** To play _Goblet_, run the "Games" application. **

"Gobblet!" is a board game from Blue Orange Games:
       http://www.blueorangegames.com/

Our 3x3 version actually corresponds to "Gobblet! Jr.", while the 4x4
version matches "Gobblet!".

The Blue Orange web site provides rules for Gobblet! Jr. and
Gobblet!. The rules below are in our own words; see also the Blue
Orange version.

Game Rules
----------

The 3x3 game is a generalization of tic-tac-toe:

 * The object of the game is to get three in a row of your color,
   vertically, horizontally, or diagonally. Size doesn't matter for
   determining a winner.

 * Each player (red or yellow) starts with 6 pieces: two large, two
   medium, and two small.

 * On each turn, a player can either place a new piece on the board,
   or move a piece already on the board --- from anywhere to anywhere,
   as long as the "from" and "to" are different.

 * A piece can be placed (or moved to) an empty space, or it can be
   placed/moved on top of a smaller piece already on the board,
   "gobbling" the smaller piece. The smaller piece does not have to be
   an opponent's piece, and the smaller piece may itself have gobbled
   another piece previously.

 * Only visible pieces can be moved, and only visible pieces count
   toward winning. Gobbled pieces stay on the board, however, and when
   a piece is moved, any piece that it gobbled stays put and becomes
   visible.

 * If moving a piece exposes a winning sequence for the opponent, and
   if the destination for the move does not cover up one of the other
   pieces in the sequence, then the opponent wins --- even if the move
   makes a winning sequence for the moving player.

 * Technically, if a player touches a piece, then the piece must be
   moved on that turn. In other words, you're not allowed to peek
   under a piece to remind yourself whether it gobbled anything. If
   the piece can't be moved, the player forfeits. This particular rule
   is not enforced by our version --- in part because our version
   supports a rewind button, which is also not in the official game.

The 4x4 game has a few changes:

 * The object of the game is to get four in a row of your color.

 * Each player (red or yellow) starts with 12 pieces: three large,
   three medium-large, three medium-small, and three small.

 * Each player's pieces are initially arranged into three stacks off
   the board, and only visible pieces can be moved onto the board.
   The initial stacks prevent playing a smaller piece before a
   corresponding larger piece.

 * When a piece is moved from off-board onto the board, it must be
   moved to either (1) an empty space, or (2) a space to gobble an
   opponent's piece that is part of three in a row (for the opponent).
   In other words, a new piece can gobble only an opponent's piece,
   and only to prevent an immediate win on the opponent's next turn.
   These restrictions do not apply when a piece that is already on the
   board is moved.

Controls
--------

Click and drag pieces in the obvious way to take a turn. The shadow
under a piece shows where it will land when you drop it.

Use the arrow keys on your keyboard to rotate the board. Use the "-"
and "=" keys to zoom in and out. Use "_" and "+" to make the game
smaller and larger. (Changing the size adjusts perspective in a
slightly different way than zooming.) Depending on how keyboard focus
works on your machine, you may have to click the board area to make
these controls work.

The button labeled "<" at the bottom of the window rewinds the game
by one turn. The button labeled ">" re-plays one turn in a rewound
game. An alternate move can be made at any point in a rewound game,
replacing the old game from that point on.

Auto-Play
---------

Turn on a computer player at any time by checking the "Auto-Play Red"
or "Auto-Play Yellow" checkbox. If you rewind the game, you can choose
an alternate move for yourself or for the auto-player to find out what
would have happened. The auto-player is not always deterministic, so
replying the same move might lead to a different result. You can
disable an auto-player at any point by unchecking the corresponding
"Auto-Play" checkbox.

Important: In the 3x3 game, you CANNOT win as yellow against the smart
auto-player (if the auto-player is allowed to play red from the start
of the game). In other words, red has a forced win in the 3x3 game,
and the smart auto-player knows the path to victory. You might have a
chance to beat the red player in the default mode, though, which is
represented by the "Ok" choice (instead of "Smart") in the "Auto-Play
Options" dialog.

Configure the auto-player by clicking the "Auto-Play Options" button.
Currently, there's no difference between "Smart" and "Ok" in the 4x4
game.
