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1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.c4 Nb6 5.f4 Bf5 · ECO B03
Alekhine Defense: Four Pawns Attack, Trifunovic Variation is a chess opening that arises after 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.c4 Nb6 5.f4 Bf5. It is classified B03 in the ECO system, and the position after these moves has white to move. The Alekhine Defense attacks the e4 pawn with the knight on move one, deliberately inviting White to chase it with pawns. Black's plan is that the advancing pawn centre will become overextended and can then be attacked at its base.
Provocative by design. After 2.e5 Nd5 3.d4 d6 White has an imposing centre and Black has spent moves on a single knight — the whole opening rests on whether that centre proves strong or loose.
Players who understand hypermodern ideas and want to take opponents out of familiar territory with Black.
This line is a variation within the Alekhine Defense family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.c4 Nb6 5.f4 Bf5.