411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e6/2. d4/2...d5/3. Nc3/3...Nf6/4. e5
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Classical Defence/Steinitz Variation
Black's Knight on f6 is attacked, granting white space and a tempo with the e5 pawn push. Most often Black retreats it to d7 as Black's only 2 other viable moves, Ng8 and Ne4, either give white a significant development advantage or allow white to compromise Black's central pawn structure by exchanging Knights. This variation is one of the highest-scoring against the French.
Theory table
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1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5
4
Main Line
(e5)Nfd7
=
References
French Defence