411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Nc3/3...Nf6/4. Bb5/4...Bc5
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Ruy Lopez: Four Knights Game
Spanish Four Knights Game rd bd qd kd rd pd pd pd pd pd pd pd nd nd bl bd pd pl nl nl pl pl pl pl pl pl pl rl bl ql kl rl
If Bxc6 dxc6 Nxe5? is a mistake after Bxf2 targeting the weak f2 square by sacrificing the bishop. After Kxf2, Qd4+ forks the King and the Knight. After Ke2 Qxe5, White has a king which cannot castle in a relatively open position.
Theory table
1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bc5
O-OO-O
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References