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Questions tagged [retrograde-analysis]

Retrograde analysis is a technique employed to determine which events occurred leading up to a given situation.

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An Atomic Proof Game

One day, I heard two of my friends were playing an online game of chess. I went to spectate, and this was the position: However, I looked at the move list, and realized White's sixth move had just ...
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Loser Chess : another proof game

After this puzzle has been solved, it is time to offer our clever solvers another Loser Chess game to reconstruct... Do you remember that I often pay a visit to my friends Fabi and Mag on evenings ? ...
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Paper, pencil and a bunch of bars

An entry for the Fortnightly Topic Challenge #40. Alice and Bob are two rational players who are playing a simple pencil-and-paper game. In the beginning, there are fifteen small vertical bars on ...
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Unfinished Snakes and Ladders

An entry for Fortnightly Topic Challenge #40, have fun with non-Chess puzzle! ;) Three young children: Red, Green, and Blue; were playing a classic game of Snakes and Ladders, when suddenly their mom ...
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A colorful glass circle

Entry into Fortnightly Topic Challenge #40 You've returned from your lunch break to a small package. Inside is a note that reads: Please come to my office at your earliest convenience. We have ...
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Reconstruct a game of Loser Chess

In loser chess, the rules are the same as in classical chess but for the following points: The king behaves just as any normal piece and can be captured. There is no check, no checkmate, and the king ...
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Reconstructing A Chess Game #4

My five years old pupil Magnus is really on fire ! After three wins in the first, second and third games, he is playing White today in round 4 against one of the tournament's favorites (a child who ...
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Three free moves, three more moves, mate

This morning, at the coffee corner in our office, I met a colleague who mentioned he'd be joining a chess club. So I asked him: "And, how was your first evening at the chess club?" "Well, it was a ...
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Megan mated by a king move

"Been playing some chess with my husband recently", my friend Megan began, as we sat with our drinks in Coffee Monarchy. "How'd you get on?" I asked. "Didn't get off to a good start, I'm afraid. In ...
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Mate in 0 moves

Not exactly a traditional chess puzzle, and I won't offer much of an explanation for fear of giving away the answer. White must mate in 0 moves, meaning he must deliver a check mate without touching ...
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Fabi and Mag played chess again

Fabi and Mag love chess, and I love to watch them playing together. I am not such a strong player myself, but I am an excellent spectator! The three of us were having a nice evening around a chess ...
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How did four chessmen disappear?

I was visiting two friends yesterday and found them sitting at a chess table. After a glance at the board, I thought I had interrupted them when they were installing the starting position and I said: ...
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Murder in the Royal Court

An entry in Fortnightly Topic Challenge #40: Retrograde Analysis! I can't believe it! Last night we heard a bit of fighting... but we had no idea that... our King was in check, and my fellow Rook and ...
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Retrograde Go Problem (Some Assembly Required)

An entry into the Fortnightly Topic Challenge #40. In case you aren't familiar with the rules of go, the information in the basic rules section of the Wikipedia page should be enough to solve this ...
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A poorly-designed chess problem

Entry into Fortnightly Topic Challenge #40 Out of character comment: For effect, don't open up the next spoiler until you've finished the statement before. If answering, please explain each remark. ...
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8-move checkmate with king

This is a pretty unusual chess game. Checkmate with the king on move 8. Based on the three moves provided, can you reconstruct the game? 5.Nd2 7... a6 8.Kd1#
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Reconstructing A Chess Game #3 (fanmade)

I'm a huge fan of the first 2 parts made by @Evargalo, so i'll try too My teacher once told me a strategy to defeat the enemy in the second turn. I was so excited (:P) I forgot it. Can you help me?
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Reconstructing A Chess Game #2

My 5yo pupil, Magnus, is playing his first chess tournament. Although I missed his first game, @Elder helped me reconstruct this important first win from the few clues I could collect. Alas, the ...
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Reconstructing A Chess Game #1

My young pupil, Magnus, just played his first chess tournament! I went for a coffee at the beginning of his first game ; he was White against a boy slightly older than him, maybe a 6yo, so he was a ...
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Copycat Chess, Again

Your task is to reconstruct a chess game, which was played according to standard chess rules, given the following information: the first 7 moves by white were exactly copied by black (i.e. if white ...
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Let's continue our Monopoly game

This is an entry into the 29th fortnightly topic challenge - Retrograde Analysis. Two friends and I were playing a game of Monopoly when we were forced to stop. It's been a long time since we ...
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Megan and the chess game

It was a bright sunny day of the sort that we occasionally get in this part of the world (it was the fifth Friday in March). In the park was a van advertising its wares under the banner "Hyper Ices", ...
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The master programmer and the mystical reversal

The master programmer sat at his desk, gazing into the distance, his eyes seeing, and yet unseeing. The lunch had been heavy. His reverie was interrupted by the appearance of his close colleague, ...
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A retroanalysis problem in bridge

This is an entry into the 29th fortnightly topic challenge - Retrograde Analysis. You're passing a bridge table when one of the players (South) is called away suddenly. He gives you his hand and says ...
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Introducing: Sudoku-Janpu

This is an entry into the 29th fortnightly topic challenge - Retrograde Analysis. Scenario: Alice and Bob were playing a game of Sudoku-Janpu. Alice: I win. Bob: (looking at the board) Oh man, not ...
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Smallest number of moves to get to a chess position

Inspired by a recent question posed by Roger Penrose, what is the smallest number of legal chess moves to get to this position?
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Analytical puzzle [duplicate]

You have twelve coins. You know that one is fake. The only thing that distinguishes the fake coin from the real coins is that its weight is imperceptibly different. You have a perfectly balanced scale....
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Which word wasn't with Wednesday's …crossword

An entry in the 19th fortnightly challenge... You sit down to breakfast this morning and open the paper. You had done the crossword from last Wednesday and the answers are supposed to be in here ...
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My colleague got mad!

This is an entry for the 16th Fortnightly Challenge. You won't believe what happened at work today! I was working on a new software when Robert, the colleague I work with on this, got mad in a second ...
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Musical message from a long-lost uncle

Can you help my friend figure out how the message below from her long-lost uncle indicates anything? (I should mention here: The actual message was lost, and the text below is the best that could be ...
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Is there a retrograde analysis puzzle like “Point on the incorrectly drawn chess piece”?

Does anybody know a nice chess puzzle, where the question states: Exactly one piece is drawn incorrectly on this diagram; another piece must be drawn on its position. Find the incorrectly drawn ...