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Suspicious Spies. An army where some pieces cannot be captured until it has captured a piece. (8x8, Cells: 64) [All Comments] [Add Comment or Rating]
🔔Notification on Mon, Aug 26, 2024 03:58 AM UTC:

The author, HaruN Y, has updated this page.


Camelopard Chess. Game with Camelopards. (12x12, Cells: 144) [All Comments] [Add Comment or Rating]
🔔Notification on Mon, Aug 26, 2024 04:42 PM UTC:

The author, HaruN Y, has updated this page.


Gwangsanghui(광상희). Members-Only A large, historical variant of Janggi, with two more generals that lead each flank and 6 more kinds of pieces.[All Comments] [Add Comment or Rating]

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Great Bird Chess. Members-Only Missing description (8x8, Cells: 64) [All Comments] [Add Comment or Rating]

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Fuller's Proposal. Bishops can also move and capture as knights.[All Comments] [Add Comment or Rating]
HaruN Y wrote on Thu, Aug 29, 2024 01:50 PM UTC:

Fuller's Proposal1320

files=8 ranks=8 promoZone=1 promoChoice=QA graphicsDir=/cgi-bin/fen2.php?s=50&t=&w=72818d&b=d81827&p= squareSize=50 graphicsType= symmetry=mirror royal=K borders=0 firstRank=1 lightShade=#5ceb6e coordColor=#d4d9dd darkShade=#425767 rimColor=#142e42 shuffle=NARQK pawn:P:ifmnDfmWfceF:pawn:a2,b2,c2,d2,e2,f2,g2,h2,,a7,b7,c7,d7,e7,f7,g7,h7 knight:N:N:knight:b1,g1,,b8,g8 rook:R:R:rook:a1,h1,,a8,h8 queen:Q:Q:queen:d1,,d8 archbishop:A:BN:cardinal:c1,f1,,c8,f8 king:K:KisO2:king:e1,,e8

Great Bird Chess. Members-Only Missing description (8x8, Cells: 64) [All Comments] [Add Comment or Rating]

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Bughouse Spartan Chess. streetmansd. (2x(8x8), Cells: 128) [All Comments] [Add Comment or Rating]
NeodymiumPhyte wrote on Thu, Aug 29, 2024 05:36 PM UTC:

If black has 1 Persian King and 1 Spartan King, is there duple-check for them?


H. G. Muller wrote on Thu, Aug 29, 2024 06:28 PM UTC in reply to NeodymiumPhyte from 05:36 PM:

Since Spartan Kings behave as if they are promoted Hoplites, and thus demote on capture, this situation would require promoting a passed Hoplite. The rule description does not specify whether this is allowed. In Spartan Chess there is a restriction on when you can promote to King, and it is not obvious how this rule should be extended to the case where Hoplites fight in an army headed by a Persian King. One possible extention would be that a Persian King already counts as a pair in itself, and that its presence thus suppresses the King option on promotion. Then the situation could never occur.


Tengu Dai Shogi. Turbo version of Dai Shogi, with some Dai Dai Shogi pieces.[All Comments] [Add Comment or Rating]
🔔Notification on Fri, Aug 30, 2024 04:46 AM UTC:

The editor A. M. DeWitt has revised this page.


Chu Shogi. Historic Japanese favorite, featuring a multi-capturing Lion.[All Comments] [Add Comment or Rating]
🔔Notification on Sat, Aug 31, 2024 11:42 PM UTC:

The author, A. M. DeWitt, has updated this page.


TessChess. 4D chess featuring symmetrically-moving pieces. (4x(4x(4x4)), Cells: 256) [All Comments] [Add Comment or Rating]
💡📝Ben Reiniger wrote on Sun, Sep 1, 2024 06:32 PM UTC in reply to Ben Reiniger from Sun Aug 25 03:38 PM:

@HGMuller

The first problem to solve is that the square coloring doesn't alternate properly. If there's a way to set colors more manually, I'll do that. I think the coloring is important to see the bishop bindings and rook's alternation, so I'm not willing to just leave it as is. I can't put just one hole between little boards, or the knights will be afforded an incorrect move. I could put three holes between little boards, but that'll have quite a bit too much empty space (can you thin specific ranks+columns?).

