If Black takes your d-pawn in the Scotch Game, your knight can take it back. Your queen can also reach that square, but 4. Qxd4? allows 4...Nxd4, and Black captures your queen. The difference is visible before you move: Black's knight already sits on c6, attacking d4.

That is a useful first lesson in this opening. You can challenge the center early, then choose a recapture by checking the pieces around the destination square. For a broader starting point, see the beginner opening guide.

Keep these two decisions together: play d4 to challenge Black's e5-pawn, then, after ...exd4, recapture with the knight from f3. Check Black's possible captures before moving your queen.

Start with the central pawn exchange

The Scotch Game begins with these moves, as listed in the Lichess opening database:

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 *

White's third move sends the d-pawn two squares forward. From d4, it attacks Black's pawn on e5. Black's reply ...exd4 captures that pawn: the black pawn moves diagonally from e5 to d4.

Pause here. Your d-pawn has gone, and Black's former e-pawn now occupies d4. White can restore the pawn balance with 4. Nxd4. In this notation, N means knight and x means capture. The knight travels from f3 to d4 and takes the pawn.

The exchange has removed one central pawn from each side. Your remaining e-pawn still stands on e4, while your knight occupies d4. You have a concrete position to develop from, without needing to memorize a long variation.

Why the knight recapture works

After 4. Nxd4, Black's knight on c6 attacks your knight on d4. An attacked piece is not automatically a lost piece. Your queen on d1 protects d4 along the now-open d-file.

If Black chooses 4...Nxd4, White can answer 5. Qxd4. Both sides have exchanged a knight. Your queen can now take on d4 without being captured by the c6-knight, because that knight has left the board.

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nxd4 5. Qxd4 *

This line illustrates protection and exchange; Black does not have to trade knights. Another legal continuation is 4...Nf6 5. Nc3. Black develops a knight and attacks e4; White develops the b1-knight to c3, where it protects that pawn. Read each new move before continuing your plan.

What goes wrong with 4. Qxd4?

Return to the position immediately after 3...exd4. Now try taking the pawn with the queen first:

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Qxd4 Nxd4 5. Nxd4 *

Black's knight jumps from c6 to d4 and captures the queen. White's f3-knight can take that knight afterward, but White has exchanged a queen for a knight. Winning back the capturing piece does not repair that loss.

The FIDE Laws of Chess, article 3.6, define the knight's move. Here, c6 to d4 is one file across and two ranks down. Look for that jump before choosing your recapture. The warning is specific to this board: moving a queen early can have different consequences in other openings.

Practice the recapture decision

Try the Scotch Game lesson. Play d4, examine ...exd4, and choose the knight recapture. Then explain what Black could capture if the queen took first.

In your next computer game, use the same check whenever a pawn exchange opens a file: which piece should recapture, and what attacks its destination? If you lose material, review the game from the position before the recapture and identify the capture you missed.