Rules & objective
Three pieces each start on opposite sides of the octagon. Alternate moving one piece along one drawn edge to an empty neighbor, around the rim or through the center. No jumps or captures. Win with your three pieces on a straight diameter: the center and two opposite rim points. Digital choices: a player with no legal move loses; the same board and player to move three times draws.
Controls
Play directly on the cards or board with mouse or touch. Coordinate selectors are optional keyboard aids.
Worked example
The central intersection links several routes. Before occupying it, check whether your opponent can complete a permitted three-piece line next turn.