This problem is from another of my favorite tsumego collections, 傑作詰碁辞典 or ‘Collection of tsumego masterpieces’ by Sekiyama Riichi, Sekiyama Toshio, and Sekiyama Toshimichi.
Sekiyama Riichi is famous for winning the first Hon’inbō tournament in 1941; Sekiyama Toshio is his son; and Sekiyama Toshimichi is Toshio’s son. As a fun trivia, the ‘Ri’ in Riichi is written with the same character (利) as the ‘Toshi’ in his child’s and grandchild’s names.
Black to play.
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