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UPDATED! This item is a game information page
It belongs to categories: Orthodox chess, 
It was last modified on: 2019-07-06
 By Prussia  General. StrataChess v1.0. (Updated!) separate Strategic and Tactical gameplay. 2-6 players. Element of Chance. Terrain. Build your own armies.[All Comments] [Add Comment or Rating]
Fergus Duniho wrote on 2019-07-23 UTC

I have added a page rule on Cloudflare for bypassing the cache for PHP scripts with the extension .php, leaving one exception for the drawdiagram.php script, which should be cached. This should make scripts for editing content load the latest changes.

Greg Strong wrote on 2019-07-23 UTC

Try clicking the browser's Refresh button after you click to Edit the Page Contents.  That should update the text.

Prussia General wrote on 2019-07-22 UTC

@ Moderators - about 2 weeks ago I made some edits to the posting. However this is not yet reflected after I click "Edit the post" so when I edit, I had to work off an older version. How could I get the latest html version from the post? 

This item is a miscellaneous item
It belongs to categories: Orthodox chess, 
It was last modified on: 2015-12-11
 Author: Fergus  Duniho. Home page of The Chess Variant Pages. Missing description[All Comments] [Add Comment or Rating]
Fergus Duniho wrote on 2019-07-22 UTC

If that is still happening, please provide details on how to replicate the problem. Otherwise, it is hard to know what is going on or how to address it.

NEW! This item is a game information page
It belongs to categories: Orthodox chess, 
It was last modified on: 2019-06-24
 By LUCIO JOSE  PATROCINIO FILHO. Turnover. Three ring sizes fit into each other, combining and splitting into different pieces, sometimes taking over your opponent's.[All Comments] [Add Comment or Rating]

You can play Turnover at google drive.

If you wish, I can create there a folder to you with a board game presentation where you may invite friends to play.

It is like game courier, but without programming. 

Just need move piece and duplicate the slide. Duplicate a slide means pass your turn.

So you may duplicate the file and change its name to play with other players, inviting him by sharing the file with him. Just need share it with gmail accounts and setup permission to write.

Check it up! Link

Send me an email if you want more information about how it works.


This item is a game information page
It belongs to categories: Orthodox chess, 
It was last modified on: 2000-06-23
 Author: Hans L. Bodlaender. Rules of Chess. This is how modern chess was originally referred to in the late 15th century. (8x8, Cells: 64) (Recognized!)[All Comments] [Add Comment or Rating]
Kevin Pacey wrote on 2019-07-22 UTC

Hi H.G.:

Chess Assistant16 doesn't provide the engine that it used for evaluations, regrettably. However I experimented in another way (though not as you would prefer), using Houdini3 (released 2012) as an engine instead. In the exact position in the line culminating with 9.Qc2-c3 that I gave, after some considerable time to look, Houdini3 evaluates the position as 0.15 (or "+=/="), somewhat better than the 0.04 of CA16's engine (as an aside, a disbelieving master friend dared me to play this line as Black against him in any tournament, back in the 1980s, and gallingly I lost the one time I obliged - in spite of previously winning a number of nice master-level games with it, at least sometimes attacking with queens on the board).

I tried replacing the B on c1 with a White knight (a fairly lousy square for a Kt), and this time Houdini3 gave the position as -0.12 (or "=") after considerable time spent. I then tried looking at the same position but with the White knight on d2 (not a great square completely for a knight, either, but it allows White to develop at least a move faster, probably); in this case Houdini3 rated the position as exactly 0.00 (or "="). Note: replacing the Kt on d2 with a dark-squared White bishop gives a position Houdini3 evaluated as 0.17 (or "+=/="); White can formally develop all his pieces a move faster (probably), but he'll want to eventually improve the lot of that piece (White B) now on d2 - though that seems true if a White Kt were there, too.

It may be worth noting that CA16's engine rates the Nimzo-Indian Defence (position after 3...Bf8-b4) as worth 0.07 (or "+=/=") for White, while Houdini3 gives it as 0.16 (or "+=/=") for White. CA16 considers the Nimzo-Indian complex of defences as numerically Black's best defence to 1.Pd2-d4 (i.e. with 'best' play).

H. G. Muller wrote on 2019-07-21 UTC

Piece values are an average over all plausible positions anyway, furthermore based on the assumption that the value of an army is the sum of its parts. (Although the B-pair bonus strictly speaking already is an exception to that). So it is to be expected that in individual positions the performance is not as good as the standard value suggests. E.g. the value of a Bishop is commonly considered to be dependent on the shade the Pawns are on. And a Queen is more valuable when the opponent has poor King safety, so you can effectively double-move it via intermediate checks.

What you show here is not evidence of that, however. That there is no obvious compensation doesn't mean there is no compensation. Apart from the Bishop-Knight imbalance, the position is quite asymmetric. So the absolute value of the position cannot really be attributed to material only. A better test would be to replace one of the white Bishops by a Knight, and then look how much the position scores on average. If white is then significantly worse you know it cannot be due to material, as that is perfectly balanced.

