The double diagonal is a combination of a diagonal call spread and a diagonal put spread.
You can use it if you expect little volatility before the near expiry. At the near expiry, if the market is still between the strikes or the two near expiry options, you can convert the double diagonal into two vertical spreads.
See also diagonal call spread, diagonal put spread, bull calendar spread.
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The screenshot shows the following portfolio:
European call struck at 10.000 with expiry in 30 days
European call struck at 11.000 with expiry in 90 days
European put struck at 9.000 with expiry in 30 days
European put struck at 8.000 with expiry in 90 days
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