Is “Checkmating” a Scrabble word?
Yes
CHECKMATING
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Checkmating
verb
1.To put the king of an opponent into checkmate.
“That jerk checkmated me in four moves!”
2.(by extension) To place in a losing situation that has no escape.