Author: Gian-Carlo Pascutto
Date: 09:43:47 08/22/02
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On August 22, 2002 at 11:13:46, Robert Hyatt wrote: >If you don't see the difference, pick up any good AI book. Most all cover >it. Reducing the depth is reducing the depth. It is not the same thing >as saying "I choose to throw this move out at this ply and not even consider >it at all". razoring says "this move looks suspiciously bad. Rather than >just throwing it out, I am going to search it to a 1-ply reduced depth, so that >if it _does_ do something good, I will have a chance to see it with the reduced >search." Which is exactly the same thing. Pruning cuts the move you apply it to. Razoring cuts the frontier moves below the subtree your razor. >Forward pruning will result in outright blunders. By pruning a single move >you miss the fact that that move kills you. Or kills your opponent. Even >if the threat is very shallow. Razoring doesn't hide the shallow threat at >all, which is the point... Razoring does hide the 'shallow threats' at the moves it *prunes* (which are not the same as the ones you apply the razoring to). -- GCP
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