Game depth

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Define game depth as the Elo difference between the human world champion and an average human player.
The Lasker trio understood the concept of game depth and they understood that go is deep.
By this definition,
Go 3262
Shogi 2200
Xianqi 1983
Chess 1631
Checkers 1240
Stratego 858
Tic Tac Toe 0
Rock paper scissors 0
Soccer 2600
Tennis 2400
Golf 2000
Alternate definitions exist, such as the Elo difference between the world champion and the world #128.
Does there exist a site with Elo ratings for fairy variants? Which variants give biggest depth?
Expanded math in https://jaymaron.com/fairychess.html