Thank you. 2 things-
1) When Lot 1 is adjusted by $200 (goes from $100 gain to $100 loss), it should also become a wash sale, right, and that $100 would adjust Lot 3?
2) But if you had another, earlier Lot 0 - same # of shares bought and sold on 5/15/20 for $50 gain- would Lot 1 become a wash sale and apply $100 to Lot 0 (now $50 loss). In this case, I presume the chain would end there because Lot 3's purchase date is more than 30 days after Lot 0's sale date.
