West Potomac used its high-powered offense as an effective defense last night, shutting down Yorktown in the fourth quarter as it charged to a 103-79 victory in a boys nondistrict game at Yorktown.

Ninth-ranked West Potomac, which leads the Northern Region in scoring with 83 points per game, topped the 100 mark for the third time as it improved to 12-1. The Wolverines are 2-1 in the Gunston District and trail Mount Vernon by a half-game. The Patriots, who lead the Potomac District with a 3-1 record, dropped to 7-4.

Yorktown hit an impressive nine of 14 shots from the field in the third period and pulled to within 78-71 as Mike Beville scored on a layup as the quarter ended.

But West Potomac held the Patriots (two of 10) to just eight points in the fourth period as it opened the quarter with its potent one-two punch: Avis Willis (game-high 25 points) bombing from the outside and Leon Blakeney (22 points) pounding away inside.

Blakeney scored the first seven points and Willis hit two jumpers, including a three-pointer, as the Wolverines ran off a 14-2 surge to take a 92-72 lead before the Patriots finally called time with 4:56 left.

"We ran our basic offense, with me roaming the paint alone," Blakeney said. "As well as we were shooting outside, that made it even more open in the middle."

Added Coach Bill Engels: "It's a good situation if we're patient and work the ball inside to Leon. We have three or four players who can shoot from the outside."

The Patriots surprised West Potomac in the first half, mounting a respectable running game and beating the Wolverines' full-court trap. Sean Goodwin paced Yorktown with 18 of his team-high 21 points.

"I thought we were a little sluggish with our press," Engels said. "The first phase was good, but they overloaded the weak side and we didn't do a good job in the rotation."

With 2:31 left in the second quarter and the score tied at 42, Willis and Blakeney combined for 10 points as West Potomac went on a 14-7 run to take a 57-49 lead at halftime.

"I thought they would try and slow it down, but we gave up too many points in the first half," Blakeney said. "We play defense when we have to, but we'd rather get out and push the ball." WP (12-1) -- Freeman 2, Richardson 13, Pierce 8, Hummel 2, Chesson 8, Browne 2, Willis 25, Harris 15, Blakeney 22, Adams 4, Keaney 2. Totals 41 13 103. Y (7-4) -- Beville 10, Goodwin 21, Tuba 13, McKnight 19, Mullen 8, McGovern 1, Lorrigan 1, Langan 2, Romer 4. Totals 30 18 79.

Halftime: West Potomac, 57-49.

Three-point goals: West Potomac 4 (Avis 3, Harris); Yorktown 1 (Tuba).