NAME
    Games::Go::SimpleBoard - represent a simple go board

SYNOPSIS
       use Games::Go::SimpleBoard;

DESCRIPTION
    Please supply a description )

  EXPORTED CONSTANTS
    Marker types for each board position (ORed together):

       MARK_TRIANGLE # triangle mark
       MARK_SQUARE   # square mark
       MARK_CIRCLE   # circle mark
       MARK_SMALL_B  # small stone, used for scoring or marking
       MARK_SMALL_W  # small stone, used for scoring or marking
       MARK_B        # normal black stone
       MARK_W        # normal whit stone
       MARK_GRAYED   # in conjunction with MARK_[BW], grays the stone
       MARK_LABEL    # a text label
       MARK_HOSHI    # this is a hoshi point (not used much)
       MARK_MOVE     # this is a regular move
       MARK_KO       # this is a ko position
       MARK_REDRAW   # ignored, can be used for your own purposes

       COLOUR_BLACK  # used for $board->{last}
       COLOUR_WHITE  # to mark the colour of the last move

  METHODS
    my $board = new $size
        Creates a new empty board of the given size.

        "$board->{max}" stores the maximum board coordinate (size-1).

        "$board->{captures}[COLOUR]" stores the number of captured stones
        for the given colour.

        "$board->{last}" stores the colour of the last move that was played.

        "$board->{board}" stores a two-dimensional array with board
        contents.

    $hint = $board->update ([update-structure...])
        Structure is

           [$x, $y, $clr, $set, $label, $hint] # update or move
           []                                  # pass

        and changes the board or executes a move, by first clearing the bits
        specified in $clr, then setting bits specified in $set.

        If $set includes "MARK_LABEL", the label text must be given in
        $label.

        This function modifies the hint member of the specified path to
        speed up repeated board generation and updates with the same update
        structures.

        If the hint member is a reference the scalar pointed to by the
        reference is updated instead.

        Example, make two silly moves:

          $board->update ([[0, 18, -1, MARK_B|MARK_MOVE],
                           [0, 17, -1, MARK_W|MARK_MOVE]);

    $board->is_valid_move ($colour, $x, $y[, $may_suicide])
        Returns true if the move of the given colour on the given
        coordinates is valid or not.

  AUTHOR
    Marc Lehmann <schmorp@schmorp.de>

  SEE ALSO
    KGS::Protocol, KGS::Game::Tree, Gtk2::GoBoard.