The game tree window shows all variations of the current game as a graph of nodes.
Nodes are displayed as a black or white stone with a move number, if the node contains a move, a symbol containing four small stones for nodes containing setup stones or a gray diamond for other nodes. Nodes that contain a comment have 3 small black lines under the node. The current node is marked with a red cursor.
If a node is clicked on, the shortest path from the current node to the target node is computed and a series of undo and play commands is sent to the Go program to go there.