Classical: 5.Be3 Qf6 6.c3 is variation 2 of 5 in the Scotch Game course, a intermediate opening course for White (ECO C45). It runs 17 moves and begins 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 …. White defends d4 with Be3 and c3. Black puts pressure on d4 with ...Qf6 and ...Nge7; White completes development and is ready for Nb5 or f4 ideas. In the lesson every move is explained on a board and then drilled; it is free.
Move by move
1. e4 – Takes the centre.
1... e5 – Black claims an equal share.
2. Nf3 – Develops and attacks e5.
2... Nc6 – Defends e5.
3. d4 – Opens the centre at once.
3... exd4 – Black takes.
4. Nxd4 – Recaptures with the knight.
4... Bc5 – Attacks the d4 knight.
5. Be3 – Defends the knight with a piece and offers a bishop trade.
5... Qf6 – Adds a third attacker to d4.
6. c3 – Supports the d4 knight with a pawn, so ...Nxd4 can be met by cxd4.
6... Nge7 – Develops; the knight can go to g6 or e5 and keeps f6 for the queen.
7. Bc4 – Develops actively, aiming at f7.
7... O-O – Black castles.
8. O-O – White castles too.
8... Bb6 – Black removes the bishop from any tricks with Nb5 or b4.
The lesson goes on for 1 more moves, each with its explanation.