[computer-go] Big trees

[Michael Williams]

Now that I have this system of generating really big game trees, what sort of interesting things could I do with it?  The exact number of nodes I can store is 
not exact because I'm doing various things to reduce each node's footprint when it goes to disk.  I'm currently building a tree that is bushy at the root (heavy 
exploration term) and normal UCT beneath that.  It is at 28 billion nodes now and projecting a capacity of 122 billion.  The current node rate is about 130k per 
second (on 1 Core2 core).  This is on a 9x9 board.  I'm still using Libego for playouts.  And I'm deleting symmetrically-equivalent moves from the tree.  That 
is all that gets pruned.

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