In Las Vegas fashion, ties among caucusgoers are settled by pulling from a deck of cards. The higher number wins, and card ties are broken by suit.
In Precinct 10, Clinton drew an ace while Sanders drew a six, according to a tweet from a Wall Street Journal reporter. That, the paper reported, gave Clinton three delegates to Sanders's two from that precinct. 
The tie-breaking procedure was used at least twice in 2008, the first year the state Democratic Party switched to the caucus process. 
The rules are similar to the controversial coin flips that decided several precincts in Iowa.