# Tagged Questions

Retrograde analysis is the method of solving for optimal play by working backwards from a given position or outcome.

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### Least amount of moves to achieve a position

During a comp, my friend an I had a team kill and we decided to make this position(legally) before drawing. Then we continued to find more and more optimal ways of getting the position until I found ...
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### Prove that white is not allowed to castle here

A friend recently gave me the following weird chess problem to solve, and I'm afraid I'm struggling to see the key ideas, that would ultimately count as proof. From the position, intuitively speaking ...
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### How is this retrograde analysis position legal?

On his page on Harry Goldsteen's "horse concoction", Tim Krabbé gives this position by "N. Höeg, 1935": With the stipulation "add 10 white rooks; black mates in 1". He then claims that "Retrograde-...
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### Retrograde analysis of chess in The Flanders Panel by Pérez-Reverte

Have anybody tried to verify retrograde analysis of a chess game in The Flanders Panel by Pérez-Reverte? So far I have found only reconstruction of the board in this post: http://bibliophilicnightowl....
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### I can't do Retrograde Analysis

Why is it hard for me to play Retrograde Analysis? Ex. I want to take their queen, but I don't know how can I get to specific back steps, unless I play normally(would take time).
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### How to compose retrograde analysis problems?

Are there any books or articles devoted to composing retrograde analysis problems? It seems that you would need some techniques beyond ones for standard problems.
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### Can it be proven that 11. 0-0-0+ is legal in this position?

Because the chess site this was on takes its puzzles from real games and gives the move numbers, potential solvers knew that the following position was reached after exactly 10 moves by each player. [...
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### Puzzle rebus. Reproduce the game

There is a chess "rebus" puzzle: In this position white circles correspond to white chess pieces, black - to black. Each letter corresponds to exactly one piece type (king, queen, rook, knight, ...
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Raymond Smullyan wrote some great books with Retrograde Analysis chess puzzles. I know of two, are there others?
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### Puzzle. Find color of the pieces

Please help me to find solution of the next puzzle: Colours of the pieces on the diagram is unknown. The diagram can be obtained in a game. One needs to find colour of each piece: Black or White. ...
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### Is there retrograde analysis puzzle like “Point on the incorrectly drawn chess piece”?

Does anybody know a nice chess puzzle, where question states: "Exactly one piece is drawn incorrectly on this diagram, another piece must be drawn on it's position. Find incorrectly drawn piece."? One ...
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### Puzzle: Find White's second-to-last move

For the following position to occur in legal play, with Black on move, what would White's second-to-last move need to have been? Note that Black is checked by two pieces on the h1-h8 file and two ...
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### Puzzle: reconstruct the game

In the following position, each side has made exactly 4 moves (8 in total). [fen "rnbqkbnr/pp3ppp/2p1p3/8/4P3/8/PPPP1PPP/RNBQK1NR w KQkq - 0 1"] I need to find what these moves were.