The game of crosscram was created by Goran Anders son and discussed in an article by Martin Gardner; the game is now more usually referred to as domineering and has attracted the attention of a number of mathematicians since its original presentation in 1974. An analysis of the various configurations is given in the book Winning Ways for Your Mathematical Plays and the result obtained for best play on boards of different dimensions has been given in an article [3]. However, the mathematical formalism is probably rather difficult for individuals who are not familiar with the notation used in game theory. Consequently, we adopt, here, a simpler approach, which should enable readers to play interesting games and possibly to explore some of the mathematical ideas behind the sequential placements of the pieces without becoming too enmeshed in the mathematical formalities. We have used the game successfully in a number of maths masterclass sessions and found that the competitive interactions and strategic aspects are very positive for pupil groups of all ages above ten.
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