A chess puzzle · eight rooks

Swap the castles.

Four black rooks hold the left side. Four white rooks hold the right. Slide them like chess rooks until every colour has crossed over, with four empty squares as your only room to manoeuvre.

• 01

  Rooks move like chess

  Any number of empty squares in one straight line, then stop.

• 02

  No captures, ever

  A rook can never land on another rook, or jump over one.

• 03

  Swap every castle

  All four black rooks on the right, all four white rooks on the left.

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