The 2019 Cheltenham Gold Cup looks set to be one of the most fascinating races of the jumps season. Last year's winner Native River is up against 15 rivals including the form horse Clan Des Obeaux, Ireland's leading challenger Presenting Percy, a battalion from the Willie Mullins stable and Betfair Chase winner Bristol De Mai, to name just a few. With tactics central to success, Stuart Riley analyses the possible strategies of the key protagonists.