Chess

1 Overview & History

Chess is a two-player strategy board game played on an 8×8 grid of 64 squares. Each player controls 16 pieces, one king, one queen, two rooks, two bishops, two knights, and eight pawns. The objective is to checkmate the opponent's king: place it under inescapable attack.

Chess originated around 600 AD in India as a game called Chaturanga. It spread to Persia (as Shatranj), then to the Arab world, and reached Europe by the 10th century. The modern rules, including the powerful queen, en passant, and castling, were standardized in Europe around 1475. Today, FIDE (the World Chess Federation) governs international competition, and an estimated 600 million people play chess worldwide.

Chess was the first game to be deeply analyzed by computers. In 1997, IBM's Deep Blue defeated world champion Garry Kasparov, a landmark moment in AI history. Today, engines like Stockfish and AlphaZero play at superhuman levels, but chess remains as popular as ever for human competition.

2 Board Setup

Place the board so that a light square is in the bottom-right corner for both players. The pieces are arranged on ranks 1–2 (White) and 7–8 (Black):

White always moves first. Players alternate turns. Each turn you must move exactly one piece (castling moves king and rook together as one move).

3 How Each Piece Moves

♔♚ King

Moves one square in any direction, horizontally, vertically, or diagonally. The king may never move to a square that is attacked by an enemy piece. The king is the most important piece; losing it means losing the game.

♕♛ Queen

The most powerful piece. Moves any number of squares in any direction, horizontally, vertically, or diagonally, as long as no piece blocks its path. Value: ~9 pawns.

♖♜ Rook

Moves any number of squares horizontally or vertically. Rooks are most powerful in open files (columns with no pawns blocking them) and on the 7th rank. Value: ~5 pawns. Two rooks working together ("doubled rooks") are devastatingly powerful.

♗♝ Bishop

Moves any number of squares diagonally. Each bishop is forever confined to one color of square. A "good bishop" has open diagonals; a "bad bishop" is blocked by its own pawns. Value: ~3 pawns (slightly more in open positions). Two bishops together (the "bishop pair") are very powerful in open games.

♘♞ Knight

Moves in an L-shape: two squares in one direction, then one square perpendicular. Knights are the only piece that can jump over other pieces. Value: ~3 pawns. Knights are strongest in closed positions where the L-shape lets them hop over blocked pawns.

♙♟ Pawn

Pawns are complex despite looking simple:

• Move: Forward one square (or two squares on its first move)
• Capture: Diagonally forward one square only
• Cannot move backward
• Promotion: Reaching the back rank promotes to any piece (except king)
• En passant: Special capture (see Special Moves)

Pawns are the soul of chess. Pawn structure, passed pawns, isolated pawns, doubled pawns, pawn chains, determines the character of the entire game. Value: 1 point each.

4 Special Moves

Castling

Castling is a defensive king move that also activates the rook. The king moves two squares toward a rook, and the rook jumps to the square on the other side of the king.

Castling is illegal when:

• The king has previously moved
• The rook being used has previously moved
• Any square between king and rook is occupied
• The king is currently in check
• The king passes through a square under attack
• The king's destination square is under attack

En Passant

When a pawn moves two squares forward from its starting position and lands beside an enemy pawn, the enemy pawn may capture it as if it had moved only one square. This capture must be made immediately on the very next move, you cannot do it later.

En passant was introduced in the 15th century when the two-square pawn advance was added. It prevents a pawn from bypassing an enemy pawn's attack range.

Pawn Promotion

When a pawn reaches the opponent's back rank (rank 8 for White, rank 1 for Black), it must be immediately promoted to a queen, rook, bishop, or knight, the player's choice. Promoting to a queen (called "queening") is almost always best. Promoting to a knight ("underpromotion") is occasionally the right call to deliver checkmate or avoid stalemate.

5 Check, Checkmate & Stalemate

Check

The king is in check when it is under direct attack by an enemy piece. When in check, the player must immediately resolve it, there are only three ways:

1. Move the king to a safe square
2. Block the check by interposing a piece between the attacker and the king
3. Capture the attacking piece

You may never make a move that leaves your own king in check.

Checkmate

Checkmate occurs when the king is in check and there is no legal move to escape. The game ends immediately, the player who delivered checkmate wins. There is no "taking" the king in chess; the game ends as soon as checkmate is unavoidable.

