Interference / Interposition: a theory course

Block a defensive line so a piece can no longer protect its target.

5 lessons, each followed by its own puzzle drill, then 10 themed puzzle packs.

• The Block — Place a piece between the defender and its target.
• Interference by Sacrifice — Check what each capture of the blocking piece leaves exposed.
• Interference to Mate — Block the line protecting the mating square.
• Force the Block — Use a forcing move to make the opponent block its own defender.
• Block Two Defenders — Block two defensive lines at their intersection.