Skimming the documentation page for the interactive diagram, I think I can do this, but just by creating a background image and setting the background parameter (keeping two spaces between boards)? That's a little obnoxious, and something like Game Courier's method for specifying custom coloring patterns would be nice, but also not a big deal.

Ideally I could override the coordinates

This doesn't seem possible besides setting a starting rank number, but I can suppress coordinates altogether. A new parameter with comma-separated rank/file names would be really nice.


Featured Chess Variants. Chess Variants Featured in our Page Headers.[All Comments] [Add Comment or Rating]
Diceroller is Fire wrote on Sun, Sep 1, 2024 08:05 PM UTC:

New month started………


🕸📝Fergus Duniho wrote on Mon, Sep 2, 2024 01:48 AM UTC:

Anyone care to nominate or second a game?


TessChess. 4D chess featuring symmetrically-moving pieces. (4x(4x(4x4)), Cells: 256) [All Comments] [Add Comment or Rating]
H. G. Muller wrote on Mon, Sep 2, 2024 06:00 AM UTC in reply to Ben Reiniger from Sun Sep 1 06:32 PM:

You can embed a JavaScript function xxxShade(x,y) on the page, which returns a color (like '#ffc080'). (Where xxx is the value of the satellite parameter.) Which will then be used for the square with internal coordinates (x,y). (Where the lower-left corner is (0,0).)

The problem with coordinates is that these are not just for dressing up the image, but are used in notation. By allowing arbitrary coordinate labels it would be possible to define coordinates for which SAN can no longer be unambiguously parsed.


@ Mirko Mirko[All Comments] [Add Comment or Rating]
Mirko Mirko wrote on Mon, Sep 2, 2024 01:00 PM UTC:

Army of tencubed

files=10 ranks=10 promoZone=1 promoChoice=NBRQACCW graphicsDir=/graphics.dir/alfaeriePNG/ squareSize=50 graphicsType=png symmetry=none royal=K pawn:P:ifmnDfmWfceF:pawn:a3,b3,c3,d3,e3,f3,g3,h3,i3,j3,,a8,b8,c8,d8,e8,f8,g8,h8,i8,j8 knight:N:N:knight:c2,h2 bishop:B:B:bishop:d2,g2 rook:R:R:rook:b2,i2 queen:Q:Q:queen:e2 archbishop:A:BN:cardinal:,,e10 chancellor:C:RN:chancellor:,,f10 champion:C:WAD:champion:,,c10,h10 wizard:W:FC:moon:,,d10,g10 king:K:KisO3:king:f2,,f9

Random Army of tencubed

files=10 ranks=10 promoZone=1 promoChoice=NBRQACCW shuffle=NBRQACCWK graphicsDir=/graphics.dir/alfaeriePNG/ squareSize=50 graphicsType=png symmetry=none royal=K pawn:P:ifmnDfmWfceF:pawn:a3,b3,c3,d3,e3,f3,g3,h3,i3,j3,,a8,b8,c8,d8,e8,f8,g8,h8,i8,j8 knight:N:N:knight:c2,h2 bishop:B:B:bishop:d2,g2 rook:R:R:rook:b2,i2 queen:Q:Q:queen:e2 archbishop:A:BN:cardinal:,,e10 chancellor:C:RN:chancellor:,,f10 champion:C:WAD:champion:,,c10,h10 wizard:W:FC:moon:,,d10,g10 king:K:KisO3:king:f2,,f9

Featured Chess Variants. Chess Variants Featured in our Page Headers.[All Comments] [Add Comment or Rating]
Lev Grigoriev wrote on Mon, Sep 2, 2024 01:44 PM UTC in reply to Fergus Duniho from 01:48 AM:

I second Atomic Chess.


