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Reversi Disk Removal Game
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The inversi game is played on a conventional 8x8 game board, identical to Reversi (also known as Othello), and with 64 disks, each of which is white on one side and black on the other, again, identical to Reversi.

The rules, however, differ. There are two separate game phases, with different rules.

The first phase is as follows: The game board starts empty, with no disks on it. Each player takes turns placing one disk on the board. No flipping occurs, and both players can choose whether the disk they place is white side up or black side up.

After the last disk is placed (by the second player) the first player chooses who will be white, and who will be black. The game enters the second phase, and the second player moves next.

During the second phase, each player removes a disk of his own color from the board, and flips one or more disks of his own color to his opponent's color.

The board after the move must satisfy the following condition: if the player were to put his tile back on the board, in the location he removed it from, and flip pieces according to the rules of normal Reversi, the result would be identical to the board before he removed his disk.

If a player is unable to make any such move, he must pass. If neither player can legally remove a disk from the board, the game ends.

Whoever has the most disks left on the board at the end of the game wins.

Players may agree to skip the first phase, and start the game with some predetermined pattern (all black, all white, a checkerboard, etc) or have a computer fill the board randomly.

goldbb, Nov 18 2012


       suggested title: Versi   

       This sounds really complicated! I haven't even figured out regular Reversi strategy yet.
phundug, Nov 19 2012

       [+] and ^
FlyingToaster, Nov 19 2012

       phundug, Why Versi? That name would imply that Reversi is Versi, again.   

       If we ignore the first phase, which is really just filling the board in semi-randomly, then it's no more complicated than regular Reversi, but played backwards.   

       As for strategy (for regular Reversi), there are several books to read, but the simplest suggestion is that, during the beginning and middle of the game, try to maximize your own mobility (the number of places which it's legal for you to move) and minimize your opponent's mobility.   

       Also, it's nearly always a good thing if you can force your opponent to make a move which will allow you to take a corner on the following move. Usually, this is done by forcing him (or tricking him) into eliminating all other moves he might otherwise have made.
goldbb, Nov 19 2012

       I would play this, probably more than once.   

       I played Reversi against the computer a few times, and it always seemed to try to capture the 3rd square from the corner (along each side). So there may be something magical about those squares too.
phundug, Nov 20 2012


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