Berliner played for his countrys Olympiad team at 10th Chess Olympiad, drawing his only game on the second reserve board. Berliner played four times in the US Chess Championship. In 1954 at New York, he scored 6½/13 to tie 8–9th places; Arthur Bisguier won. The last three times Berliner played in the U.S. Championship, Fischer won the tournament. In 1957–58 at New York, Berliner had his best result, 5th place with 7/13. In 1960–61 at New York, he scored 4½/11, tying for 8th–10th place. Finally in 1962–63 at New York, he scored 5/11 for a tied 7th–8th place.
Question: How many games is the difference between Berliner's most and fewest wins?
Answer: 2.5