I think i know why #5816 is illegal:
Black is missing 2 bishops, 1 queen and 1 pawn.
White has 5 pawns on different files than they started on (b3, b4, d3, g3, g4).
They can only have gotten there by capturing stuff.
There is too much black material still on the field to have made 5 captures possible, hence it couldnt have been reached.
This is a pretty good one because it's not immediately obvious that it's illegal. The triangle a2-a6-e2 contains only five pawns, and Black only needs three captures to produce the tripled pawns, so we know both sides' pawn formations are legal given enough captures, so why is the position illegal? It's a good question for DefenderPug2 to try answering.
I think i know why #5816 is illegal:
See #5841 for a simple illegality proof of #5816.
What…..
It looks like it may be time for the trolls to stop by again. They haven't been here for a while, and the best response to trolls is to ignore them. So don't bother with #5861. Instead you should concentrate on posting a valid illegality proof for #5857.
Find the illegal stuffs.
What do you mean by "illegal stuffs"? The position is easily legal.
Check out my “friendliest position challenge” thread. I think it’s cool
Does it include a definition of what makes a position friendly?
Check out my “friendliest position challenge” thread. I think it’s cool
Does it include a definition of what makes a position friendly?
Yes
Check out my “friendliest position challenge” thread. I think it’s cool
Where is it?
Check out my “friendliest position challenge” thread. I think it’s cool
Where is it?
I’ll send link
Check out my “friendliest position challenge” thread. I think it’s cool
Where is it?
https://www.chess.com/forum/view/off-topic/friendliest-chess-position-challenge
I made a knight do a backflip…..
That's nothing. They do that legally.
Pawn on e2 shot Knight on g8 with a sniper rifle.