The current Rugby World Cup format is four groups of five teams. The five teams in a group all play each other once, a total of ten games in each group. When all the matches in the groups have been played, the top two teams in each group (a total of eight teams) progress to the quarter finals. The other teams play no further matches.
In the quarter finals the top teams in each of the groups play a game against the second-placed team from another group.
The winners of the four quarter-final games progress to the semi finals, and the four losers play no further matches.
In the semi finals, the two winners progress to the final, with the winners of the final becoming World Champions; the two losers play a Third-Fourth play off.
The questions is, what is the largest number of teams that can finish the tournament having lost exactly one game?
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Answer at 9.00 on Monday