Black needs to be thick on the outside in order to kill the corner cleanly. Variation A: This requires a favourable ladder. Variation B: White's kosumi doesn't work. Black can kill white unconditionally. Variation C: White can play A to start a two-step ko. If white plays B, white dies unconditionally. Black can connect at O2 and white … Continue reading Kill 3-3 invasion in star point small knight enclosure
White invades and black tries to kill it with a kosumi. How can white live in the corner? Attaching at 1 is a hard move to find! After black turns, white can play 2-2 to make a connection to either side.
I am sure everyone is familiar with the variations when white jumps at A, but jumping on the other side is also possible. Black would probably want to cap at 1 since white doesn't play there. Afterwards, R14 and H3 are miai. Attaching at 1 is a common way to deal with the invasion, but ataring … Continue reading Kobayashi Opening II: Large knight approach
Black can connect underneath. Notice that if the marked stone is at A, black cannot do this. If white descends, black's blocking at 4 is very pleasant. White 3 can also be at M4. White can also play the shoulder hit. White will become very thick in the center. Black's marked stone would be in … Continue reading High Chinese Opening
1. 3-3 invasion under a star point Black's descend at G19 is sente. Black can kill the corner if white tenuki. 2. 3-3 invasion under a 4-4 large knight enclosure This descend is sente. 3. 3-3 invasion under a 4-4 large knight enclosure This descend is sente. This is a multi-step ko for black. 4. The order … Continue reading Life and Death: Common Shapes in the Corner
Today I learned a tesuji for settling a weak group from Michael Redmond's commentary on Master(W) and bandari(B). White has a weak group on the top needs to settle. The combination of 2 and 4 is a common tesuji. What white wants is black to hane on the outside, white is planning to crosscut. If black just extends, … Continue reading Tesuji for settling a weak group