The Hedgehog is not just an opening, it is a system. A system that can be used against 1 c4, against 1 e4 and also 1 d4. Some players, such as the Swedish Grandmaster Ulf Andersson, appear to play very little else with the black pieces. Black’s pieces curl up behind a row of pawns on the third rank and invite White to attack – at which point they spring out from behind the barricades to give the aggressor a nasty shock. The Hedgehog can easily transform into a tiger... This is modern chess.