Best heuristic for memorizing positions in chess Opening variations may be memorized by recalling what the objective behind every move is. For example, the first few moves of the Ruy Lopez fight to control e5.

In the middlegame, we may find ourselves thinking about a critical move - a move that requires tactical precision. Said tactic, if performed correctly, will yield an improved position. The tactic may reach several moves, usually six or seven and occasionally ten moves. 

We would like to memorize a position in the middle of our visualized tactic as a "mental checkpoint". In case we don't like a move, say our eighth move, we can return to the position after the 5th move in our visualized tactic instead of the current position (move one). 


What is a consistent method for creating the checkpoints? 
Next, where in the tactic do we set the checkpoint? Do we set it every fourth move, do we only create one, or do we only create it in quiet circumstances?
If the method is not consistent, such as it does not work for all positions, list the exceptions.
This seems a bit theoretical/artificial to me.

I'd say, just do whatever works best for you. In the end all this should happen subconsciously without you thinking about any "methods".


  
  What is a consistent method for creating the checkpoints?
  


Do you mean, how to memorize a position 5 moves from now? For any reasonably strong player this is not a problem (could be more problematic with positions very far in the future). You could use similar methods as in blindfold chess, e.g. you could combine groups of pieces (e.g. store the information of "fianchettoed bishop" instead of the position of each piece separately). Also for tactics very often only a small part of the board/limited number of pieces are relevant; so you could ignore irrelevant pieces.


  
  Next, where in the tactic do we set the checkpoint? 
  


Could make sense to create them at points where you have a number of alternative moves. Also, could create them at positions that are easy to remember.