2020_Iowa_Democratic_caucuses
WP were always going to be a clusterfuffle.
tl;dr - The process is as follows...
3 Feb: "11,402 county convention delegates are awarded proportionally on the basis of the results of the 1678 precinct caucuses and 99 satellite caucuses."
21 Mar: County convention delegates select 2,107 District and State Delegates (SDE) for district conventions
25 Apr: District conventions select the 27 pledged congressional district delegates
13 Jun: State Democratic convention selects the remaining 9 pledged at-large delegates and 5 pledged PLEO delegates
When it's all said and done more than 152k Iowans have been gradually compressed down to 41 pledged delegates to the DNC through an iterative process with multiple stages, at each of which various candidates' shares have been rounded up, down, or zeroed out.
tl;tl;dr - If you were confident in this process, you didn't understand it.
ETA: It looks like Pete might have a decent shot of getting the most SDEs, but he's in a virtual tie with Bernie.