411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Bc4/2...Nf6/3. f4/3...Nxe4/4. d3
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Bishop's Opening: Berlin Defence, Greco Gambit
Bishop's Opening: Berlin Defence, Greco Gambit
4. d3
White attacks Black's knight and avoids losing material with the tempting 4. fxe5??. Black can choose to retreat it with 4...Nd6, or try the same attacking idea if White played 4. fxe5??, 4...Qh4+. However, unlike the fxe5 version, 4...Qh4+ does not win a rook as after 5. g3! Nxg3 6. Nf3! the queen cannot go to e4 to check the White king and then take the rook on h1 with the knight on g3.