Chuban

Chuban refers to the middle phase of a Go game, following the fuseki (opening) and leading into the yose (endgame). This stage is marked by intense battles, territorial expansion, and strategic invasions. Unlike the opening, where players focus on broad positioning, middle game revolves around local fights, attack and defense, and adapting to the opponent’s plans. It is the least developed in terms of theory and the most unpredictable part of the game.

During this phase, players evaluate the strengths and weaknesses of different groups, deciding when to attack, defend, or invade an opponent’s territory. Efficient chuban play requires strong reading skills, shape recognition, and the ability to manage both local fights and global influence.

Examples of Middle Game Situations

1. Invasion of a Large Moyo
   A player enters an opponent’s framework, aiming to either settle a group inside or force a beneficial exchange.

2. Attack and Defense in a Capturing Race
   Groups with weak structures engage in a semeai (capturing race), where precise move order determines survival.

Mastering chuban is essential for Go players, as the middle game sets the course for victory by shaping the final territorial balance and preparing for the endgame. Thankfully, we have a whole course about transitioning to the middle game. Additionally, we offer a free video about the two most important aspects of the middle game: attack and defense.