@ H. G. Muller[All Comments] [Add Comment or Rating]
A. M. DeWitt wrote on Mon, Sep 2, 2024 03:13 PM UTC:

@H. G. Muller,

I am making a new chess variant, Reiwa Dai Shogi, that is basically Dai Shogi with better piece balancing, replacing the weak pieces with stronger ones with stronger promotions.

However, I am struggling to make a good power piece for the game. Ideally, I want something that is stronger than the Lion but still has difficulty mating.

I figured it would be a good idea to have you weigh in on this, since you know a fair deal about Chu Shogi and the historical variants.

Here's a diagram of my first in-dev version. Lion is currently subject to trading rules due to lack of a stronger power piece ATM. The only new pieces are the Ram's-Head Soldiers on c1 and m1.

files=15 ranks=15 promoOffset=22 promoZone=5 maxPromote=19 promoChoice=+ royal=100 protected=21 counterStrike=21 protected=32 counterStrike=32 tradeThreshold=2 royal=22 royal=30 stalemate=win graphicsDir=/membergraphics/MSdaishogi/ whitePrefix=w blackPrefix=b lightShade=#ffe682 darkShade=#ffe682 graphicsType=png?nocache=true squareSize=36 symmetry=rotate firstRank=1 newClick=1 Pawn:P:fW:p:a5-o5 morph=| Go Between:I:vW:go:e6,k6 Copper General:C:vWfF:c:e1,k1 Silver General:S:FfW:s:f1,j1 Gold General:G:WfF:g:g1,i1 Ferocious Leopard:F:FvW:fl:d1,l1 Blind Tiger:T:FsbW:bt:g2,i2 Drunk Elephant:E:FfsW:de:h2 Phoenix:X:WA:ph:i3 Kirin:O:FD:kn:g3 Lance:L:fR:l:a1,o1 Ram's-Head Soldier:RS:fB:fst:c1,m1 Reverse Chariot:A:vR:rv:a2,o2 Side Mover:M:sRvW:sm:b4,n4 Vertical Mover:V:vRsW:vm:c4,m4 Bishop:B:B:b:d3,l3 Rook:R:R:r:d4,l4 Dragon Horse:H:BW:dh:e4,k4 Dragon King:D:RF:dk:f4,j4 Queen:Q:Q:q:i4 Lion:N:KNScaKmcabK:ln:g4 King:K:K:k:h1 Tokin:+P:WfF:g2: Drunk Elephant:+I:FfsW:de2: Side Mover:+C:sRvW:sm2: Vertical Mover:+S:vRsW:vm2: Rook:+G:R:r2: Bishop:+F:B:b2: Flying Stag:+T:vRsWF:fs2: Prince:+E:K:k: Queen:+X:Q:q2: Lion:+O:KNScaKmcabK:ln2: counterStrike=21 White Horse:+L:vRfB:wh2: Free Wolf:+RS:sRfBbW:fw: Whale:+A:vRbB:wl2: Free Boar:+M:BsR:fb2: Flying Ox:+V:BvR:fo2: Dragon Horse:+B:BW:dh2: Dragon King:+R:RF:dk2: Horned Falcon:+H:BbsRfWfDfcavWfabW:hf2: Soaring Eagle:+D:RbBfFfAfcavFfabF:se2:

@ François Houdebert[All Comments] [Add Comment or Rating]
A. M. DeWitt wrote on Mon, Sep 2, 2024 05:14 PM UTC:

Francois,

Sorry for not responding to your email with the chess icons earlier. It was in my spam folder.

These images are really good. Seriously, great work with your SVGs.

