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In this game I tried to play Petrov, which I like and thought I knew... but I didn't know what to play to 3.d4 Suggestions?
I knew three variations: 3.Nc3, 3.Bc4 and 3.Ne4... but I didn't know 3.d4... I guess you should know them all before playing a defense... and it may be popular, but I don't remember seeing it... after I posted the game here I researched it: 3.d4 and black can take either pawn... it is the Steinitz variation all right; usually it goes: 3... exd4 4.e5 5.Ne4 Qd4 d5 6.exd6 Nxd6 7.Nc3 Nc6 8.Qf4 and both sides are OK if following the basic principles... but this is what happens when you think you know the theory! By the way... wikipedia can help a bit!