The Hedgehog - Sergey KasparovThe Hedgehog by Sergey Kasparov An understanding of Hedgehog structures is an essential component in any chessplayers knowledge. These structures arise when the black c pawn is exchanged early on for the white d pawn (as in the Sicilian Defence). White then adopts a formation with pawns on c4 and e4 and Black curls up in a Hedgehog formation with pawns on a6, b6, d6 and e6. These structures are important as they can arise from an extraordinary variety