If White, instead of playing (2) P-d4 as assumed in the above
examples, advances his f-Pawn against Black's center, Black has
ample time to make all preparations necessary to maintain his
center-Pawn, for White does not threaten Pxe5 as long as he is
not protected against Q-h4+, followed by Qxe4. Black's best move
is apparently B-c5, so that he may be able to reply P-d6 to (3)
Kt-f3 without blocking the way of the Bishop. On c5 Black's
Bishop is very disagreeable for White as he prevents his
castling. The natural development of this opening would be about
this:

(2) P-f4 B-c5
(3) Kt-f3 P-d6
(4) B-c4 Kt-f6

Although this move blocks the diagonal for Black's Queen, making
impossible a check on h4, it does not enable White to win a Pawn
on e5, because (5) Pxe5, Pxe5; (6) Ktxe5 would be answered by Q-
d4.

(5) P-d3 Kt-c6
(6) Kt-c3 B-g4

Black has one more piece developed than White on account of the
Pawn move P-f4 which is a wasted move from the point of view of
development, especially as White cannot very well castle on the
King's side and make use of the open f-file for his Rooks.

The two principles mentioned--namely the development of the
pieces without unnecessary Pawn moves or other loss of time and