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This item is a game information page
It belongs to categories: Orthodox chess, 
It was last modified on: 2001-01-04
 By John William Brown. Centennial Chess. 10x10 Variant that adds Camels, Stewards, Rotating Spearmen and Murray Lions to the standard mix. (10x10, Cells: 100) [All Comments] [Add Comment or Rating]
Kevin Pacey wrote on 2018-03-01 UTCExcellent ★★★★★

This looks like a really interesting game. The movement rules certainly speed up play on a large board.

H. G. Muller wrote on 2016-11-17 UTCExcellent ★★★★★

Centennial Chess

This is another chess variant that is quite popular on this site. In contains the innovative feature of an asymmetric piece (the Rotating Spearman) that can change its orientation at the end of its turn, deciding how it will be able to move the next time. It also contains several other unorthodox pieces, and thus makes a grateful subject for presentation as interactive diagram:

files=10 ranks=10 promoZone=1 maxPromote=1 promoChoice=QSCLDMNBOR castleFlip=1 graphicsDir= whitePrefix=w blackPrefix=b graphicsType=png startShade=#639B5E lightShade=#FFFFDC symmetry=mirror pawn::fmWfcFifmnD::a3-j3 steward::mWcFifmnD:archbishop:e2,f2 camel::::b1,i1 spearman (middle):M:fRbmR:lance:b2,i2 spearman (left):L:flBbrmB:shieldL: spearman (right):D:frBblmB:shieldR: knight:N:::c2,h2 bishop::::c1,h1 lion:O:DAcK:cub:d1,g1 rook::::a1,j1 queen::::f1 king::KilO2irO3::e1

Piece overview (click on the piece name to display its moves)

Spearman orientation

The main challenge here of course was to implement the re-orietation of the Spearmen. This required some extra scripting, through one of the standard 'hooks' of the basic diagram script, providing the (optional) function 'WeirdPromotion'. Because the re-orietation of the Spearmen is treated as promotion of one piece type to another, where Middle,Left and Right Spearman are defined as three different piece types.

To make this work satisfactorily, the basic JavaScript powering the diagram had to be enhanced a bit, because it was necessary to make WeirdPromotion invoke the promotion procedure normally used in wester Chess variants, where you can select the promotion piece from the table by clicking there. Before this WeirdPromotion wasonly used in Shogi variants, where there is no choice other than to promote or not. The was solved by making the choice of the (normally non-existent) piece number 1022 indicated by WeirdPromotion be interpreted as a wildcard, allowing the user to select the actual piece from the table. Since WeirdPromotion (when supplied) is called after every move, it just has to test whether the moved piece is one of the Spearmen orientations, and if it is, wait for the user to select the new orientation.

To make this selection of new Spearman orientation easier, the table of pieces is printed next to the board permanently, rather than in the default way as an initially collapsed table under the board. Placement of the table anywhere in the page can be achieved by defining a HTML element <table id="pieceTable"></table> in the desired location.


Castling was also a bit problematic in this variant, because the King moves a different number of squares on the King side and Queen side. While the setup is such that what is left for white is right for black. So using Betza l and r modifiers would need a different description for white and black King. A new feature was added to the basic diagram script to handle this situation in a more convenient way: a new parameter 'castleFlip', when set to '1' in the diagram definition, will cause the meaning of left and right to be reversed when interpreting the XBetza description of castling for a black piece.

Andy wrote on 2007-02-21 UTCExcellent ★★★★★
I agree Centennial and Millennial Chess are two of best large-board CVs. 
Pieces are clear, not too many types, and interact well.

Andy Maxson wrote on 2007-02-21 UTCGood ★★★★
This game looks really interesting along with millenial chess I have actually thought of a game like this on ten by ten board with the orthochess setup pused one rank forwards so the pawns would not move differntly and adding camels. stewards, quang trung rooks and nonroyal kings

Antoine Fourrière wrote on 2005-12-11 UTCExcellent ★★★★★
I have just added the GC code for the above game between the inventor and
Ben Good. There seems to be a contradiction between this game and the zrf
and GC Preset. Do the Queens face each other?
(I have also changed the illegal 18... Le5 to 18... Le6; there may be
other errors in the transcription, since some moves look a bit strange.)

George Duke wrote on 2005-02-23 UTCGood ★★★★
'ABCLargeCV': In 1999 Centennial Chess threw down the gauntlet for decimal form, the strict 100 squares, to wit, 'the holy grail', words of John William Brown. In 2005 Antoine Fourriere in current comment at The Future thread writes, 'If you shift to 10x10, you have problems with the Knights and Pawns. Still I don't like 10x10.' Brown's Centennial has above average piece-mix. Two Pawn-types by the addition of Steward, a 'quadra-Pawn' moving in four possible directions. Camel; Murray Lion; Rotating Spearman, which would be more effectively implemented with capture on retreat too. Theoretically, one can imagine library of thousands volumes Centennial Chess analysis, and so also for hundreds other CVs. Hence the benefits of evaluative criteria, however weighted and discounted, for perfect symmetry, mirror symmetry, number piece-types, power density, board size, ratios leapers/riders etc., in order to help determine which CVs best fit certain selected criteria.

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