Chess is a great game just the way it is. However, there are some fun and exciting variants of chess you might like to try. All of them use a standard chess board and pieces, but they have some slightly different rules.

Jocly Chess Variants free download, and many more programs. As a 'universal' chess program, it not only plays orthodox Chess, it is also capable of playing games reasonbly similar to Chess. It currently plays over 100 different chess variants, and can be programmed to play additional variants. Plays over 100 different Chess variants, including some that. In these variants, the same pieces and rules as in chess are used, but the board is different; It can be smaller or larger, the shape of either the board or individual spaces can be non-square or modular, or it can even be extra-dimensional or unbounded.The movement of pieces in some variants is modified in concurrence with the geometry of the gameboard.

Each variant will teach you something new and interesting about chess. They are fun to play, and they will sharpen your mind and your chess skills. If you get tired of playing normal chess, you can enjoy these fun chess variants.

Give Away Chess: The object of the game is to give away all your pieces. The first person to lose all their pieces wins. The trick to this game is that if you can take a piece, then you must take a piece. You are forced to capture. If you have a choice between two or more different ways to capture, then you can choose which way, but you must capture if you can. The king has no special value in this game. It is captured just like any other piece. This game is wild, fast moving, and fun!

No Take Chess: Pieces move normally in this game, but they cannot capture. It is the opposite of give away chess. You can never capture a piece. Two opposing pawns that are blocked will never move for the rest of the game. One of the strategies in this game is to invade the opponent’s territory with your pieces, then leave them there since they cannot be captured. You must still get checkmate to win. Checkmate often comes when a queen moves next to the opponent’s king, or when a knight gives smothered mate. This game usually does not last very long.

Madhouse Chess: This is a very crazy game. Whenever you capture a piece, you immediately place it back on the board. You can place it on any open square you wish, except pawns cannot be placed on the first or last ranks. You do not have to worry about losing your pieces in this game, because they always come right back. However, they may not come back where you want them. One of the strategies in this game is to capture the opponent’s queen and then place it in a corner of the board behind its other pieces. Then you can bury it there by placing more pieces around it so it cannot get out. Likewise, you may try to expose the opponent’s king by capturing the pieces around it and then placing them back on the board somewhere else far away. You must still get checkmate to win the game.

Superman Chess: In Superman chess, the king is much more powerful than a normal king. It is like Superman, and it moves and captures like a queen! But there is one time when the king is not so powerful, and that is when it is in check. When the king is in check it is weak, like kryptonite to Superman, and it reverts back to moving and capturing like a normal king. This is necessary because otherwise it would be almost impossible to put the king in checkmate. As soon as the king gets out of check, though, it goes back to being Superman again, and it moves and captures like a queen. One interesting side effect of this game is that the two kings can never line up across from each other, because they would have each other in check.

Fairy Chess: In fairy chess, pawns move and capture like kings. They can move and capture one square in any direction, including sideways, diagonally and backward! They can also move forward two squares on their first turn, just like a normal pawn. This makes fairy pawns much more powerful than normal pawns, and eliminates positions where two opposing pawns block each other. In fairy chess, opposing pawns can capture each other. Also, when a fairy pawn reaches the last rank, it does not promote to a queen. It stays a fairy pawn and it can move sideways or backward to get off the last rank.

Bughouse Chess: To play bughouse chess, you need two chess sets and four players. Two players form a team and play against the other two players. The chess sets are set up next to each other, and each team has white on one board and black on the other board. You play against one opponent on your board, and your partner plays against one opponent on the other board. The interesting part comes when captures are made. When you capture a piece, you give it to your partner. When it is his turn, instead of moving a piece, he can place it onto his board on any open square. Or, he can hold it for a while and place it later. When he captures a piece, he gives it to you, and you can place it onto your board when it is your turn. The only restriction when placing a piece is that you cannot place a pawn on the first or last rank. When a pawn moves to the last rank, you lay it on its side and promote it as usual, but when a promoted pawn is captured, it reverts back to being a pawn again. As partners, you can talk to each other and ask for a piece that you need, or ask your partner not to give the opponent a piece that he needs. This game is very social and a lot of fun.

