Chess Opening Theory/1. e4/1...Nf6/2. e5/2...Nd5/3. d4/3...d6/4. Nf3

= Alekhine's Defence : Modern Variation = Black still lacks space. He must at all cost avoid a passive play which would allow White to crush him quickly.

Three options are playable :
 * /4...Bg4/ reduces White's control over the center. Black often accepts to break his bishop pair and takes the knight.
 * /4...g6/ prepares king's bishop fianchetto.
 * /4...dxe5/ is sometimes seen. It frees space for Black but leaves him with no weapons to counter White's advance in development. Moreover, this move seems to be out of the "spirit" of the opening.

Theory table
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'1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3'