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Who played first? (Posted on 2004-05-07) Difficulty: 3 of 5
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.)

See The Solution Submitted by e.g.    
Rating: 3.7000 (10 votes)

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solution | Comment 12 of 27 |

i'm gonna refer to the spots in logistic terms (north, south, east, west, NE, etc) and the middle spot will simply be M

O went first because X has seemingly no offensive moves.

O went in SE then X went in S in order to block one of the three outlets for the SE spot

O went in NE so X blocked in E

O went in N so X blocked in NW


  Posted by A on 2004-05-08 09:44:21
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