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Worcester posted their biggest-ever score in Europe as they ran in 13 tries against Spanish side Bizkaia Gernika in the Amlin Challenge Cup.

Worcester secured their bonus point in half an hour through Matt Kvesic, Blair Cowan, Ben Howard and Andy Short.

Short's second and Paul Hodgson rounded off an ill-tempered first half that saw both sides briefly reduced to 13 men.

Second-half tries came from George Porter, a second each for Howard and Hodgson, Max Stelling (3) and Alex Grove.

Joe Carlisle added 20 points from the tee, while Federico Mazzochi managed to grab a second-half try for the hosts.

Bizkaia Gernika: Dias; Lasa, Astarloa, G Zabaloy, Magunezelaia; Hernandez, Amosa; Mirones, Cusack, I Olaeta, W Wilson, Torres Suar, F Mazzochi, Iraizoz, Salas.

Replacements: Urrutia, Bilbao, Monje, Duran, Lopategi, Etxebarria, Martitegi, Garcia.

Worcester: Pennell; Howard, Clarke, Matavesi, Short; Carlisle, Hodgson; Ceri Jones, Hayes, Currie, Chris Jones, Gillies, Best (capt), Kvesic, Cowan.

Replacements: Shervington, Porter, O'Donnell, Schofield, Abbott, Frost, Stelling, Grove.

Attendance: 500.