Questions tagged [chess-variants]

Questions about variants of normal chess including bughouse, Chess960 (Fischer Random), atomic chess, racing kings, crazyhouse, antichess, etc.

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[FEN "4k3/7p/5p2/8/P2rr3/5N2/6PP/4R1K1 w - - 0 1"] [closed]

Set the alignment of a table column by placing a : on the left, right, or both sides of a separator in the separator line left center right One Two Three
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How many Chess960 positions exist in which castling on 1 side does not require moving the rook on the other side?

Update: It's chess870 (or chess869). See answer. Context/Motivation/Goal: In regular chess, you never have to move a rook (on 1 side) to castle (on the other side). My aim is to see how much of 9LX ...
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If the back row of white pieces is moved to be in front of the pawns, which side should I play?

I remember this starting position played many times by my grandfathers. But I am too young to recollect the results of their games. If I have to choose, which side should I play? (White moves 1st)
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Minimal number of moves before castling in Chess960

As you know, in the initial position Chess960 the king lies between the two rooks. Here are the rules for castling. For a starting position P, let n(P) be the minimal number of moves that White needs ...
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Winning percentage (white win/draw/black win) in chess960/9LX in 2021?

How does the winning percentage (white win/draw/black win) in chess 960 (Fischer random) compare to that of regular chess? The above was asked here: Winning percentage in chess 960. I would like to ...
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Allow piece removal

I'm wondering about a chess variant I thought of: it's just like chess except that a player may, in lieu of (or as) a move, remove any of his own pieces (except the King) from the board. (This is ...
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How big is the advantage for white in the "back-rank-game"?

Consider a chess variant in which normal chess rules apply, with one exception. The player that is able to bring a piece or a pawn onto the opponent’s back rank, which would be the 8th rank for White ...
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Other than Fairy-Max, is there a variant [fairy] chess engine that is compatible with XBoard?

Fairy-Max (which ships with the XBoard package) can play variant chess. Is there any other XBoard-compatible engine that also plays variant chess (and runs on Linux or *BSD)?
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Is there a formula that converts a number from 0 to 959 to a corresponding chess960 position?

I am looking into a website with starting positions for chess960. 000 BBQNNRKR 001 BQNBNRKR 002 BQNNRBKR 003 BQNNRKRB 004 QBBNNRKR 005 QNBBNRKR ... 959 RKRNNQBB So there is a table that converts any ...
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Is castling good in Chess960?

The overall arrangement of the pieces in Chess960 seems so weird that I have a question about it: should there be castling at all?
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The slowest Fool's Mate in Chess960

The fastest Fool's Mate in Chess960 is obviously 1. d4 g5 2. Qxg5# with any ..Q.BRKR setup, which even beats standard chess. But which is the starting position with the slowest mate? I checked a few ...
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The Chess960 analogue in shogi, xiangqi, etc

Fischer said In chess so much depends on opening theory, so the champions before the last century did not know as much as I do and other players do about opening theory. So if you just brought them ...
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Who is best at Fischer Random chess, humans or engines?

I know that the old good question about engines vs humans has been asked multiple times, e. g. here. But what about random chess (aka Fischer chess or chess960)? Can humanity feel confortable about ...
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What site/s has/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'...
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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?
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Where to download fischer random games?

Where can I download the PGN files for the World Chess 960 championship from 2019, that was won by Wesley So? I can view the games on the website e.g, https://www.frchess.com/stream but I want to ...
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Major Chess 960 tournaments?

Does anyone have any information about upcoming Chess 960 tournaments at the top level (i.e. GMs and IMs)? Even links to/information about past, major tournaments would be appreciated. I recently ...
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Why Chess960/9LX and not Chess959?

This question asks if Chess960 is really Chess960 and not Chess959, i.e. the dice are really not re-rolled (positive, instead of normative). The answer is yes, it really is. However, why is Chess960 ...
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Resources on chess variants

While posting this question, I stumbled on this list of variants from Wikipedia, which I must admit is totally awesome. I know a few online servers allow a few variants, but am not aware of places ...
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Patterns in Chess960 positions

I have two questions. Where can I find more studies like this Lichess one, please? I got it from this answer elsewhere on this site. The Lichess study is talking about this position [White "...
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In Hand and Brain chess, is the stronger player generally preferred to be the hand or the brain?

Exactly what it says on the tin, as the British say: In Hand and Brain chess, is the stronger player generally preferred to be the hand or the brain? And secondarily: Is the answer to the previous ...
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Chess variants-Anyone recall the name for one that has a "superpiece" with the movements of the queen and knight?

What is the name of the chess piece in a variant game where there is a piece that moves like the queen AND a knight? Is there a name for this variant?
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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 ...
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Name for the "folding magnetic chess set" variant?

Does anyone know the name of the chessboard variant where you fold a standard board along the line between the d-file and e-file, to get a double-sided 8x4 board? A piece on top can move past the edge ...
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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 ...
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How can I load a position without kings into an engine?

