(4) ... Kt-f6
(5) Kt-c3 B-e7
(6) B-d2 P-d5

Threatening to win a piece by P-d4.

(7) Pxd5 Ktxd5

Now White has no center-Pawn either; Black has
a perfectly good game.

II. (3) Kt-f3 Kt-c6

Most players would be tempted to play P-c5 instead. But this
must be bad as it is a Pawn move which is not necessary. Black
does not need to defend the Pawn d4 as he is a Pawn ahead; and
the development of the pieces is much more valuable than the
advantage of a Pawn. White would obtain a far superior position
with (4) P-c3, Pxc3; (5) Ktxc3, after which Black cannot
hope ever to free his game by P-d5.

(4) Ktxd4 Kt-f6

It would be bad to exchange Knights on d4 because White's Queen
would be brought up into a dominating position from which she
could not easily be driven away.

(5) Kt-c3 B-b4

This attacks again the Pawn e4. Relieving the pin by (6) B-d2