Subject: Re: Check Capital Management BRK Options Stragegies
Interesting: I contacted them and asked them if they were able to give a little more detail on their second strategy (not the covered call strategy) where they had significantly greater returns albeit with higher volatility.
They're doing debit call spreads: buy a call, sell a call at higher strike.

I didn't probe much more (although IIRC he said 'long-dated'), no doubt there's a limit to the info they'll give a cold caller.
But there you have it, that second program with the high returns (not the covered call one) is their strategy for debit call spreads on BRK.