Go

Go (Weiqi, Baduk) — surround more of the board than your opponent. Black plays first; White receives 6.5 points komi. Choose a 9×9, 13×13 or 19×19 board and play the computer (five levels) or a friend.

• Place a stone on any empty intersection by tapping it. Stones never move.
• Capture: a group with no empty neighbouring points (liberties) is removed.
• Suicide (playing where your own group would have no liberties without capturing) is not allowed.
• Ko: you may not immediately recapture a single stone that just captured a single stone — play elsewhere first.
• Pass when there is nothing useful left. After two passes in a row the game ends.

Scoring

After both pass, tap any groups that are dead (cannot avoid capture) to mark or unmark them — the computer suggests them for you. Then press Accept score. Area scoring is used: your stones on the board plus empty points surrounded only by your stones. Highest total wins. Resume returns to play if you disagree.

Tips

Corners are easiest to secure, then sides, then the centre. A group needs two separate eyes to live. Undo takes back a move; games are saved automatically.