During last weekend’s Capcom-sponsored Street Fighter IV Pro Tour event in California, organizers accidentally used the wrong version of the game–only discovering the mistake after some players finished their matches. Ouch. The Daily Dot has the story.

“At this weekend’s NorCal Regionals, competing players Ricky Ortiz and Darryl ‘Snake Eyez’ Lewis noticed some odd discrepancies while playing their tournament match, things that were no longer present in the current version of Ultra Street Fighter IV.”

“Embarrassingly, tournament organizers discovered that a prior version of the game was booted up, and four matches between the top 16 finishing players had already been played.”

At this point, Capcom staffers stepped and the decision was made to nullify the results of those matches, asking participants to replay them. They did, and only one of the four matches saw a different result the second time around, The Daily Dot reports. “Du ‘Nuckledu’ Dang managed to sweep Ryota ‘Kazunoko’ Inoue after losing to him in their original match by a margin of two games to one. It was hardly a fair result for Inoue, but there was little recourse at the time,” the site explains.

Event organizer John Choi published a lengthy explanation on Twitter, starting off by saying he personally checked to ensure that all copies of Ultra Street Fighter IV were updated to version 1.04. The digital version of the game was up-to-date, but the Xbox it was played on also had an Ultra Street Fighter IV disc in it. When a disc is inserted, the system defaults to that version, which was, regrettably, the original 1.00 edition.

“Unfortunately, this was not noticed by our team nor the players that played the four matches on it,” Choi said. “Soon as this was discovered, a discussion took place with a Capcom representative since this game is sanctioned by the rules of the Capcom Pro Tour. The rep made a decision that those four matches cannot count and must be replayed on the proper version being used throughout the entire tour. It was a difficult decision by the Capcom team, but I agree with it completely.”

“I am truly sorry for this mistake as it has impacted the integrity of [Norcal Regionals] and the tour,” Choi added. “The mental and emotional pressure of having to replay the matches again was completely unfair to them.”

Finally, Choi made a specific pledge to the one player most seriously affected by the controversy, Inoue. He said he will personally pay to send him to another Street Fighter competitive event. “I know this does not rectify the mistake, but it would give him the opportunity he deserves at another premier event.”

You can read the full story over at The Daily Dot.