It's very interesting, involves statistics and even psychology.
I think a prime example is if you have 3 clowns set up with balloons on top their head.
A B C
Say clown A has a 70% chance of hitting, B a 40% chance, C 25%.
Now, at the exact same time, the clown has to choose which balloon to pop and eliminate the other clown.
Game theory brings this down to psychology, B and C will BOTH aim for A as with any game - you try to get rid of the biggest threat first. Or, maybe A B C will conduct different strategies?
Pretty much like that - I read it in a book called "Archimedes Revenge" - have a go, pretty simple but cool book.