I counted 26 different variations on the flames around the outside.  I only found a couple that are split.  Maybe they are supposed to be middle.

inner color / outer color
Tall or short
inner flame (left curl/middle/right curl/split)



Again this has something to do with the 1886 Chess game that ended in 17 moves played by bird.  (17 leaves on the vine)


The game is called "Bird without a nest".