 |
This is
similar to a COLORS technique except
that it involves identical bivalue cells.
When a puzzle contains multiple matching naked pairs, they can be colored in a
alternating fashion as shown here. As a result, either all
of the red candidates are true or all the green candidates are true.
Any cell that is visible to two alternately colored cells becomes a
target. A candidate that can 'see' a matching red and green
candidate can be removed.
(These bivalue cells also form two X-chains
and two XY-chains (you can ignore cell
r9c5). But the remote pair is much easier to spot and it
eliminates two candidates at once)
|
|