Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...a6/4. Ba4/4...Nf6/5. O-O/5...Nxe4/6. d4/6...exd4/7. Re1/7...d5/8. Nxd4/8...Bd6/9. Nxc6/9...Bxh2/10. Kh1/10...Qh4/11. Rxe4

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< Chess Opening Theory‎ | 1. e4‎ | 1...e5‎ | 2. Nf3‎ | 2...Nc6‎ | 3. Bb5‎ | 3...a6‎ | 4. Ba4‎ | 4...Nf6‎ | 5. O-O‎ | 5...Nxe4‎ | 6. d4‎ | 6...exd4‎ | 7. Re1‎ | 7...d5‎ | 8. Nxd4‎ | 8...Bd6‎ | 9. Nxc6‎ | 9...Bxh2‎ | 10. Kh1‎ | 10...Qh4
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Ruy Lopez:Riga Variation
a b c d e f g h
8a8 black rookb8 black kingc8 black bishopd8 black kinge8 black kingf8 black kingg8 black kingh8 black rook8
7a7 black kingb7 black pawnc7 black pawnd7 black kinge7 black kingf7 black pawng7 black pawnh7 black pawn7
6a6 black pawnb6 black kingc6 white knightd6 black kinge6 black kingf6 black kingg6 black kingh6 black king6
5a5 black kingb5 black kingc5 black kingd5 black pawne5 black kingf5 black kingg5 black kingh5 black king5
4a4 white bishopb4 black kingc4 black kingd4 black kinge4 white rookf4 black kingg4 black kingh4 black queen4
3a3 black kingb3 black kingc3 black kingd3 black kinge3 black kingf3 black kingg3 black kingh3 black king3
2a2 white pawnb2 white pawnc2 white pawnd2 black kinge2 black kingf2 white pawng2 white pawnh2 black bishop2
1a1 white rookb1 white knightc1 white bishopd1 white queene1 black kingf1 black kingg1 black kingh1 white king1
a b c d e f g h
Position in Forsyth-Edwards Notation (FEN)

r1b1k2r/1pp2ppp/p1N5/3p4/B3R2q/8/PPP2PPb/RNBQ3K b

Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 exd4 7. Re1 d5 8. Nxd4 Bd6 9. Nxc6 Bxh2 10. Kh1 Qh4 11. Rxe4

Ruy Lopez, Riga Variation, Main Line

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White takes the knight on e4, sacrificing the exchange to remove black's pressure on the f2 square. Now black has two options to retake: with 11...Qxe4 or 11...dxe4.

It turns out that 11...Qxe4, while possibly appealing because it attacks the a4 bishop, is an error. Moving the queen away lessens the pressure on the f2 square and leaves the h2 bishop hanging. White can counter the attack on his bishop with either 12. Nd4 (blocking the attack), or 12. Nc3 (defending the bishop).

Therefore, 11...dxe4 is the main line.

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References

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Wikipedia has related information at Ruy Lopez

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