411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...Nf6/2. c4/2...e6/3. Nc3/3...Bb4/4. a3/4...Ba5
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Sämisch Variation rd nd bd qd kd rd pd pd pd pd pd pd pd pd nd bd pl pl pl nl pl pl pl pl pl rl bl ql kl bl nl rl
Sämisch Variation
4...Ba5??
Black failed to notice the fate of retreating the bishop to a5. White has a deadly move /5. b4/.