Heavily favored Sally Voss overwhelmed Amy Geithner, 7 and 6, yesterday and gained the semifinals of the Women's District Golf Association Championships.

Lisa Abood, Pat Thurner and Diane Rankin also advanced at Congressional Country Club.

Voss a senior-to-be at Stanford where she plays No. 1 on the women's golf team, snaked in a 45-foot birdie pett to win the opening hole and birdied two others on the front nine for a 4-up lead over Wake Forest player Geithner of Fairfax. Voss did not let up until winning on the 12th hole.

In this morning's semifinals, Abood of Kenwood tests Rankin of Montgomery Village and Voss goes aginst Congressional clubmate Thurner.

Thurner said, "I've played with her, but never against her. I am looking forward to it, nervously."

Thurner survived one of the day's two pressure matches when she eliminated former WDGA and 17-time Indian Spring women's champ Rita Weitzen on the final green 1 up.

Thurner, reigning two-time Congressional women's titlist, battled Weitzen throughout the back nine.

The turning point was the picturesque, downhill par-4 17th hole. With the match even, Weitzen was in front of the green and Thurner was in a greenside sand trap. Each lay two. Thurner chipped from the sand and the ball struck the flagstick and stopped a foot away for a conceded par. Weitzen fell to 1 down when she took three shots to get into the hole.

Thurner won the match when they halved the par-3 18th in regulation.

In the other dramatic quarterfinal, Rankin held off a valiant bid by WDGA Vice President Ruth Ann Verell of Belle Haven and also won on the final green, 1 up.

Rankin held a two-hole lead heading into the long par-four 16th. Rankin hit the green in two shots, Verell fell short in two. Determined Verell got it "up and down" with a fine chip and testing five-foot putt. Rankin two-putted to remain 2 up.

Verell sank a six-footer to win the 17th and pull within one.

Verell appeared in position to send the match into extra holes when she reached the final par-three green with her tee shot and Rankin fell short. Verell's putter finally betrayed her as she three-putted and Rankin scored a halving bogey.

Abood, University of Maryland women's basketball player and like Voss a long hitter, was 3-up at the turn and won the 15th hole with birdie to turn back Bernice Fedder of Fairfax, 3 and 2.

"I'd like a crack at her," said Abood of Voss. That can occur if both win today.

In the first flight semifinals, Nancy Hollenbeck plays Pam Smyth and Cloey Hardesty faces Shellie Levine.