user: Question: When Chris Barnes is on team usa how many europe teams are there?
Columns: ['Match no.', 'Match Type', 'Team Europe', 'Score', 'Team USA', 'Progressive Total']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [13.0, 'Singles', 'Mika Koivuniemi', '279 - 207', 'Bill Hoffman', '6 - 7']
SQL:

assistant: SELECT COUNT("Team Europe") FROM "Table" WHERE "Team USA" = 'Chris Barnes';