2008/9/14 Joost 't Hart <[EMAIL PROTECTED]>
> Hi Pascal,
>
> I am not sure that I agree to your statement that the tree window
> handles "positions". Actually, I am sure it does not.
It does (and I suppose you don't use "fast mode").
It is really moves that are listed, together with some statistics on games
> in
> which these moves were played. When you execute one of these moves, very
> often the overall statistics on the position you arrive at are different
> (because of other transpositions into the new position).
> I am also sure that moves that were never played in actual games but which
> DO
> transpose to positions which are in the database are not mentioned in the
> tree list.
>
Strange (and I suppose again you don't use "fast mode", which does not
handle all transpositions). Could you give examples, given that I may be
able to reproduce it with some big bases I have ?
>
> Another example:
> 1.e4 d5
> Now I want to transpose asap into a basic Caro-Kann. Note that the move
> 2.d4
> is not in the tree list at all..
> 2.d4
> Hm, still 8000 games saw this position before. Now the intended 2...c6 is
> in
> the list, but has statistics on only 236 games...
> 2... c6
> Back on track, with 72000 games....
Yes, of course. This is due to transposition. I you play
1. Nf3 Nf6
2. Ng1 -> 20 games
2. ... Ng8 -> 3M games
because you went back to start positions. And yes, Tree window handles
positions, not moves (see the code in file tkscid.cpp). This is why you see
again 3 M games, and not 20.
>
> So I definitely prefer an attempt to simply prune illegal moves from the
> tree
> window.
This has some drawbacks, even if it seems at first sight logical.
Pascal
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