Pandolfini’s Puzzler #5 – The Missing Knights – ChessKid.com https://www.chesskid.com/learn/articles/pandolfinis-puzzler-5---the-missing-knights
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Ne5 d5 3. Nc6 Nfd7 4. Nxb8 Nxb8. Another variation is 1. Nf3 d5 2. Nd4 Nf6 3.