### Achi

This game for two players comes from Ghana. However, stones that were marked for this game in the third century AD have been found near Hadrian's Wall in Northern England.

### Yih or Luk Tsut K'i or Three Men's Morris

Some puzzles requiring no knowledge of knot theory, just a careful inspection of the patterns. A glimpse of the classification of knots and a little about prime knots, crossing numbers and knot arithmetic.

### Stop or Dare

All you need for this game is a pack of cards. While you play the game, think about strategies that will increase your chances of winning.

# Lambs and Tigers

##### Stage: 3 Challenge Level:

The game of Lambs and Tigers is only one of 60 wonderful games from the book "Board Games Round the World'' published by Cambridge University Press 1988 and written by Robbie Bell and Michael Cornelius. This is an excellent resource book for mathematical investigations.

This is a game played by Hindu children in India. One player has 3 tigers and the other 15 lambs. Pieces are placed alternately on the board shown above for the first three moves, the tigers being placed on the points marked 'T' and the lambs on the other points. Thereafter the player with the lambs continues placing them on the board, while the player with the tigers may either move a tiger to an adjacent point or 'kill' a lamb by jumping over it and removing it from the board - several single lambs may be killed by a series of jumps in one move. Lambs cannot move until all 15 have been introduced, when they can move to an adjacent point. The tigers seek to destroy all the lambs while the lambs try to hem in the tigers so that they cannot move.