Retrograde Analysis Problem 1

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This is an easy problem to start with. The position below is taken from a game Jowa 5d (w) - Genan Inseki 4d, played in 1814, which is famous for the fact that 150 stones are captured during the course of the game.

[Diagram]

Position after move 334



With move 334, White captured 34 black stones in the lower left of the board.
Which of the 33 white stones involved was this last move?!

/Attempts


This is a copy of the living page "Retrograde Analysis Problem 1" at Sensei's Library.
(OC) 2007 the Authors, published under the OpenContent License V1.0.
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