Understand the game.
See the board differently.
Explore rules, pieces, openings, famous games, legendary players, tactical motifs, checkmate patterns, endgames, and an interactive chess laboratory.
Chess Rules
Movement, captures, check, checkmate, castling, en passant, promotion, draws and notation.
Study rules →Openings
Classical openings, gambits, systems, defenses and strategic ideas behind the first moves.
Browse openings →Tactics
Forks, pins, skewers, discovered attacks, deflections, sacrifices and combinations.
Learn tactics →Endgames
King and pawn endings, rook endings, opposition, basic mates and conversion technique.
Study endings →Quick Reference
Useful concepts, because apparently remembering everything is optional.
Control the center
Central squares give pieces greater mobility and influence. Classical development begins here for a reason.
Develop efficiently
Bring pieces into useful positions, connect the rooks, and avoid spending half the opening moving the same piece repeatedly.
King safety
Castling usually improves king safety and rook coordination, though chess naturally provides exceptions to everything.
Chess Rules
The machinery underneath the beautiful suffering.
The Pieces
Six piece types, each with its own way of ruining someone's afternoon.
Piece Values
| Piece | Common value | Mobility | Core role |
|---|---|---|---|
| ♙ Pawn | 1 | Limited | Structure, space, promotion |
| ♘ Knight | 3 | Short-range, jumps | Outposts, forks, closed positions |
| ♗ Bishop | 3 | Long-range | Diagonals, pressure, color complexes |
| ♖ Rook | 5 | Long-range | Open files, ranks, seventh rank |
| ♕ Queen | 9 | Very high | Attack, defense, tactical pressure |
| ♔ King | Priceless | One square | King safety, endgame activity |
Opening Library
Opening names are basically chess historians labeling arguments.
Famous Games
Historic battles worth replaying.
Famous Players
Champions, innovators and people who made the 64 squares look unfair.
Tactical Motifs
Patterns that turn calculation into controlled chaos.
Checkmate Patterns
Recognize the geometry before the opponent recognizes it.
Endgame Laboratory
Where king activity stops being a liability and becomes the whole point.
Core Endgames
Endgame Principles
- Activate the king.
- Passed pawns should be pushed carefully, not worshipped.
- Rook activity usually matters more than pawn grabbing.
- Learn opposition in king-and-pawn endings.
- Calculate pawn races to the end.
- Know the basic checkmates before attempting fancy ones.
Rule of the Square
In a pawn-versus-king race, imagine a square extending from the pawn toward its promotion rank. If the enemy king can enter that square, it may catch the pawn.
Opening Explorer
Search the built-in opening database by name, code, move or idea.
Starting Position
Search an opening or click a result to inspect its main idea.
| White win tendency | — |
| Black win tendency | — |
| Common draw tendency | — |
Interactive Chess Board
Click a piece, then click a legal destination. Humanity invented buttons, so use them.
Evaluation
Starting position • White to move
Selected Piece
Select a piece to see its legal movement highlights.
Keyboard
F flips the board. R resets it. U undoes the last move.
Interaction
Legal movement is generated for the standard pieces, including captures, castling and basic promotion handling. Check validation is included.