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From the book, “TOTAL CHESS: Learn, Teach and Play the Easy 1-2-3 Way,” by John Herron

TOTAL CHESS is your complete guide to chess. It covers everything: rules, strategies, tactics and checkmates.

Everything in chess comes in threes. Three simple strategies are presented for the opening, midgame, endgame, etc. Each lesson is brief and covers one concept in simple language that everyone can read and understand.

In a new paper from DeepMind, this time co-written by 14th world chess champion Vladimir Kramnik, the self-learning chess engine AlphaZero is used to explore the design of different variants of the game of chess, with different sets of rules.

The paper is titled Assessing Game Balance with AlphaZero: Exploring Alternative Rule Sets in Chess and has been written by Deepmind's Nenad Tomasev, Ulrich Paquet, and Demis Hassabis, together with Kramnik. The Russian grandmaster has been working with DeepMind since last year, when we published his article about No-Castling chess.

On Friday, September 18 Chess.com hosted a round-table discussion with GM Vladimir Kramnik, IM Danny Rensch, and researchers of Deepmind discussing their latest paper in which AlphaZero explores chess variants. Here it is for replay:

In this new paper (here in PDF), No-Castling chess is one of nine chess variants that have been looked at. AlphaZero functioned as the tool to simulate decades of human play in a matter of hours, which made it possible to see what games between strong human players in these variants would potentially look like.

Game design, in general, is complicated. Coming up with a new chess variant that actually works, is not easy either. The researchers write: 'Designing engaging and balanced sets of game rules is non-trivial, due to difficulties in assessing the consequences of individual changes on game dynamics and appeal.'

Chess.com's Chief Chess Officer, International Master Danny Rensch, reviewed the paper in detail during the embargo period which Chess.com had privileged access to the games, and he created this quick breakdown (as well as several more videos to come!) of some of the high level takeaways from the report, as well as his own entertaining ranking of the 'Top Ten List' of the variants played by AlphaZero here:

By using the reinforcement learning system AlphaZero, the researches wanted to show the potential of AlphaZero to be used 'as a tool for creative exploration and design of new chess variants.'

The nine variants that were tested by AlphaZero

For each variant, AlphaZero was trained from scratch and then played a large number of games against itself: 10,000 games at one second per move, and another 1,000 with one minute per move. Based on these games, both a quantitative and a qualitative assessment was done in the paper.

Quantitative assessment

For each variant, the expected draw rate and first-move advantage, expressed as the expected score for White, were determined. Expectedly, these were different for the different time controls and for all variants it was the case that there would be more draws for the one-minute games compared to the one-second games.

'This seems to suggest that the starting position might be theoretically drawn in these chess variants, like in classical chess, and that some of the variants are simply harder to play, involving more calculation and richer patterns,' the researchers write.

The paper also illustrates how the same opening can lead to vastly different outcomes under different chess variants. This was done by forcing AlphaZero to play the Dutch defense, the Chigorin defense, the Alekhine defense, and the King's Gambit in 1,000 games each, in all variants except for Pawn one square.

For the variants that have additional move options on top of the classical ones (like self-capture), it was analyzed how often these options were utilized by AlphaZero. It turned out that the non-classical moves were used in a large percentage of games, often multiple times per game, in each of the variants. 'This suggests that the new options are indeed useful, and contribute to the game,' the researchers write.

Another interesting segment from the paper is the approximations for piece values in each of the variants. These were computed from a sample of 10,000 fast-play AlphaZero games:

Qualitative assessment

Besides their quantitative analysis, the researchers also wanted to answer more subjective questions about the aesthetic value of the types of positions, moves, and patterns that arise in the different variants. This is where Kramnik enters.

In order to try and evaluate which of the variants could be most interesting to play for humans, the former world champion characterizes the typical patterns, motifs, and even style of AlphaZero's play.

As brought forward in last year's article, Kramnik calls No-castling chess a potentially exciting variant, 'given that king safety is often compromised for both players, allowing for simultaneous attacking and counter-attacking and the equality, when reached, tends to be dynamic in nature rather than 'dry.' The multitude of approaches to evacuate the king, and their timing, adds complexity to the opening play.'