I did find one flaw in your mnemonic SVGs though. The ranging pieces don't have the radial lines where their ranging bulges are, which isn't a huge deal, but can cause confusion if you are used to H. G. Muller's mnemonic system for Shogi pieces. This problem is much more pronounced with the bfree-tiger and heavenly-horse SVGs though, where no white lines will show up at all, making the piece just look like one big mass of black. My guess is that the program you are using couldn't perceive the white lines due to them being at a pixel wide or less.

I used Tinkercad (https://www.tinkercad.com/) to create my Chu Shogi SVGs. Tinkercad is a free online 3D tool that has an Export to SVG tool which works on all Shapes intersecting the Design Plane. It can be a bit tedious when you need to make a lot of SVGs but can save a lot of time and result in high quality SVGs.

Other than that, great work with these.


Featured Chess Variants. Chess Variants Featured in our Page Headers.[All Comments] [Add Comment or Rating]
Daniel Zacharias wrote on Mon, Sep 2, 2024 06:09 PM UTC in reply to Fergus Duniho from 01:48 AM:

Duke of Rutland's Chess


@ Mirko Mirko[All Comments] [Add Comment or Rating]
Mirko Mirko wrote on Tue, Sep 3, 2024 11:51 AM UTC:

Dropped Shinobi

files=8 ranks=8 promoZone=1 promoChoice=NBRQAFGLHHD graphicsDir=/graphics.dir/alfaeriePNG/ squareSize=50 graphicsType=png symmetry=none royal=K pawn:P:ifmnDfmWfceF:pawn:a2,b2,c2,d2,e2,f2,g2,h2,,a7,b7,c7,d7,e7,f7,g7,h7 knight:N:N:knight:b1,g1 bishop:B:B:bishop:c1,f1 rook:R:R:rook:a1,h1 queen:Q:Q:queen:d1 archbishop:A:BN:cardinal:,,d8 ferz:F:F:ferz:,,c8 guard:G:WF:guard:,,f8 lance:L:fR:lance:,,g8 horse:H:ffN:horse:,,b8 dragon horse:H:BW:promotedbishop:,,h8 dragon king:D:RF:promotedrook:,,a8 king:K:KisO2:king:e1,,e8

Random Dropped Shinobi

files=8 ranks=8 promoZone=1 promoChoice=NBRQAFGLHHD shuffle=NBRQAFGLHHDK graphicsDir=/graphics.dir/alfaeriePNG/ squareSize=50 graphicsType=png symmetry=none royal=K pawn:P:ifmnDfmWfceF:pawn:a2,b2,c2,d2,e2,f2,g2,h2,,a7,b7,c7,d7,e7,f7,g7,h7 knight:N:N:knight:b1,g1 bishop:B:B:bishop:c1,f1 rook:R:R:rook:a1,h1 queen:Q:Q:queen:d1 archbishop:A:BN:cardinal:,,d8 ferz:F:F:ferz:,,c8 guard:G:WF:guard:,,f8 lance:L:fR:lance:,,g8 horse:H:ffN:horse:,,b8 dragon horse:H:BW:promotedbishop:,,h8 dragon king:D:RF:promotedrook:,,a8 king:K:KisO2:king:e1,,e8

Mirko Mirko wrote on Tue, Sep 3, 2024 04:59 PM UTC:

Ultra Tencubed

files=10 ranks=10 promoZone=1 promoChoice=NBRQACZSLCWMHDS graphicsDir=/graphics.dir/alfaeriePNG/ squareSize=50 graphicsType=png symmetry=none royal=K pawn:P:ifmnDfmWfceF:pawn:a3,b3,c3,d3,e3,f3,g3,h3,i3,j3,,a8,b8,c8,d8,e8,f8,g8,h8,i8,j8 knight:N:N:knight:c2,h2 bishop:B:B:bishop:d2,g2 rook:R:R:rook:b2,i2 queen:Q:Q:queen:e2 archbishop:A:BN:cardinal:e1 chancellor:C:RN:chancellor:f1 amazon:Z:QN:amazon:,,g9 squirrel:S:NAD:squirrel:,,h9 lion:L:KNAD:lion:,,d9 champion:C:WAD:champion:c1,h1 wizard:W:FC:moon:d1,g1 mage:M:FDAC:mage:,,c9 dragon horse:H:BW:promotedbishop:,,i9 dragon king:D:RF:promotedrook:,,b9 sun:S:RBDNA:sun:,,e9 king:K:KisO3:king:f2,,f9

