Place the given pieces into each cell of the grid, so that each piece appears exactly once in each row and column. Every “blind end“ of a line (an edge that is not connected to another line) is marked with a circle.
(Rules and example from WPC 2016 IB)
History of the puzzle
First appeared on WPC 2016/Round 11, an "innovative" round under the name "Railroads". The author of the puzzle was Matej Uher (Slovakia). Later appeared on Puzzle GP 2019 Round 7 under the name "Endpoints", possibly to avoid confusion with Railroad Tracks, a puzzle also called Railroads.
Appearances in the past WPCs
- WPC 2016/Round 11 by Matej Uher