You have to edit FEN4, there is a string 'lives' that stands for the checks per player
How can you make different numbers of checks in a WoF or NCV?
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Jul 29, 2021
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#3
Start by going to the analysis board (a few ways of doing this: the simplest way is to click the board and type the "a" key, but you will need to enable keyboard shortcuts for this)
Head over to the "Edit Position" Tab.
Then, click on the "N-Check" drop-down menu and click on any value, as the process is the same for all of them.
As you can see above, as @BsrtiTheChallengerCW mentioned, there is a new string called "lives" which stands for the number of checks, or "lives" that each player has before they get checkmated. You can edit the four numbers to anything you want from 1 to 999, inclusive. Even decimals and fractions!
You can also do this in the PGN4 editor:
How do You make a bot have a certain number of checks while the players have a different amount of checks, (E.G DIY Maze), or the players have different number of checks to each other? (E.G Thermopolyae.)