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Petrov's Defense: Modern Attack is a chess opening that arises after 1.e4 e5 2.Nf3 Nf6 3.d4. It is classified C43 in the ECO system, and the position after these moves has black to move. The Russian Game, also known as the Petrov or Petroff Defense, ignores the attack on e5 and counterattacks e4 instead. It has a reputation as one of the most solid defences in chess and a notorious reputation for producing draws at the highest level.
This position can also be reached by another move order, including 1.e4 e5 2.Nf3 Nf6 3.d4 exd4.
Symmetrical and simplifying. Many lines lead to early exchanges and level endgames, which is exactly the point for a player wanting a reliable answer to 1.e4. Sharper attempts by White exist but require Black to know a limited amount of theory.
Players who want a low-risk, low-theory answer to 1.e4 and are content to play for equality first.
This line is a variation within the Petrov's Defense family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.e4 e5 2.Nf3 Nf6 3.d4.
Each of these is a named opening reached by playing on from 1.e4 e5 2.Nf3 Nf6 3.d4. Open any of them to load the position on the board.