checkmate delivered by a knight when the king's mobility is restricted by his own pieces.
Righto, It’s British Slang, Mate!In the interest of improving diplomatic relations, and avoiding awkward moments, we've put together a list of some slang terms from the United Kingdom. A quick warning: there will some strong language and adult content ahead.
Origin of smothered mate
First recorded in 1815–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for smothered mate
chess checkmate given by a knight when the king is prevented from moving by surrounding men
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012