4...Nf6 5.e5 Ng4 is variation 4 of 6 in the Scotch Gambit course, a intermediate opening course for White (ECO C44). It runs 18 moves and begins 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 …. Black's knight jumps to g4 and attacks the e5 pawn. White castles and guards e5 with the rook. After the trade on d6 the e7 bishop is pinned, and White wins back the pawn on d4. 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... Nf6 – Black develops and attacks e4.
5. e5 – White pushes and chases the knight.
5... Ng4 – The knight jumps to g4 and attacks the e5 pawn.
6. O-O – White castles. The e5 pawn is safe for now.
6... Be7 – The best answer. Black develops and gets ready to castle.
7. Re1 – The rook guards e5 and takes the e-file.
7... d6 – Black strikes at e5 to free the game.
8. exd6 – White takes and opens the e-file.
8... cxd6 – Black takes back with the pawn. The e7 bishop is pinned, so it cannot take.
The lesson goes on for 2 more moves, each with its explanation.
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