I found myself in this position as Black. I played Kb6, but the engine on chess.com suggested that the move Kb7 is a missed win, and the continuation below would have been winning for me. It gave no lines beyond what is below, and I can't see how this is a win for Black. Is this a fault with the engine, or is there some line that I've completely missed?
[Title "Unexplained"] [FEN "2b2r2/2p5/p1kb2qp/1p1p4/3P4/7P/PP1BQPP1/RNR3K1 b - - 0 1"] 1...Kb7 2.Qe3 Rg8
In response to comments questioning if I have the position wrong or missed a root, I confirm I was a full rook down and felt this was a completely lost position. I have now included a screenshot demonstrating the strange opinion of the engine at chess.com
I guess it's a bug with the engine then?