Range advantage describes the situation where one player’s range holds superior average equity against the opponent’s range on a given board. This concept is fundamental for determining aggressor role: the player with range advantage has greater incentive to bet more frequently and at larger sizings. Range advantage is not static and shifts with each runout card; a player may hold range advantage on the flop but lose it on certain turns. Quantifying range advantage requires solver analysis, but heuristics like board connectivity, position, and preflop dynamics provide practical estimates.