Author: Tony Werten
Date: 06:05:43 11/14/01
Go up one level in this thread
On November 14, 2001 at 07:24:26, Dieter Buerssner wrote:
>On November 13, 2001 at 13:36:45, Tony Werten wrote:
>
>>On November 13, 2001 at 09:57:20, Jon Dart wrote:
>>> 8/4kp2/4p3/p2pP2n/Pp2nPp1/1P2P1P1/2K1N3/4B3 b - - bm f6;
>
>>At ply 15 programs should see a big material advantage. Before that there are
>>only positional reasons.
>
>I think, this is not totally true, when taking null move into account. At depth
>15, f6 is "refuted" by the following line for Yace (score for the "best" move
>Kd7 is 0.77)
>
> 15x 1...f6 2. exf6+ Nexf6 3. null Kd7 4. null Ke7
> 5. Nd4 Kd7 {HT}
Yes, it should have been "around ply 15". Point was that there is some material
gain but that is not seen by most program until then. It depends on the amount
of extensions and pruning when it is seen exactly. But if a program chooses f6
at ply 10 it will be (most likely) for positional reasons.
BTW I'm not sure what to think about your "refution" line. Blacks 3rd, 4th and
5th move seem quite useless. They make it very easy to "prove" that f6 is no
better than Kd7, even if white does nothing.
Tony
>
>Regards,
>Dieter
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