San Antonio holds of Alder in Dee Stakes battle of the O'Briens

It was the 10th time Aidan O'Brien trained the winner of the race

NOT FOR PASSING: San Antonio and Ryan Moore (orange and blue cap) win the Boodles Dee Stakes at Chester on Thursday. Picture: Healy Racing

Father beat son in the Boodles Dee Stakes as Aidan O'Brien's San Antonio repelled the Donnacha O'Brien-trained Alder at Chester.

Alder was the 11-10 favourite for the Listed contest following an impressive start to his season at Cork, with San Antonio sent off at 16-5 following victory on the all-weather at Dundalk.