Observe, choose, check
In brief
A capture at the edge
A capture at the edge
In the diagram, the white stone is at B1. The black stones at A1 and B2 take away two of its liberties. C1 remains: if Black plays there, the white stone is captured.
Which move captures the white stone?
Show the answer
C1 removes the last liberty of B1. The edge of the board does not count as a liberty.