Mates
Annihilation of Defensive Barrier/Obliteration/Demolition of Structure
Clearance/Line Opening
Decoy/Attraction/Removal of the Guard
Defensive Combinations
Deflection
Desperado
Discovered Attack
Double Attack
Double Check
Drawing Combinations
Fortress
Greek Gift Sacrifice
Interference/Obstruction
Knight Fork(s)
Overloaded Defender(s)
Paralysed Piece(s)
Pawn Promotion/Pawn Breakthrough
Perpetual Check
Pins
Queen Sacrifice
Simplification
Skewer
Stalemate
Undermining/Removal of the Guard
Underpromotion
Weak Back Rank
Windmill
X-ray
Zugzwang
Zwischenzug
(from Cyrus Ladkawala)