Annexation Cross is played on a 8x8 cross-shaped grid.
Two players called Dark (black) and Light (white). Each player puts one piece per turn on the board. The piece must be put on a space so that it sandwiches one or more of the opponent's lines (diagonal or vertical). The sandwiched disks are flipped to the color of the current player.
If a player can not play, he must pass his turn.
The game is over when both players can not play. The player with the most pieces wins.
Letters for columns and numbers for rows, start at top left with A1.