TessChess. 4D chess featuring symmetrically-moving pieces. (4x(4x(4x4)), Cells: 256) [All Comments] [Add Comment or Rating]
💡📝Ben Reiniger wrote on Wed, Sep 4, 2024 02:37 AM UTC in reply to H. G. Muller from Mon Sep 2 06:00 AM:

Thanks! Colors look good, so the 2-square separation will work, and I've now entered the main "round" initial setup. Next up is adding the higher-dimensional moves! Done! Oh, and I notice that your diagram on the ID page has the Move Diagram with pieces on a non-central square: how do I do that?

satellite=tess files=22 ranks=22 promoZone=1 promoChoice=NBRQ graphicsDir=/cgi-bin/fen2.php?s=30&w=eada78&b=87adae&p= graphicsType= squareSize=30 royal=K borders=0 holeColor=#87faff useMarkers=1 darkShade=#000000 lightShade=#ffffff hole::::e1,f1,k1,l1,q1,r1,e2,f2,k2,l2,q2,r2,e3,f3,k3,l3,q3,r3,e4,f4,k4,l4,q4,r4,a5-v5,a6-v6,e7,f7,k7,l7,q7,r7,e8,f8,k8,l8,q8,r8,e9,f9,k9,l9,q9,r9,e10,f10,k10,l10,q10,r10,a11-v11 pawn:P:fmWfmHXfcFfhcLXfcDXfcAYY:pawn:b8,c8,g8-j8,m8-p8,t8,u8 knight:N:NWXDXXDXXXCXXXWXXXXZXHXYYY:knight:c1,u1 bishop:B:BDX0WXX0CX0AYY0 FYY0CYY0GYY0:bishop:g1,m1 rook:R:RHX0 NX0FXX0NYY0ZYY0:rook:b1,t1 queen:Q:RHX0 BDX0WXX0CX0AYY0 NX0FXX0NYY0ZYY0 FYY0CYY0GYY0:queen:j1 king:K:RHX BDXWXXCXAYY NXFXXNYYZYY FYYCYYGYY:king:p1

@ H. G. Muller[All Comments] [Add Comment or Rating]
H. G. Muller wrote on Wed, Sep 4, 2024 01:20 PM UTC in reply to A. M. DeWitt from Mon Sep 2 03:13 PM:

Well, I suppose that part of the reason a Lion is so valuable is that it can so easily checkmate on its own. That makes it hard to predict the value relative to pieces that cannot. The most obvious method for taking away the mating potential would be to keep the piece devoid of Knight moves.

The Lion Dog in the interpretation where it can do 2-out-1-in locust captures might be more valuable. (But I don't really like that piece, as there seems no defense against this.) The Tenjiku Free Eagle might qualify on 15x15 (where the Lion loses importance due to its slowness, and the ability to move as Queen is worth quite a lot). You could even beef it up to a 'Super Eagle' by allowing also two Wazir moves per turn (QcaWcaFcabK, possibly also adding DA). Even QcabK could be pretty strong.

It would be hard to achieve the desired value without locust captures. Perhaps with hook moves (diagonal to avoid lone mating), but Tengu Dai Shogi already exists. If you plan to allow entirely new moves, AD rifle captures could be a useful building block. Unlike the Lion's igui these can attack steppers with impunity. And unlike the Lion Dog, you can defend against the igui forks by attacking the square it is on, as all igui moves end on the same square.


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