You are on the backup site for Any posts, moves, or other changes you make here will not be permanent, because the pages and database from the main site will be backed up here every midnight EST. Additionally, things may not be working right, because this site is also a testbed for newer system software. So, if you are not here to test, develop, or merely read this site, you may want to change .org to .com in the navigation bar and go to the main site.

The Chess Variant Pages

The Piececlopedia is intended as a scholarly reference concerning the history and naming conventions of pieces used in Chess variants. But it is not a set of standards concerning what you must call pieces in newly invented games.

Piececlopedia: Coordinator

Historical notes

The coordinator was invented by Robert Abbott for his game Ultima . The rules for Ultima were first published in 1962.


The coordinator moves as a chess queen. At the end of its move, any enemy piece that is on the same file as the coordinator and same rank as the friendly king, or on the same rank as the coordinator and the same file is the king, is captured. The coordinator can never move to an occupied square. Note that it is possible for the coordinator to capture two pieces in one move.

Movement diagram

In the diagram below, the coordinator (represented by the symbol for the rook, since the game Ultima uses the chess rook to represent the coordinator) can move to any of the circles marked with a black circle. If it moves to b7, c7, or d7, it captures the bishop on g7. If it moves to e4, it captures both the rook on e2 and the pawn on g4. Note that moving the white king to f3 or f1 does not result in a capture of the knight on g6 - a capture is only made when the coordinator moves.

This is an item in the Piececlopedia: an overview of different (fairy) chess pieces.
Written by Benjamin C Good.
WWW page created: September 14, 1998.