All positions should have exactly one king for each side. No more than 8 pawns per side, no pawns on the first or eighth ranks, both kings can't be in check, and the player not on the move can't be in check. One side to move with no legal moves probably won't work, but not sure.
Pretty much anything else should probably work.
@Martin_Stahl
Cool, thanks for the info!
@Martin Stahl.
I experienced the same problem after I started using an iPad 7th Gen. I never experienced this problem when using my iPad Mini 2.
I like to use the custom setup to solve text book problems. If I inadvertently place an extra piece on the board (i.e. 4 pawns instead of three) and try to remove the piece by sliding it off the board, it seems to work, but I get the “invalid position” error when I select Start. I am able to move pieces around on the board, but the app is very unforgiving if you try to remove a piece.
Does anyone know whom to contact at Chess.com?
I just got the exact same problem, bur I can't find why it's not valid. None of the kings are in check, so it should be working.
All positions should have exactly one king for each side. No more than 8 pawns per side, no pawns on the first or eighth ranks, both kings can't be in check, and the player not on the move can't be in check. One side to move with no legal moves probably won't work, but not sure.
Pretty much anything else should probably work.
then how can i do this: 
All positions should have exactly one king for each side. No more than 8 pawns per side, no pawns on the first or eighth ranks, both kings can't be in check, and the player not on the move can't be in check. One side to move with no legal moves probably won't work, but not sure.
Pretty much anything else should probably work.
then how can i do this:
You posted on a 5 year old topic. Things have changed since then.
try changing the colors where you put the black piece instead put the white and vice versa. Worked for me
i try on browser and i still dont know how to do this, it says invalid and resets the board, not to mention i cant 3ven do it vs a bot. the only setup options are standard and chess960 or whatever it called
I followed all the rules for custom, no more than 8 pawns, no kings in check, no pawns in 1st or 8th rank, one king for each wide, no player not on the move being in check. Wtf is happening?
All positions should have exactly one king for each side. No more than 8 pawns per side, no pawns on the first or eighth ranks, both kings can't be in check, and the player not on the move can't be in check. One side to move with no legal moves probably won't work, but not sure.
Pretty much anything else should probably work.
I hate the no pawns on the 1st/8th ranks rule it should be fixed i have a crazy puzzle with that
All positions should have exactly one king for each side. No more than 8 pawns per side, no pawns on the first or eighth ranks, both kings can't be in check, and the player not on the move can't be in check. One side to move with no legal moves probably won't work, but not sure.
Pretty much anything else should probably work.
I hate the no pawns on the 1st/8th ranks rule it should be fixed i have a crazy puzzle with that
The rules of chess don't allow that.
How can I bypass invalid position
why is nobody joining my custom game? It's valid. It looks super fun and It's better than the old salty normal games. So why is nobody joining it?
All positions should have exactly one king for each side. No more than 8 pawns per side, no pawns on the first or eighth ranks, both kings can't be in check, and the player not on the move can't be in check. One side to move with no legal moves probably won't work, but not sure.
Pretty much anything else should probably work.
I hate the no pawns on the 1st/8th ranks rule it should be fixed i have a crazy puzzle with that
The rules of chess don't allow that.
why is nobody joining my custom game? It's valid. It looks super fun and It's better than the old salty normal games. So why is nobody joining it?
ask people in a club to join, might I recommend some good clubs for that?
oh ok thanks and also yes i would the names of 3 clubs pls
oh ok thanks and also yes i would the names of 3 clubs pls
https://www.chess.com/club/the-great-and-extraordinary-chess-club (I invited you to that one)
https://www.chess.com/club/the-mark-mental-asylum
https://www.chess.com/club/royal-evil-cats-layottu (I also invited you to that one)
Guys, this error message just popped on one of my longest studies, on which I spent more than 6 hours analysing and saved for posteriority. Now I can't even open it. Any tips? Would be horrible having to do everything over again, cause there was even a lot of commentary and explanations...
I got the Chess.com app barely two days ago, so I apologize if there is a glaring solution to this... I’ve been tinkering with the app just trying to get a feel for how it works and I’d discovered the custom positioning option when playing with a computer which seems like it could be very fun, however almost any variation I lay out gives me the message “invalid position” and will not let me play! The only time this does not happen is if I make a very minute change like flip the king and queen, make a power piece a pawn and vice versa, etc... I’m certain this is simply me not understanding some rules, so I guess I’m just asking if somebody could explain some of it to me. Thanks!