|One of the rarer and unusual King's Pawn defences adopted by Black
springing from the "Épine Dorsale".
It is hardly ever seen at high level.
Black makes a brazen sacrificial attack with a P-Q4 gambit in move 2wb (left) for a line of doubtful merit, sometimes called the Englund Counter-Attack after Swedish player Fritz Englund (1871-1933), although according to the Oxford Companion to Chess the line is not attributable to him.
Black displaces White's queen and gains a lead in development for the loss of
one or two pawns, but with careful play White should quickly regain equality.
Variations include the Maroczy (or Elephant), a
further Black gambit considered unplayable nowadays.