Author: Roberto Waldteufel
Date: 10:22:57 04/10/99
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On April 10, 1999 at 05:46:49, Ola Mikael Hansson wrote: >On April 09, 1999 at 00:00:55, Roberto Waldteufel wrote: > >>On April 08, 1999 at 22:56:04, Christophe Theron wrote: >> >>>I'm wondering if the concept of QSearch applies to >>>Othello/Reversi too? >>> >>>Do they use extensions >>>in Reversi? > >Some programs do use extensions, mainly for the corner-squares (and also, >in some cases, for the squares adjacent to the corners). > >Also, at least one program has a table of the possible edge configurations, >labeling each one of them as stable or unstable. If an edge configuration >is unstable, it extends the search by trying moves on that edge. > >Most programs, however, use no quiescence search at all or very little. >This is probably due to that othello is mainly a positional game and not >a tactical, so the static evaluations of a position aren't very volatile. > >>1) How common is zugzwang? If it is rare, then null move is called for. > >Hmm... what other games than chess has null move been successfully used in? > >/Ola Qbic - ie 3-dimensional tic-tac-toe - is an example of a game where null move is absolutely safe, since zugzwang is impossible in that game. No move by either side can ever make a position worse than it would be if you did nothing. Best wishes, Roberto
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