im helping my niece with her homework, the questions are as follows...

what river is the oxford cambridge boatrace?

whats the maximum possible number of sets in a mens tennis match?

how many pieces are there in draughts?

what sport is described as 'all-in'?

i actually didnt know any of these, i dont see how a 10 yr old is meant to know, but yeah, anyway whats the answer to 2 and 4?