The King's Bishop's Gambit.
1 P-K4
P-K4
2 P-KB4
PxP
3 B-B4 ...
meeting the threat of the Check by evacuating a square for the King.
3 ... Q-R5ch.
4 K-B1
P-Q4
Necessary to support the attack. Unless aid comes immediately forward, the Queen is soon repulsed, for instance, 4 ... P-KKt4;
5 Kt-QB3
B-Kt2;
6 P-Q4
Kt-K2; (or 6 ... P-Q3;
7 P-K5
PxP;
8 Kt-Q5 ]
7 P-KKt3.
This is an analysis made about sixty years ago.
7 ... PxP;
8 K-Kt2
Q-R3;
9 PxP
Q-KKt3;
10 Kt-B3
P-KR3. Matters for Black grow now rapidly from bad to worse.
11 Kt-Q5
KtxKt;
12 PxKt
O-O;
13 P-Q6
QxQP;
14 BxP
PxB;
15 Q-Q3
R-K1;
16 Q-R7ch.
K-B1;
17 BxP with a slashing attack.
5 BxP ...
White will try to keep the diagonal of the Bishop open. True, also 5 PxP has certain advantages, for instance, the opening of a file for the Rook and restriction of the Black QX, but they are of minor importance.
5 ... P-KKt4
Now the advance 6 P-KKt3 is answered by
6 ... B-R6ch.
6 Kt-QB3
B-Kt2
7 P-Q4
Kt-K2
8 Kt-B3
Q-R4
9 P-KR4
P-KR3
10 Q-Q3 ...
in order to liberate the KX.
10 ... P-QB3
11 B-Kt3
B-Kt5
12 P-K5
Kt-B4
13 Kt-K4
Kt-Q2
The game is complicated, but Black keeps at it. He menaces Castling Queen's side.
14 K-Kt1
BxKt
15 PxB
O-O-O
In order to reply to 16 PxP
Q-Kt3;
17 QBxP with
17 ... KtxKP. And the answer to 16 Kt-Q6ch.
KtxKt;
17 PxKt would be
17 ... Q-Kt3;
18 QxQ
BxPch. White has over-rushed matters.
However, Black has no need, should he fear those complications, to assume the aggressive, but may safely play for development.
3 ... Kt-QB3
4 Kt-KB3
Kt-B3
5 Kt-B3
B-Kt5
6 P-K5
Kt-Kt5
7 Kt-Q5
O-O
threatening 8 ..., [!)KXxKP.
8 KtxB
KtxKt
9 P-Q4
P-Q4
10 B-Kt3
P-KB3
Should White forego the early advance of the KP, Black will easily get an even position.
6 O-O
O-O
7 P-Q3
BxKt
8 PxB
P-Q4
9 PxP
KtxP
10 BxKt
QxB
11 BxP
Q-B4ch.
12 K-R1
QxP
13 BxP
B-Kt5
These are some of the principal variations of the accepted King's Gambit. But Black may safely decline it though possibly a minute advantage will then accrue to White.