TSA 2012 · Question 37 · Logic
SaveThe Ruritanian Go Kart Drivers' Championship is decided over a series of 9 races. For each event the winner is allocated 10 points, second gets 8 points and third gets 5 points. All other finishers are given 1 point. The championship leaders' placings are shown below and the drivers all finished in each race.

Which was the earliest race after which one of the leaders knew he could not win the Drivers' Championship?