Answer:

mate

Answer	Crossword Clue
MATE	Problem for a king
MATE	Bud
MATE	... in three (chess challenge)

MATE	Each animal in Noah's Ark had one
MATE	Game's end
MATE	Chess ending
MATE	Half of a pair
MATE	Another end of a chess game
MATE	Ninth word ...
MATE	Dating service success
MATE	Australian friend

MATE	Impossible chess ending with a king and knight versus a lone king
MATE	Winning move
MATE	Chum
MATE	Kiwi's companion
MATE	Chess finale
MATE	Australian pal
MATE	Aussie's buddy
MATE	Canberra chum

MATE	Counterpart
MATE	Running ...
MATE	9-Across ending
MATE	Partner
MATE	Outback buddy
MATE	Crew member
MATE	Pal
MATE	Final check

MATE	Spouse
MATE	Deck officer
MATE	Bloke
MATE	Chess player's cry
MATE	Captain's aide
MATE	Game-ending word
MATE	Pal in Sydney
MATE	Certain game ending

MATE	What a stocking needs
MATE	Wife
MATE	Pal from Down Under
MATE	Game ending
MATE	One of a couple