Tic tac toe Part 1
Two players are about to play tic-tac-toe on a 4-by-4 grid. If Player 1 were to place a cross intelligently such that it blocks off as many winning paths as possible, what fraction of the number of winning paths are left?
Details and Assumptions
In a 4-by-4 tic-tac-toe game, forming a row of three still yields a win.
A winning path is a row that can yield a win. (i.e. Any row of three).
Diagonals are included in rows of three.
The fraction numerator and the denominator are coprime integers.