Assertion: puzzle's solution | /r/HasProperty | equivalent
Facets:
value: to its 90° rotation
type: OTHER
value: to its own reflection
type: OTHER
Source sentences:
text: However, should a solution be equivalent to its own 90° rotation (as happens to one solution with five queens on a 5×5 board), that fundamental solution will have only two variants (itself and its reflection).
text: Should a solution be equivalent to its own 180° rotation (but not to its 90° rotation), it will have four variants (itself and its reflection, its 90° rotation and the reflection of that).
text: If n > 1, it is not possible for a solution to be equivalent to its own reflection because that would require two queens to be facing each other.