Simultana

This game is played on a 5x5 board. Game starts with a setup position. Each player moves one of his stones orthogonally respecting the following restriction: The moved Black stone must create at least one adjacent area of 3 or 5 empty cells. The moved White stone must create at least one adjacent area of 2 or 4 empty cells. The aim of this game is trapping the opponent pieces. The first player unable to make a move, loses. The original rules suggest playing on larger boards as well - use 9 pieces per player on a 6x6 board and 14 on a 7x7 board.