From Chaturanga to the Queen: How the Rules of Chess Changed Over Time

Chess has changed a great deal over its 1500-year history. Everything from the cast of characters to the board size has shifted over the centuries. Even today, new rules have been introduced to address the modern landscape of engines and online chess.

Here, we will look at the rules of chess throughout its history, from the early days of Chaturanga and Shatranj, through Medieval Europe to the 19th, 20th, and finally the 21st Century.

Early Chess Rules

Chess was first played in India. There, in the 7th Century, was a game remarkably similar to the version we play today. However, there were some key differences.

The Rules of Chaturanga

The identity of the pieces was different, but each has a modern equivalent:

• King = Raja (same movement)
• Queen = Mantri, the minister, moves one square diagonally in any direction.
• Rook = Ratha, the chariot, moves as it does today along rows and columns. 
• Bishop = Gaja, the elephant, moved in a variety of ways according to different records. In one iteration, it could move two squares diagonally and could jump on its first move.
• Knight = Ashva, the horse, has kept its characteristic L-shape movement throughout the centuries. 
• Pawn = Padati, the foot soldier, moves as it does today with the exception of the option to move two squares on the first turn.

The board was 8x8 in squares. It nearly had a standard board setup except for one key difference: the kings and counselors did not necessarily face each other directly across the board. Instead, the king faced the enemy counselor.

The rules about how the game could end are somewhat uncertain and fuzzy. Most agree that the game could end by capturing the opponent’s king. Some think there was no checkmate victory condition at the time. Other rules suggest you could also win by capturing all of an opponent’s pieces, leaving a “bare king.” Evidence also suggests stalemate and draw rules. 

A Note on Shatranj

Chaturanga seems to have been popular in India, and this enthusiasm spread to the Sasanian Empire in modern-day Iran, where it was called Shatranj. This matters because it likely originated here: check and checkmate.

The word checkmate actually comes from the Persian: shāh māt. This means “the king is trapped.” Check seems to have developed from the practice of warning that the king was under threat by saying “shāh” out loud. 

While it is astonishing how close chaturanga is to the modern game, people often forget that this defining aspect of chess first appeared in Persia. 

Rules of Medieval European Chess

By the time chess reached Europe, many of the rules were already in place. However, several crucial changes were still needed to create the game we know today.

The Queen

As we have seen, the king’s right-hand man had limited powers in the Indian and Persian games. The minister or counselor could guard the king and create attacks, but the paltry two squares meant it paled in comparison to early rooks.

The arrival of the queen, with the sweeping powers of full diagonals and lines, is a crucial change that completely transformed the game and would require rules of its own. She appeared with the abilities we know today in the 15th century.

Pawn promotion in some form has existed from the very beginning. Now, promotion to a queen made it a much more significant and game-changing rule. 

The Powerful Bishop

The elephant's identity was well established, but in Europe another figure in the feudal hierarchy deserved recognition. Like religious leaders, bishops were powerful political and even military figures. 

The chess piece gained a new identity and greater mobility. The bishop’s diagonal path across the entire board gave it the ability to contest the center from the flank and create sudden, unexpected attacks. Again, a piece grew more powerful, and the games became more dramatic and exciting. 

The Castle Fortress

Castling, as we know it, arrived around this time. Previously, there had been a collection of moves known as the king’s leap. This one-off move let the king escape danger, an early solution to the piece’s vulnerability in the center of the board. Different versions allowed the king to move two squares or like a knight on its first move.

As the queen and bishop became more dangerous on the board, the king’s position in the center became less tenable. Various castling moves began to spring up. Most involved the flipping of the king and rook, but the final squares they landed on changed from country to country. Sometimes, castling also required two moves. The final version we know today solidified in the mid-17th century. This included related ideas like not being allowed to castle through check and the castling rights rule.

Pawn Moves

Another invention of European chess players was the option of a two-move start for the pawn. Like the long-range powers of the queen and bishop, this made the game faster and more exciting. This innovation helped the opening develop as a time to contest the center of the board.

To account for it, another of chess’s special moves arrived. En passant appeared after the two-move start. It was a way to stop pawns on the back rank from being allowed to jump into the central fray past enemy pawns. 

Modern Chess Rules: 19th to the 21st Century 

By the 19th century, these medieval rules had solidified. Nevertheless, many rules were still to be added. Chess would transform from a popular game to an international sport with its own federations, tournaments, and ranking systems. To accommodate these changes, new chess organizations and tournament runners introduced a selection of new rules.

19th Century: Standardization 

As chess tournaments grew in popularity, new rules ensured every possible eventuality was accounted for.

For example, the threefold repetition draw was first formalized at the 1883 London International Tournament. The rule allows players to claim a draw if they reach the same position three times. This helps to end games in a variety of drawn situations. Most commonly, this occurs when both players have only one good or improving move they can repeat without changing the position. By that time, chess clocks were in competitive use, and the 1883 London tournament used them with a 15-moves-per-hour time control.

Another development was standardizing the rule that White moves first. This rule shaped how chess is studied and formed the basis for the openings we use today. Other rules like en passant and promotion varied across countries, but these differences were ironed out in the 19th century.

20th Century Chess: Tournament Readiness 

This was the century in which the International Chess Federation (FIDE) would appear. Chess grew not only as a pastime, but as a competitive sport in which nations and players contested global dominance. In this context, still more tournament rules developed. 

The 50-move rule had been around for some time. However, as chess theory developed, players discovered more theoretically drawn endgames, making it necessary to introduce the rule officially. It states that if neither player makes a capture or pawn move for 50 moves, either player can claim a draw. Similarly, the touch rule had existed for centuries, but FIDE formalized it as a tournament regulation. 

In this period, many rules were created to govern chess tournaments. Chess federation rulebooks covered everything from cheating to leaving the board.

21st Century Chess: New Rules?

Today, we have the FIDE Laws of Chess. It may seem that there’s no need for new chess rules. The truth is, the game is still changing, and chess federations are still creating and refining rules.

Perhaps the defining factor of this era of chess is the presence of chess engines. The paramount abilities of chess-playing computers have deepened chess analysis and theory, and made it extremely easy to cheat. Extensive rules now try to stop players from using chess engines in tournaments, most explicitly with an outright ban on electronic devices in the playing area.

Other rules have developed. For example, the 50-move draw now has an addition: even if neither player claims a draw, the game automatically ends in a draw after 75 moves. The popularity of speed chess time controls has also led to new rules. For example, multiple illegal moves in blitz games now lead to forfeiture rather than a time penalty. 

Overall, chess rules continue to change. While the fundamentals of the game remain, the rulebook has evolved throughout history.