Achi Arena
Three-in-a-row on a 3×3 intersection board with placement and movement phases.
White starts first
White
Places 4 pieces, then slides along connected lines to create a row of 3.
Black
Mirrors the same objective. No jumping, and wins count during placement too.
Match flow
8 placements remaining
- The board has 9 intersections connected by horizontal, vertical, and diagonal lines.
- Each player has 4 pieces and wins by forming an uninterrupted line of 3 of their own pieces.
- During placement, players alternate placing on any empty intersection. A line of 3 wins immediately.
- Movement begins only after all 8 pieces have been placed.
- During movement, pieces slide one step along a connected line to an adjacent empty intersection. No jumping.
- In placement, click any highlighted empty intersection to place your next piece.
- In movement, click one of your own pieces to see legal adjacent destinations.
- Selected pieces glow; legal destinations pulse softly.
- In Human vs Computer mode, input is locked while the AI is thinking.
- Undo in Human vs Computer mode rewinds to the most recent human-to-move state when possible.
Placement: contest the center early and avoid handing the opponent an immediate line on move 3.
Movement: look for dual threats that force one reply while your other line stays alive.