Chessy
Petrov's Defense: Three Knights Game as White
After 1.e4 e5 2.Nf3 Nf6 3.Nc3, you reach a very solid position where it is Black to move. This is a good training spot because the opening is already rich in choices, but the engine says the position is still level. Your job is not to chase a big attack right away; it is to understand the calm development battle and know what Black usually tries next. The drill below will help you spot the most sensible replies and punish the less accurate ones.
Play the Petrov's Defense: Three Knights Game against the engine
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This line of Petrov's Defense is about piece placement and timing, not early tactics. White has a simple setup, and Black has several natural replies to choose from. The position is practical for club players because both sides can develop normally, but the exact move order still matters. If you keep your pieces active and stay ready for the most common reply, you will handle the opening comfortably.
What the engine likes most
Stockfish rates this +0.16, a small edge for White. That means you are basically equal here. The best move for Black is Nc6, and the suggested continuation is Nc6 Bb5 Bb4 O-O. In other words, Black’s most accurate reaction is also one of the main moves you need to know in the drill.
What the database says people actually play
The position has been reached in 24,675,194 games, so this is not a rare sideline. The most-played continuation is Nc6 with 11,549,043 games, followed by Bc5 with 5,477,472 games, Bb4 with 3,181,182 games, d6 with 2,397,255 games, d5 with 904,315 games, and c6 with 371,595 games. The scores are close enough to show that White is not trying to refute the opening — you are trying to stay accurate and keep the game balanced.
The replies to watch for
A few choices are flagged as inaccuracies here. Bc5 is an inaccuracy and loses about 0.9 pawns, with Nc6 as the better move. d5 is also an inaccuracy and loses about 0.6 pawns, again with Nc6 as the better move. c6 is another inaccuracy and loses about 1.0 pawns, with Nc6 preferred. That makes Nc6 the move to know first, and the drill will train you to recognise the position after it.
Results across 24,675,194 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| Nc6 | 11,549,043 | 50.5% |
| Bc5 | 5,477,472 | 50.1% |
| Bb4 | 3,181,182 | 48.1% |
| d6 | 2,397,255 | 52.0% |
| d5 | 904,315 | 52.0% |
| c6 | 371,595 | 55.2% |
Frequently asked questions
Is the Petrov's Defense: Three Knights Game good for White?
It is completely playable for White. The engine calls the position dead level, and the database scores are very close. That makes it a good opening to learn if you want a calm, sound game without forcing sharp theory.
What is the best move for Black here?
The engine’s best move is Nc6. The suggested continuation is Nc6 Bb5 Bb4 O-O, so that is the main line to understand in the drill. If you know that reply, you are already prepared for the most important branch.
Which replies do people play most often?
Nc6 is by far the most common continuation, and Bc5, Bb4, d6, d5, and c6 also appear often. Among those, Nc6 is the engine’s choice, while Bc5, d5, and c6 are marked as inaccuracies. That makes the opening a great test of whether you can tell the natural move from the best move.
What should White aim for in this opening?
Stay calm and develop sensibly. The position is not about forcing an advantage immediately; it is about keeping the game level and being ready for Black’s most accurate development. The drill helps you recognise the structure and react with confidence.
How many games feature the Petrov's Defense: Three Knights Game?
Over 25 million Lichess games have reached the Petrov's Defense: Three Knights Game position. White wins 50.6%, Black wins 45.2%, with 4.1% draws — based on real rated games.