411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e6/2. d4/2...d5/3. Nc3/3...Nf6/4. Bg5/4...dxe4
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Burn variation Classical variation C13
4...dxe4 · Burn variation
Black chooses to exchange pawns in the center in order to protect the knight on f6.
White should simply respond by recapturing on e4 with /5. Nxe4/, after which Black should decide on how to defend their knight and potentially whether to recapture it with a piece or with the g7-pawn.
Theory table
5. Nxe4 Be7 6. Bxf6 Bxf6 5. ... ... 6. ... gxf6 5. ... Nbd7 6. Nf3 h6 7. Nxf6 Nxf6
References
French Defence Burn_Variation:_4.Bg5_dxe4