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'One, Three, Five, Seven' printed from http://nrich.maths.org/

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This is a game for two players. You will need 16 objects, like matchsticks or counters.

Set the objects out in a row of 7, a row of 5, a row of 3 and a row of just 1.

game board

Players take turns in a choosing a row then removing any number of objects from that row.

The player left with the last object is the loser.

Try playing it with a different number of objects.
Try playing it with a different number of rows.
Can you find any winning strategies?
Does it matter who goes first?

(Thanks to Chris from Active Training Education who is champion at this game!)