Where I can check my Fog of War win rate?

I know where I can see how many Fog of War games I played but I couldn't filter and see how many games I won. Where I can check my win rate?

I don't think they have statistics developed for the variants.

You can check your Fog of War win rate by following these steps:
(1) Going to the "Archive" tab in the variants server
(2) Type your username into the Username field
(3) Type "fog" into the "Game title" field (Note: For other variants, do the same thing with a different string here for that game type)
(4) Select a time period in which you have played <1000 games (e.g. "All Time", or if you've played >1000 games then some lesser period).
(5) Click the green down-arrow button to expand more options
(6) Change the "Game result" to "won"
(7) Check the number of won games in the top left next to the username field.
(8) Change the "Game result" field to "any result" (or "lost" + "draw" if you have a nontrivial number of "aborts"), then calculate the win rate from the resulting statistics.
In my case, my Fog of war win-draw-loss record in the last 31 days is 768-2-176 giving a win rate of 81.4%. (I'm a top 10 player and try to play the highest rated player as I can.)