[EM] MC -1, 0, 1 --- STV hybrid

[Chris Benham]

This is my first posting here. I have just composed  a very expressive 
(elect-one person) election method , and not as a joke.
Voters number  candidates in order of preference, and also mark 
candidates as Approved  and up to
number of candidates minus 2  as  Disapproved (or  Unacceptable).
1. A candidate who is ranked number 1 on more than half  the ballots wins.
2. If no result, if there is one and only one candidate who marked as 
Approved by the majority, then that candidate wins. If the set of 
candidates Approved by the majority has more than one member, then all 
non-members are eliminated and their preferences are transferred. If  a 
candidate now has a majority  then that candidate wins. If  not, then 
the numbered rankings are abandoned, and the winner is the candidate 
with the highest  Approvals minus  Disapprovals tally.
3. If  there were no candidates who were Approved by the majority, then 
eliminate all candidates marked as Disapproved by the majority and 
transfer their preferences  and proceed as before.
If  a candidate has a majority they win. If no result, then abandon the 
numbered rankings  and elect the candidate with the highest  Approvals 
minus Disapprovals score.
A vote with as little as just the number 1 or a single Approval or 
Disapproval will be valid. The restriction on the number of 
 Disapprovals is mainly to make it impossible for  all the candidates to 
be Disapproved  by the majority.
I  think  that there should be few strategy problems. I  am  interested 
in any comments, but I don't promise to (immediately) understand them.
               Chris Benham