Basic Assumptions of Joseki

Joseki has two critical assumptions:
1) Seed strength of black and white is about evenly matched.
2) Territory (地) & influence (厚势) for black and white is closely balanced.

One of the most common mistakes for dan players is to copy joseki verbatim for all types of situations. Understand that weiqi is "alive" and dynamic, our strategies need to be flexible and adapt to the surroundings of the game. Often we will encounter situations where one or both of the above assumptions is/are violated. In that case we need to carefully analyze the game to gauge seed strength and understand the balance of 地 vs 厚势.