Kevin Pacey wrote on 2019-07-20 UTC

On computer chess (or even human) piece valuations, a 'controversial variation of the Nimzo-Indian Defence' (according to Dutch Grandmaster Jan Timman in The Art of Chess Analysis, circa 1980, referring to 5...Nf6-e4 below) that I (as a master-level player) have liked to play as Black over the years just might illustrate an exception to giving a very significant bishop-pair bonus on an 8x8 board to the side possessing it, even when there appears to be no clear reason to make the exception.

The variation in question goes 1.Pd2-d4 Ng6-f6 2.Pc2-c4 Pe7-e6 3.Nb1-c3 Bf8-b4 4.Pe2-e3 Pb7-b6 5.Ng1-e2 Nf6-e4 6.Qd1-c2 Bc8-b7 7.Pa2-a3 Bb4-c3(ch) 8.Ne2-c3 Ne4-c3 9.Qc2-c3 (see diagram below; note that nowadays in my games, some players prefer to give Black the bishop pair instead, by playing 6.Bc1-d2[!] - in either case there are some tiny factors going on in favour of either side, but these are not so easy to articulate, at least in a few words, even for master-level players; also note my 2008 book Encyclopedia of Chess Openings volume E, 4th edition gives the line as definitely slightly better for White ["+="] in either case, but my more modern chess database's human evaulation [i.e. that of 2015's Chess Assistant16] gives White only its usual symbolic edge ["+=/="] as in its more mainline openings' variations, also with the CA16 engine's evaluation as only 0.04 pawns in White's favour, in either case):

NEW! This item is a game information page
It belongs to categories: Orthodox chess, 
It was last modified on: 2019-07-20
 By Prussia  General. Hidden Random Chess. This is a two-player game that incorporates the element of chance in chess.[All Comments] [Add Comment or Rating]
Greg Strong wrote on 2019-07-20 UTC

Updated and posted.  Nice submission :)

Greg Strong wrote on 2019-07-19 UTC

I like this.  I think it's a good name and I can find no evidence of it being used before.  I'll change the name later this evening.

Prussia General wrote on 2019-07-19 UTC

Name: What about "Hidden Random Chess", a name inspired from Fischer Random Chess. 

Uploading image: Thanks to Ben's hints, I now have the image uploaded. 

This item is a computer program
It belongs to categories: Orthodox chess, 
It was last modified on: 2014-05-17
 Author: Michel  Gutierrez. Jocly. An html-based web platform for playing 2-player abstract stategy games.[All Comments] [Add Comment or Rating]
erik wrote on 2019-07-19 UTC

The Jocly Apps are actually still available on the Apple App Store (but not on the Google Play Store). Of course connection to the server isn't possible anymore, but the IA works. The name of the developper has changed; I suppose that Michel Gutierrez is still maintaining them?

This item is a play-by-email page
It belongs to categories: Orthodox chess, 
It was last modified on: 2004-12-09
 Author: Antoine  Fourrière. Chu Shogi. Shogi variant on 12 by 12 board.[All Comments] [Add Comment or Rating]
dax00 wrote on 2019-07-19 UTC

The rules given below the board during game play are incorrect, which may mislead players who don't bother to find the actual rules. Two links to rules pages can be found: 1) , which has mistakes and is more readily accessible; and 2) , which is correct but not easily found. Namely, the mistakes concern Lion capture and promotions.

[Correct rules] If a player's lion is captured by a non-lion, he cannot on the next move capture a lion with a non-lion on another square (i.e. you can always immediately capture a kirin that promotes while capturing your lion). An unpromoted piece may promote when entering the promotion zone, or when making a capture beginning its move in the promotion zone. A pawn left unpromoted gets a second chance to promote on the 12th rank but is not obligated to do so.

NEW! This item is a game information page
It belongs to categories: Orthodox chess, 
It was last modified on: 2019-07-20
 By Prussia  General. Hidden Random Chess. This is a two-player game that incorporates the element of chance in chess.[All Comments] [Add Comment or Rating]
Ben Reiniger wrote on 2019-07-19 UTC


1) We (an editor) will need to change the name; let us know when you're settled on one.  (Also, to me, Undercover seems like the player should know their own pieces' identities.  "Reveal" or something, but that suffers the same problem and hints at existing Revelation.  Hmm.)

2) You should be able to upload images from your computer using the "upload files" link just after the bottom of the game description -- the part that begins with the 'm' icon and "This 'user submitted' page ...".  The editing links for you (including the image upload) will only display when you are logged in.  If you want to use the diagram designer, there should be some suitable modified-pawn images that would work, or maybe using the dotted modifier recently described there.  (A black dot over pieces that are technically unknown to the players, but which you want to show the reader?)

I also wanted to mention that this reminds me a little of V.R. Parton's Identific Chess (here currently only as a Friedlander applet; I'll have to write an article later), which led me also to David Howe's Potential Chess.

Prussia General wrote on 2019-07-19 UTC

Thanks for the input - now I just need some solutions. 

1) How do I go by edit the name of the mod? 

