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Questions tagged [chess-variants]

Questions about variants of normal chess including bughouse, Chess960 (Fischer Random), atomic chess, racing kings, crazyhouse, antichess, etc. Can be used together with a more specific chess-variant tag, like [chess-960], [bughouse], etc. (see tag wiki for suggestions).

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7 votes
2 answers
1k views

Chess Variant Idea: Every piece can move on each turn

Imagine a chess variant where you could make 1 move for each of your pieces on the board during your turn. There is no mate in one on the first move so far as I can see. Also, things that would ...
5 votes
2 answers
12k views

Where can I play this 2v2 chess variant online?

There is this chess variant in India and we call it 'Supply'. Its a 2 vs 2 game with 2 boards and 2 players of a team take alternate colors. The standard rules of chess apply, but with one twist. If ...
25 votes
3 answers
5k views

Chess960 or Chess959?

Once in 960 times, Chess960 should just be the same as regular chess. Are there any known instances of this? Or is this selection automatically excluded, after which they just roll the dice again? So ...
0 votes
2 answers
382 views

How does FIDE define slow rapid & fast rapid?

Note: This has practical implications if that's what you were wondering about. How can Hikaru in 2022 WFRCC be a successor of Wesley in 2019 WFRCC if 32.5min & 60min aren't in the same time ...
2 votes
2 answers
2k views

Where can I get a free engine to play Hexagonal Chess?

This question asks about the rules for Glinski's hexagonal chess. If I want to play a game of Glinski's hexagonal chess against the computer where can I get a free downloadable engine?
3 votes
2 answers
182 views

Are there chess variants than involve only cooperation and no competition?

One thing I've noticed is that even the most unusual chess variants tend to involve some sort of a competition. For instance in 4 player chess teams the members of the same team cooperate with each ...
3 votes
1 answer
153 views

On a toroidal board, which pieces are needed to checkmate?

I saw this question On an infinite board, which pieces are needed to checkmate? and was inspired by it. Many mating combinations won't suffice on a toroidal board. For example, queen vs king will be a ...
10 votes
1 answer
222 views

What sites have different ratings for different time controls for Chess960?

Both lichess and chess.com and have ratings for live chess960, but this is regardless of time control. Please recommend a site that has separate ratings for different time controls for chess960. There ...
1 vote
4 answers
1k views

How do convert/parse/extract data from a PGN into a spreadsheet/google sheet/excel file?

Sequel to this question: Live statistics chess960 from chess.com? So suppose I go to like https://api.chess.com/pub/player/gmwso/games/2020/12 or https://api.chess.com/pub/player/gmwso/games/2020/12/...
4 votes
2 answers
206 views

Longest *fairy* chess problem

Longest orthodox chess problem One for the specialists. In the newest SCHWALBE I saw some titanic lengths (one problem had 2^59+2^57+3 ~ 10^18 moves!) As you see, this scales with O(2^(n^2)), where n ...
1 vote
1 answer
126 views

Material value of the super-king

In standard chess, everyone knows that the king is the weakest piece, being able to move one square in any direction (diagram below), with its movement often hindered by enemy pieces and even friendly ...
4 votes
1 answer
125 views

What are the Rules of Baroque chess?

I want to do an AI project implementing a Chess agent, so can anyone please let me know the Rules of Baroque chess?
4 votes
1 answer
719 views

When was the last time Magnus Carlsen lost 2 classical games in a row to the same player besides to Wesley So?

Related questions: When was the last time Magnus Carlsen lost 3 classical games in a row besides to Wesley So? When was the last time Magnus Carlsen lost 2 classical games in a row to the same ...
2 votes
0 answers
97 views

Why does a hexagonal chess board skip the letter J?

For every Glinski's Hexagonal Chess game I see online the algebraic notation skips J for I K L. Why? What's wrong with J?
1 vote
2 answers
232 views

Does this chess variant exist, and has it ever been considered for official tournaments?

