CHEVY CHASE - Rick Schuller, relegated to a playoff after missing a short birdie putt in the 20th annual Callaway Middle Atlantic PGA Head Pro championship, finally made up for it yesterday, but it took him six extra holes to break away from the superb putting of Steve Madsen at Chevy Chase Club.

At the end of the 27 holes (par 70, 6,800 yards, plus a repeat of the front nine), Schuller, Madsen and Charlie Briggs were tied at 1-over-par 106 in the 79-man field.

Briggs, from Burning Tree Club, went out with a bogey at the second extra hole. Madsen converted a succession of putts - including a 20-footer at the fifth for par - to stay alive. Playing 1 and 18 in rotation, Madsen, from Lakewood Country Club, and a winner of this event in 1996, hit his approach to 12 feet at the 420-yard finishing hole, and the longer-hitting Schuller, newly installed at the Country Club of Petersburg and in the event for the first time, ended up 8 feet short of the cup.

Madsen's sidehill breaker slid past the hole, and Schuller ended it with his birdie.

In the 11-man senior division, Bob Bilbo, from Mid-Atlantic Golf Club at Norbeck, posted 37-33-36-106, beating Ronnie Kelley and Steve Lambert by two strokes over 6,223 yards.

The leaders: Rick Schuller 36-34-36-106; Steve Madsen 36-34-36-106; Charlie Briggs 33-36-37-106 (Schuller won playoff on sixth extra hole); Joe Franz 37-34-36-107; Mike Gebhard 36-35-36-107; Greg Scott 37-36-35-108; Chip Sullivan 38-36-34-108; Frank Ferguson 39-34-36-109; Jim Devine 39-36-35-110.

Other selected scorers: Jack Skilling 36-37-38-111; Don Slebodnik 40-35-37-112; Steve Cramer 36-37-39-112; Brian Meyer 39-38-36-113; Jim Fitzgerald 41-33-39-113.

Seniors: Bob Bilbo 37-33-36-106; Ronnie Kelley 36-37-35-108; Steve Lambert 38-36-34-108; Barry Fuhrman 38-36-36-110.