Lines of Action (LOA) is a board game invented by Claude Soucie.
Play alternates between Black and White, with Black moving first. Each move consists of moving a piece of your color horizontally, vertically, or diagonally onto an empty square or onto a square occupied by an opposing piece, which is then removed from the board. A piece may jump over friendly pieces (without disturbing them), but may not cross enemy pieces, except one that it captures. A piece must move a number of squares that is exactly equal to the total number of pieces (black and white) on the line along which it chooses to move (the line of action). This line contains both the squares behind and in front of the piece that moves, as well as the square the piece is on. A piece may not move off the board, onto another piece of its color, or over an opposing piece.
To move a piece, click on the piece and then click on the square to which you wish to move it. The Settings menu allows you to choose which side(s) are played by automated players, and to set a random seed that provides any random factor that the automated players may choose to use (so that they play identically when given the same seed).