Inspired by this question: Why did Magnus Carlsen not play the World Chess Championship in 2023? It's not the first time I've heard about GMs (not just Magnus Carlsen) being tired of the current state ...
3 votes
2 answers
145 views

Max number of promoted units on the board in a monochromatic game

A whimsical question just occurred to me. I think I have an answer, but I thought I would share it here as a puzzle. What is the maximum number of promoted units that can appear simultaneously on the ...
4 votes
2 answers
798 views

What is the best way to improve Crazyhouse or Bughouse skills?

I have been playing Chess variants for a while now, and I would like to know how to improve my skills in bughouse and crazyhouse. Does anyone have any tips or strategies that would apply to either? ...
6 votes
2 answers
1k views

What are "monochromatic" retrograde analysis problems?

What does it mean when a retrograde analysis problem is qualified as being "monochromatic" ?
1 vote
1 answer
294 views

How much is the value of the wizard?

I came up with a new chess piece called the "Wizard".What it does basically is that it can switch places with any piece(except pawns) and for 1 move it has the attributes of the switched ...
1 vote
1 answer
121 views

Chess960 castling controversies in the 2019 vs 2022 WFRCC, where both are Nepo vs Wesley So

Why did Ian Nepomniachtchi get a replay for the castling issue in the 2019 WFRCC vs Wesley So, but Wesley So didn't get a replay for the castling issue in the 2022 WFRCC vs Nepo? I mean I know the ...
8 votes
3 answers
8k views

Bughouse chess strategies

Are there any nice strategies for Bughouse? I wish for advice on opening and how to win. I have not found anything good on the web.
3 votes
0 answers
83 views

Baroque/Ultima vs. Chess

Baroque a.k.a. Ultima is a chess variant in which all the pieces except the kings have quite different powers than in regulation chess. They all make non-capturing moves like queens (except the "...
1 vote
1 answer
180 views

Viability of 4 player chess engines

I got into a discussion with a friend recently about the viability of 4 player chess engines. He claimed that they would be impossible to create at anywhere near the level of modern chess engines. I'm ...
0 votes
0 answers
126 views

How bad is Stockfish in Fog of War chess

Since in Fog of War chess you cant see all the board , I think that engines would suck at it.Have there been any attempts on playing engine tournaments under Fog of War chess?
3 votes
1 answer
119 views

Chess Atomic Openings

I'm studying Atomic Chess. Where can I find openings at? I've found the site Vlasov's Atomic-Chess Homepage so far.
18 votes
6 answers
4k views

Can one side force a loss in regular chess?

Chess is unsolved, so there is no known optimal strategy for one side to force a win or a draw. However, is there an optimal strategy to lose? Consider a variant where checkmate results in a loss, ...
27 votes
3 answers
24k views

What are the rules of Quantum Chess?

The game Quantum Chess, as seen in the video where Paul Rudd defeats Hawking, has no "set of rules" written down. You either have to do the in-game tutorial, watch a video on the game and pick them up....
14 votes
1 answer
6k views

Why can't I move my knight from d5 to c7?

I am a foreigner learning to play chess with my computer. The blue move is the last move and the red one is suggested to go. I wonder why I can't move my knight anymore. The computer doesn't allow me ...
8 votes
3 answers
488 views

Who has the edge in "gg chess"?

EDIT: I think a better name is gg chess, because "gg" (good game) is what folks frequently say at the end of a game. At major chess events, at the end of a drawn game, the players & ...
14 votes
1 answer
3k views

Checkmate in ω² moves with finitely many pieces

The post Checkmate in ω moves? has inspired a lot of discussion and mathematical research into positions on an infinite chessboard where white can mate in a transfinite amount of moves. The current ...
10 votes
4 answers
4k views

How to calculate the number of combinations for Chess960 positions

Can someone derive how do we get the total number of 960 possible positions for Chess960?
7 votes
0 answers
237 views

How much would chess change if Black always had the last move?

In a hypothetical minor variant, could White's first-move advantage be compensated for by Black's right to last move? Normally, White wins have White play N+1 plies to Black's N. How would the game ...
5 votes
3 answers
2k views

Where can I find mobile software for Fischer random chess?

