The King's Pawn Game arises after 1.e4 e5, the "Open Game." ECO code: C20.
The oldest and most classical chess opening sequence. Both players occupy the centre with pawns, leading to direct confrontation. White can continue with 2.Nf3 (the most common, leading to Ruy Lopez, Giuoco Piano, Scotch Game, Petrov\'s Defence), 2.f4 (King\'s Gambit), 2.Nc3 (Vienna Game), 2.Bc4 (Bishop\'s Opening), or various other moves.