The 1977 Washington International Horse Show at Capital Centre has developed its own matinee idol.

It's Sandsablaze, the U.S. Equestrian Team's infrequently used gelding, that won the Eisenhower Memorial Perpetual Trophy yesterday afternoon, outracing and outjumping 32 top international-open performers in the doubles and trebles class.

The handsome light chestnut, ridden by Buddy Brown, cleared the 11 obstacle jumpoff course in 31.2 seconds, finishing 1.3 seconds ahead of Liz Edgar on Everest Wallaby and 1.9 seconds ahead of Mike Matz on Jet Run.

Tuesday, Sandsablaze won the afternoon features by a 10th of a second man in over Tuscaloosa. The 10-year old jumper is the first horse at the current show to win two international open events.

Sandsablaze was third off in the field of 13 in the jumpoff. Edgar, the British rider who won the Accumulator Class Monday night, urged her German-bred gelding through the course to gain the red ribbon with a time of 32.5. She and Everest Wallaby went seventh and right behind her came Matz and Jet Run to place third.

John Simpson of the Canadian Equestrian Team placed fourth with Texas in 34.2 and teammate Torchy Miller on Eaden Vale was fifth in 35.2. Lutz Merkel rounded out the entries who negotiated the jumpoff course without a fault by placing sixth with Salvaro in 37.5.

Last year's winner, The Cardinal, was ninth in the class with a four fault, 40.4 round. Idle Dice, who came into the show leading the battle for the Grand Prix Horse of the Year award, once again failed to display usual form and failed to gain the Eisenhower jumpoff.

The victory, plus the third place gained by Matz on Jet Run, kept the USET on top in the international standings with Britain second, Canada third and West Germany fourth.