King's Gambit Accepted, Kieseritzky Gambit

In algebraic notation, e5 identifies column e and row five. The Kieseritzky Gambit begins when White offers the f-pawn to open lines and Black accepts it. Black then supports that pawn with another pawn and advances to g4 to attack White's knight. White answers by placing the knight on e5, a central square from which it joins the attack while avoiding a passive retreat.

White is not trying to regain the pawn immediately. The compensation is activity, meaning pieces enter the game quickly and create threats. The knight on e5 can help pressure f7 near the black king, the bishop commonly develops to c4, and the central pawns can advance to open more lines. Development means moving pieces away from their starting squares to useful, active positions.

Black keeps an extra pawn and gains space, meaning control of more territory, with the pawns on f4 and g4. However, those pawns are far from their starting support and can become targets. Black must finish bringing the pieces into play and secure the king without allowing a forcing series of checks or captures. White also needs accuracy: an aggressive position does not guarantee a winning attack if the remaining pieces join too slowly.