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Play to win with Nim
In the game of Nim one player always has a winning strategy — it depends on an unusual way of adding numbers.
Sometimes a piece of maths can be so neat and elegant, it makes you want to shout "eureka!" even if you haven't produced it yourself. One of our favourite examples is the art gallery problem.
If you thought that billiards was a harmless game to play in the pub, think again. It's a breeding ground for chaos!