The Suicide Rule in Go
The suicide rule is one of Go's short, sharp restrictions: you may not play a stone that would immediately have no liberties. There is exactly one exception — if the move captures enemy stones, it is legal, because the capture gives your new stone room to breathe.
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What counts as suicide
Every stone needs at least one liberty — an adjacent empty point — to stay on the board. If you place a stone into a spot completely surrounded by enemy stones, with no empty point next to it and no capture resulting, that stone would have zero liberties. Under the common rules used in Japan and China, that move is simply illegal: you cannot play it.
The capturing exception
There is one case where filling the last liberty is allowed. If your move removes the last liberty of an enemy group, that group is captured and comes off the board first — which opens up the very points your new stone needs. Because it ends with liberties, the move is legal. Captures are always resolved before your own stone is checked.
Why the rule exists
Without it, a player could throw away stones into dead space pointlessly, and the endgame would get messy. The rule keeps the game clean: a move must either help your stones survive or capture the opponent's. A handful of rulesets (such as New Zealand and Tromp–Taylor) do allow whole-group suicide, but on almost every board you'll play, and here, single-stone suicide is not allowed.
Frequently asked questions
- Can you ever play a stone with no liberties in Go?
- Only if that move captures enemy stones. The capture is resolved first and frees up space, so your stone ends with a liberty. A move that leaves your own stone with zero liberties and captures nothing is illegal.
- Is suicide ever legal in Go?
- Under the standard Japanese and Chinese rules, no — single-stone suicide is forbidden. A few less common rulesets permit whole-group suicide, but most players, including here, treat suicide as illegal.
- How is the suicide rule different from the ko rule?
- The suicide rule forbids self-capturing moves. The ko rule prevents immediately recapturing to repeat a board position. They're separate restrictions that both keep the game legal and finite.
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