ROBINSON PLEADS GUILTY: Trail Blazers rookie Cliff Robinson pleaded guilty yesterday to punching a policewoman outside a Portland bar. Robinson, 23, was sentenced to a year of probation and fined $250 for fourth-degree assault, a misdemeanor.

Multnomah (Ore.) County District Judge Nely Johnson also ordered him to perform 50 hours of community service and to undergo counseling for anger management. A disorderly conduct charge against him was dropped.

Robinson, a second-round draft choice from Connecticut, was arrested about 3:30 a.m. April 29 after striking the officer during a fight. Police said Robinson struck officer Elaine Slone as she and her partner tried to break up the fight outside Goldie's Restaurant and Lounge.

"I'm sorry for this unfortunate incident and I want to apologize to the Portland police department, the Portland fans and Elaine Slone," Robinson said in court. "I never intended for anyone to get hurt."

SONICS' OWNER BACKPEDALS: A major stumbling block to construction of a new arena for the Seattle SuperSonics was removed when team owner Barry Ackerley said he would no longer demand that thousands of seats be removed from Seattle Center Coliseum.

Ackerley wanted the number of Coliseum seats reduced from 14,500 to 5,000, so the Coliseum and Ackerley's new arena wouldn't compete for the same events.

BARKLEY ACHING: Surgeon James Andrews will examine 76ers forward Charles Barkley's aching right shoulder Thursday to determine whether Barkley needs arthroscopic surgery to shave away bone spurs, as prescribed by team physician Jack McPhilemy.