Math on the SBRs to see why 2 SBRs is exponentially more effective than just 1. It comes down to two factors:
First is that you need to first get his production down to the ceiling on which he would be producing for it to actually damage him. If you hit for 4 and knock him down to 6 and he’s only producing 6, you haven’t done a lick of damage. If you hit 8 and knock him down to 2, and he’s producing 6 units, he needs to buy back 4, and your SBR is half effective. If you knock him down lower (either on one run or successive runs), the percentage of effectiveness increases.
Second, for every troop he buys when his IC is down to 0, he needs to buy back 1. For every troop he buys when his IC is down past that, he needs to buy back 2. This makes two runs a lot more expensive for him.
Let’s say, if England’s IC never gets bombed, that he buys 8 inf, 1 art on UK1 and (with 35 IPC) 7 inf, 2 art, 1 tank on UK2.
Traditionally, with SBs clearing out 110 and 111, you have one SBR on G2 for an avg of 11. But he doesn’t need to buy back all 11. He only has enough cash for 2 tanks and 5 inf. In this example, there’s 3 he didn’t need to buy back. That’s a portion of the SBR that doesn’t hurt him. Compared to not being bombed at all, that’s a loss of 3 units for him.
With an SBR on G1, England’s IC is on avg knocked down to -1. That lets him buy 5 inf, 1 tank with his IPC back to +6. The second round knocks his IC down to -5. From there he can buy 5 inf, 2 art. That’s for a total loss of 6 units.
So, over the course of two rounds, UK can buy Or
With no SBRs: 18 inf/art, 1 tank (19 hits, 39 def) 12 inf/art, 1 tank, 2 figs (15 hits, 35 def)
With only a G2 SBR: 14 inf/art, 2 tanks (16 hits, 34 def) 10 inf/art, 1 tank, 2 figs (13 hits, 31 def)
With G1 + G2 SBRs: 12 inf, 1 tank (13 hits, 27 def) 8 inf/art, 2 figs (10 hits, 24 def)
In the right hand column I listed UK purchases that include some high profile units if he’s trying to minimize IC buyback. The actual configurations will change of course depending on the SBR damage, but that gives an example of its effectiveness. The less fodder UK has, the quicker you start eating into his valuable defense; sealion probability skyrockets. I don’t know how to factor the probability of SBs getting shot down into the equations, but I’m working with the assumption that it’s mathematically worth the risk.
If the SBRs don’t go well, you don’t have to sealion. But this isn’t at the cost of anything that isn’t at risk in traditional sealion other than the added risk of SBs getting shot down. But looking above at the numbers, that risk is worth it. So at worst, your sealion prospects are no better off than they would be otherwise. At best, you could hit him for up to 32, making his inf stacking pretty paltry. Also, don’t discount the 1 or 2 subs disrupting convoy in 109 for an avg of 2 each.
So let me flip the question around. Instead of trying to demonstrate why this is a good idea, let me ask any of you to explain to me what advantage you gain by sending your SBs to 110 and 111?