 Cheltenham Gold Cup-winning rider Barry Geraghty thinks Mares Chase favourite could come unstuck at the Cheltenham Festival unless she brushes up on her jumping technique. The six-year-old again proved much too good for her rivals last weekend in a Grade Two novice chase at Thurles, but not without a major scare at the first fence, ... Off The Fence: Allegorie De Vassy could struggle at Cheltenham if... 