Review gowran park 21st Jan Whinstone Boy gave trainer Jimmy Mangan his biggest moment since winning the 2003 Aintree Grand National with a hard-fought success in the Tendrleen Thyestes Handicap Chase at Gowran Park.Sean Flanagan had the well-backed 5-1 chance up with the pace throughout in the gruelling conditions.The race looked between him and Siegemaster turning for home but the latter lost his chance with a mistake at the last and had to settle for third.Hangover finished strongly to take second, a length and three-quarters behind the winner."It's great to win this race as my father won it 29 years ago with Junes Friend, which I led up. It's a race I've always wanted to win," said the County Cork-based handler."Soft ground is the big key to him. The three lads that own him are from Belfast and were involved with Monty's Pass."The lads love Liverpool and he'll go for the Topham Chase. He'll get an entry for the Grand National but probably won't get in."I told Sean to make plenty of use with him with the light weight. This is my biggest day since Aintree."Flanagan was completing a 32-1 double having partnered Carnbridge (9-2) to a head victory over Take It Easee in the Kilkenny Handicap Hurdle."It looked like he was going to be a good second going to the last but he rallied well," said trainer Dick Donohoe.War Of Attrition (6-1) rolled back the years by taking the Alo Duffin Memorial Galmoy Hurdle.The 2006 Cheltenham Gold Cup hero jumped impeccably throughout for 'Slippers' Madden and kept on to beat Powerstation by four lengths."I haven't had that much pleasure since he won the Gold Cup. He's in the World Hurdle but the Grand National (at Aintree) is the plan and he'll be retired after that," said trainer Mouse Morris.