15kyugo: I discovered the method to replicate the error. First solving the problem, then click "review" and play some steps in the "review". After that, when resetting the game and solving it once more, an alternative response move will appear with a textbox above shown "Correct, but what about this answer?". Once this appears, no move will be marked as "CORRECT".
d4rkm4tter: Couldn't reproduce it, but maybe I'll find out later.
15kyugo: I have solved the problem with the 1st step T17 when the opponent replies with R16. But if the opponent replies with T16, it seems that no matter which step I play, 'INCORRECT' is shown.
Sadaharu: There's no reply with T4 registered in the file
I discovered the method to replicate the error. First solving the problem, then click "review" and play some steps in the "review". After that, when resetting the game and solving it once more, an alternative response move will appear with a textbox above shown "Correct, but what about this answer?". Once this appears, no move will be marked as "CORRECT".