a double move in the game is indicated as two comma-separated (ordered) moves,
as in 3.Na5,Bd3 e6,f4 (the two first are white moves,
the two others are black moves).
a double move in the game is indicated as two comma-separated (ordered) moves,
as in 3.Na5,Bd3 e6,f4 (the two first are white moves,
the two others are black moves).