4...Bc5 5.Ng5 is variation 2 of 6 in the Scotch Gambit course, a intermediate opening course for White (ECO C44). It runs 20 moves and begins 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bc5 …. White hits f7 at once with the knight and the bishop. Black guards it with the knight on h6. A series of trades on f7 follows. Then a queen check wins back the piece, and Black's king can no longer castle. In the lesson every move is explained on a board and then drilled; it is free.
Move by move
1. e4 – White takes the centre.
1... e5 – Black claims an equal share.
2. Nf3 – White develops and attacks e5.
2... Nc6 – Black defends e5.
3. d4 – White opens the centre.
3... exd4 – Black takes.
4. Bc4 – The Scotch Gambit. The bishop aims at f7.
4... Bc5 – The bishop guards the d4 pawn.
5. Ng5 – White attacks f7 with the knight and the bishop.
5... Nh6 – The best defence. The knight guards f7.
6. Nxf7 – White takes on f7 and starts a series of trades.
6... Nxf7 – Black takes the knight.
7. Bxf7+ – The bishop takes with check.
7... Kxf7 – The king takes back and now stands in the open.
8. Qh5+ – The queen checks the king and also attacks the c5 bishop.
8... g6 – Black blocks the check.
The lesson goes on for 4 more moves, each with its explanation.
chessGM