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A chess problem theme in which the solution includes pawn promotions to all possible pieces (in orthodox chess, to bishop, knight, rook and queen; in fairy chess, possibly to fairy pieces). anti-Bristol The interference of one black piece by another like-moving one on the same line (if the pieces are on different lines, it is a Holzhausen).
Chess problems are divided into orthodox and heterodox types, both covering a variety of genres. Orthodox problems employ the standard rules of chess and involve positions that can legally arise from actual gameplay. The most common form of orthodox problem is the directmate, which stipulates checkmate in n moves, usually two or three. The ...
Although a constraint on orthodox chess problems is that the original position be reachable via a series of legal moves from the starting position, most problem positions would not arise in over-the-board play. There is a specific stipulation, that is, a goal to be achieved; for example, to checkmate Black within a specified number of moves.
The following table shows some game pieces of unorthodox chess, from fairy chess problems and chess variants (including historical and regional ones), and the six orthodox chess pieces. The columns "BCPS", "Parlett" and " Betza " contain the notation describing how each piece moves.
The Problemist continues to be devoted essentially to orthodox chess problems, including regular columns on endgames, selfmates and helpmates using the orthodox chess pieces. A fairy chess column was reintroduced by A. S. M. Dickins in March 1968.
There are three riders in orthodox chess: the rook is a (0,1)-rider; the bishop is a (1,1)-rider; and the queen combines both patterns. Sliders are a special case of riders that can only move between geometrically contiguous cells. All of the riders in orthodox chess are examples of sliders.
In orthodox chess, this would be illegal since the rook would be giving check to the king, but under fairy chess conditions, this might not actually be check. The diagrammed problem involves castling with an opposing rook under the Koko fairy condition (each piece must end up adjacent to another piece when moving). [45]
The Queen's Gambit Declined (or QGD) is a chess opening in which Black declines a pawn offered by White in the Queen's Gambit: 1. d4 d5 2. c4 e6. This is known as the Orthodox Line of the Queen's Gambit Declined. [1] When the "Queen's Gambit Declined" is mentioned, it is usually assumed to be referring to the Orthodox Line; see "Other lines" below.