The Falkbeer Counter-Gambit.
Aggressive players love to hoist an opponent with his own petard. They have invented the Counter-Gambits. To refute a proffered sacrifice by declining it and offering one themselves is their pleasure.
1 P-K4
P-K4
2 P-KB4
P-Q4
3 PxQP
P-K5
With 3 ... PxP the game would be balanced, but the advance of the Pawn, though perhaps not entirely sound, is worth some study. The player who chooses this variation evidently considers his KP worth more than the rather misplaced White Pawn on B4.
4 P-Q3
Kt-KB3
5 PxP
KtxKP
6 Kt-KB3
B-QB4
7 Q-K2
B-B4
The idea of White, though tempting, is wrong. He plays for 8 P-KKt4 but cannot do it, since Black Castles and obtains a smashing attack
8 ... O-O;
9 PxB
QxP;
10 B-K3
Kt-QB3;
11 BxB
QxB. The Black Rooks get too active.
8 Kt-B3
Q-K2
Black has a good game.
Much superior to the above line of play is the steady attack on the advanced Pawn.
4 Kt-QB3
Kt-KB3
5 Q-K2
B-Q3
6 P-Q3
O-O
7 PxP
KtxKP
8 KtxKt
R-K1
9 Q-B3
B-KB4
10 B-Q3
BxKt
11 BxB
P-KB4
12 Kt-K2
PxB
Black has some little attack because the QP is exposed and the KP exerts some pressure but White is a Pawn to the good.
It is well to analyze these variations, so as to form position judgment, but the King's Gambit is irretrievably out of fashion.