Stalemate

Stalemate occurs when a player has no legal moves and their king is NOT in check. The game is a draw. Stalemate is a critical concept, a losing player should constantly look for stalemate opportunities to salvage a draw.

Other Draw Conditions

6 Algebraic Notation

Algebraic notation is the universal language for recording chess moves. Every serious player should know it.

Example game notation (Scholar's Mate): 1.e4 e5 2.Qh5 Nc6 3.Bc4 Nf6?? 4.Qxf7#, White wins in 4 moves.

7 Opening Principles & Famous Openings

The Three Core Opening Principles

1. Control the center, Occupy or attack the central squares (e4, d4, e5, d5) with pawns and pieces
2. Develop your pieces, Get knights and bishops off the back rank and into active positions in the first 10 moves
3. King safety, Castle early to tuck your king away; don't leave it in the center

Famous Opening Systems

8 Core Tactics

Tactics are short-term sequences that win material or deliver checkmate. Mastering these patterns is the fastest way to improve.

9 Endgame Basics

The endgame begins when most pieces have been exchanged. Pawns become critically important, every passed pawn is a potential queen.

• King activity: In the endgame, the king becomes a powerful attacking piece. Centralize it.
• Passed pawns: A pawn with no enemy pawns blocking or attacking its path to promotion. Always push them.
• Opposition: When two kings face each other with one square between them, the player who does NOT have to move has the "opposition", a key endgame advantage.
• King + Queen vs. King: Always a win. Force the enemy king to a corner, then deliver checkmate.
• King + Rook vs. King: Always a win. Use the "lawnmower" technique, cut off the king rank by rank.
• King + Bishop vs. King: Draw (insufficient material).
• King + Knight vs. King: Draw (insufficient material).

10 Piece Values & Material

Material balance guide: A rook (5) vs. bishop + knight (3+3=6) is called "the exchange", the side with the rook is down the exchange. Three pieces (9) roughly equal a queen (9). These are guidelines, not absolute rules, piece activity and position often matter more than raw material count.

11 Chess by the Numbers

12 Strategy Tips for Beginners

• Don't move the same piece twice in the opening unless forced to. Develop new pieces each turn.
• Don't bring your queen out early. It will be chased around by enemy pieces, wasting tempo.
• Castle before move 10. King safety is paramount, centralized kings get attacked.
• Connect your rooks. After castling and developing, clear the back rank so your rooks can work together.
• Think before you move. Ask: "Is my piece safe there? Does this move help my position? Does it create weaknesses?"
• Watch for hanging pieces. Before moving, check if you're leaving any of your pieces undefended (hanging), and whether your opponent has any.
• Trade pieces when you're ahead in material. Simplified positions favor the side with more material.
• Activate your king in the endgame. The king is a powerful piece once the queens are off the board.

13 Play Chess Online

Ready to put these rules into practice? Chess.com is the world's largest chess platform with over 100 million members. It offers:

• Free games against players of all skill levels worldwide
• Built-in game analysis and lessons
• Puzzles to sharpen your tactics
• Live tournaments and titled player matches

14 Frequently Asked Questions

How do you win at chess?

You win by checkmating your opponent's king, putting it in a position where it is under attack and cannot escape. The game also ends if your opponent resigns or if a draw condition occurs (stalemate, insufficient material, threefold repetition, or the 50-move rule).

How do pawns move in chess?

Pawns move forward one square at a time. On their first move, they may advance two squares. Pawns capture diagonally forward one square. They cannot move backward.

What is castling in chess?

Castling is a special move where the king moves two squares toward a rook, and the rook jumps to the other side of the king. You can castle kingside (short) or queenside (long). Castling is illegal if: the king or rook has already moved, any square between them is occupied, the king is in check, or the king passes through or lands on an attacked square.

What is en passant?

En passant is a special pawn capture. If a pawn advances two squares from its starting position and lands beside an enemy pawn, the enemy pawn may capture it as if it had moved only one square, but only immediately on the next move. If you don't take en passant right away, the opportunity is gone.

What is stalemate?

Stalemate occurs when the player whose turn it is has no legal moves and their king is NOT in check. The game ends immediately as a draw. This is a common tactic in losing positions, forcing stalemate to avoid defeat.

What is the most powerful piece in chess?

The queen is the most powerful piece, combining the movements of the rook and bishop. It can move any number of squares in any direction (horizontally, vertically, or diagonally). The queen is typically valued at about 9 pawns.

