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'L-ateral Thinking' printed from http://nrich.maths.org/

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This game is said to have been invented by Edward de Bono. The rules are simple, it is easy to make your own 4 by 4 board and pieces, and the game starts with the pieces in the positions shown. Each player has one L-shaped piece and there are two single square pieces that either player can move. None of the pieces can overlap, and the object is to block your opponent as you lose the game if you can't move when it is your turn. A turn consists of first picking up your own L-shaped piece and putting it down in another position on the board and then you may move either one of the squares if you choose to do so but not both of them. Can you develop a winning strategy to beat the computer every time?