title: What is a good heuristic for dealing with obstacles?
body: <p>Let's say we have a person trying to walk from east to west, but a north-south wall is in the way. Let's also say that the wall is longer north than it is south (relative to the person). What options are there to receive the best possible heuristic values, and make sure he walks towards the south end of the wall instead of the north?</p>
  
  <p>Thank you.</p>