Updated data from 10th of May to 6th of June is

here.

Some things i've tested so far, using elo cutoff = 2200 for both players:

Is ZK just a game of Tank-K at high level? (my expectation: "winrate slightly over 50%")

Tank games: 134
Tank wins: 75
Win percentage: 0.5597014925373134

Seems fine, Tan-K stronk! But what if we remove mirror? (all further data is with mirrors eliminated)

factorytank games: 109
factorytank wins: 50
Win rate: 0.45871559633027525

Huh!?

Okay, so what's pwning tank?

Matchups:
Matchups:
vs factoryveh: 50 battles, 22 wins, ratio 0.44
vs factoryshield: 14 battles, 7 wins, ratio 0.5
vs factorycloak: 15 battles, 8 wins, ratio 0.5333333333333333
vs factoryamph: 4 battles, 1 wins, ratio 0.25
vs factoryjump: 9 battles, 3 wins, ratio 0.3333333333333333
vs factoryspider: 3 battles, 0 wins, ratio 0
vs factoryhover: 8 battles, 3 wins, ratio 0.375
vs factorygunship: 5 battles, 5 wins, ratio 1
vs undefined: 1 battles, 1 wins, ratio 1

Cloaky and Shield are surprisingly even, gunships predictably lose. Hover, Rover and Amph are favored against Tank.

Okay, maybe Tan-K doesn't survive in the chilly heights over 2200 elo.

So what about the next contender, Amph-K with the horrible Archers and Grizzlies?

factoryamph games: 39
factoryamph wins: 22
Win rate: 0.5641025641025641
Matchups:
vs factoryshield: 6 battles, 1 wins, ratio 0.16666666666666666
vs factorytank: 4 battles, 3 wins, ratio 0.75
vs factoryhover: 3 battles, 2 wins, ratio 0.6666666666666666
vs factorygunship: 7 battles, 6 wins, ratio 0.8571428571428571
vs factorycloak: 9 battles, 6 wins, ratio 0.6666666666666666
vs factoryjump: 3 battles, 2 wins, ratio 0.6666666666666666
vs factoryveh: 6 battles, 2 wins, ratio 0.3333333333333333
vs factoryspider: 1 battles, 0 wins, ratio 0

This is looking like a much nastier threat to the world balance, hmm. Amphs are still quite unpopular though, and in this data they lose to rovers and shields. Speaking of rovers, how do these fare?

factoryveh games: 100
factoryveh wins: 59
Win rate: 0.59
Matchups:
vs factorytank: 50 battles, 28 wins, ratio 0.56
vs factorycloak: 12 battles, 7 wins, ratio 0.5833333333333334
vs factoryshield: 9 battles, 4 wins, ratio 0.4444444444444444
vs factoryhover: 8 battles, 5 wins, ratio 0.625
vs factoryjump: 11 battles, 7 wins, ratio 0.6363636363636364
vs factoryspider: 3 battles, 3 wins, ratio 1
vs factoryamph: 6 battles, 4 wins, ratio 0.6666666666666666
vs factoryplane: 1 battles, 1 wins, ratio 1

.... it has been Rover-K all along???