When playing 4-4 and your opponent responds with the 3-3 invasion, seems like there are three good ways to respond. I exclude the old single hane since consensus seems to be that’s too weak. I’m curious to hear people’s opinion on when to choose from these.
- Double hane. I believe this is good when the corner is more valuable than the outside, especially if the wall you would otherwise build on the outside doesn’t have supporting stones or especially if it’d be threatened by opposing stones. Con is you lose sente.
- Knight’s move. Made popular by AlphaGo. Builds the outside and you have the benefit of keeping sente. Especially good when the outside has support for building a base.
- Simple extension. Same benefits as #2, but it gives up more territory. So I’m not sure why you’d want to play this, but I see it’s popular.
Do you agree or disagree with my assessment of #1? Under what circumstances is #3 better than #2?