These are the official ACO Cornhole scoring rules. In other words, how to keep score in a cornhole game.

Cornhole Scoring

7.1 Cornhole "Traditional 21" Scoring – This is a negation or cancellation format where opposing players' frame points cancel one another out. Only those points that do not cancel out apply to the total overall score. Example: Red team scores 7 points in a frame and Blue team scores 9 points in the same frame. The difference is 2 (9-7=2). Blue team scores 2 points in that frame.

7.2 Cornhole "Frame Game" Scoring – Unlike the negation process, Frame Game players are trying to accumulate as many points as possible over 13 complete frames. The perfect score, or maximum amount of points available, is 156 points, meaning a player would need to throw 52 of 52 cornholes. The player with the highest cumulative score at the end of 13 frames is declared the winner. All Woodys and Cornholes for each player are counted toward their score for the frame.

7.3 Cornhole "TRADITIONAL 21" LEAGUE FORMAT (Recommended. Applies to Doubles and Singles)

•Play one match per team or player in an outing
•1 match = 3 games
•Games are scored with Traditional 21 scoring (negation scoring)
•Winner of best of three games wins the match
•1 league point is given for:
◦Each game won within a match
◦Winning a match

Do you have to win by 2? Or is it first one to 21?