[TITLE "chess position from The Flanders Panel book"]
[FEN "1nb5/pp1p4/PRP5/pR6/k1K1P3/2P5/2qP1P2/1NrnQB2 w - - 0 1"]
For the retro logic in the "The Flanders Panel" to work, there are two assumptions required: (1) there were no promotions (2) the black queen was royal, i.e. could not have been left exposed to attack. The solvers also assume that it was Black who moved last: perhaps there is some clue mentioned in the painting (e.g. Ferdinand of Ostenburg pushing the chess clock :D). If you accept those conditions, then the retro logic works out OK, in what is a well-written & atmospheric historical thriller.
It is so much better than the corresponding composition in the movie of the book, renamed "Uncovered", and starring Kate Beckinsale. The diagram is:
[TITLE "chess position from Uncovered movie"]
[FEN "2n1r1k1/bQ2p1r1/p4p1q/6pp/1P5P/R5PK/2BR4/4N3 w - - 0 1"]
The retroanalysis is simply bonkers, but most of the analysis concerns the forward play, in what is initially a balanced position, but which is thrown away by the "expert" player representing White in a series of moves not much better than those in "Alice Through the Looking Glass".
The total blunder 1.Ra5? is played in the movie (Stockfish prefers 1.Qd7!) 1...g4+! 2.Kh2! Qxd2+! 3.Qg2? (3.Ng2!) 3...Qxb4? (3...Qxe1!) 4.Qc6? (4.Ra1!) and Stockfish rates the position -9.9.
In one of the chess scenes (in the park) the diagram position is actually wrong, with bKa8 instead of g8, and wQ missing!
Amazing that in a movie which is ostensibly about a chess position, that no-one bothered to invest $50 in a competent chess player to sort the thing out properly!