use, while Black, in retreating with his Knight to e7, gains a
move towards the efficient use of the Knight on the King's wing.

All the same, the advance of the Queen's Knight in the center is
one of the most important maneuvers in King's Pawn openings when
it is properly prepared, and its consequences need thorough
discussion.

The proper preparation consists in first fixing the object at
which the Knight aims. This--from White's, the attacker's point
of view--is the Knight f6. The developing move B-g5 serves this
purpose in the most natural way, and a position arises similar to
the one shown in Diagram 43 where Black prevented any further
accumulation of white forces on f6 by B-e6. In the present case
this move is of doubtful value as White, by P-d4, can force Black
to give up his center-Pawn.

+---------------------------------------+
8 | #R | | #B | #Q | | #R | #K | |
|---------------------------------------|
7 | #P | #P | #P | | | #P | #P | #P |
|---------------------------------------|
6 | | | #Kt| #P | | #Kt| | |
|---------------------------------------|
5 | | ^B | | | #P | | | |
|---------------------------------------|
4 | | #B | | | ^P | | | |
|---------------------------------------|
3 | | | ^Kt| ^P | | ^Kt| | |
|---------------------------------------|