Living Cosmos

From the highly recommended “Fundamental Principles of Go” by Yang Yilun

Class One: Play in an empty corner

Class Two

1. Approach/enclose a 3-4, 5-3, or 5-4 corner
2. Play the midpoint of a side where there is good development potential
3. Start a fight (joseki) in a corner

Class Three

1. Play the midpoint of a side where one opponent has good development potential
2. Make an extension which simultaneously strengthens you and weakens your opponent
3. Approach/enclose a 3-3 corner
4. Approach/enclose a 4-4 corner

Class Four:

1. Play midpoint where neither side has good development potential
2. Make a 3rd enclosure move in a 4-4 corner or reduce an enclosed 4-4 stone corner
3. Make any remaining 2 or 3-space extension