Climbers: There are 5 drop-down controls, each fully populated with all climbers registered at Peakbagger.com. If you are a registered user and you are logged in, you will appear at the top of the drop-down lists. If you have identified others for your Buddy List, those climbers will appear next in your list. If there is a climber you will be comparing often, it makes sense to add them to your buddy list.
Also, every climber’s home page has a link to the Compare page with that climber pre-selected as Climber #1 for the Comparison.
List: You can select any official list in this dropdown. The order is the same hierarchical order used by default in the main List Page. Instead of using this drop down, you can navigate to any individual list page on this site and there is a “Compare Climbers” link at the bottom of the page that will take you to the Compare page, with the list automatically populated.
There is also a special list at the top of the List drop-down called “All Peaks Climbed by Selected Climbers”. Selecting this list will first calculate (behind the scenes) a list of all unique peaks climbed by all climbers selected in the climber drop-downs. Then it will compare the climbers against this entire list. For comparing several climbers with hundreds of ascents, this can generate a very large list and take a long time.
Show Drop-Down: This will only show peaks that a certain number of climbers have climbed. For example, if you are comparing 3 climbers across a list with 50 peaks, and none of the three have ever climbed 20 of those peaks, selecting the “Peaks with three or more ascents” will yield a comparison of only the 30 peaks that someone has climbed.
Unranked Peaks on List: Many lists have peaks that for various reasons (such as insufficient prominence) are not officially ranked. Select “Hide Unranked Peaks” to remove these from the comparison.