IRV example where voting for somebody makes him lose

#voters

their vote

9

A>B>C

6

B>A>C

5

C>B>A

In IRV, C has the least votes and hence
is eliminated, and her votes transfer to B, so B wins over A.
However, if two A>B>C voters had voted C>B>A (maximally dishonestly –
completely reversing their
preference order to lie as much as they could possibly lie),
then:

#voters

their vote

7

A>B>C

6

B>A>C

7

C>B>A

B has the least votes and is eliminated, giving her votes to A, and A wins.
So voting against your
preferred candidate here increases his chance of winning!

This example was posted on the net by somebody named "The Phantom."
I liked it so I reposted it here.