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Re: [Bug-gnubg] [Fwd: gnubg search function]
From: |
Thomas Hauk |
Subject: |
Re: [Bug-gnubg] [Fwd: gnubg search function] |
Date: |
Thu, 27 Mar 2003 12:22:53 -0700 (MST) |
On Fri, 28 Mar 2003, Joseph Heled wrote:
> Would you care to enlighten us a little more, say by explaining how it
> would speed up a 1ply search? Just a rough idea would do.
The algorithm wouldn't speed up a 1-ply search; at 1-ply, all children of
the root node are guaranteed to be expanded (because it is a max node).
The benefits of search algorithms like alphabeta and *-minimax is they
reduce the complexity of deep searches.
Alphabeta uses upper and lower bounds on what can be acheived to create
cutoffs. For example, if you are searching in a part of the tree where
you have a move that guarantees you a score of at most 10, but you
already know of a move that will guarantee you a score of 12, then you can
cut off search there because there's no sense looking around for a move
worse than you already have.
*-minimax works on the same principle, but uses a weighted sum of the
moves beneath a chance node to determine upper and lower bounds.
--Tom
- [Bug-gnubg] [Fwd: gnubg search function], Achim Mueller, 2003/03/26
- [Bug-gnubg] [Fwd: gnubg search function], Øystein Johansen, 2003/03/27
- Re: [Bug-gnubg] [Fwd: gnubg search function], Joern Thyssen, 2003/03/27
- RE: [Bug-gnubg] [Fwd: gnubg search function], Albert Silver, 2003/03/27
- Re: [Bug-gnubg] [Fwd: gnubg search function], Jim Segrave, 2003/03/27
- RE: [Bug-gnubg] [Fwd: gnubg search function], Albert Silver, 2003/03/27
- RE: [Bug-gnubg] [Fwd: gnubg search function], Thomas Hauk, 2003/03/27
- RE: [Bug-gnubg] [Fwd: gnubg search function], Thomas Hauk, 2003/03/27
- Re: [Bug-gnubg] [Fwd: gnubg search function], Joseph Heled, 2003/03/27
- Re: [Bug-gnubg] [Fwd: gnubg search function],
Thomas Hauk <=
- Re: [Bug-gnubg] [Fwd: gnubg search function], Joseph Heled, 2003/03/27
- Re: [Bug-gnubg] [Fwd: gnubg search function], Thomas Hauk, 2003/03/27
- Re: [Bug-gnubg] [Fwd: gnubg search function], Joseph Heled, 2003/03/27
- Re: [Bug-gnubg] [Fwd: gnubg search function], Thomas Hauk, 2003/03/27
- Re: [Bug-gnubg] [Fwd: gnubg search function], Joern Thyssen, 2003/03/27