An Unusual Capture

This situation looks like the illegal move in Go, but it's different.

The difference is that as soon as the black stone is put onto the board, the two white stones are captured and so removed from the board.

That capture leaves the lone black stone with one line touching it (on the right-hand side). The lone black stone is not completely surrounded.

It is true that white could capture the lone black stone in the very next move. That's all right. That would be a legal move. But if you're playing the capturing game, then black has already won, and the game is over!

You may want to compare this with a simple example of capturing 2 stones.

You can also look at a rather different example of this same kind of legal capture.

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