Charlie Blake won a $10,000 prize yesterday for rolling a perfect 300 game in tournament play -- in a Baltimore County courtroom, not at the bowling alley.

The pins flew for him on May 7, 1989, in a perfect game that helped him to a third-place finish in the tournament worth $200. The Amateur Bowlers Tour competition was in Dundalk.

But Charles Hansen Blake, 59, of the 400 block of Anglesea Street in Baltimore, believed that his perfect game during championship play was also to be rewarded by a special $10,000 prize, according to papers filed in a breach-of-contract lawsuit against the Baltimore division of the Amateur Bowlers Tour and two former franchise holders.

They had refused to pay him the $10,000 prize, citing a clause in an insurance agreement that barred the award to anyone with a bowling average above 190.

They said Mr. Blake was told he couldn't win the $10,000 special prize five or six weeks before the tournament, but the advertising and entry form for the competi- tion did not note this exclusion.

Mark and JoAnn Johnson of Reisterstown, former holders of the Baltimore franchise, reached a $3,500 settlement of the lawsuit with Mr. Blake this month, his attorney, L. Michael Schaech, said yesterday.

Because Amateur Bowlers Tour itself did not answer the suit in time, Baltimore County Circuit Judge Robert E. Cahill Sr. also awarded Mr. Blake the $10,000 prize.