De Saint Amant,Pierre Charles Four – Morphy,Paul
In general it has been advised not to move your king side pawns, or more precisely the pawns on the side where you intend to castle. In this game Morphy’s opponent did this and paid the penalty.
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb4+ 7.Bd2 Bxd2+
Q – Is it advisable to take on e4?
A – 7…Nxe4 8.Bxb4 Nxb4 9.Bxf7+ Kxf7 10.Qb3+ d5 11.Qxb4 and Black is fine here. Remember that it is more often worth to take risk to capture a center pawn than a wing pawn.
Update your pattern bank: This is a typical way to attack the opponent’s mobile pawn center.
9.e5 is met by 9…dxc4 10.exf6 Qxf6.
9…Nxd5 10.0–0 0–0 11.h3
With this move the king side becomes slightly weakened, but in the hand of Morphy this is enough to win.
11…Nf4 Transferring pieces towards his opponent’s weakness.
Sacrificing a pawn for nothing. Instead it was worth considering 12.Ne4 Be6 13.Bxe6 fxe6.
12…Nxd4 13.Nxd4 Qxd4 14.Qc2 Qd6 15.Kh1??
15.Ne4 Qe5 16.Ng3 was better.
Bxh3 is now threatened.
More support for h3.
Q – Can you find better continuation than Morphy?
A – 16…Rd8 is better version of Black’s attack than the text move, with the same idea that was executed in the game.
17.Kh2 Rad8 18.Rad1
How could you win at least a Queen?
The final blow. Attack on the side where you are better placed than your enemy.
19.gxh3 Rd3!! 20.Qxd3 Nxd3 21.Bxd3 Qd6+ 22.f4 Qxd3
These were the consequences of 11 h3, a typical weakness on the king side.