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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1answer
158 views

Judge this position

An odd chess crime has occurred. The below position, a criminal one, was on the board when it was intercepted. Is it a legal or illegal chess position? Give reasonable proof as to why. You are to ...
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So, what's to do?

It's White to move and draw the game. What must White do? You must provide proof for your claim of what's to be done by any reasonable means. No looking up the solution please! Nikita M. Plaksinm ...
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A Checkmate of Dubious Legality

Full-size image Black has just delivered checkmate in the above position - but is the position legal? If no, explain why. If yes, give Black's mating move. FEN: 3r4/2r4b/8/8/8/3Kp3/5k2/8 w - - 0 1 ...
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1answer
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Reverse dots and boxes – Guess the last move

Alice and Bob are playing a game of reverse dots and boxes. The players take turns adding one horizontal or vertical line of size 1 in one free spot on the grid (marked with light gray lines ...
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4answers
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Find Those Chess Notations! #7

It's been awhile, so welcome to my series if you haven't seen it before! Number Of Moves: 15 Checkmater: Black Given Game: ? ? ? ? ? ? ? ? ? fxe3 ? ? ? ? ? ? ? dxe4 ? dxe6 ? ? ? ? ? fxe5 ? ? ? ...
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4answers
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White's last move?

You guys have proven to be quite capable chess detectives. So here is one more mystery for you to solve: What was White's last move?
89
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4answers
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Checkmate in 1 on a Tangled Board

Lots of pieces are tangled here. Can you find mate in one? Small hint to guide you in the right way:
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Can White Castle? #3

Since it seems at least some people are enjoying these I'm continuing the series. This one is not quite as elegant, but still interesting. Can White Castle?
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1answer
587 views

Can White Castle? #2

Following on my previous puzzle that was well received (here).Note that this one is a lot shorter / easier, so feel free to participate! Can White Castle?
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Can White Castle?

This is the first chess puzzle I composed in the retrograde genre. I originally posted this in a chess dedicated forum. Hope you like it! In the following position, is it possible that White could ...
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1answer
151 views

Where is the White King? [duplicate]

I recently stumbled upon this puzzle on a known video platform. Apparently it's from the cover of an old book named "The Chess Mysteries of the Arabian Knights". The white king made himself ...
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2answers
230 views

Place The Black King Legally-Two Solutions

Warning: If the wording seems cryptic to you, that’s because it is meant to be. Here’s a puzzle for you: legally place the black king in the following diagram. Additionally, assuming that all white ...
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1answer
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Find Those Chews Notations! #6

Here be a hearty return to the original point of this series: retrograde analysis! Number Of Moves: 12 Checkmater: White Given Game: ? ? ? ? ? ? ? 0-0 ? ? ? ? ? ? Nf6+ Kh8 ? ? ? ? Nxf5 ? Ng6# ...
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The Not So Knights Challenge

You have been imprisoned by your super duper cliché evil king named Tim Goldsteen for sneezing during his birthday party. Apparently he’s that evil. Anyhow, you found out Tim’s secret that he enjoys ...
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1answer
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That Ain’t Right… #3

Here’s a simple challenge. Wtih black to cooperate and move first, and white to checkmate, checkmate black in 6 plies (half-moves.) Only one illegal move may be made, and white makes only legal moves....
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1answer
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The Fastest Way-A Special Positional Challenge

This is my first “find the fastest way to this position” chess puzzle” here on PSE. However, this is not for just some random position. Let me explain. Tim Krabbe has said on his site (Journal Entry ...
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Tht Aain’t Right… #2

I already have another, probably very easy, for you all again! Task: State the rule/s that you believe are being broken based on the position and/or what clues I have/you think are being given. You ...
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1answer
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That Ain’t Rght… 1# (Definitely!)

Many chess problems are dedicated to legal games, and very few to illegal ones. So I’ve decided to start another series of the latter! Every problem I make will have some offbeat thing about it that ...
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Find Those Chess Notations! #4

Yes, it’s back again! This one is going to be a little different however. Number Of Moves: 11 Checkmater: White Final Position: Cryptic Clue #1: Not all is as it seems! Cryptic Clue #2: Are ...
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1answer
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Find Those Chess Notations! #3

I’ve decided to do something a little different this time. I’m going to give you nearly all of the moves of one side, and must figure out the rest of the moves of the other side. Variations are ...
6
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1answer
154 views

Find Those Chess Notations! #2.5

Yet again, just another small one that I created before the next big one sometime tomorrow! Number Of Moves: 7 Checkmater: White Given Game (Regular Chess Notation): 1. ? ? ? ? ? ? ? O-O ? g5 ?+ ? ...
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1answer
146 views

Find Those Chess Notations! #2

Alrighty, it’s time for round two, as I promised! It’s a challenging one alright, I believe! Number Of Moves: 17 Checkmater: Black Given Game (Regular Chess Notation): ...
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354 views

Fantastic Foxhole Failures

I have decided to make a little bit of theme for this next chess question. And that theme is foxholes in war. Makes sense to me since chess is a technically a war-themed game. I have two puzzles for ...
6
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1answer
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Find Those Chess Notations! #1.5

This is this a small puzzle for you all until I come out with a big one for #2. Number Of Moves: 6 Checkmater: White Given Game (Regular Chess Notation): ? ? ? ? bxa3 g6 ? Ne7 ? ? Nh6# Cryptic ...
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1answer
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Find Those Chess Notations! #1 (Probably)

I’m hoping to begin a mini-series where you will have to figure it’s the entire notation list of a game being given a few moves, a few cryptic hints, and the number if if moves, and which side gets ...
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1answer
223 views

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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2answers
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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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830 views

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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1answer
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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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3answers
367 views

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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1answer
728 views

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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1answer
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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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4answers
478 views

Reconstructing A Chess Game #1

My (very) young pupil, Magnus, is playing 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 ...
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342 views

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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1answer
676 views

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 ...