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Like the Yorkshire board but all black.

The "optimal" dartboard rearranges the traditional positions of the numbers 1 to 20 to make them as mathematically perfect as possible.

In a standard dartboard, low numbers are placed next to high ones, so as to penalize players who miss their targets. That's why the 20, for example, is next to the 1 and the 5.

Mathematicians have long come up with improved arrangements that maximize the differences between adjacent numbers, in order to penalize mistakes as much as possible.

Now David Percy, Professor of Mathematics at Salford University, has added to the debate by designing a dartboard that adds two more constraints:

1) The numbers go odd-even-odd-even all the way round the board
2) Similar clusters are spread around the board as evenly as possible.

David says the new dartboard will make most difference at the end of a game, when the rules are that a player must finish on a double.