The best replacement for checkmate is stalemate.

The best alternatives to checkmate are rated as following:
★★★★★  stalemate
★★★  baja
★★  check
★  kid muscle
★  donzi
★  hydrostream
★  checkmate
★  techtool pro
  watchdog
  check mate
  fountain

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Speaking about checkmate, one probably shouldn't forget about checkmate.

Other search terms related to checkmate and their ratings are:
★★★★★ checkmate
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Google Trends

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checkmate
stalemate
baja