Author: Miguel A. Ballicora
Date: 09:12:47 09/21/01
Go up one level in this thread
On September 21, 2001 at 07:49:29, Gian-Carlo Pascutto wrote:
>On September 20, 2001 at 15:42:33, J. Wesley Cleveland wrote:
>
>>>is f7 really better than Rxe8?
>>
>>They appear to be straight transpositions.
>> 16-> 44:24 3.63 1. f5 Qg5 2. Rxe8+ Bxe8 3. Bxg7+ Qxg7
>> 4. f6 Qf8 5. Bxc6 Kg8 6. Bxb7 c6 7.
>> Bc8 Qh6 8. Be6+ Bf7 9. Bd7 c5 10. Kg2
>> Qe3 11. Qc2 h6
In this line the option that Crafty does not prefer is the best line:
2. Bxh6+ Qxg7 3. f6 Qf8 4. f7+ Ne5 (Re5 5.Bxc6 Bxc6 6.Rxe5 dxe5 7.Qxe5+ Qg7
8.f8=Q#) 5. fxe8=Q Qxe8 and White is an exchange up, winning easily.
So, if you want to win the exchange there is no transposition.
(Please somebody check this, it is an analysis on the screen but I am pretty
sure)
Crafty seems to like winning two pawns instead, which in this case is not
the best/easiest. IMHO. However, the decision ends up being "positional"
For that reason, the test should be left out.
I like the position though, a possible fix could be to modify it with
a pawn in b6 rather than b7.
As I am writing this, I test Gaviota with the pawn in b6 and found
another possible cook line! (that allows transpositions between Rxe8 and f5)
After Rxe8 and Bxe8 gives:
40994583 11: 308.2 +2.73 f4-f5 Qg6-g5 f5-f6 Qg5-e3
Kg1-g2 Nc6-e5 Bc3-d4 Qe3-g5
Bd4xe5 d6xe5 f6-f7 Be8xf7
Bd5xf7 Qg5-f5
with a piece up!!
I like this even better!!
Notice that this line is possible withe pawn in b7 or b6, it does not matter.
Now I am convinced. This position should be left out, Rxe8 wins convincingly
and it is a transposition of f5.
Regards,
Miguel
>> time=60:01 cpu=99% mat=0 n=835372901 fh=22% nps=231k
>>
>> 16-> 28:46 3.64 1. Rxe8+ Bxe8 2. f5 Qg5 3. Bxg7+ Qxg7
>> 4. f6 Qf8 5. Bxc6 Bf7 6. Bxb7 Qe8 7.
>> Kf2 Qe6 8. Qd4 a5 9. g4 c5 10. Qf4
>> h5 11. gxh5 Bxh5
>> time=28:46 cpu=99% mat=0 n=331499134 fh=92% nps=192k
>
>
>I'm not so sure about that. White doesn't _have_ to exchange the rooks
>if he plays f7 first and not doing so is probably better because it adds
>force to the attack.
>
>--
>GCP
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