yah risk .
a freind of mine and i would play a total domination version . i cant remember which rule we changed, but it had to be to make it two players. sometimes it would go on for hours but would always end in one person controlling the board.
I still cannot understand how the USA supposedly has the best education system in the world when the most common problem my friends that TA have are that around half of all college level students CAN NOT use a ruler at all.