Charlie Weaver, who has dominated the winner's circle in the hunter divisions at major horse shows all year, continued his string yesterday in the Washington International Horse Show at the Captial Centre, capturing two championships and one reserve title.

In the regular working hunter classes, Weaver 26, of Fairfax won for the third consecutive year on Ruxton, owned by August A. Busch Jr. and Cismont Manor Farm.

Although Ruxton, an 8-year-old bay gelding trained by Kenny Wheeler of Keswick, Va., was shut out of the last class, he won three first-place ribbons this week for 15 points and a commanding lead toward the grand championship award.

The 16.1-hand horse by a Hanoverian stallion out of a thoroughbred mare was purchased by Wheeler as a 3-year-old and then developed into a show hunter. "he jumps clean and correct and smooth," said Wheeler. "He has a lot of stride and the distance [between the jumps] comes easy."

In the regular comformation division, Weaver guided Liz Johnson's Early light to the championship, after winning the stake class, with a total of 14 1/2 points. Weaver also took reserve in the same division with August A. Busch Jr.'s Stocking Stuffer.

In the international jumping class, Dennis Murphy on Gulf States Paper Corp.'s Tuscaloosa, an aged chestnut gelding, won five straight heats.

Two identical courses of five jumps were set up in the ring and the first to cross the finish line was declared the winner in five rounds of competition.

Bernie Traurig came in second on Hunting Valley Farm's Obi-1-kanobi. The win put Murphy in second in the national rider standings with 14 points. Traurig leads with 16 points.