411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...g6/2. d4/2...Nf6/3. e5/3...Nh5/4. Be2
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Modern Defence: Norwegian Defence B06 Modern Defence
4. Be2
White develops their f1 bishop and pursues the h5 knight and threatens to win a pawn with Bxh5. However, the best and most popular move is the shocking /4...d6/, allowing White to win a pawn.