1
Open file2
Fool's mate3
Light square4
Dubious move5
Touch and move6
Over step7
Weak square8
Distraction9
Connected passed pawn10
Illegal move11
Backward pawn12
Block13
Bad move14
Smothered mate15
Triangulation16
Automaton17
Dynamic possibilities18
Transposition19
Queening square20
Triple rook21
Grand master