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In chess, an X-ray or X-ray attack is a tactic where a piece indirectly controls a square from the other side of an intervening piece. Generally, a piece performing an X-ray either: effects a skewer, [1] [2] [3] indirectly attacks an enemy piece through another piece or pieces, or; defends a friendly piece through an enemy piece.
The Durkin Opening (also known as the Durkin Attack or the Sodium Attack) is a rarely played chess opening that consists of the following move: 1. Na3. The Durkin Opening is named for Robert T. Durkin (1923–2014) of New Jersey. The name "Sodium Attack" comes from the algebraic notation 1.Na3, as Na is the chemical symbol for the element sodium.
The Barnes Opening (sometimes called Gedult's Opening) is a chess opening where White opens with: . 1. f3. The opening is named after Thomas Wilson Barnes (1825–1874), an English player who had an impressive [1] eight wins over Paul Morphy, including one game where Barnes answered 1.e4 with 1...f6, known as the Barnes Defence.
The Napoleon Opening is named after the French general and emperor Napoleon Bonaparte, who had a deep love of chess but was said to be a mediocre player. [1] The name came into use after mid-nineteenth century publications reported [2] that he played this opening in an 1809 game [3] that he lost to The Turk, a fake chess automaton operated at the time by Johann Allgaier.
The Jerome Gambit is an unsound chess opening which is an offshoot of the Giuoco Piano. It is characterized by the moves: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. Bxf7+?! Kxf7 5. Nxe5+ Nxe5. White sacrifices two pieces (and eventually regains one) for two pawns in hopes of exposing Black's king and obtaining a mating attack. The line was a brief fad ...
The Amar Opening (also known as the Paris Opening, [1] or the Drunken Knight Opening) is a chess opening defined by the move: . 1. Nh3. Analogous to calling the Durkin Opening the "Sodium Attack," this opening could be called the Ammonia Opening, since the algebraic notation 1.Nh3 resembles the chemical formula NH 3 for ammonia.
The Traxler Counterattack, also known as the Wilkes-Barre Variation, is a chess opening that begins with the moves: . 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 Bc5!?. The opening is a variation of the Two Knights Defense [1] [2] where White has chosen the offensive line 4.Ng5, immediately attacking the f7-square with the knight and bishop, and Black has replied 4...Bc5, counterattacking the f2-square.
The Max Lange Attack is a chess opening that can arise from several different opening lines, including the Two Knights Defense, Petroff's Defense, Scotch Gambit, Bishop's Opening, Center Game, and Giuoco Piano. [1]