Amateur Robert Black Jr. of Army Navy shot four-under-par 67 and moved into a four-stroke lead yesterday in the second round of the 54-hole Virginia State Golf Association Open championship at Reston Golf and Country Club with 139.

Tied for second were David Jimenez of Wintergreen, the first-day leader, and Woody FitzHugh, assistant pro at Washington Golf and Country Club, at 143. Jimenez carded 73 and FitzHugh 70.

Jimenez, former tour player, missed a short par putt on the third hole and reached across the hole to tap it in before walking around and stroking it into the hole. Following considerable discussion between the members of his foursome - Dave Howard, George Bullock and Mark Lawrence - and members of the tournament committee, Jimenez was penalized a stroke, giving him 6 on the par-4 hole.

Jimenez missed three putts of less than four feet.

Black, runner-up in the D.C. Golf Association Amateur last week, missed only one green and managed par on it. He eagled the par-5 ninth, after hitting a five-iron within three feet of the cup. He sank a 40-foot birdie putt on the first and 30-foot birdies on the fifth and 13th.

FitzHugh also eagled the ninth, using a five-wood for his second shot. His only birdie came on the fifth.

Amateurs were making a strong showing, filling 15 of the low 28 spots.

Tied for fourth were three amateurs: Pete Van Pelt of Army Navy, Ted Vallow of Reston and Jay Shepherd of Lynchburg, at 144.