---------------------------------------
8 | #R |    | #B | #Q | #K |    |    | #R |
|---------------------------------------|
7 | #P | #P |    | #Kt|    |    | #P | #P |
|---------------------------------------|
6 |    |    | #Kt|    | #P |    |    |    |
|---------------------------------------|
5 |    |    | #B | #P | ^P | #P |    |    |
|---------------------------------------|
4 |    |    |    |    |    | ^P |    |    |
|---------------------------------------|
3 |    |    | ^Kt| ^B |    | ^Kt|    |    |
|---------------------------------------|
2 | ^P | ^P | ^P |    |    |    | ^P | ^P |
|---------------------------------------|
1 | ^R |    | ^B | ^Q | ^K |    |    | ^R |
---------------------------------------
A    B    C    D    E    F    G    H

Diag. 33

The position in the diagram seems favourable to Black as White cannot castle for some time.

For that reason another line of play has come to the fore in which White exchanges his inactive QB for Black’s troublesome KB.

3.  Kt-QB3 Kt-KB3 4.  B-Kt5 B-K2 5.  P-K5 KKt-Q2 6.  BxB QxB

---------------------------------------
8 | #R | #Kt|#B  |    | #K |    |    | #R |
|---------------------------------------|
7 | #P | #P | #P | #Kt| #Q | #P | #P | #P |
|---------------------------------------|
6 |    |    |    |    | #P |    |    |    |
|---------------------------------------|
5 |    |    |    | #P | ^P |    |    |    |
|---------------------------------------|
4 |    |    |    | ^P |    |    |    |    |
|---------------------------------------|
3 |    |    | ^Kt|    |    |    |    |    |
|---------------------------------------|
2 | ^P | ^P | ^P |    |    | ^P | ^P | ^P |
|---------------------------------------|
1 | ^R |    |    | ^Q | ^K | ^B | ^Kt| ^R |
---------------------------------------
A    B    C    D    E    F    G    H

Diag. 34

White has now the choice of two lines of development.  He can either prepare for P-QB3 to support his QP. or he can develop his King’s side, holding the P at K5 only

I

7.  Kt-Kt5         Kt-Kt3
8.  P-QB3          P-QR3
9.  Kt-QR3         P-QB4
10.  P-KB4          Kt-B3
11.  Kt-B2          Castles
12.  Kt-B3          B-Q2
13.  B-Q3           P-B4

The sacrifice BxPch, as mentioned above, was threatened.

14.  Castles       Kt-R5
15.  R-Kt1         P-QKt4

If White does not wish to lose so many moves with his Kt, he can effect the intended protection of his QP as follows: 

7.  Q-Q2 P-QR3

not P-QB4 at once, because of Kt-Kt5.

8.  Kt-Q1 P-QB4
9.  P-QB3

II

7.  P-B4          Castles
8.  Kt-B3         P-QB4
9.  B-Q3          P-B4
10.  Castles       Kt-QB3

and so on.

In both cases White has an easy development, whilst Black has no convenient square for his Queen’s Bishop.