[EM] Approval Voting vs Instant Runoff Voting:

[LAYTON Craig]

>Right - and I can't see any case where saying you will vote A not AB 
>will cause B voters to vote AB. I'm sure such a case exists - but I 
>can't find it: hence my question at the end: can you provide one?

Poll with A voters voting AB

AB 30 (A>B>C)
B 30 (B>A>C)
C 40

B is projected to win with 60 per cent.

if the A voters say they will vote just A
A 30
B 30
C 40

B voters will vote AB to stop C from winning.