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 Natural TB by Marco Costalba

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st peter
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PostSubject: Natural TB by Marco Costalba   Sun May 29, 2016 3:49 pm

Posted By Marco Costalba  guitar  

Marco Costalba has modified current SF+sygyzy in a way that he has called "Natural TB".

The idea is to use TB but avoiding the unnatural TB scores and in particular the DTZ ones (hiding mates, unnatural sacrifices, etc) but retain the 'good play' of syzygy where 'good play' is defined as follow:

If in a given position SF with old syzygy leads to a win, then it should do also now with 'Natural TB'

For people interested in the technical details, let's add that I have implemented two changes to the current behavior:

1) At root, moves that do not preserve the win or the draw are skipped, but the DTZ score of the remaining moves is ignored.

2) At WDL probing time, deep in the tree, instead of returning an adjusted WDL score, only alpha, draw and beta is returned according if the position is loss, draw or win (cursed win and losses at the moment are ignored).

This is still experimental code, so maybe there is some issue moreover for the moment I have not run matches between the 2 versions, I am more interested to see if this version is more "natural" to play than the original but I expect the ELO should be equivalent between the 2 versions.

Sources are here:

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