shai: After P16, Q18, the solution is Q15. I chose P15 and it says it is wrong. I checked with Katago and she prefers P15 to Q15. More generally with Tesuji training problems the issue is that there are no explanations here. With life and death the correct solution can be logically proven but with tesuji "play best move" it's not as clear cut
Ivan Detkov: Indeed, the choice between D15 and E15 is strange here.
Indeed, the choice between D15 and E15 is strange here.