## puzzle

Which gives a tighter fit: a square peg in a round hole or a round peg in a square hole?

The *n*-th birthday of a very famous mathematician coincides with a year that corresponds to the (*n*+1)st prime number. Who is this mathematician?

It's 21st of October and for puzzle lovers this can only mean one thing: the G4G Celebration of mind. This annual party celebrates the legacy of Martin Gardner, magician, writer and father of recreational maths, with mathemagical events in his honour happening all over the world.

Write the number 2011 using only the digit 4 and the operations of addition, subtraction, multiplication, division, exponentiation, taking a square root and factorial. You can use any number composed of the digit 4, even if it's decimal, so 44 and 44.44 are both allowed. You're also allowed to use brackets.

Football tables have been the basis of many a brainteaser over the years. These two puzzles ask you to work out what the scores were in all matches played so far this season.

How many pieces can you make out of a cube of cheese using a cheese wire?

Here is the solution of our puzzle Finding the nine. Did you get it right?

If you think you know how to use the numbers 1 to 9, then try our challenge!