Wise Men Say had control from that point and stayed on strongly to score by three lengths from Chocolate Fish, also on a path toward the Grand National, and the defending champion Amanood Lad was eight lengths back in third.
Meanwhile, Zedeedudadeeko's return to form at Trentham may force part-owner and trainer Jamie Phillips to change tack.
The nine-year-old bounced back to his best yesterday with an upset victory in the Anuka Smoker Wellington Hurdle (3400m).
"I was thinking it was time to say that's enough and he can go steeplechasing, but I have to think about that again now," Phillips said.
Zedeedudadeeko was back in the early running before rider Charlie Studd made a move with a lap to go.
They improved to sit outside the leader The Shackler before hitting the front three  from home and then safely jumped the final two fences.
 
Manawatu Steeplechase (4200m) winner Game Percy fought on gallantly for second with Kipkeino third.
- NZ Racing Desk