Numerical Tic-Tac-Toe on the n × n board is a two player game where the numbers {1, 2,. .. , n 2 } are divided between the two players (usually as odds and evens) and then players alternately play by placing one of their numbers on the board. The first player to complete a line of n numbers (played by either player) that add up to n(n 2 + 1)/2 is the winner. The original 3 × 3 game was created and analyzed by Ron Graham nearly fifty years ago and it has been shown that the first player has a winning strategy. In this paper we consider the 4 × 4 game and determine that in fact the second player has a winning strategy.
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