GridWits
Easy tier Technique 3 of 31 Used by Smart Hint

Clue Complete

Once a clue already has all its required lines, every undecided side around it is an X.

How it works

  1. 1The clue is 1 and one side is already drawn, so this cell has all the line it is ever going to get.
  2. 2Anything else on its border would push the count past 1, which no later deduction can undo.
  3. 3Cross off the bottom, the left and the right.
1
  • Edge on the loop
  • Edge ruled out
  • Cells that establish the pattern
Next in the ladder Clue Needs Every Side →

When a clue still needs exactly as many lines as it has undecided sides, every one of those sides is a line.