[Fachtna Kelly](http://twitter.com/fachtnak) looks ahead to must-win games for Leinster and Munster plus a Chelsea-Arsenal London derby.
Few doubt Leinster will claim the Chiefs' scalp, but will it be enough to secure them a position in the knock-out stages of the Heineken Cup? To give themselves the best chance they'll need five points - and scoring four tries against Exeter away will be difficult.
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