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.
The attack by
means of a discovered check is a deadly weapon that allows to gain
material, because the defender, engaged to stop the check, can't take
care of the attacked piece.
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.
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
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