Run a pair of coupled Markov chains on bumpless pipe dreams, starting from w=id and w=wo. When the chains meet, the result is a uniformly sampled BPD. Click or shift-click cells for manual operation.
Warning: with "reduced" checked, the coupled Markov chains run on reduced BPDs only, but they yield be a biased sample!
Thanks to Vadim Gorin for a helpful discussion about BPDs and ASMs!