I use something essentially the same as Hannes’s system (I based mine on Part I of Lance Tschirhart’s Shadow System, but I believe Hannes’s is the exact same just with slightly different phonetics). It needs 1352 images though, not 1000. I can’t think of any reasonably simple way to have a 2-card system with only 1000. And I know for a fact that Hannes uses 1352 images. He might have used that “3 cards = 2 images” system a while back, but for the last few years at least he’s used a 1352-image system. But the great thing is, 1352’s really not that much more than 1000…
Lance’s Shadow System: (I used Part I and the first bit of Part II where he talks about Mallow’s system)
Some comments by Hannes himself (found here on the forums in the Speed Cards thread):
"I use a Double-Card System with consonants. But only with 1352 images instead of 2704. I was always too lazy to create a real big system so I use that trick:
Every image works for two different card combinations. So for example Kd-8c has the same image as Ks-8c. This gives you two blocks of 1352 combinations.
If I memorize cards I put images on one location and make up a story as long as combinations from block 1 appear. If a combination from block 2 appears I put it on the actual location but then move to the next one and start again with process. So I have a different number of images on each location
This gives me all information I need."
I do the exact same thing, with all my block 2 card-pairs being red-first (diamonds or heart as the first card), and all my block 1 pairs being black-first. I like it because it’s kind of like having a built-in STOP sign. You see a red-first pair, you stop there and move on to the next locus.