The Hedgehog is a respected chess formation, usually adopted as Black, where the defender crouches behind a wall of pawns on the third rank, spines abristle, fending off any hostile aggression until the time comes to unfurl and deploy the fretful porpentine’s armoury in earnest. Since the Hedgehog is essentially a defensive ploy, it is hardly seen as White, but in the elite Dortmund tournament last month former world champion Vladimir Kramnik demonstrated that it can also be adapted for a White offensive.