0 a game played on a piece of paper in which two players write either O or X in a pattern of nine squares. It is won by the first player who places three Os or three Xs in a straight line.
A robot was displayed in the entrance hall, inviting the visitors to play a game of tic-tac-toe.
In a triple system, six triples will be called a tic-tac-toe if they intersect each other like the rows and columns of a (3 x 3) tic-tac-toe board.
It featured several new games, including tic-tac-toe, an animal matching game, and a clip art storybook illustrator that could save players' storybooks.
If the problem domain is playing simple board games, then tic-tac-toe is a problem class, and one particular game of tic-tac-toe is a problem instance.
Their only clue is mysterious symbol in shape of tic-tac-toe.
The game tree for tic-tac-toe is easily searchable, but the complete game trees for larger games like chess are much too large to search.
The first player to achieve a tic-tac-toe (three in a row horizontally, vertically, or diagonally) consisting entirely of "classical marks" is declared the winner.
He wrote his first computer program on this machine: an implementation of tic-tac-toe that allowed users to play games against the computer.
