411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...f5/4. Nc3/4...fxe4/5. Nxe4/5...d5/6. Nxe5/6...dxe4/7. Nxc6/7...Qg5/8. Qe2/8...Nf6/9. f4
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tright Ruy Lopez, Schliemann Defence rd bd kd bd rd pd pd pd pd pd nl nd bl qd pd pl pl pl pl pl ql pl pl rl bl kl rl Common moves: 9...Qxf4 - Main Line 9...Qh4+ - Czech Variation
9...Qxf4 is the main line, because why not take a pawn if White's going to leave them lying around.
9...Qh4+ is similar to the main line, in that the Black queen ends up on h3 via h4 in both lines, except without the bonus of having taken a pawn. A pawn is a pawn!
Ruy_Lopez#Schliemann_Defence:_3...f5