# Looking for a chess variant with a circular board

I am looking for a certain chess variant played on a circular board.

The variant is played with the usual chess pieces (no fairies involved) on a peculiar circular board. The central part of the board is filled with triangles (alternating black and white) and is part of the playing field. The outer rings are made of only slightly deformed squares. The board was checkered (alternating black and white fields).

A particular feature of the Chess Variant I'm looking for is the movements of the bishop: It changes colour when moving across the centre of the board (a diagonal step is analysed as one step forward followed by one step orthogonally sidewards). Also the Knight has very peculiar moves in the centre of the board.

I remember to have seen a description of this Chess Variant in a German student's newspaper in the 1980s (probably issued by Fachschaft Physik at Ruhr-Universität Bochum). I was not able to retrieve this variant anywhere, it is AFAIK not in the "circular board" category at http://www.chessvariants.org

EDIT: it is a two-player variant (I thought of this as a default and didn't mention it explicitly). The rooks moved either radially or orbiting around the circles.

I'd like to know: Name of the variant, name of the inventor and date of first publication, full ruleset (initial position, exact board and rules).

EDIT2: The number of the triangles in the central disk must be divisible by 4 (it's probably 16) because triangles of the same colour face each other. Another feature of the bishop's movement I remember again now: A bishop crossing the centre can actually choose two different continuations because the diagonal movement can be achieved following two different "staircases" of alternating orthogonal moves.

• I found centre chess, but there are no rules that I can see. Does the board look like that? Perhaps like hyperchess, this is just ordinary chess on a board that obscures the ordinary spatial relations but does not actually change them. – hkBst Feb 11 '16 at 9:16
• @hkBst: Yes, the overall look of the board is like that. The description I remember was in black and white, so there were no fancy coloured boundary squares. Centre Chess is different from the variant I remember in the feature, that in the centre triangles of different colour face each other, where in the variant I am looking for triangles of the same colour faced each other. – jk - Reinstate Monica Feb 11 '16 at 9:59
• What stops the rooks from just starting to take pieces on move 1 ? – edwina oliver yesterday
• @edwinaoliver I do not remember that detail, unfortunately – jk - Reinstate Monica yesterday

A few suggestions:

This looks sufficiently circular and weird, though I didn't find the rules.

And there is apparently a circular citadel chess, with triangles in the middle.

• Nice suggestions, but none of the boards look even closely like the one I have in mind. It was a two-player variant (I have clarified this now). The central disk consists of 16 (not sure about the exact number) alternating black and white triangular segments. – jk - Reinstate Monica May 26 '15 at 9:32
• Similar to this? Not circular, but the bishop moves change color. abstractstrategygames.blogspot.de/2010/10/diamond-chess.html – BlindKungFuMaster May 26 '15 at 9:49
• No, not similar. The outer rings of the variant I'm looking for are just made of trapezoids (only slightly deformed squares). – jk - Reinstate Monica May 26 '15 at 9:54
• Hyperchess (the first link in this answer) appears to be exactly the same as chess, except that it is more challenging to interpret valid moves, because the board is distorted (but not different). It is thus just a visual gimmick. – hkBst Feb 11 '16 at 9:13
• Really? I would have thought that you can move your rook in a circle around the whole board, certainly not something you can do in normal chess. – BlindKungFuMaster Feb 11 '16 at 9:30

Take a look at Diplomat Chess https://en.wikipedia.org/wiki/Diplomat_chess

• Welcome to Chess Stack Exchange. We generally don't like link-only answers; you could improve your answer by citing / summarizing so that it's valuable even if the link might break. – Glorfindel Jan 15 '18 at 11:41
• That one is pretty similar with respect to the bishops, but not yet the variant I am still searching for—it lacks the segmentation of the central field. It is also too young. – jk - Reinstate Monica Jan 15 '18 at 13:11