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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
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.
Schematic representation: (1) Video camera; (2) Shroud; (3) Video monitor; (4) Clear glass or beam splitter; (5) Image from subject; (6) Image from video monitor. A teleprompter, also known as an autocue, is a display device that prompts the person speaking with an electronic visual text of a speech or script.
The Marshall Attack (also called the Marshall Gambit) is a chess opening characterised by the moves: . 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3 d5. The Marshall Attack is an aggressive line in the Ruy Lopez, where Black sacrifices a pawn by playing d5 to gain initiative and a kingside attack.
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 Bongcloud Attack violates several principles of chess strategy by forgoing castling, impeding the movement of both the queen and the light-squared bishop, leaving the king exposed, and doing nothing to improve White's position. The lack of any redeeming feature, unlike some other dubious openings, puts the Bongcloud well outside of ...
The Stonewall Attack is a chess opening characterized by White playing pawns to d4 and e3, bishop to d3, knight to d2, and then completing the Stonewall structure by playing pawns to c3 and f4. This set-up is usually achieved by a 1.d4 move order but transposition is also possible via Bird's Opening , 1.f4.