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Questions tagged [retrograde-analysis]

Retrograde analysis is the method of deducing information by working backwards from a given position or outcome. This information can be about past positions of the same game, or may contain forward content, such as optimal play.

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Searching for a “where is the black king” puzzle?

Sometimes ago, a friend showed me a position where he had the black king removed. The goal was to find where is the black king using some pretty weird reasoning. I tried to remember the puzzle but I ...
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Can we say for sure Black's King has not moved?

The following position appears as the 7th puzzle of Raymond Smullyan's Arabian Knights, a book of retrograde analysis: [fen "3qk2r/p2pp1bp/bpp2n2/8/3N3Q/1PN1P1P1/P1PPP2P/3K1n2 w - - 0 50"] The ...
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What is the result? (Rules + puzzle)

[EDITED to include followup - EDIT 2 to include definition of position] This is in part a genuine question on the FIDE Laws of Chess, and in part a small puzzle to solve. Suppose that during a long ...
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Can white win in this almost 20 year old puzzle?

White to move. Can white force a win? (left bottom is a1 as usual) [FEN "4k2r/6p1/p4pKb/p2N3p/p7/p5Q1/p1n5/qrn5 w - - 9 9"] Note for people who saw an earlier version: the position was edited (...
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Way to Logically Predict Approximate Chess Rating in Pop-Culture Games [closed]

After seeing a video of an analysis on the chess game in A Game of Shadows between Sherlock Holmes and Moriarty, it made me wonder what their fictional ratings would be around. Other games like the ...
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Are there any legal positions known to be impossible to come to in a normal game? [duplicate]

There are some fairly obvious ways to set up a chess board that cannot possibly happen: both kings simultaneously in check would be one. There are some positions that seem impossible in a normal ...
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What is the maximum number of passed pawns in a position?

Something I want to know is the most number of passed pawns in a chess game that is theoretically possible. This reminds me of that famous 9 passed pawns game. Does anyone know? And if so, what is the ...
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Beautiful retrograde analysis problem by Alexsey A. Troitsky

I saw this beautiful, subtle & accessible problem a couple of days ago, and wanted to share it with you folks. (It's by the ground-breaking endgame theorist who e.g. invented the "Troitsky line" ...
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What was Black's last move?

White to move. What was Black's last move? And what could have happened before that?
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Prove color of pawn and position of knight

I was recently given a retrograde type of puzzle to solve, even though I've managed to at least intuitively get close to an answer, I don't know how to put it in the form of an acceptable proof. For ...
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“Knight rebus”. Decipher an encoded chess position

Here is a rebus: Each letter represents a different type of piece. Uppercase is one colour, lowercase is the other. Determine the position. If possible, also determine the last moves ...
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ECO A03 Bird's opening Dutch Variation for analysis

Here is fen diagram of end game, [fen "3Qk2r/B1p2pp1/p7/4P2p/P4P2/2P4q/2r4P/R2R2K1 w k - 0 1"] I tried few games with Bird's opening today. Chess.com says Bird's Opening Dutch Variation in fact ...
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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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About retrograde analysis

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.
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Creating the current position having the rest of the game

It's a question a friend of mine brought up and I found intriguing. Let's say you have the records of a game from a certain move to the end, using standard notation (i.e. Qf6). Either assuming random ...
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Is there fiction dealing with retrograde chess analysis?

I am interested in retrograde analysis problems, where the question usually is: 'What was the last move made?' or 'Where did the piece stand on the board before it fell from the table?' etc. ...