Missing Corners

From WPC unofficial wiki

Rules[edit]

Draw a single closed loop going only vertically/horizontally through the centers of the cells. The loop cannot touch or cross itself. The loop can make turns only on marked (circled) cells.

One circle is missing in every row/column.

(Rules and example from WPC 2015 IB (circles in the solution were added only for illustrative purposes))

History of the puzzle[edit]

Probably first appeared on WPC 2015/Round 4. Author of the puzzle was Vladimir Portugalov (Belarus).

Appearances in the past WPCs[edit]