Blog for weaker players- the pin
the pin is a very good tactic you should apply in your games because the peice that is pinned can't move or else something bad is gonna happen
here is a puzzle were a pin wins a game\
another very useful pin is the absolute pin where the piece is pinned to the kingshown in this puzzle
there is also a complicated rule: do not attack a queen with a bishop that is supported by a knight which is pinned to a queen unless you can take something after taking the queen other than a pawn.
Here is a puzzle that shows that
the pin is very usefull so try to use it more in games