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What is pruning and how much do I lose by not using it?

Posted By: Michael Petch
Date: Tuesday, 4 August 2009, at 11:47 p.m.

In Response To: What is pruning and how much do I lose by not using it? *NM* (Jason Lee)

Pruning in Gnubg neural net effectively prunes away potential moves within a deeper ply search. Throwing away potential moves (and the trees associated with that move) increases GnuBG's speed. You will get slightly better results with no pruning. As for time saved.. I would say at least 33% faster on average (but it may be more - I haven't done much timing).

The slight loss in strength was believed to be negligible based on testing that was done. I think 1 in every one hundred moves may be different between pruning or no pruning, and when they differ the difference in equity was generally found to be minor.

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