Ok... Erm let me answer that question above then...
Since I think it's abit difficult..
When there are two rhievess left, the last thieves will be left with nothing. Let's illustrate by using numbers. The smaller the number, the lower the ranking:
Thief 1 and thief two is left.
So thief 2 will suggest that he get all the 100 gold. Whether or not thief 1 agrees makes no difference to the outcome since thief 2 will surely agree, making it 50% agree.
So thief 1 will never allow that to happen. In this case, any amount of gold will prompt thief 1 to agree to the plan.
Thief 3 will use this to his advantage. So... Continue from here