Each side starts on its back line. You play orange and move first.
On your turn, move one piece one step along a line to an empty neighboring point. No diagonals, no jumping.
After your move, if a row or column has two of your pieces side by side, right next to one enemy piece, and no other pieces on that line, the enemy piece is captured.
It doesn't count if the enemy walks into that spot themselves, or if there's a fourth piece anywhere on the line (any distance, either color).
You win when the opponent has only 1 piece left or can't move. If nobody captures for a long time, it's a draw.