Discovered attack

A deduction in the chess game is a train a tile in which this occurs from the line of action of a langschrittigen figure ( bishop, rook, queen ), whereby the latter is indirectly activates and executes an attack. Often, a deduction is also a double attack. The trigger is an important element of chess tactics.

Discovered check

A special form of the deduction is the deduction of chess, in which an indirectly activated figure chess offers. Since this Chess bid must be parried, the withdrawing character receives wider range of motion than a typical train as an outgoing of her extra attack in Folgezug usually can not be met. It gives an effect as if the withdrawing character must perform two consecutive moves. This gives each trigger a high penetrating power. The withdrawing stone is called in chess jargon as Desperado, since it can behave " lawless " if the deduction threat is strong enough.

The case in which the drawn figure in check, while another, activated by the train langschrittige figure establishes a minor threat, has a similar effect.

Demonstration of a deduction Schaches

White on the train: Taking the tower, the rotor has the black king chess. Therefore, the tower may go unpunished to the danger of being lady Fields pull a7 or f5 and in turn attack the black lady. After a Three Kings of the tower strikes the lady on a5. Black could also consider Qd5, but then the runner simply hitting the lady. By a suitable tower trigger the lady is inevitably lost. Black on the train: The threat of ladies loss can be prevented only by avoiding the trigger chess with the train Kh8. Even a mating attack the lady on the front row is parried by the draw chess Tf1 play critical. Without the white pawn on b3 there for the lady by the attack on the runner with Da4, Db4 or Dc3 three other parades to the threat. An attack on the rotor by Dc5 other hand, would lead by the response Tc7 also for ladies loss.

Causing a deduction chess

In this position, most beginners will move without consideration Lxf7 . An experienced chess player but will also take the train Txf7 (without chess bids) into consideration. This creates the position of Diagram 1, but Black's train. It threatens a discovered check with ladies profit. In such situations, Black had to ward off this threat, he is leaving by the king from the hood, in this example Kh8.

After Txf7 would be a women's chess on the front row - Da1 or De1 - bad. White Tf1 would respond with chess Bid (! ) Of the rotor and then win the black queen.

Opening

Some opening traps are connected to a discovered check. An example is the variant of the Russian Defense:

After the trains 1 e2- e4 e7 - e5 2 Sg1 -f3 - f6 Ng8 3 Sf3xe5 Sf6xe4? (better d7 d6) 4 Dd1 - e2 Ne4 - f6? (better Qd8 - e7) 5 Ne5 - c6 offers white chess by the lady at the same time engages the white knight the black lady at. The lady lost.

Double Chess

If a discovered check the withdrawing character in turn also offers chess, then one speaks of a double check. Since in this case a chess takes place in two directions, which threatened King must draw. In another way, the chess commandments are not repel. The double chess often plays a crucial role in Shortcut strangled, Matt. Through the "en passant ", a further interesting possibility to generate a double check.

Here you will find two examples of double chess, which came into existence by a queen sacrifice:

• Evergreen game
• Réti - Tartakower, Vienna 1910

Dilemma

In rare cases you can bring with deduction chess a quandary. An example can be found in the article about Hans -Peter Rehm.

Battery

In the chess composition is called the constellation in which one side can give a discovered check, a battery.

• Chess motif