Kropki Loop
Rules[edit]
Draw a single closed loop that passes vertically and horizontally through all cells and through all of the given dots. When passing through a white dot, the number of cells on one side of the dot before turning must differ by 1 from the number of cells on the other side before turning. When passing through a black dot, the number of cells on one side of the dot before turning must be twice the number of cells on the other side before turning. (If a straight loop segment passes through two or more dots, ignore the other dots when counting cells.) Not all possible dots are marked.
(Rules and example from USPC 2019[1])
History of the puzzle[edit]
First appeared on WPC 2016/Round 3, a round themed on Kropki dots. Author of the puzzle was Matúš Demiger (Slovakia).
Appearances in the past WPCs[edit]
- WPC 2016/Round 3 by Matúš Demiger