----- Original Message ----
> From: Don Dailey <[EMAIL PROTECTED]>
> 
> MCTS really feels to me like a superb book building algorithm.
> Computer Chess books (at least the automated part) are built essentially
> by taking millions of games from master play and picking out the ones
> that seem to work best.   Those games are like playouts.   The moves
> that score the best are played the most.   We have a kind of MCTS here.


Interesting, the book moves are not generated by random playouts, but by 
professional ( or highly skilled ) players. 

In the Chess world, what is meant by "picking out the ones that seem to work 
best?"

My impression is that computer go programs do not, at this stage in their 
evolution, make good use of professional book moves; too much professional 
knowledge is actually in the part of the tree which is almost never played in 
pro-pro games - the "how to beat up on mistakes" and "what not to do when 
playing against a pro" parts of the tree. 


      
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