puzzel5 and 6
https://www.chess.com/play/computer?fen=r1bqkbnr/pppnppp1/3p3p/6N1/4P3/8/PPPP1PPP/RNBQKB1R%20w%20KQkq%20-%200%201
https://www.chess.com/play/computer?fen=rnbqkbn1/ppppp3/7r/6pp/3P1p2/3BP1B1/PPP2PPP/RN1QK1NR%20w%20KQq%20-%200%201
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