checkmate vs overwin

checkmate

noun
  • The conclusive victory in a game of chess that occurs when an opponent's king is threatened with unavoidable capture. 

  • Any losing situation with no escape; utter defeat. 

verb
  • To place in a losing situation that has no escape. 

  • To put the king of an opponent into checkmate. 

intj
  • Said when one has placed a person in a losing situation with no escape. 

  • Word called out by the victor when making a move that wins the game. 

overwin

noun
  • The win or winning of a game. 

verb
  • To overcome; gain one's point; exceed. 

How often have the words checkmate and overwin occurred in a corpus of books? (source: Google Ngram Viewer )