Overtrump is a thoroughbred horse born in Australia in 1998. Race horse Overtrump is by Ark Regal (NZ) out of Coolalure (AUS) , trained by John Hogan. Overtrump form is available here. Owned by MRS P D BAKER, MS B J ROSS, DR F A TOMLINSON, MRS G M & A N SHERLOCK, K S C RACING SYNDICATE & MS C M V ROFF..