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
187 views

An Enigmatic Game

I have a fun-ky puzzle for everyone today. Here is the position. FEN-rnbq1rkb/ppp1pp2/5p2/8/8/4K3/PPPPNP1P/RNBQ1R2 It can be reached in one way in exactly 9.5 moves, or 10 White and 9 Black moves. ...
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Homeworlds: Mercury in Retrograde

Consider the following position in a game of Binary Homeworlds. ...
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Who shall be the winner?

There are two questions to answer here: Who will win this game of chess? What were the last 96 individual moves (ply) by both sides? The solution is unique. Gyula Breyer The Chess Amateur 1922, ...
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4answers
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What was the last move made in this game?

What was white's last move in the game shown below? Note: This is a screenshot taken from an actual game and all moves made were legal. ETA: The last move played by white was the last move of the ...
9
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3answers
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Where art thou, oh native rooks?

Here’s a tough puzzle for you all today! Given that both White and Black conspired to reach this position as briskly as possible, where standth White’s native rooks (the one from the starting ...
7
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2answers
372 views

A Simple Question

May White mate in two? Good luck! Thomas Rayner Dawson, Tidskrift för Schack, 1923
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3answers
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Only one square for the white king

Consider this position. It is white's turn to move. Your job is to place the white king so that white have an overwhelming (winning) advantage. Where is it? Please note that: While Queen usually ...
3
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2answers
271 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 ...
9
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3answers
457 views

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 ...
10
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1answer
324 views

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?
91
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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
611 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 ...
0
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1answer
185 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
244 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 ...
2
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1answer
120 views

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# ...
6
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1answer
343 views

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 ...
3
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1answer
224 views

That Ain’t Right… #3

Here’s a simple challenge. With 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....
4
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1answer
162 views

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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4answers
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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 ...
4
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1answer
227 views

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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2answers
122 views

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 ...
3
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1answer
109 views

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
161 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
149 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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2answers
371 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
100 views

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 ...
7
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1answer
203 views

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 ...
7
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1answer
243 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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1answer
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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
270 views

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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3answers
866 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 ...
8
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1answer
216 views

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
186 views

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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1answer
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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
402 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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3answers
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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
770 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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2answers
224 views

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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4answers
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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
322 views

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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1answer
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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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787 views

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 ...