Skip to main content
### Number and algebra

### Geometry and measure

### Probability and statistics

### Working mathematically

### For younger learners

### Advanced mathematics

# Drips

### Understanding Nim

There are many internet resources that will tell you how to win at Nim, but at NRICH we found them all to be rather unsatifactory. Sometimes it's not enough to know the secret of winning - and the curious amongst us want to know why it works and how it was discovered. With those thoughts in mind, we've developed an animation called 'Drips' that we hope will allow you to discover the secret for
yourself. It's still not totally straightforward so be prepared to dwell on the problem for some time. You will find the animation at https://nrich.maths.org/drips. It's tablet and phone friendly.

Full Screen Version

## You may also like

### Teddy Town

### Four Triangles Puzzle

Or search by topic

Age 7 to 14

Challenge Level

- Game

Full Screen Version

There are nine teddies in Teddy Town - three red, three blue and three yellow. There are also nine houses, three of each colour. Can you put them on the map of Teddy Town according to the rules?

Cut four triangles from a square as shown in the picture. How many different shapes can you make by fitting the four triangles back together?