Kakugawari (角換わり)System
When Bishops are exchanged early in the game, the opening is called Kakugawari Note in the exmpales below how both player avoid exchanges of Rook's Pawns.
Bogin (棒銀=Climbing Silver) system
Here is an example of the Climbing Silver System
Hayaguri gin (銀) System
Here is an example of Kusari gama gin system
Koshikake Gin (腰掛銀=Sitting Silver) with Bishops exchanged
This demo is famous (or almost historical) Kimura Joseki (木村定跡) to the end.