This might be lengthy, but here is my approach to a chess game. I use an acronym that reminds me to look at certain factors on each move, specifically: FAST PAW PACT EPIDEMIC.
This equates to:
Force - Calculate the point value.
Attack - Look at and be aware of every possible exchange.
Space - I look at the square bordered by f3 - f6 - c3 -c6. I examine each square and see who controls it. I literally count the number of squares that I control versus the number that my opponent controls, to evaluate who is superior in space.
Time - I count each move to see who is ahead in time.
Pawn - I examine the pawn structure, and who has more pawns on the Q-side, the K-side, and the center.
Advantage - Okay, this gets laborious, but ... I look at every square on the board to see who controls it (versus just the center) and see if there is a positional advantage.
Weakness - See Advantage above.
Pieces - I compare the mobility of each piece. For example my opponents dark squared Bishop might have 8 possible squares to move while mine has 4. I make note of that and try to either increase the mobility of my Bishop, decrease the mobility of my opponents Bishop, or exchange the piece if its beneficial.
And Counter Attack Theory - This just reminds me to look at responses to any possible attack that I am planning, in general plans.
EPIDEMIC = Every Piece, Increase Deeper, Every Move, Increase Concentration - Basically, look at every possible move that I can make, no matter how ridiculous it looks. As well as look at every possible reply that my opponent can make. When I have looked 3 moves deep, stop and look deeper.
With that in mind, here is a game that I analyzed.