411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...c5/3. Nxe5/3...Qe7
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3...Qe7
Black tries to do the best in the position. Black develops the queen and attacks the knight, but it also blocks in the dark squared bishop. For this reason, after the white knight moves, black's move might be something like 4...g6.
1. e4 e5 2. Nf3 c5? 3. Nxe5! Qe7