I recived some great help earlier today but it was more difficult when I should implement it in my query than I thought. My real query includes several left joins.
I wa
First
SELECT MIN(timer.t3m) AS MinT3M, MAX(timer.t3m) AS MaxT3M,
MIN(timer.t1g) AS MinT1G, MAX(timer.t1g) AS MaxT1G
FROM round INNER JOIN timer ON round.id = timer.round_id
WHERE round.round_date = '2013-03-22'
AND round.gameform = 'V65'
AND round.gameform_info = 'V65-1'
AND round.gameform not like "OSPEC";
Then you can use the calculation which Richard proposed while I was typing this.
See the SQL Fiddle here which uses your data.