this is a position whr opposition's king is only able to move

In chess, there is no limit to how many opposition pieces can be taken by one piece - although, neither sides' King can be taken.

The word 'chess' is a singular, uncountable noun. Units of chess are expressed as games of chess tournaments of chess.

Chess matches; chess boards; versions of chess.

Yasser Seirawan has written:

'Winning chess strategies' -- subject(s): Chess

'Winning Chess Endings (Winning Chess)'

'Winning chess brilliancies' -- subject(s): Collections of games, Chess

'Competitive chess for kids' -- subject(s): Chess for children, Juvenile literature, Chess

'Playing Winning Chess'