What are the piece values in chess?

Standard piece values: Pawn = 1, Knight = 3, Bishop = 3 (slightly more in open positions), Rook = 5, Queen = 9, King = infinite (cannot be traded). These are guidelines for material evaluation, not absolute rules.

What is algebraic notation in chess?

Algebraic notation records moves using the piece letter (K=King, Q=Queen, R=Rook, B=Bishop, N=Knight, pawns have no letter) followed by the destination square (e.g., 'e4'). Captures use 'x' (Nxf3). Check is '+', checkmate is '#'. Castling is O-O (kingside) or O-O-O (queenside).

How many possible chess games are there?

The number of possible chess games is estimated at 10^120, a number larger than the atoms in the observable universe. This is known as the Shannon Number. After just 4 moves each, there are over 288 billion possible positions.

What is the 50-move rule in chess?

If 50 consecutive moves are made by both players without a pawn move or a capture, either player can claim a draw. This prevents games from going on indefinitely in theoretically drawn endgame positions.

What is promotion in chess?

When a pawn reaches the opponent's back rank (rank 8 for White, rank 1 for Black), it must be promoted to any piece except a king, queen, rook, bishop, or knight. Promoting to a queen (queening) is most common, but promoting to a knight (underpromotion) is sometimes the right move to avoid stalemate.

Can a king take a piece in chess?

Yes, a king can capture any enemy piece that is adjacent to it, as long as doing so does not put the king in check. A king cannot move to a square attacked by any enemy piece.

What is a fork in chess?

A fork is a tactical move where one piece simultaneously attacks two or more of the opponent's pieces, forcing them to lose material. Knights are especially deadly forkers because of their unusual L-shaped movement.

How long does a chess game last?

A casual game lasts 10–60 minutes. Tournament games with standard time controls (90 minutes per player + increments) can last 4–6 hours. Blitz chess (3–5 minutes per player) takes under 10 minutes. Online bullet chess (1 minute) is over in seconds.

13 History of Chess

Chess originated in the Gupta Empire of northern India around the 6th century AD, where it was called Chaturanga (Sanskrit for "four divisions" of the military: infantry, cavalry, elephants, and chariots). These became the pawn, knight, bishop, and rook.

The game spread westward to Persia, where it became Shatranj. The Persians added the phrase "Shah!" (King!) when attacking the king, which became the modern "Check." When Arab armies conquered Persia in the 7th century, chess spread across the Islamic world and into Spain and Sicily, reaching Europe by the 10th century.

In Europe, the rules shifted dramatically in the 15th century: the queen gained her modern, far-reaching power (she had been weak in Arabic chess), and the bishop gained diagonal range. These changes made chess much faster and more tactical. Modern chess rules stabilized by the 1800s.

The World Chess Federation (FIDE) was founded in 1924 in Paris. The first official World Chess Championship was held in 1886, won by Wilhelm Steinitz. Bobby Fischer became the first American World Champion in 1972, defeating Boris Spassky in a Cold War showdown in Reykjavik, Iceland. Garry Kasparov held the title from 1985 to 2000 and is widely considered the greatest player of all time. Magnus Carlsen became World Champion in 2013 and held the title until 2023.

14 The Elo Rating System

The Elo rating system, developed by Hungarian-American physics professor Arpad Elo, is used to calculate the relative skill levels of chess players. It was adopted by FIDE in 1970 and has since been applied to many other games and sports.

A new rated player typically starts around 800 to 1000. Key benchmarks:

• Below 1200, Beginner: learning basic tactics and piece values
• 1200 to 1600, Intermediate: understands openings, basic endgames
• 1600 to 2000, Club player: consistent tactical vision, opening theory
• 2000+, Expert/Candidate Master: strong calculation depth
• 2200+, FIDE National Master
• 2400+, International Master (IM)
• 2500+, Grandmaster (GM)
• 2700+, Super-GM; top 50 in the world
• 2800+, Historical peak of world champions (Carlsen peaked at 2882)

When two players compete, the expected outcome is calculated based on the rating difference. A 200-point gap means the stronger player wins roughly 75% of the time. Points transfer: if a 1600 beats a 1400, the 1600 gains about 5 points; if the 1400 wins, they gain about 27 points (the upset is more surprising).

Online ratings (Chess.com, Lichess) are separate from FIDE ratings and tend to run 100 to 300 points higher than FIDE equivalents.

