Teams - Washington (54-28) vs. Seattle (52-30). Dates - Sunday, May 20, at Washington, 1:30 p.m. (EDT); Thursday, May 24 at Washington, 8:35; Sunday, May 27, at Seattle (Kingdome), 8: Tuesday, May 29, at Seattle (Coliseum), 11:30; Friday, June 1, at Washington, 9; Sunday, June 3, at Seattle (Coliseum), 3:30; Wednesday, June 6, at Washington, 9. PATH TO FINALS - Washington defeated Atlanta in Eastern Conference semifinals, 4-3, and defeated San Antonio in conference finals, 4-3; Seattle defeated Los Angeles in Western Conference semifinals, 4-1, and defeated Phoenix in conference finals, 4-3. PLAYOFF POOL AT STAKE - Winning team will receive $180,000 for championship series; losing team will receive $120,000. PLAYOFF MONEY ALREADY WON - Washington's total is $187,500 ($50,000 for league's best record, $50,000 for East's best record, $37,500 for conference semifinal championship, $50,000 for conference championship); Seattle's total is $137,000 ($50,000 for West's best record, $37,500 for conference semifinal championship, $50,000 for conference championship). CAPTION: Picture 1, Sonics, John Johnson; Picture 2, Lonnie Shelton; Pictue 3, Jack Sikma; Picture 4, Gus Williams; Picture 5, Dennis Johnson; Picture 6, Coach Len Wilkens.