O`Brien has strong hand at Doncaster Aidan O`Brien, who is still on the crest of a wave after more big-race successes at the weekend, was yesterday responsible for 10 of the 15 confirmations for the Racing Post Trophy at Doncaster on Saturday. His acceptors for the last Group One race of the season in Britain are headed by Castle Gandolfo, owned by Sue Magnier, but other interesting possibles include last week`s Newmarket winner Century City. The other possibles are the supplemented Godolphin runner Mount Joy, Mr Sandancer for James Given, Redback for Richard Hannon, Savannah Bay for Brian Meehan and Tahitian Storm, from the Mark Tompkins stable. The 15 confirmations are: Camp David, Canberra, Castle Gandolfo, Century City, Della Francesca, High Chaparral, High Sierra, Mr Sandancer, Mutinyonthebounty, Redback, Savannah Bay, Tahitian Storm, Temple Of Artemis, Wiseman`s Ferry and Mount Joy. O`Brien has won this race twice before, with Aristotle and Saratoga Springs. The going at Doncaster, where racing is also scheduled for Friday, is soft.