I am well schooled on Greys from HLSH, as long as there is
volume, you can trade fairly close to whatever the B/A may be by watching the last sale. Selling at the open on Monday will
be a huge mistake, unless this opens close to the EOD close, before it was suspended. IMHO.
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just use whatever you normally use. The date will feed more roundabout, but you'll be able to see trades that execute (ie, "Last").