The winning move: can you find it ?

In today's selection, it is not about calculating 8 moves ahead as well as several complicated lines. but finding THE move !!

There is 1 move which either Lc0 or Stockfish would assess as the best in each position.

Once the idea found,  the rest of the game would be relatively easy no matter what your opponent chooses. You are looking to get a decisive advantage, not necessarily checkmate. in engine terms + 3, or +5, or +7 in the eval. Not +0.3 or +1.2;

Give yourself 5 minutes for each position.

Position 1: Black has a decisive move. can you spot it ? 1 point 

Position 2:Black to get decisive advantage .(1 point for the best move, 0.5 point for second best move ) 

Position 3: Black to play-> what is the best move here ? (1 point)

Take an entire extra point if you can name the player with white and the player with black.

Position 4: Again Black strikes. can you find the winning move ? 1 point

add 0.5 point if you can name the famous player with the black pieces.

Position 5: White to play this time. How to proceed ?  1 point if you get it right.

Solutions: please drop answers in the comments below . I am sure that my readers can figure it out. if you are not sure, ask your questions in the comments section as well. If you cannot wait, after solving the position yourself, click the "go to Analysis" button (bottom left of diagram) and let Stockfish run at Depth=20. This should do it. Tell us your overall score.

Scoring:

1 or 2 points : try to solve more puzzles.

3 points : indicative of a good player.

4 points : tactics is your strength obviously !

5 points : Congrats !! You are much stronger than I am !

> 5points : Amazing !!! Incredible performance !!!

Good Luck