A pass is the low point of a ridge and the way across it. 99,028 of them here, with height, country and range; 11,879 carry a grade.
Up to 1,000 peaks go into one challenge. If the list holds more, the first 1,000 in the current order are taken.
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The passes come from OpenStreetMap, where a saddle a road crosses and a saddle a rope crosses are the same tag. So this section holds both: the drive-over passes of Norway, Spain and the Alps, and the snow cols of the Tien Shan and the Pamir that take a day to reach.
What tells them apart is the grade. The Russian scale runs н/к — no category, a walk — through 1А, 1Б, 2А, 2Б and 3А to 3Б, and it counts the hardest ground on the crossing: scree, snow, ice or rock, and what it takes to protect it. A star marks the hard end of a category, and a hyphen is two sources disagreeing. 11,879 passes here carry one, almost all of them in the Caucasus, the Tien Shan and the Pamir: the scale is a post-Soviet mountaineering idea and nobody grades the saddles of Norway by it. The slider leaves the rest in the list rather than hiding them.
Climbs of a summit are counted apart, in their own section, and the cabled routes in theirs.