6-8 move sequence puzzles (Advanced)

Your goal is to find the BEST MOVE; Even if your move blunders a "tempo" or "waste time". The move sequence "usually" applies to what "depth" or "ply" would be needed from the potential puzzle solver to solve these puzzles. There are checkmate puzzles and advantage puzzles involved. Notice to all puzzle solvers, these puzzles ONLY HAVE 1 SOLUTION. If you don't believe the move provided is the only solution then analyse the position using a chess engine before complaining or suggesting in the comments. These puzzles are ALL ANALYSED by Stockfish 7 and are regularly updated (Last updated October 7th 2016 12:22PM New York Time): 

Very Good Puzzles.From where did you get them?

From everywhere, my chess.com games, chess puzzles, other chess player archives, etc.

There are several good puzzles, especially the last one which is a great endgame challenge!

solved where did you get these puzzles?