By Melissa Jones Dibble Decker landed a huge gamble in a thrilling finish to Wincanton’s Virgin Bet Best Odds Daily Handicap Chase. Backed from 20-1 to 11-2, Tom Lacey’s trainee had just enough in the tank to repel a brace of greys at the Somerset circuit. After racing for 2m 4f, long-time leader Georges Saint (2-1f) and veteran Iconic Muddle challenged strongly from its final fence. The trio broke away from the other four runners up the straight – and Dibble Decker held on by half-a-length for Stan Sheppard. It was the jockey’s 85th success for in-form Lacey, operating at a 38 per cent strike…