photo finish vs stalemate

photo finish

noun
  • Any competition with a very close outcome. 

  • The finish of a race in which the leaders are so close together that the winner cannot be identified using the naked eye but is determined by means of a photograph. 

stalemate

noun
  • Any kind of match in which neither contestant laid claim to victory; a draw. 

  • Any situation that has no obvious possible movement, but involves no personal loss. 

  • The state in which the player to move is not in check but has no legal moves, resulting in a draw. 

verb
  • To bring about a state in which the player to move is not in check but has no legal moves. 

  • To bring about a stalemate, in which no advance in an argument is achieved. 

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