Unfortunately, Go is a game that has no easily-defined end-state. Unlike Connect-Four or Chess or Othello (or pretty much every other game most people know), a game of Go ends when both players agree it ends. Yes, there is the possibility that all 361 points (on a 19x19 board, which is tournament size) could be filled, but the chances of that happening are so slight that it's a non-issue.

There are a number of excellent Go tutorials out there, for people who don't know the rules, and I would suggest you read up on them. It's a fascinating game. I mean, the game has only eight(!) rules!

1. Black moves first into an empty board.
2. You can place a piece on any open spot on the board (save when noted below).
3. You capture a group of pieces when there is no spot on the board that the opponent can play that would connect to that group, either horizontally or vertically. (These are called liberties.)
4. The edge of the board does not count as a liberty for anyone.
5. You cannot repeat the same board position with the same person to move.
6. You cannot move so that you occupy the last liberty of your own group.
7. Anyone may pass their turn at any time.
8. A game ends when both players pass in succession.

That's it for the game. Everything else is dependant on your choice of how to score a game. Most games are scored using a territory-surrounded + pieces-captured formula. Territory that you control is defined as any open points that can only trace a path to the edge of the board or your pieces. Any open space that can trace back to pieces of both sides isn't controlled by anyone.

Most games on a 19x19 board generally end after about 150-200 moves. At this point, it is usually clear who has won, but not always. A tournament game of Go is usually untimed (though I think custom dictates a certain limit, which I'm not sure about).

Thus, retrograde analysis really wouldn't be able to offer much, unfortunately.

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