>>>>> 3 g3 ...
>>>>>>>> 17 25.52 -7.17 3. ... hxg3+ 4. Kxg3 f4+ 5. Kg4 b6
>>>>>>>> 6. h4 f3 7. Kxf3 gxh4 8. c6 Kxc6 9.
>>>>>>>> Kg4 b5 10. a5 b4 11. Kxh4 Kb5 12. Kg4
>>>>>>>>
>>>>>>>
>>>>>>>In this line, Yace says 8. c6? is losing, while 8.cxb6 is draw.
>>>>>>
>>>>>>It is such an obvious blunder, that it looks like a bug in Crafty.
>>>>>>
>>>>>>Regards,
>>>>>>Dieter
>>>>>
>>>>>
>>>>>Probably a bug in the static eval of the pawn endgame. after 3 min@3 Ghz :
>>>>
>>>>I can't reproduce Mikes PV with this "c6 bug"... I don't get c6 at any point
>>>>that I can see, it always takes...
>>>>
>>>>Any ideas?
>>>
>>>
>>>I succeded to replicate c6 as best move :
>>>1) without any EGTB
>>>2) starting with this position 8/1p1k4/5p2/2Pp2p1/P2P3p/8/6PP/6K1 w - - 0 1
>>>3) under chessbase interface
>>>4) played 1. Kf2 f5 2. h3 Kc7 3. g3 hxg3+ 4. Kxg3 with 5 between each move
>>>5) the score is rising for white but it so long I stopped
>>>Is it a problem related to only pawns endgame eval or linked to hashtables too ?
>>>
>>
>>I suggest not to test under Chessbase GUI unless you are using the native
>>chessbase crafty engine.
>
>I use the native chessbase crafty engine.
after Kxg3 above, you should see a draw score -- Crafty output from a console
window is below - anything else and something is broken -- in my case it was
bad kppkp egtb. I would contact Chessbase since they compiled thenative
chessbase Crafty.
White(4): Kxg3
analyze.White(4): White(4): Kxg3
clearing hash tables
time surplus 0.00 time limit 10:00 (10:00)
depth time score variation (1)
9 0.05 -0.50 4. ... f4+ 5. Kg4 b6 6. h4 f3 7. Kxf3
gxh4 8. cxb6+ Kxb6 9. Kg4 Ka5 10. Kxh4
Kxa4 (s=3)
9-> 0.08 -0.50 4. ... f4+ 5. Kg4 b6 6. h4 f3 7. Kxf3
gxh4 8. cxb6+ Kxb6 9. Kg4 Ka5 10. Kxh4
Kxa4
10 0.10 -0.82 4. ... f4+ 5. Kg4 Kd7 6. h4 f3 7. Kxf3
gxh4 8. Kg4 Ke7 9. a5 Ke6 10. Kxh4
10-> 0.11 -0.82 4. ... f4+ 5. Kg4 Kd7 6. h4 f3 7. Kxf3
gxh4 8. Kg4 Ke7 9. a5 Ke6 10. Kxh4
11 0.14 -0.72 4. ... f4+ 5. Kg4 Kd7 6. a5 Kd8 7.
h4 f3 8. Kxf3 gxh4 9. Kg4 Ke7 10. Kxh4
11-> 0.16 -0.72 4. ... f4+ 5. Kg4 Kd7 6. a5 Kd8 7.
h4 f3 8. Kxf3 gxh4 9. Kg4 Ke7 10. Kxh4
12 0.22 -0.50 4. ... f4+ 5. Kg4 Kd7 6. a5 Kd8 7.
c6 Kc7 8. cxb7 Kxb7 9. h4 f3 10. Kxf3
gxh4 11. Kg4 Ka6 12. Kxh4 Kxa5
12-> 0.25 -0.50 4. ... f4+ 5. Kg4 Kd7 6. a5 Kd8 7.
c6 Kc7 8. cxb7 Kxb7 9. h4 f3 10. Kxf3
gxh4 11. Kg4 Ka6 12. Kxh4 Kxa5
13 0.33 -0.60 4. ... f4+ 5. Kg4 Kd7 6. a5 Kd8 7.
Kf3 Kc7 8. Kg2 Kb8 9. Kf2 Ka7 10. c6
bxc6 11. Kf3
13-> 0.43 -0.60 4. ... f4+ 5. Kg4 Kd7 6. a5 Kd8 7.
Kf3 Kc7 8. Kg2 Kb8 9. Kf2 Ka7 10. c6
bxc6 11. Kf3
14 0.58 +1 4. ... f4+
14 0.78 -0.01 4. ... f4+ 5. Kg4 Kc6 6. h4 f3 7. Kxf3
gxh4 8. Kg4 b6 9. cxb6 Kxb6 10. Kxh4
<EGTB>
14-> 0.89 -0.01 4. ... f4+ 5. Kg4 Kc6 6. h4 f3 7. Kxf3
gxh4 8. Kg4 b6 9. cxb6 Kxb6 10. Kxh4
<EGTB>
15 1.05 -0.01 4. ... f4+ 5. Kg4 Kc6 6. h4 f3 7. Kxf3
gxh4 8. Kg4 b6 9. cxb6 Kxb6 10. Kxh4
<EGTB>
15-> 1.18 -0.01 4. ... f4+ 5. Kg4 Kc6 6. h4 f3 7. Kxf3
gxh4 8. Kg4 b6 9. cxb6 Kxb6 10. Kxh4
<EGTB> (s=2)
16 1.49 -0.01 4. ... f4+ 5. Kg4 Kc6 6. h4 f3 7. Kxf3
gxh4 8. Kg4 b6 9. cxb6 Kxb6 10. Kxh4
<EGTB>
16-> 1.80 -0.01 4. ... f4+ 5. Kg4 Kc6 6. h4 f3 7. Kxf3
gxh4 8. Kg4 b6 9. cxb6 Kxb6 10. Kxh4
<EGTB> (s=2)
17 2.60 -0.01 4. ... f4+ 5. Kg4 Kc6 6. h4 f3 7. Kxf3
gxh4 8. Kg4 b6 9. cxb6 Kxb6 10. Kxh4
<EGTB>
17-> 3.11 -0.01 4. ... f4+ 5. Kg4 Kc6 6. h4 f3 7. Kxf3
gxh4 8. Kg4 b6 9. cxb6 Kxb6 10. Kxh4
<EGTB> (s=2)
18 4.30 -0.01 4. ... f4+ 5. Kg4 Kc6 6. h4 f3 7. Kxf3
gxh4 8. Kg4 b6 9. cxb6 Kxb6 10. Kxh4
<EGTB>
18-> 5.47 -0.01 4. ... f4+ 5. Kg4 Kc6 6. h4 f3 7. Kxf3
gxh4 8. Kg4 b6 9. cxb6 Kxb6 10. Kxh4
<EGTB> (s=2)
19 8.07 -0.01 4. ... f4+ 5. Kg4 Kc6 6. h4 f3 7. Kxf3
gxh4 8. Kg4 b6 9. cxb6 Kxb6 10. Kxh4
<EGTB>
19-> 11.30 -0.01 4. ... f4+ 5. Kg4 Kc6 6. h4 f3 7. Kxf3
gxh4 8. Kg4 b6 9. cxb6 Kxb6 10. Kxh4
<EGTB> (s=2)
20 18.07 -0.01 4. ... f4+ 5. Kg4 Kc6 6. h4 f3 7. Kxf3
gxh4 8. Kg4 b6 9. cxb6 Kxb6 10. Kxh4
<EGTB>
20 24.85 8/9? 4. ... g4
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