Inequality Chain
Intermediate Places a digit Used in: Futoshiki
Follow the greater-than and less-than signs linking a run of cells. Each sign caps how high or low a value can be; a long enough chain of “<” signs on a small grid pins exact values — four cells reading a < b < c < d on a 4×4 must be 1, 2, 3, 4.
How to spot it
A run of cells connected by greater-than and less-than signs.
What you can conclude
Each sign trims a cell’s range; a long enough chain fixes exact values.
Worked example
Four cells reading a < b < c < d on a 4×4 can only be 1, 2, 3 and 4 in order.