A regulation map starts with a pistol round and has another when teams switch sides for the second half. A team can win the opening pistol and lose the second one. Check the map number and half on the selection.
The map winner finished three rounds ahead, enough to cover -2.5. Those same 23 rounds fall short of over 23.5 rounds.
In a best of three the team still needs a second map. It can take the opening map and lose the series 1-2.
More sports: Counter-Strike, League of Legends.