It’s not meant to be exaxt. It’s just general proof.
Is this position legal?
Sort:
Bishop-theme position!
#1626-Illegal, as the white bishop on a8 couldn’t have captured a piece to deliver mate from where it stands, making black king illegally in check/mate for at least one turn.
Still illegal!!
How about a black bishop or queen? I tried to make a legal sequence with the white oawn caputrijg but it just ends in stalemate before the white pawn promotes.
How come you’re in USA but you don’t have good English?
Because I suck at typing on an Ipad at times, and I’m also too lazy to double check at times as well.
You are very wrong. It is legal. See the links I provided in my answer. They are exact but they still are proof.
And I’m the guy who made those 10 rooks, 10 bishops, and 10 knights games! 
Yep. I’m deep into stuff like that. Chess Stack Exchange has a lot more like it!
Haven’t really tried puzzles too much, but I make them for Puzzling Stack Exchange. They are chess themed of course.
It’s fine to call the, weird!
They either source them with sources included (to avoid plagiarism) or make them up themselves.
There’s quite a variety.
Это позиция верна или нет?
Use Google translate. He’s asking if it a legal position,
Answer in white text, below:
Legal.
First link: Black is missing a Bishop.
Second link: Not the position (one less dark square Bishop, one more light square Bishop)