I'm not sure why but women seem to never really play open guard. Leticia played a little but almost all the women, loved closed guard.
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The problem with absolute statements, is that they are usually wrong.
There are 67 throws (not counting any varitions) in the Judo syllabus, less than a 3rd of those throws expose your back to your opponent. There are many throws that are used in BJJ by high level guys. Many BJJers cross train Judo in Brazil (Brazil usually has a good showing in Judo at international events).