With 5. O-O, White gambits the knight for a massive lead in development. Most of the time Black takes the Knight and plays 6...Qf6 or 6...Qe7 afterward.

Sometimes White sacrifices his light-squared bishop to draw out the Black king on the heavy f-file, and the play is often White's initiative vs. Black's material lead.

Black can also sacrifice his d-pawn to slow down White with 5...d5 (Brentano defence) and then 6...gxf3.

There is also the Kling and Horwitz counterattck 5...Qe7.

For explanation of theory tables, see theory table and for notation, see algebraic notation..

Wikipedia has related information at King's Gambit

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