RoyalDoku

Movement is the clue. Every board verified solvable by logic.

Every image below is the running game, captured from the build linked above — real positions the game produced, nothing mocked up.

The Show why replay refuting a hypothetical queen placement — **“Show why” — the guarantee, demonstrated** Step 3 of 6: *“Suppose the Queen sat at h8 instead…”* The game places the hypothesis on the board in red and then refutes it, sweeping the attacks that make it impossible. This is why the no-guess promise is a checked property rather than a slogan — being stuck always means an inference is waiting, and the game will walk you through the exact one.

A daily solved by deduction One board for everyone that day. Each reveal makes the game sweep that piece’s attack lines and eliminate every square they cover, so the board visibly does the reasoning with you.

A daily board half solved — **Half the court found** Red crosses are the game’s own eliminations, swept from the attacks of pieces already placed. Amber ones are yours. The counters track what is left of each piece type — here one queen of four and three knights of four.

The Advanced level ladder — **The Advanced ladder** Classic uses row, column and region. Advanced drops the row and column rule entirely, so the pieces are kept apart *only by their own attacks* — Queens, Queens & Knights, Queens & Bishops, Queens & Kings, Full Court, and Identify, where the locations are known and the piece types are not.

A solved board — **Solved** The full court, rediscovered. Every board ships only if an offline solver has proved it finishable by human-style deduction alone.

Puzzles, and their answers

Each pair is one real generated board: the position as it is dealt, and the same board with the court rediscovered. Every one of them was proved finishable by human-style deduction before it shipped.

Knights Only as dealt — **Knights Only**Every piece is a knight, so the only thing keeping them apart is the knight’s own leap — the least intuitive attack pattern in chess, which is exactly why it is a good teacher.

Knights Only solved — **Knights Only**Every piece is a knight, so the only thing keeping them apart is the knight’s own leap — the least intuitive attack pattern in chess, which is exactly why it is a good teacher.

Queens Only as dealt — **Queens Only**Eight queens, none attacking, one to a row, a column and a region. The classic problem, but you are not placing them — you are deducing where they already are.

Queens Only solved — **Queens Only**Eight queens, none attacking, one to a row, a column and a region. The classic problem, but you are not placing them — you are deducing where they already are.

Mixed Pieces as dealt — **Mixed Pieces**Different pieces on one board. Now a square is ruled out only if you know which piece is doing the ruling.

Mixed Pieces solved — **Mixed Pieces**Different pieces on one board. Now a square is ruled out only if you know which piece is doing the ruling.

Identify the Piece as dealt — **Identify the Piece**The locations are given and the types are not. The deduction inverts: you know where the court stands and have to work out who each of them is.

Identify the Piece solved — **Identify the Piece**The locations are given and the types are not. The deduction inverts: you know where the court stands and have to work out who each of them is.

The same board drawn with coloured regions instead of walls — **An alternate board style** The regions can be drawn as colour instead of masonry. The walls are the default because a wall already says everything the colour does — a region is whatever the walls enclose — and it keeps the board readable without relying on hue.

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