Tsumego from Games 74

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Shusai (W) vs Nakagawa Senji, white to play

This is the sixth and last game of the match played between Shusai and Nakagawa Senji in 1908. Black played B1 as a ko threat, and white ignored it. After B3, white played one more move and then black resigned. What is white's next move?


/Attempts
/Solution?


This is a copy of the living page "Tsumego from Games 74" at Sensei's Library.
(OC) 2011 the Authors, published under the OpenContent License V1.0.
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