Defending champion Cindy Davis of Mitchellville and Prince Georges Country Club relied on deft sand shots to defeat Kim Williams of Bethesda, 2 and 1, in the semifinals of the Maryland Women's Amateur golf tournament today at Hillendale.

Davis, 21-year-old Furman all-America, will play Deirdre Anderson, a Wake Forest player out of Baltimore's Worthington Valley, in Friday's scheduled 18-hole final.

Anderson sank a 20-foot par putt on the first extra hole to edge 16-year old Clare Dolan of Montgomery Village and Seneca Valley High School, 1 up. Dolan was four holes down with four remaining, but rallied and sent the match into an extra hole by sinking an eight-foot par putt at the 18th hole.

Davis cruised to a morning 6-and-4 victory over Kenwood's Liza Abood, but struggled in the afternoon against Williams, whom she beat in June in the Women's District Golf Association final.

Davis clung to a one-hole lead by getting down in two shots from greenside bunkers to halve both the ninth and 10th holes. She went 2 up at the par-3 11th, although she three-putted, and then went 3 up at the 13th, where once again she parred from the sand.

"My trap play kept me in the match," Davis said. "This golf course is tough and I think I got tired."

Davis brought the match to a close by matching Williams' par at the 17th hole.

Dolan said she thought she was out of the match against Anderson, but refused to fold. Her approach shot on the par-4 16th hole almost went in the cup. She tapped in a six-inch putt for birdie. Dolan scrambled for winning pars at 17 and 18, but the match ended when she missed a 10-foot par putt bid on the first extra hole.

In her morning quarterfinal, Dolan beat Jane Abood of Kenwood, 5 and 4. In other quarterfinals, Williams ousted Lois Ledbetter of Lakewood, 5 and 4, and Anderson beat Pat Thompson of Cumberland, 2 and 1.