TYPE 1 PROHIBITED LAMP(S)

Type 1 Prohibited Lamp(s)

There are three strategies which can be used to identify cells which are not permitted to contain a lamp (Prohibited Lamp cells). This is the simplest of those strategies.

The two cells highlighted in blue draw your attention to the pattern cell containing a 2. This cell requires 2 lamps and closer inspection reveals that it already has its complement of 2. Consequently, the two highlighted cells may be designated as Prohibited Lamp cells.