ViceVersi is an abstract strategy game for 2 players. You can play it immediately if you have Othello/Reversi.
As setup, arrange 64 double faced disks as the checkers pattern (as the diagram above). The object is to connect all your color orthogonally on the board.
GAMEPLAY
At first, white choose a disk facing black color up and flip it over.
Then black takes turn and from then on, players alternate turns taking one of two action below.
(1. Choose a pair of disks with opponent’s color facing up that are orthogonally sandwiching one of your color disk or an unbroken line of your color disks, flip them over to friendly color. You may not divide an opponent’s group to two or more groups by this action, unless it makes your winning condition.
(2. Choose a disk with your color facing up, flip it over to opponent’s color. It is required the target disk is not a part of your largest group, and adjacent the largest group of opponent’s color.
If both players achieve the winning condition simultaneously, the turn player wins.
-description from designer