Given this tic-tac-toe position, as played by two expert players, who went first and where? Also, which was the last "move"?

 X | O | O 
---+---+---
   |   | X
---+---+---
   | X | O

(An expert player is a player who would never play in such a way that would allow his opponent to win, and who would also try to get the possible best result.)

(In reply to No Subject by Sam)

If O went in the bottom right first, then X blocked by placing the first X in the bottom center square...

Then O has a guaranteed win by moving in the center square (X forced in upper left, O then goes in upper right and wins on next move).

Since, O didn't move in the center square, your scenario is impossible.

Edited on May 7, 2004, 4:52 pm

Posted by Thalamus on 2004-05-07 16:50:08