The case notes
Use an unsettled digit to rule out a nearby cell
In this anti-king puzzle, we do not know where the nine goes in the upper-left box. We can still use it to rule out nine nearby. Watch a worked example, then try the idea in a puzzle.
Put it into practice
An unsettled 9 can still help
In this anti-king puzzle, we do not know where the nine goes in the upper-left box. We can still use it to rule out nine nearby.
Box nine: r3c2 or r3c3
The nines in rows one and two clear those rows from this box. The nine in column one clears its lower-left cell. Only these two places remain.
Column sight + king sight
Now look just below the box. This cell sees the first place by column. It sees the second diagonally, because a king cannot repeat a digit one step away.
Neither cell below can be 9
Whichever of the two box cells holds nine, this cell cannot. Remove nine here. The cell beside it loses nine for the same reason.
Read the transcript
In this anti-king puzzle, we do not know where the nine goes in the upper-left box. We can still use it to rule out nine nearby. The nines in rows one and two clear those rows from this box. The nine in column one clears its lower-left cell. Only these two places remain. Now look just below the box. This cell sees the first place by column. It sees the second diagonally, because a king cannot repeat a digit one step away. Whichever of the two box cells holds nine, this cell cannot. Remove nine here. The cell beside it loses nine for the same reason.