2) How do I upload my own images? All options so far require an external link. The diagram designer doesn't show that the e2 pawn is different from other units on the 2nd row. I have my own image ready but no way to upload it onto the website. 

Fergus Duniho wrote on 2019-07-18 UTC

The setup section says "See illustration," but there is no illustration. One would be helpful to have. Also, the setup says nothing about the board. I'm presuming it's the usual 8x8 Chess board, but it would be helpful to mention this explicitly.

The name Disc Chess brings to mind Terry Pratchett's Discworld and suggests to me a game played on a circular board. Also, it's not the only game with disc shaped pieces. Chinese Chess is also played with disc-shaped pieces. I agree with Ben that a name reflecting the hidden information aspect of this game would be most appropriate. Something like Undercover Chess might work.

Prussia General wrote on 2019-07-16 UTC

Is the name disc chess taken yet? Also how do I revise the name? It doesn't seem to let me. 

This item is a game information page
It belongs to categories: Orthodox chess, 
It was last modified on: 2001-10-20
 Author: Bruce  Balden and Hans L. Bodlaender. Inventor: Dr. Ferdinand  Maack. Raumschach. The classical variant of three-dimensional chess: 5 by 5 by 5. (5x5x5, Cells: 125) (Recognized!)[All Comments] [Add Comment or Rating]
Ben Reiniger wrote on 2019-07-15 UTC

@Kelvin, I think these are equivalent, because of the current text's requirement "always in the same coordinate plane," or from the later "never step through the corner of a cell."

Also equivalent, I think, is the one-orthogonal one-diagonal-outward if this page treated the unicorn's "triagonal" as non-diagonal.  I think maybe the easiest description would be "like a knight in any of the coordinate planes," but that's probably pretty subjective.

If you disagree with any of these equivalences, could you point out an example move that one has that the other doesn't?

KelvinFox wrote on 2019-07-15 UTC

The description for the knight is incorrect. It should read that the knight moves tw squares in one rook wise direction and 1 in another. The piece's current description, while making the same piece as the first one on 2d boards, gives a different piece on 3d boards

NEW! This item is a game information page
It belongs to categories: Orthodox chess, 
It was last modified on: 2019-07-20
 By Prussia  General. Hidden Random Chess. This is a two-player game that incorporates the element of chance in chess.[All Comments] [Add Comment or Rating]
Greg Strong wrote on 2019-07-13 UTC

Ah, I see, the page contents don't show up if I'm not logged in ...

Ben Reiniger wrote on 2019-07-13 UTC

The contents are here, just hidden pending editorial review.  But Greg's point does stand that this should have a different name to differentiate it from the existing Flip Chess.  Maybe something that indicates the hidden information aspect?

Greg Strong wrote on 2019-07-13 UTC

There is nothing on this page.  Are you referring to this game?

Prussia General wrote on 2019-07-13 UTCExcellent ★★★★★

Just played this very interesting game. A single Knight won the game when White was at a larrge disadvantage being down a bishop and a rook. 

(note b2=P means b2 is flipped and a Pawn is revealed. Pawns are desginated P and there is no short-form notation)

1. c2=P   c7=C
2. Pe2-e3   ....

Otherwise Cc7xc1 #

2. ...       Cc7xc1 (xB)
3. Ke1-e2 Cc1xa1 (xP)
4. g2=N    b7=B
5. Ng2-f4  Bb7xh1 (xR)
6. Nf4-e6

After a careless capture at h1, which yielded a rook advantage (rook is the strongest unit on board at the start), Black resigns at this point, since Nxg7 or Nc7 are both checkmates and no possible move could defend both squares. The King could not move as its only revealed piece, the e7 pawn, is blocked by the white Knight. Other unrevealed p

This item is a piececlopedia entry
It belongs to categories: Orthodox chess, 
It was last modified on: 2001-04-17
 By Peter  Aronson. Rhino. A set of pieces which combine the movements of the Mao with that of the Wazir.[All Comments] [Add Comment or Rating]
H. G. Muller wrote on 2019-07-10 UTC

Note that it must be trivially easy to checkmate a bare King with a Rhino, powerful as the latter is, in addition to covering two orthogonally adjacent squares. The checkmating applet cannot really do crooked sliders, but assuming that blocking doesn't play a significant role with only another King on the board, you can let it calculate a piece that directly leaps to the squares a Rhino would attack.

As is well known, the Gnu/Wildebeest, whose targets all fall on the Rhino paths, has no mating potential. This is due to a coincidental collision with the King. But just adding a single W move to the Gnu (say fW) already cricumvents this problem. So WNC, which is a subset of the Rhino (but leaping) already has an easy mate (maximally 19 moves).

The Mirror Rhino fares even better, as FN in itself has already mating potential (maximally 22 moves). The longer distance moves of the Rhino were only needed because without them no two orthogonally adjacent squares would be attacked.

KelvinFox wrote on 2019-07-10 UTC

@Aurelian Florea 

This is a Rhino where all Wazir movements are crooked compared to the previous one

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