[White "Daily tactics #8"]   [Black "Black to play and win"]   [Result "0-1"]   [FEN "N6k/pp4bp/6p1/2P5/4K3/1QN1P3/PP3r2/R1B2q2 b - - 0 1"]   {The key move here is :}  1... Rd2!! { The threat is  Qf5}  2 Bxd2 (2 Qe6 Qg2+ 3 Kf4 Rf2+ {is checkmate}) Qf5  {mate}