semelis: I don't understand why the sacrifice at J18 is necessary before the cut at J16.
Or the meaning of the blue colour in the variants when reviewing. I've downloaded de .sgf and those moves are missing.
d4rkm4tter: I agree that playing J16 directly works. The blue moves are the moves you played and are not in the file.
I don't understand why the sacrifice at J18 is necessary before the cut at J16. Or the meaning of the blue colour in the variants when reviewing. I've downloaded de .sgf and those moves are missing.