# What is a Checkmate Word™?

This is in the spirit of the What is a Word/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles.

If a word conforms to a special rule, I call it a Checkmate Word™.

Use the following examples below to find the rule.

And, if you want to analyze, here is a CSV version:

Checkmate Word™, Not Checkmate Word™
ABBEY,MONASTERY
RANK,FILE
BROOK,STREAM
QUARRY,MINE
IN,OUT
ERROR,MISTAKE
REQUIRE,REQUEST
KINE,COWS
BARRIER,OBSTACLE
BANK,MONEY
BONE,SKULL
REAR,FRONT
ROOK,PAWN
QUEEN,BISHOP


Note: This is my first puzzle of this kind, so it may not be well-worked.

The majority of the consonants in the word are from the set $$B,R,K,N,Q$$ - the letters representing the major chess pieces.
If we count $$Y$$ as a vowel (semi-vowel) then all of the consonants in the word are from this set.