15 Famous Games Every Chess Player Should Know

The Immortal Game (1851)

Played between Adolf Anderssen and Lionel Kieseritzky in London, the Immortal Game is the most celebrated attacking game in chess history. Anderssen sacrificed both rooks, a bishop, and then his queen, and still won by checkmate using only his three remaining minor pieces. The final position (Bc4-Bxg7#) shocked observers. It demonstrated that piece activity and king attack could be worth far more than material advantage.

The Game of the Century (1956)

Bobby Fischer was just 13 years old when he defeated International Master Donald Byrne in this game at the Rosenwald Memorial Tournament in New York. Fischer sacrificed his queen on move 17 to gain a decisive positional advantage, then conducted a precise endgame to win. Chess historians consider it one of the greatest games ever played, and Fischer was immediately recognized as a prodigy of the highest order.

Kasparov vs. Deep Blue (1997)

In May 1997, IBM's chess computer Deep Blue defeated World Champion Garry Kasparov 3.5 to 2.5 in a six-game match, marking the first time a computer beat a reigning World Champion under standard time controls. The match raised profound questions about artificial intelligence, computation, and human cognition that remain relevant today.

16 Wrong House Rules

These common misconceptions about chess rules are widespread but incorrect:

• "Touch-move" is optional, In official play, the touch-move rule is strictly enforced: if you touch a piece, you must move it (if it has a legal move). If you touch an opponent's piece, you must capture it if possible. You may say "I adjust" (or "j'adoube") before touching a piece to reposition it without being required to move it.
• Stalemate is a win for the player who caused it, Stalemate is always a draw. If your opponent has no legal moves but is not in check, the game is drawn immediately. Many beginners believe the player who "trapped" the king wins, but this is incorrect.
• The queen can jump over pieces, The queen cannot jump. Only the knight can jump over other pieces.
• Pawns can move two squares any time, The two-square pawn advance is only available on a pawn's very first move. After that, pawns move one square at a time.
• You can castle out of check, You cannot castle while in check, when the king passes through a square that is under attack, or when the king or the rook involved has previously moved.
• En passant is optional, En passant must be executed immediately or not at all. If you do not capture en passant on the very next turn, the opportunity is gone.
• A new queen must be the same color as the board queen, You may have multiple queens on the board at once. If all queens are used, a coin or inverted rook is traditionally used to represent the new queen.

17 Frequently Asked Questions

Can a pawn promote to a piece that was already captured?

Yes. You may promote to any queen, rook, bishop, or knight regardless of how many of that piece are still on the board. This means you can legally have two or more queens.

What happens if neither player can checkmate?

The game is a draw. Insufficient mating material (e.g., king vs. king, king and bishop vs. king) is an automatic draw. Players may also agree to a draw or claim a draw by threefold repetition or the 50-move rule.

What is the 50-move rule?

If 50 moves pass with no pawn moved and no piece captured, either player may claim a draw. This prevents indefinite play in endgames where one side has a theoretical advantage but cannot force checkmate.

What is threefold repetition?

If the same position occurs three times during a game (with the same player to move and the same available moves), either player may claim a draw. The positions do not need to occur on consecutive moves.

Can the king move into check?

No. A king may never move to a square that is attacked by an opposing piece. Attempting to do so is an illegal move.

What is zugzwang?

A position in which the player whose turn it is to move would be better off not moving at all. In zugzwang, every available move worsens your position. Common in endgames, particularly king and pawn endgames.

How long can a chess game last?

Theoretically, a chess game could last up to 5,899 moves (the maximum under FIDE's 50-move rule and seventyfive-move rule). In practice, most games at the club level last 40 to 80 moves; grandmaster games typically 30 to 60 moves.

Can you be in check and stalemate at the same time?

No. Stalemate requires that you are NOT in check but have no legal moves. If you are in check and have no legal moves, that is checkmate, not stalemate.

Is there a minimum number of moves to win?

The fastest possible checkmate is Fool's Mate, which takes only 2 moves for Black to deliver: 1. f3 e5 2. g4 Qh4#. The fastest checkmate for White is Scholar's Mate in 4 moves, though experienced players easily avoid it.

What is a draw by agreement?

Either player may offer a draw on their turn, after completing a move. The other player may accept or decline. If declined, the offer cannot be renewed until the other player has made a move.