Fischer had a chess variation (chess960) but I cannot find any mobile app to play it. Does anyone knows where I can get the best software (if possible free or cheap) to play it?
4 votes
1 answer
313 views

What's the point of attack board inversion?

In tri-dimensional chess some rule sets allow for the attack board to be moved from the peg on top of the main board to the peg on the underside (as long as the attack board is unoccupied). What is ...
4 votes
2 answers
213 views

What is the idea behind 1. nh3 h6 in atomic chess?

On the Lichess analysis board for atomic chess, it suggests for white to play 1. nh3, an unorthodox move that seems to leave the knight in a terrible spot on the side. But even more bizarrely, the ...
4 votes
2 answers
198 views

When is K vs K+R in antichess winning? How to win these endgames?

Note: This is not a question on standard chess, where obviously K+R vs K is a win for K+R. Here are two example K+R vs K positions in antichess, both having white to play and white having K+R. ...
1 vote
2 answers
218 views

What are the pros and cons of introducing chess 960 without castling as a new chess variant?

Chess 960 is a popular chess variant that can be played on many platforms. All rules are standard, except the starting position is randomly generated. Some of these 960 positions give more than usual ...
5 votes
13 answers
2k views

Chess-like games and exercises that are useful for chess coaching

Chess 960 popularised by Fischer could be useful to teach opening principles (mainly because the players has to think about development consciously). LaPingvino asked "What other games or chess ...
2 votes
1 answer
211 views

How to ask an AI engine to test this chess variant?

I would like to use an AI engine to test how well the following chess variant would work: The rules are as in usual chess, except Castling is not possible; instead, the next rule takes its place: ...
14 votes
2 answers
1k views

What is Indian Castling exactly?

Western castling doesn’t exist in historical Indian Chess (Chaturanga). Instead, in some versions, there is a cool move whereby each king can once in the game make a knight's move. I read that it is ...
1 vote
0 answers
70 views

Record stockfish level 8 in atomic?

What is the shortest possible game against Stockfish at its hardest setting in Atomic Chess? You cannot allow the computer to blunder the game on move 1 or 2, otherwise the shortest possible game is 3 ...
7 votes
4 answers
965 views

Variation of chess where winner has to capture all pieces?

Is there any variation of chess where the winner has to take all of the opponents pieces rather than just force the capture of one of them ? I guess sacrifices wouldn't work well in this variation of ...
0 votes
0 answers
37 views

Is there a crazyhouse+bughouse chess variant?

I would like to know if the following chess variant or a closely related one exists. There are 4 players, say 1 to 4. Players 1 and 2 form a team and play aginst players 3 & 4 team. Player 1 plays ...
8 votes
2 answers
580 views

How to propose a new game variant?

My daughter and I have devised a chess variant which we feel works very well: it preserves the basic moves and strategies of chess, yet adds new strategies and considerations. It is a form of "3-D ...
7 votes
3 answers
952 views

Phone apps for playing chess variants

A group of local friends and I have become fairly engrossed in playing a certain chess variant over the last few years. We play on a regular basis; we've coded a program that allows us to play online, ...
1 vote
0 answers
56 views

How to gain a better understanding/intuition in queen races?

In antichess, queen races are when both players have their queens on opposite sides of the board, continually capturing each other's pieces. In my experience playing antichess, queen races are very ...
3 votes
1 answer
257 views

Mate-in-N problems where N scales indefinitely with board size

Motivation - Long range mating patterns This question is inspired by my recent interest in infinite chess and the post on MathOverflow Checkmate in ω moves?. Since my chess endgame skills are quite ...
14 votes
2 answers
747 views

If repetition loses, who wins KvK?

Suppose we're playing a version of chess where you lose if you repeat once an earlier position (position = arrangement of pieces + who's move it is). We're down to the wire, and we've just arrived at ...
12 votes
4 answers
462 views

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 ...
15 votes
4 answers
29k views

What are the best openings in Antichess?

I am experiencing Antichess and it's more forcing than normal chess. What are the best openings for white ? Is there any winning opening whatever the black does respond? Antichess, according to ...

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