posetcay: Ok I revamped the problem drastically, there is only 1 correct solution now instead of too many. Please let me know what you think of the new version.
d4rkm4tter: @posetcay I was debating this exact problem with another user via mail today. You turned off merge recurring positions which I wanted to do too because it fixes the problem. This problem showed incorrect for correct branches that were merged in rating mode. I will investigate why.
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Edit: There is still something going on with this problem showing some correct branches as incorrect. Maybe because there are more than 15 correct sequences.
posetcay: I don't remember turning that setting off for this specific problem, but regardless I tried to trim the solution tree by removing some unimportant continuations to fix the issue you mentioned, maybe it will work properly now.
posetcay: I added it, along with some other missing sequences (R17-S17-T16/T18 and T16-S17-S18/T17). It is a very weak shape so there are too many moves that kill.
acosmicjoke: It marks C3B3E2 as incorrect, but I think the corner is dead after that. If the player in the corner answers with B1 than A2, if A2 than B1, and if B2 than reduce eyespace from outside with D1.
Ok I revamped the problem drastically, there is only 1 correct solution now instead of too many. Please let me know what you think of the new version.