A joseki is a line-of-play (or “variation”) that is considered best play for both sides.
These are typically patterns that come up often in professional play.
While “joseki” usually refers to corner variations, they can be for any area, but in this lesson I’ll be discussing the corners only.
Also joseki are typically for the 19×19 board.
There are hundreds or perhaps thousands of joseki but you don’t need to worry about memorizing them. Just try to understand what’s happening and gain a feel for them.
To claim a corner, a player typically plays either the star point (at Q4), 1 or 2.
A is the same as 1, and B and C are special strategies that aren’t seen very often.