Brumbies coach Stephen Larkham admits Super Rugby Pacific's final-four playoffs stage remains their Achilles heel heading into tonight's semifinal with the Chiefs in Hamilton. 

The Canberra side have lost four consecutive semis in Aotearoa, and haven't made a final since 2013. 

Larkham's been asked if they've learned from those experiences. 

The winner will face the Crusaders In next week's grand final. 

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