Critical Squares Revisited (how do you know when there is a tactic)

Critical Squares Revisited (how do you know when there is a tactic)

CraiggoryC
NM CraiggoryC
Jan 20, 2015, 12:07 PM |
19

 

What are Critical Squares?

 

Go over the above diagram, and try to use critical squares to determine whether there is a tactic; and what the best move in the position for the future puzzles: