This page requires that javascript be turned on in order to display as intended. There is plenty more to be said about the subtle sequencing on the Go board.
Various bystanders pile in with comments.
When the dust settles, after a brisk discussion, there is quite an interesting story to tell about analysing Go. Seems that chess GM Kotov first explicitly wrote down the professional way of looking at game analysis. The future plays in a game of complete information form a tree-like structure. Looking ahead in the game is a matter of visualising mentally some path or part of this tree. Fundamental to computer gaming is the machine's ability to operate on such trees as data structures.