NAME

Games::AlphaBeta::Position - base Position class for use with Games::AlphaBeta

SYNOPSIS

    package My::GamePos;
    use base qw(Games::AlphaBeta::Position);

    sub apply { ... }
    sub endpos { ... }      # optional
    sub evaluate { ... }
    sub findmoves { ... }

    package main;
    my $pos = My::GamePos->new;
    my $game = Games::AlphaBeta->new($pos);

DESCRIPTION

Games::AlphaBeta::Position is a base class for position-classes that can be used with Games::AlphaBeta. It inherits most of its methods from Games::Sequential::Position; make sure you read its documentation.

This class is provided for convenience. You don't need this class in order to use Games::AlphaBeta. It is, however, also possible to make use of this class on its own.

INHERITED METHODS

The following methods are inherited from Games::Sequential::Position:

new
init
copy
player

VIRTUAL METHODS

Modules inheriting this class must implement the following methods (in addition to "apply()" and anything else required by Games::Sequential::Position): "evaluate()" & "findmoves()".

findmoves(): Return an array of all moves possible for the current player at the current position. Don't forget to return a null move if the player is allowed to pass; an empty array returned here denotes an ending position in the game.
evaluate(): Return the "fitness" value for the current player at the current position.

METHODS

The following methods are provided by this class.

endpos: True if the position is an ending position, i.e. either a draw or a win for one of the players.
Note: Not all games need this method, so the default implementation provided by this modules always returns false.

AUTHOR

Stig Brautaset, <stig@brautaset.org>

COPYRIGHT AND LICENCE

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.3 or, at your option, any later version of Perl 5 you may have available.