Following are again a few examples which show the application of
the principles:

I. (1) P-d4 P-c5
(2) P-e3

With Pxc5 White would give away his center-Pawn, and Black would
regain the Gambit-Pawn easily after (2) ..., P-e6. White could
play (2) P-d5, thereby depriving Black's Queen's Knight of his
best developing square. But in doing so he would lose time with a
Pawn move which does not improve the mobility of his own pieces,
and consequently (2) P-e3 is preferable.

II. (1) P-d4 Kt-f6
(2) Kt-f3

The advance P-c4, which, as explained, is customary in Queen's
Pawn openings, serves its original purpose only if Black has a
Pawn on d5 so that White can open the c-file. Therefore, it is
better for White to wait until Black shows what intentions he has
with his Queen's Pawn.

(2) ... P-d6
(3) Kt-c3

Black's last move clearly indicates that he intends playing P-e5
and not P-d5, and so White has no reason to expect that he will
be able to open the c-file for his Rooks. Consequently there is
no objection to his developing the Queen's Knight to c3, blocking