0DTE Update, Sept 26, No. 1 -- 6650 looks achievable, but massive resistance kicks in at that level; however, watch out if it breaks!
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SPX Sits Below Massive Positive Gamma Resistance Wall at 6620-6640; line of least resistance is very soft support below 6600 all the way to 6545
If SPX 6620 gives way, there's no support until 6600 -- and even that is mighty thin
Update (0DTE) No. 1 : If you are long SPX, exit trades ASAP (ideal=6755) -- ocean of negative Gamma morphed into lake of positive Gamma
