Hmm I don’t think it’s a ko. Black can play A12. White can only play A13 and black plays A17. After that white plays A11, black plays A15 to live. B9 and B19 are miai.
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They were still in the private mode, but are available now.
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There is something wrong with the solution, and I don’t see a way for black to kill white.
Summary
why white would answer bT18 with wS17 instead of wT17? The clamp bT16 doesn’t actually work following wT17 (white can just take bT18 with wT19. And the solution’s response wS15 would just let white live after these exchange
For this to be a valid tsumego, I think there has to be one extra black stone on the outside like Q14 or Q15.
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The book I got this one from is in my club’s library. So I can’t check it now. Hope I will not forget it checking it later.
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