Author: Pete R.
Date: 09:01:33 06/07/00
Go up one level in this thread
On June 07, 2000 at 01:51:18, Dann Corbit wrote:
>On June 06, 2000 at 19:19:19, Pete R. wrote:
>>On June 06, 2000 at 16:00:17, Dann Corbit wrote:
>>>I think this is a good example to show that "best moves" in EPD test positions
>>>are only "best moves" for a certain depth unless a checkmate is found.
>>
>>I wouldn't go quite that far. For example, after 1. e4 dxe4 in this position,
>>black is completely lost (assuming best play by white of course
>
>See Bernard B.'s post... Crafty seems to have found a loophole in 1. e4 dxe4
>...
>;-)
I assume you mean this:
16 356:58 -0.15 1. e4 dxe4 2. g4 Bc8 3. Qxf7+ Kxh6
4. Rh3+ Bh4 5. Rxh4+ Qxh4 6. Qxe8 Kg7
7. Qe5+ Kf8 8. Qf4+ Kg8 9. Bxe4 Rb8
10. Bd5+
Crafty is simply not doing well here (I tried 16.15 and 17.10). The winning line
is 2...Bc8 3. Qxf7+ Kxh6 4. Rh3+ Bh4 5. Qh5+ Kg7 6. Rxh4 Qf6
7. Qxe8 Qxh4 8. Re1 +-.
From Bc8, it doesn't see 5. Qh5+ is best. As you go down the winning PV it does
choose Qh5+, but then from there it doesn't see 7. Qxe8. In fact if you feed it
the position at 6...Qf6, at 12 ply is still chooses Qh7+ with an eval of 0.52.
Then you feed it 7. Qxe8 and of course the capture Qxh4 is forced, and then it
quickly sees that Re1 wins for white. But missing Qxe8 from the immediately
preceeding position is very strange because it takes less than 12 ply to see
that white wins once you give it the move.
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