Zeldy: Thanks for the answer to the suggestion.
I think it has value because the situation O2O1 seems to be more possible to happen in a beginner/intermed game than the actual answer, and the only possible solution is
O2O1N2N1M2M1L1L2P1M1. To be more precise in the answer, a stone in J1 in the problem would be perfect.
An antecipated move leads to the death of the group, as I showed in the wrong variants. That's it. Sorry for the flood in comments! This website is amazing
posetcay: It becomes a completely different problem then, which is already covered in later collections.
Zeldy: I think this problem should have an variation: O2O1N1 as a wrong alternative. It may seem like an easy solution, but can trick the player to lose the eye
For elementary tsumegos having many variations is not beneficial if the focus is clear.