Author: Christophe Theron
Date: 13:06:29 10/20/99
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On October 20, 1999 at 06:58:33, Francesco Di Tolla wrote:
>On October 19, 1999 at 13:15:13, Christophe Theron wrote:
>>>What about the, may be trivial idea, of switching on the high selctvity only at
>>>a higher ply number, say after a few plys fully/"classically" calculated?
>
>may be I was not clear: I mean in a given position calculate some plys normally,
>and further plys with high selectivity.
>
>Why this: well you suggest that a high selecttivity is not any more conveninet
>respect to normal approaches (that is what I understood, may be I'm wrong). If
>this is so it is probably because today hardware permits you to calculate enough
>variations anyway without high, and on the other side you take some risks. With
>this approach you would calculate the first plys with less risk and same
>approach as others, while higher plys with higher selctivity might allow you to
>spot something tohers can't, and overcome some horizon errors. For sure the play
>style would be different.
>(Please consider I never coded a chess program myself, let me know if I am
>misunderstanding).
>
>ciao
>Franz
OK. That's an idea I have tried myself. But in the end I have found that if your
selective system (way of pruning away uninteresting moves) is good enough, you
can apply it at any ply depth.
But the idea makes sense indeed if you have a very risky selective algorithm.
You might want do disable it at narrow depths until you manage to refine it and
make it less risky.
The paradox is that I have found that highly selective systems produce the best
results when time controls are fast, or computer is slow. That is: when you
cannot reach a high depths!!!
They produce good results also at longer time controls or on fast computers, but
the advantage they give is less easy to see.
Christophe
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