Guess the Graph

[onigame]

Comments

[hot_soup]

It's hard to not think of chess here. Probability of each piece surviving to the last move of the game, averaged some database of chess games?

b*

[ext_272616]

And color relates to the probability of that piece issuing the checkmate?

[kosai]

The color is just a visual aid showing the probability -- lower probability, darker color. (And your guess would suggest that rooks issue checkmates less often than knights, which sounds wrong.)