Analyze the current position

From Eric Schiller's Encyclopedia of Chess Wisdom p. 216

Permanent Advantages

• Material advantage
• More pawns in center
• Passed pawns
• Weak enemy squares (whether or not occupied by enemy piece)
• Healthier pawn structure
• More appropriate minor piecs

Temporary Advantages

• Vulnerable enemy piece
• Superior coordination
• Control of the center
• Control of a line
• Advantage in Space

Schiller goes on to say:

One aspect of the game that Alexander Kotov should have included in his list of tempoprary advantagess is the initiative. This is one of the most important factors in the middlegame, and also plays a role in the opening and endgame.

From the book by Silman:

• The interplay between knights and bishops (trying to make one superior to the other).
• Pawn structure
• Space
• Material
• Files and squares
• Development
• Initiative

Tactics (from the Table of Contents of Eric Schiller's Encyclopedia of Chess Wisom

• Pieces
  
  • Blocking
  • Choke (Brinkmate)
  • Clearance
  • Deflection
  • Decoy
  • Desperado
  • Destroying the Barrier
  • Discovered Attack
  • Discovered Check
  • Double Attack
  • Double Check
  • Forks
  • Forced Moves
  • Intermezzo
  • Overloading
  • Pins
  • Pursuit
  • Removing the Defender
  • Skewer
  • Trapped Pieces
  • Windmill
• Pawns
  • En Passant
  • Breakthrough
  • Forks
  • Promotion
  • Underpromotion