Canoe Polo

Had the opportunity to watch my son and others playing canoe polo today. Fast and furious action, very physical. To the uninitiated (ie me) there was a lot of barging, pushing, clashing of boats - and a lot of clever tactics to prevent the other team from getting the ball. However, riding your boat on top of your opponent's is not, I think, a valid manoeuvre (although it seemed to happen a lot).