it with Kt-QB3, as White would exchange pawns and then Queens.
Black would thus forfeit his chance of castling and lose much
time in bringing the King into safety and the Rooks into play. P-
KB3, of course, is impossible, as it is not a developing move,
and moreover blocks the natural development of the King's Knight.
Protecting the pawn with the Queen would also block other pieces,
and QKt-Q2 cannot be good, as it blocks the Queen's Bishop.

Since it seems impossible to protect the King's Pawn, the only
alternative would be to exchange it; indeed it is on the whole
the best course, although it allows a White piece to take up a
dominating position in the centre. Wishing to avoid this, Black
plays

3. ... B-Kt5

and, by pinning the opponent's Knight, indirectly protects the
King's Pawn. This manoeuvre is, however, ill-advised, as Black is
forced to exchange the Bishop for the Knight. The Bishop will
have moved twice, the Knight only once, therefore White will have
gained a move for his development.

4. PxP BxKt

Should Black play PxP at once, White would exchange Queens,
release the pin, and win the pawn.

5. QxB PxP
6. B-QB4