New topics:

• underpromotion
• the intermediate (in-between) move
• the rook pawn

Elaborating on already introduced material:

• Mini-plans
  Activating a piece, increasing activity, improving the pawn structure, exploiting vulnerability.
• Eliminating of the defence
  Eliminate two defenders with one piece, eliminate two defenders at the same time and luring away a defender with two functions
• Mate
  Bring in the chaser, the guard or the helper
• Opening
  Developing and well-known combinations in the opening
• X-ray
  X-ray as an aid in other combinations and x-ray protection
• Defending against mate
  An addition to the lesson in Step 2
• Pinned pieces
  Combinations that make use of the pin
• The square of the pawn
  An addition to the lesson in Step 3
• Discovered attack
  Special forms: the intermediate (in-between) move, elimination of the defence and trapping