Author: Tim Foden
Date: 00:42:18 09/23/03
Go up one level in this thread
On September 23, 2003 at 03:03:12, Johan de Koning wrote:
>On September 22, 2003 at 02:32:34, Tim Foden wrote:
>
>>I think these positions might behave like smaller versions of the full thing...
>>
>>[d] 8/1pppppp1/8/8/8/8/1PPPPPP1/8 w - -
>>
>>GLC thinks this is a win... d4 Mate in 15.
>
>Hmmm..., my program (named JJ.EXE :-) proved it a draw.
>Then I added en passent.
>Now it says it's a mate in 14.
>
>098.81 75M346 D21 +4 : d4,d5 f3,b6 e4,dxe4 fxe4,b5 b4,c6 g3,f6 g4,g6 e ...
>184.33 140M189 D23 +212 : d4,d5 f3,g6 e4,dxe4 fxe4,f5 exf5,gxf5 b4,e6 b5, ...
>279.30 212M443 D25 +9973 : d4,d5 f3,b6 e4,dxe4 fxe4,b5 c3,e6 e5,c6 b4,f6 e ...
>377.94 286M689 D27 +9973 : d4,d5 f3,b6 e4,dxe4 fxe4,b5 c3,c6 b3,g6 c4,bxc4 \
> bxc4,f6 c5,e6 d5,exd5 exd5,cxd5
>0000011111 1111222222 22222222:: :::::::::: :::::::::: :::::::::: ::::::::::
>0357912456 7899011222 23222210:: :::::::::: :::::::::: :::::::::: ::::::::::
>
>So by adding e.p. I removed the 1 known bug, but we still don't agree. :-(
>Unfortunately we don't know the number and nature of the unknown bugs. :-)
>
>.. Johan
Well, we can probably track the bugs down...
After d4 d5 GLC agrees that f3 is a mate in 13...
[d]8/1pp1ppp1/8/3p4/3P4/8/1PP1PPP1/8 w
22 6.229 +Mate13 6249564 f3 g5 2. e4 e5 3. dxe5 d4 4. b4 c6 5. g3 b6 6. f4
gxf4 7. gxf4 c5 8. f5 d3 9. cxd3 cxb4 10. e6
fxe6 11. fxe6 b3
GLC prefers g5 after f3 rather than b6.
But what does yours say after d4 g5?
[d]8/1ppppp2/8/6p1/3P4/8/1PP1PPP1/8 w
GLC says:
22 22.202 +Mate14 21765k c4 f5 2. g3 f4 3. e4 fxe3 4. fxe3 e6 5. g4 d6 6.
d5 exd5 7. cxd5 c6 8. dxc6 bxc6 9. e4 c5 10. b3
d5 11. exd5 {ht}
or for a 1 move longer PV...
25 25.336 +Mate14 25311k c4 f5 2. g3 f4 3. e4 fxe3 4. fxe3 e6 5. g4 d6 6.
d5 exd5 7. cxd5 c6 8. dxc6 bxc6 9. e4 c5 10. b3
d5 11. exd5 c4
Cheers, Tim.
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