Kramnik feels that not allowing castling before move 10 isn't different enough from classical chess; AlphaZero tends to castle in most games anyway. He feels the same about Stalemate=win chess, where only certain endgames are evaluated differently.

The most complicated variant, according to Kramnik, is Pawn-sideways chess as it results in 'patterns that are at times quite 'alien' when one is used to classical chess. The pawn structures become very fluid and it is impossible to create permanent pawn weaknesses.'

Examples

Chess Variants Org

Below is an example game from each of the nine variants with excerpts of Kramnik's comments given in the paper. The last five are given as embedded videos since our game viewer cannot handle the alternative rules! (We're working on that.)

No-castling

'One of the main advantages of no-castling chess is that it eliminates the nowadays overwhelming importance of the opening preparation in professional chess, for years to come, and makes players think creatively from the very beginning of each game,' writes Kramnik. 'This would inevitably lead to a considerably higher amount of decisive games in chess tournaments until the new theory develops, and more creativity would be required in order to win. These factors could also increase the following of professional chess tournaments among chess enthusiasts.'

No-castling (10)

'The main purpose of the partial restriction to castling, as a hypothetical adjustment to the rules of chess, would be to sidestep opening theory,' writes Kramnik. 'As such, it is aimed at professional chess as an option to potentially consider. The game itself does not change in other meaningful ways, and AlphaZero usually aims at playing slower lines where castling does indeed take place after the first 10 moves.'

Pawn one square

'The basic rules and patterns are still mostly the same as in classical chess, but the opening theory changes and becomes completely different,' writes Kramnik. 'Intuitively it feels that it ought to be more difficult for White to gain a lasting opening advantage and convert it into a win, but since new opening theory would first need to be developed, this would not pertain to human play at first. In most AlphaZero games one can notice the rather typical middlegame positions arise after the opening phase.'

Stalemate=win

Two knights vs. a lone king is now a win.

'Looking at the games of AlphaZero, it seems that there are enough defensive resources in most middlegame positions that certain types of inferior endgame positions, now possible under this rule chance, could be avoided and defended,' writes Kramnik. 'A strong player can in principle learn to navigate to these positions to take advantage of them, or find ways to escape them.'

Torpedo

The pawns become quite powerful in Torpedo chess,' writes Kramnik. 'Passed pawns are in particular a very strong asset and the value of pawns changes based on the circumstances and closer to the endgame. All of the attacking opportunities increase and this strongly favours the side with the initiative, which makes taking initiative a crucial part of the game. Pawns are very fast, so less of a strategical asset and much more tactical instead. The game becomes more tactical and calculative compared to standard chess.'

Semi-torpedo

'Semi-torpedo chess seems to be more decisive than classical chess, and less decisive than Torpedo chess,' writes Kramnik. 'It is an interesting variation, to be potentially considered by those who like the general middlegame flavor of Torpedo chess, but are unwilling to abandon existing endgame theory.'

Pawn-back

The Pawn-back version of chess allows for more fluid and flexible pawn structures and could potentially be interesting for players who like such strategic maneuvering,' writes Kramnik. 'Given that Pawn-back chess offers additional defensive resources, winning with White seems to be slightly harder, so the variant might also appeal to players who enjoy defending and attackers looking for a challenge.'

Pawn-sideways

'This is the most perplexing and “alien” of all variants of chess that we have considered,' writes Kramnik. 'Even after having looked at how AlphaZero plays Pawnside chess, the principles of play remain somewhat mysterious – it is not entirely clear what each side should aim for. The patterns are very different and this makes many moves visually appear very strange, as they would be mistakes in Classical chess. (...) This variant of chess is quite different and at times hard to understand, but could be interesting for players who are open to experimenting with few attachments to the original game!

Play Chess Variants Online

Self-capture

'I like this variation a lot, I would even go as far as to say that to me this is simply an improved version of regular chess,' writes Kramnik. (...) 'Regardless of its relatively minor effect on the openings, self-captures add aesthetically beautiful motifs in the middlegames and provide additional options and winning motifs in the endgames. (...) To conclude, I would highly recommend this variation for chess lovers who value beauty in the game on top of everything else.'

The 97-page paper includes many more games and explanations from Kramnik that are both instructive and fun. You can download it here in PDF.

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