It's been used for single-member constituencies at the Federal level in Australia for 100 years, and in the various States for at least 50 years. French Presid

It's been used for single-member constituencies at the Federal level in Australia for 100 years, and in the various States for at least 50 years. French Presidential elections have been using run-off elections for even longer, and those are in theory open to the same kinds of tactical voting in the early rounds as IRV.