XXIX - Skewer
XXX - Blockaded Pawn
XXXI - Breakthrough
XXXII - Defence
XXXIII - Oblique Move
XXXIV - Middlegame
XXXV - Weak Square
XXXVI - Decisive Move
XXXVII -Overload
XXXVIII - Doubled Pawns
IXL - Smothered Mate [NC-17]
XL - Advantage
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