Tic-tac-toe (or “Noughts and Crosses”) is a game simple enough to implement in any computer system: indeed it’s often used in beginner’s programming courses. A more challenging project ...

On the beach, scratching marks in the sand with a stick, my 4-year-old son was already good enough to force a draw in noughts and crosses, also known as tic-tac-toe. In case there is anyone on the ...