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Move the white knight from e4 to d6 for checkmate. The black pawn at e7 cannot capture the white knight because the black king would be in check by the white queen at e2. The white knight cannot checkmate the black king by capturing the black knight at f6.  The black pawn at g7 will capture the white knight.

Mueve el caballo blanco de e4 a d6 para dar jaque mate. El peón negro en e7 no puede capturar el caballo blanco porque el rey negro estaría en jaque por la dama blanca en e2. El caballo blanco no puede dar jaque mate al rey negro capturando al caballo negro en f6. El peón negro en g7 capturará el caballo blanco.