TomaLexi: Depending on model and AI reading depth, A is sometimes the AI preferred move, as its just a different type of game. Yes, B is more active, but it dares black to invade the lower area immediately, while A is a slower game with less complications on both sides.
I'd suggest both A and B should be correct.
caranthir: The choice between A and B really gives Katago a hard time. I marked A too as correct for now with some accompanying explanation, because there really isn't any quantifiable difference. I hope the author doesn't mind.
The choice between A and B really gives Katago a hard time. I marked A too as correct for now with some accompanying explanation, because there really isn't any quantifiable difference. I hope the author doesn't mind.