The Ponziani Opening.
(!wi]
1 P-K4
P-K4 [!c was []1 []P-K4 [] ...]
2 Kt-KB3
Kt-QB3 [!c was []2 []X-KB3 []P-K4]
3 P-QB3 [!c P-B3 []3 []X-QB3]
[!!wi]
Black will do best to attempt neither gain of a Pawn nor to sacrifice a Pawn, but rather to strive for continued development.
3 ... Kt-B3
4 P-Q4
KtxKP
Now 5 ..., [!)P-Q4 is possible; hence White is forced to attempt a countermove.
5 P-Q5
Kt-Kt1
The Knight must not go to K2 where it would block Bishop and Queen.
6 KtxP ...
Or else 6 B-Q3
Kt-B4.
6 ... B-B4
7 Kt-Q3
B-Kt3
8 B-K2
O-O
9 O-O
P-Q3
10 Kt-Q2
KtxKt
The Knight is captured, because it threatens to exchange the valuable KB via QB4.
Black will now complete his development by X-Q2, R-K1, X-B1.
Black is by no means restricted to the above line of play. He may, for instance, very well play
4 ... PxP
5 P-K5 ...
Or 5 PxP
P-Q4, whereupon Black is secure.
5 ... Kt-Q4
5 ... Kt-K5 would be speculative, not to say hazardous.
6 Q-K2
P-B4;
7 PxP in passing, P-Q4. Still, White's task is by no means simple. For instance,
8 KKt-Q2
QxP;
9 P-B3
P-Q6;
10 Q-K3
Q-Kt4 and White has had his trouble for next to nothing.
6 PxP
B-Kt5ch.
7 QKt-Q2
P-Q3
or
6 ... P-Q3
7 Kt-B3
B-K3
8 B-QKt5
B-K2
9 PxP
PxP
All in all, the difficulties that Black encounters in this Opening are not considerable.