How to trade it further if you have not yet enterred the 1855-1860 break initially yesterday, or have not yet bought any put options? If we are lucky, with some bulls denial and some early short closings 1840 will try to hold first, and then we can see a pullback to 1855-1863 levels. This scenario has some chance looking at low level. After the huge drop, Europe might show some correction today as well, giving US bulls a little last confidence to attack. If you see this possible trap, use this opportunity to SELL first units. Later as trend pick up confirms, sell on any retest, with trailing stops at Kijun + Buffer or 100 + buffer. If you fear 1840 breakdown will hapen earlier (missing the pullback) then buy ATM (or slightly OTM) Puts for April maturity.
(Summary: Short 1855-1863 / Initial Stop at 1876 / 1st tgt: 1810)