## 27

**Combinatorial Game Theory**is a powerful tool for analysing mathematical games. Lewis Dartnell explains how the technique can be used to analyse games such as Twentyone and Nim, and even some chess endgames.

- What is maths for? - What do we hope people will know after studying maths at school?
- New Plus posters! - Find out how you can get hold of your own copy of our brilliant new poster!
- Specially for students - This issue of Plus brings you the first of an occasional series expecially for use in the classroom.

**paper folding**.