Stuff you did when you first started playing poker...

[Talking Poker]

This must be someone's actual win rate using a far too small sample. Obv, it would greatly depend HOW these hands are played that would lead to the results, but that's my guess as to where it came from.

And while this chart is pretty terrible, I actually think a beginning player who took the initiative to look this up and attempt to use it probably could learn something (about preflop hand strength only) before realizing the chart is crap and throwing it away.