Ruy Lopez, Schliemann Defense (C63)

The <Jaenisch Gambit> / Schliemann Defence or Schliemann–Jaenisch Gambit (ECO C63), <3...f5!?>, is a sharp line in which Black plays for a kingside attack, frequently sacrificing one or two pawns. Considered by many to be somewhat dubious, it is occasionally used in top-level play as a surprise weapon. This variation was originated by Carl Jaenisch in 1847 and is sometimes named after him.

1. e4 e5 2. Nf3 Nc6 3. Bb5 f5

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Opening Explorer (1602 games)

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The most common responses for White to 3...f5!? are <4.d3> or 4.Nc3, with play after <4.Nc3 fxe4 5.Nxe4> going <5...d5>, with great complications to follow, or <5...Nf6>, which generally leads to quieter play.

1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. Nc3 fxe4 5. Nxe4 Nf6

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Opening Explorer (311 games)

1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. Nc3 fxe4 5. Nxe4 d5 6. Nxe5 dxe4 7. Nxc6

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Opening Explorer (171 games)

1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. Nc3 fxe4 5. Nxe4 d5 6. Nxe5 dxe4 7. Nxc6 Qg5 8. Qe2 Nf6 9. Ne5+ c6 10. f4 Qxf4 11. d4 Qh4+ 12. g3 Qh3 13. Bc4 Be6

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Opening Explorer (62 games)

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Although later named for German lawyer Adolph Karl Wilhelm Schliemann (1817–1872), the line Schliemann actually played in the 1860s was a gambit variation of the <Cordel Defence (3...Bc5 4.c3 f5)> M Lange vs A Schliemann, 1868.

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The Schliemann Defence Deferred, <3...a6 4.Ba4 f5>, is rarely seen, with practically its only top-level appearance being in the 1974 Candidates Final, when Viktor Korchnoi adopted it versus Anatoly Karpov.Karpov vs Korchnoi, 1974 It is considered inferior to the regular Schliemann, since White can answer effectively with <5.d4! exd4 6.e5>.

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Spieler-Biographien, deutsch:
Wikipedia article: Carl Ferdinand Jänisch || Wikipedia article: Adolph Schliemann#Schachspieler