The state commission that regulates slap fighting — in which opponents take turns striking each other in the face — attempted Wednesday to address a critical question for the budding sport: What constitutes a legal slap?

Competitors in the Power Slap League must deliver only open-handed blows and must not hit opponents below the chin, according to amended rules approved by the Nevada Athletic Commission that seek to make the matches safer.

The commission originally voted in October to sanction slap fighting, asserting it wanted to prevent unregulated matches and ensure competitors are safe. However, commissioners were concerned the rules weren’t specific enough.

In November, the commission also approved UFC President Dana White’s license to promote the Power Slap League. White and other UFC officers are involved in the league, but the UFC does not operate it.

Power Slap is being featured in the TBS show “Power Slap: Road to the Title.” The first four episodes averaged 275,000 viewers.

However, many competitors exhibited apparent concussion-like symptoms, raising safety concerns about the competition.

Power Slap President Frank Lamicella told the commission Wednesday there have been “no major injuries” among the 25 matches the commission approved.

Any slap that doesn’t meet the criteria will result in disqualification, and every strike is subject to video review. The review official has the final say over whether someone is disqualified.

Marnell was especially concerned about replay guidelines being followed.