411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...c6/3. Nxe5/3...Nf6/4. d3/4...Qa5/5. Nc3
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Gunderam Gambit Accepted rd nd bd kd bd rd pd pd pd pd pd pd pd nd qd nl pl nl pl pl pl pl pl pl pl rl bl ql kl bl rl 1. e4 e5 2. Nf3 c6 3. Nxe5 Nf6 4. d3 Qa5+ 5. Nc3
This is the best and most popular block. Black's only move is /5...Qxe5/.