Simple past tense and past participle of stalemate.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "stalemated" in a sentence
"In this game, two players take turns accumulating points by capturing tokens while avoiding being "stalemated"."
"General David McKiernan [US Commander in Afghanistan] recently described the war in Afghanistan as "stalemated" particularly in the Southern parts of the country."
"The top U.S. commander in Afghanistan offered a grim view Wednesday of military efforts in southern Afghanistan, warning that 17,000 new troops will take on emboldened Taliban insurgents who have "stalemated" U.S. and allied forces."