Random failures Fischer

The random failures Fischer (in English, Fischer Random Chess ) are an alternative nonorthodoxe Jeu of failures imagined by the ex-champion of the world Bobby Fischer, and published the June 19th 1996 with Buenos Aires.

According to Fischer, the fact of randomly drawing the initial position from the parts offers the advantage of preventing the préarrangées parts and supports the creativity échiquéenne and the talent rather than the memorizing and the analysis of multiple alternatives of openings.

The provision of the parts

The rules of the game are exactly the same ones as with the orthodoxe failures, except that the initial site of the parts of the first and the last line is drawn with the fate.
  • the king must be some share between the two turns so that the small one and large the castling is both possible in all the positions.
  • the insane must obligatorily be placed on boxes of opposite colors;
  • the black parts are laid out vis-a-vis the white ones symmetrically, exactly in the same order. Example: so white side, there is a lady in g1, and a riding in c1, black side, the lady will be in g8 and the rider in c8.
  • the pawns are laid out in a usual way.

Drawing lot

There exist several “good” methods to draw with the fate the initial position. One of most convenient was developed by Edward Northam and consists in using a coin and to carry out 2 successive pullings while allotting:
  • 0 points for the side pile during the first test, and 1 point for this same side during the second pulling,
  • 2 points for the side face in all the cases.
The addition of two pullings gives a number from 1 to 4, which makes a random system with four possibilities.

Procedure to follow

The drawing lot is done only for with dimensions white. The black parts will be placed symmetrically.

  1. Placement of Insane the
    Commencez by the pulling of the Fou of black boxes, while counting always from left to right. ( a1 = 1 , c1 = 2 , e1 = 3 , g1 = 4 ).
    Ensuite, draw with the fate the destination from the Fou from white boxes, while following a similar procedure.

  2. Placement of the King
    Le King in front of imperatively being located between the two turns, be unaware of the two free boxes closest to the band and count (starting from the left) by considering only the vacant boxes.
  3. Placement of the Turns
    Placez a Tour on each side of the king by adapting the random system to the number of boxes possibles.
    Exemple: when there are 3 possible boxes, remade pulling in the possibility where you obtain one 4, and when there are 2 possible boxes, you will deduce that you have only to carry out one pulling.
  4. Placement of the Lady and the Riders
    Il remains nothing any more but 3 unoccupied boxes. Draw with fate site from Lady (remade pulling if you obtain one 4),
    placez finally both Cavaliers on the two remaining boxes.

Castling

The castling is one of the problems of the random failures Fischer which made run much ink and caused many confusions.

The final position of the castling is exactly the same one as in the orthodoxe failures, it does not matter the initial position.

After the castling on the side has , which notes “O-O-O”, the king is in C and the tower in D whereas after the castling on the side H , which notes “O-O”, the king finds himself in G and the tower in F . The boxes which are found between the initial site of the tower and its final box just as those which are between the initial box of the king and that of its arrival must be vacant (except if they are occupied by the part taking part in castling) and must answer the same requirements as with the orthodoxe failures. In certain positions, one of the two parts does not move.

Unfortunately, in certain publications, the rules of castling are not clear enough, which lets believe that in some specific cases, the king could “pass over” other parts that those which take part in castling (the tower “roquante” and the king). A possibility completely rejected by the rules of use in the large active players as Peter Lékó, Peter Svidler, Michael Adams, Eric van Reem, Schmitt and Scharnagl.

The correct way of roquer

The least ambiguous way of roquer is initially to move the king out of the chess-board, near the place where it finishes his displacement and then, to move the tower on its final box, then to supplement the blow while placing the king on his final box. This way has the merit to adapt to all the situations of play, even during the use of an electronic chess-board, because the program cannot interpret the blow differently.

Identification of the initial positions

The failures random Fischer allow 960 initial positions different from the parts. R. Scharnagl the identification of each of the 960 initial positions by a number from 0 recommends to 959. One obtains the identification number of a position given by using code KRN (figures from 0 to 9 representative the order in which find the turns, the riders and the king, on the vacant boxes, once the insane ones and the lady placed) and the following equation:

Here now method to find the site initial of the parts according to the identification number:

  • Divide the number by 4 and you obtain a number “X”. This number finishes is by .00 (indicating the first puts on the left), .25 (1/4) (indicating the second), .50 (2/4) (the third) or by .75 (3/4) (the fourth). Place the insane white on the suitable box. .00 = ''' B ''' .25 = ''' D ''' .50 = ''' F ''' .75 = ''' H '''
  • Divide the number “X” by 4 and you obtain a number “Y”. Function in the same way that at the preceding stage to determine the box of the insane black.
  • Divide “Y” by 6 and you obtain figure “Z”. This figure (from 1 to 9) can now finish 6 different ways: .00 - .16 - .33 - .50 - .66 - .83 Place the lady on its box while always following the same technique. Figure “Z” corresponds to code KRN, then place the turns, the riders and the king consequently.

The orthodoxe provision of the parts should correspond to the identification number 518 .

Other names

The random failures Fischer are sometimes called:
  • Fischer Random Chess ;
  • Chess960 ;
  • FullChess ;
  • F.R. Chess ;
  • Modified Randomized Chess .

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