Lord Windermere (right) and On His Own battle it out 12 months ago© Photo Healy Racing
All 18 horses have stood their ground following the final declaration stage for Friday's Betfred Cheltenham Gold Cup.
Tony McCoy will ride John Kiely's Hennessy Gold Cup winner Carlingford Lough in what will be his final Gold Cup.
He features in an Irish challenge that also includes last year's winner Lord Windermere trained by Jim Culloty, the Willie Mullins trio of Djakadam On His Own and Boston Bob Noel Meade's Road To Riches and the Henry de Bromhead-trained Home Farm Silviniaco Conti is the ante-post favourite for Paul Nicholls and Noel Fehily as he bids to win the blue riband at the third attempt.
Jonjo O'Neill's dual Festival winner Holywell Oliver Sherwood's Many Clouds and Mark Bradstock's novice Coneygree have chances in an open renewal.
Gordon Elliott has declared Don Cossack but he is expected to line up as favourite for the Ryanair Chase on Thursday.