You play black and go first. Tap a square with a small dot to place a disc there. Any white discs that end up trapped in a straight line between your new disc and another black disc turn black. Corners are the best squares to grab, and the squares right next to a corner are risky. When neither side can move, the player with more discs wins.
Inspect a placement without changing the board. Check which corners white could take next.
+ = your placement · dashed ring = flipped disc · ! = white corner reply