The rule is about squares having a certain relationship with their neighbors vs. it is not.

The similar solution "Each square can be deduced from its neighbors vs. not so" does not quite work; for example EX8114 would then not fit left. See also BP1258 ("Each square can be deduced from the rest vs. not so").

For clarity, rules involving diagonal neighbors or squares more than one step away are never used.

The rule is about squares having a certain relationship with their neighbors vs. it is not.

A more precise answer would be "Each square can be deduced from its neighbors vs. not so." See also BP1258 ("Each square can be deduced from the rest vs. not so").

For clarity, rules involving diagonal neighbors or squares more than one step away are never used.

The rule is about squares having a certain relationship with their neighbors vs. it is not.

A more precise answer would be "Each square can be deduced from its neighbors vs. not so." See also BP1258 ("Each square can be deduced from the rest vs. not so.")

For clarity, rules involving diagonal neighbors or squares more than one step away are never used.

Local rule vs. global rule.

The rule is about squares having a certain relationship with their neighbors vs. it is not.

For clarity, rules involving diagonal neighbors or squares more than one step away are never used.

Aaron David Fairbanks