Assertion: pure mate | /r/HasProperty | a checkmating position
Facets:
value: in chess
type: LOCATION
Source sentences:
text: A pure mate is a checkmating position in chess in which the mated king and all vacant squares in its field are attacked only once, and squares in the king's field occupied by friendly units are not also attacked by the mating side (unless such a unit is necessarily pinned to the king to avoid it interposing to block the check or capturing of mating unit.