:w1: is straightforward and hopefully requires no explanation. The only other feasible alternative move is D11 but it doesn't take much insight to see that it's rather slack. I'm a bit dubious of B's trigger move. The idea is correct (protecting the group) but the execution doesn't seem right as far as shape goes. I really wanted to play H11 instead of , but it seems too aggressive given that B invested another move to his group and is now pretty safe although there is still some aji.

Since he is safe, I will just make him even more safe (overconcentrated) by forcing him to invest more stones into his group that give him no points. The profit I gain from this comes indirectly from the thickness at top, as pushing him will make E10 strong and gives me more options to handle D4 and make some points on the side while his center group just fills dame.

Again, It is a no-brainer. I can't let him have G11 becasue my eye space would disappear. So I get to make eye space and neutralize his wall up top. In return he gets to start another wall.

I suspect that his next will be an extension from the wall to C6. I'm currently wondering if attaching at D6 can lead him into over-concentration.