In the game of Sissa we have additionally to normal chess more squares and a piece called Sissa.
A Sissa moves as follows: in one turn, first, the Sissa moves one or more squares like a rook or a bishop, and then the Sissa moves the same number of squares like the other of the two (bishop or rook). So, the Sissa has the following options:
- First, it moves a number of squares as a rook. Then it makes a corner of 45, 135, 225, or 315 degrees, and then moves the same number of squares as a bishop. All squares that are passed by must be empty, i.e., a Sissa does not jump over pieces.
- First, it moves a number of squares as a bishop. Then, it makes a corner of 45, 135, 225, or 315 degrees, and then moves the same number of squares as a rook. Again, all squares passed by must be empty.
Bishops have, in addition to their normal diagonal movement, one extra property: the bishop moves one square horizontally or vertically at the first time it moves during the game. This may be done only once, with one of the players bishops.
Also, for one of the bishops of the player, the first move made with this bishop must be of this special type. This move is called conversion. Note that a player may choose which bishop he converts, but if he makes a normal move with one of his bishops, the first move made with the other bishop must be a conversion move. Note also that a player never can make more than one conversion move in a game, and a promoted bishop does not make conversion moves. It is possible to take a piece of the opponent by conversion.
I don't know the castling roles of Sissa. So I have taken the role of Symmetric Sissa, which was invented by Cetina in the same year: The king goes always three steps in castlings.
Sissa is a chess variant invented in 1998 by Carlos Cetina. The piece called Sissa is taken from another chess variant of Cetina, called Coherent Chess. The piece is named after the probable inventor of Chaturanga. |
