Gokyo Shumyo, Section 3, Problem 64

White to play  

Hint
Attempts?
Solution
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kmr - Extremely interesting problem because its from real pro game (with minor changes made by Hayashi Genbi).Once again Unbeatable Go Saint proved his supreme skill over a board (Dosaku-Chitetsu 2h W+R 1674).

Lower part of board in real game is like that:

White to play  

White has some weakness around "b" and "c", so black can try (and did in real game) to jump at "d", but Dosaku skilfully sacrificed his stone (between "b" and "c" points), and killed black group.