Queen's Park

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Queen's Park Example.png Queen's Park Example Solution.png

Place the given number of queens into the grid so that none of them stands on a number and each number equals to the number of directions from which the given square is attacked by a queen. A queen attacks to arbitrary distance horizontally, vertically and diagonally. Queens block other queens.

(Rules (modified) and example (5 queens) from WPC 2005 IB)

Rule variations[edit]

  • Most popularly the goal is to place given number of queens, but this puzzle works with any set of chess pieces.

History of the puzzle[edit]

The name of this article is based on a puzzle from WPC 2005/Part 11, "Innovative" round.

However, a version of this puzzle that uses 5 different chess pieces appeared on December 1995 issue of GAMES magazine. Author of the puzzle was Rodolfo Kurchan (Argentina).[1]

Original title "Amenaza fantasma" was can be translated to "Ghost Threat". This name coincides with the Spanish title for the film Star Wars: Episode I - The Phantom Menace, but the film was released in 1999.

Appearances in the past WPCs[edit]