I would like to be able to do load a position into a whatever possible (advanced) engine without kings. For example, the goal of the game would be to annihilate all the possible pieces instead of ...
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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 ...
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How much material is needed to force the capture of a lone queen (for example in horde chess)?

In horde chess, the following starting position is used: [FEN "rnbqkbnr/pppppppp/8/1PP2PP1/PPPPPPPP/PPPPPPPP/PPPPPPPP/PPPPPPPP w - - 0 1"] The goal of White is to checkmate Black; the goal ...
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Is an early "normalization" of the position in Chess960 a sign of good quality game?

First let us start with two definitions. Definition #1: A position is said to be normal if there exists a sequence of legal moves from the classical starting position which lead to this position. ...
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What are the origins of Hand & Brain chess?

I was recently leafing through Pritchard's Encyclopedia of Chess Variants when I noticed that the variant Hand and Brain which has recently become popular, in which one player states the piece to the ...
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Are there any tri dimensional chess rules utilising traditional starting positions?

I have a tri dimensional chess game for my phone which let's the player select different rule sets to play by. They all start with the king and queen on the attack boards which I find incredibly ...
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Why can't a dropped pawn deliver checkmate in Shogi?

In discussion surrounding another recent question, the fact came up that a "dropped" pawn in Shogi isn't allowed to deliver immediate checkmate, whereas any other type of piece can be dropped to ...
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Would bishops be stronger or weaker on the same coloured squares?

Assuming one or both players makes a mistake and transposes a bishop and the adjacent knight when setting up the board, would this help or hinder them? The answers to this similar question suggest it'...
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Formal rules for two-player bughouse without a clock

I would like to know what are the formal rules for two-player bughouse without a clock. I'd like to think of each team as a single player. It seems to me that bughouse chess works primarily because of ...
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In the game of shogi, what is the meaning of "sabaki"?

I'm reading the book Sabaki at a glance by Madoka Kitao. It's a very nice book with many good examples one can learn from. The problem I have is that I am left with only an intuitive understanding of ...
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About the 3D chess they play on Star Trek

They play a type of 3D chess on Star Trek ( the 60's series) not on a 8x8x8 3D board but on some smaller variation. Yet the game as they have it is supposed to be complicated. Are there real rules and ...
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Is there any position where not promoting(illegally) would be the best move?

Is there any position, where moving a pawn to last rank but not promoting it to any piece would be the best move? By the way, I know this is an illegal move. Assume it is legal. Edit: Now we have a ...
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What would chess openings be like without castling and/or the double pawn move?

Chess has a fairly elegant set of rules, but it has two rather ugly "rules hacks" in it: Pawns can move two squares forward, but only on their first move, and have the rather ugly rule of en passant ...
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Live statistics chess960 from chess.com?

Cross-posted stackoverflow, but nothing. Both lichess and chess.com have the feature to play the variant chess960 live. However, only lichess has a graph showing how your live chess960 rating has ...
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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/...
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Online resources for medieval Persian chess games or problems?

I am looking for any collection of chess games of al-Suli or anyone medieval scholar's composition of games. Any resources would be appreciated.
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Longest possible game of Horde Chess

The longest possible normal game of chess has been calculated, but I want to know what the longest possible game of Horde Chess is. What makes this an interesting case is the crazy amount of pawn ...
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What are the shogi equivalents of Fool's and Scholar's mate?

In western chess, the Fool's mate and Scholar's Mate are two well-known mates that take very few moves from the starting position. What would be the shogi equivalents to these, or, more generally, ...
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Theoretically, is the analysis of the moves more complex if the objective is to be the first to be checkmated?

I have seen variations of other board games or strategy games where the aim is to actually 'lose' the game by forcing your opponents to make moves. Applying this concept to the rules of chess, would ...
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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....
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Chess480: Why 480?

From wiki: Lewis has named this chess variation "Chess480"; it follows the rules of Chess960 with the exception of the castling rules. Although a Chess480 game can start with any of 960 ...
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Official rules for castling in Chess960? (Is there a loophole?)

Note: this is another rules-lawyering question. I first ask for an official source I am calling into question the phrasing of the rules. Then I consider a few plausibly official sources, and point ...
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Relation between ratings for Chess960 and standard chess

Is there any relation or any attempt at discovering a relation between Chess960 ratings and standard chess ratings? This can be for GMs, for (any)M's, for pro players, or for all players on lichess/...
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Can you castle twice in Chess960?

Consider this Chess960 game. [FEN "rnkqbbnr/pppppppp/8/8/8/8/PPPPPPPP/RNKQBBNR w KQkq - 0 1"] 1. d4 Na6 2. e4 Nb8 3. Ba5 Na6 4. Bb5 Nb8 5. Qh5 Na6 6. Nh3 Nb8 7. Na3 Na6 8. O-O-O Nb8 9. Rd3 ...
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Winning percentage in chess 960

How does the winning percentage (white win/draw/black win) in chess 960 (Fischer random) compare to that of regular chess? Are there more white wins, fewer draws,...?

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