There is a number of pseudobulbs, below which you shouldn't divide. Can't remember what it is, but if it is 5 then you shouldn't split a plant that has less than 10. The article went on to say that if you just snip off a pair of pseudobulbs, then if it didn't die, it would take a very long time to get back up to speed.
They also showed how to divide. You don't uproot the plant, you just sever the horizontal rhizome, dust the cut with fungicide, and slip a thin bit of plastic between the cut so it doesn't rejoin. I suppose you could make two cuts a 1/4 of an inch apart, which would make it easier to get the plastic strip in place. Then repot the following year when it is safe and the roots are beginning to grow.
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