Yep! That’s exactly the one. Nice find!
I remember sometimes just spending a chunk of time studying that thing and finally starting to see how different forms connect together. It didn’t help necessarily with more advanced forms like the conditional えば – that’s where BunPro really helped to introduce things in a more step-by-step way – but at least knowing that they existed and ‘had a place’, so to speak, in the world of Japanese grammar was very helpful for ‘priming’ me to learn them once I got around to them in BunPro.
One of the things I liked the most out of it was how it split the columns up by ending sounds (mostly the vowel sounds, plus the Te form), which allowed me to make up some helpful mnemonics for the different cases/purposes once I started to learn them in BunPro.
For example, I worked out a mnemonic for learning the differences and how to conjugate between Passive, Causative, and Passive-Causative, when it came to that, and now that i have the mnemonic, I can usually figure out the differences pretty consistently.
It’s a long mnemonic (kinda like a story, actually), so I won’t spell it out here; but the main point is that it uses the soundings of the endings to rhyme with some English words/made-up-phrases so I can tell if I need to “pass a rare rumour”, or “cause a saucy rumour”, or “passively cause a saucy rare rumour”. Wrote a post about it somewhere a while back, either here or on the WaniKani forums.
Anyway, I would have had a hard time putting that all together if I hadn’t had that chart with all that info condensed all into one place for me.