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DOUBLE ATTACK
Tactical theme that allows a
material gain thanks to a move that attacks two pieces at a time.
The double attack is effective only if the defender can't counterattack
in turn an opponent's piece, moving one of the attacked pieces.
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DISCOVERY CHECK
The attack by means of a
discovery check is a deadly weapon that allows to gain material, because
the defender, busy to stop the check, can't take care of the attacked
piece.
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IMPRISONMENT AND
DOMINATION
The imprisonment is a manoeuvre that allows to cage
an enemy piece in order to capture it or to make it harmless.
The domination is a similar theme and concerns the absolute
control of the movement of an opponent's piece in order to achieve the
capture of that piece.
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ENFILADE
When an opponent's piece is positioned on the same
line occupied by the opponent's King, it is possible to gain a material
advantage by means of the enfilade: you deliver check to the King
along such line in order to capture the piece placed behind him
once the King has moved.
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ZUGZWANG
Zugzwang is a German compound word (literally forced move) that,
in chess, indicates the disadvantage associated with the obligation to
move: the zugzwang occurs when a player, that must move, has at his
disposal only moves that make his position worse thus causing the defeat
(or preventing the victory).
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