The Kolisch Defense emerges from the King's Gambit after 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Nxe5 d6. In this sharp and aggressive line, Black aims to undermine White's pawn structure and capitalize on the potential weaknesses created by the pawn advances. Key ideas for Black include countering White's center and preparing to develop pieces rapidly while keeping the tension in the position, particularly around the f4 pawn. This opening appeals to players who enjoy tactical battles and are willing to embrace complex, unbalanced positions where both sides have chances for dynamic play.