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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Retrograde Analysis Problem Inspired by Various Chess Memes

Standard Retrograde Analysis conventions are used. In addition, the following rules also apply: White must begin the game with 1. d4 and 2. Bf4 If capturing en passant is legal then it is mandatory. ...
happystar's user avatar
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2 votes
2 answers
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Chess 960 and Castling #2

For how many Chess 960 starting position you can play into a position such that the game requires castling? Again for "standard" chess, this is impossible(§): You must let a bishop out, but ...
Hauke Reddmann's user avatar
16 votes
2 answers
1k views

Scholar's mate with queen excluder

The queen excluder is a type of barrier used in beehives which lets through small worker bees but not the larger queen bee. Extending this simple but powerful concept into the chess world, let's ...
Jafe's user avatar
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11 votes
1 answer
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A look at the rooks

Let's book a look and figure out the rooks from the mooks. Which ones are the original kings' rooks? This was composed by Boris M. Klementjew and published in Shakhmatnaya Kompozitsiya 15, page 60, ...
Rewan Demontay's user avatar
6 votes
2 answers
276 views

Kingly Laziness

What is the minimum effort the White king must put into arriving at this destination? His Majesty is not feeling productive today. This position was composed by Gianni Donati and published in Phénix ...
Rewan Demontay's user avatar
7 votes
2 answers
4k views

Find this Mate in 1

This position was from one of my online games on Chess.com. I had the white pieces and was very close to victory. However, I couldn't find the mate in 1 as stockfish did. Where on earth was the mate ...
user avatar
6 votes
2 answers
336 views

Pawn Or Bust, Save The Game

Catastrophe! During a last-minute mad scramble, a White pawn was struck off the board into oblivion. Neither player can remember where to place it. The piece count is looking bad for Black. ...
Rewan Demontay's user avatar
7 votes
2 answers
269 views

The Rook's Hassle

Long ago, the Black rook was trapped, stuck on c4, sapped and sacked. Let us unwind its snarly woes, and stop the clock. Turn back the flow, find out how long ago, to the original dock. How many moves ...
Rewan Demontay's user avatar
5 votes
2 answers
631 views

A Complicated Exercise In Addition

Another day, another walk down to the cafe. I was waiting in line for my coffee, wondering what the barista could do this time to make my name look whack. But as I waddled in line, a curious site ...
Rewan Demontay's user avatar
5 votes
1 answer
716 views

Guess the algorithm

Here you are seeing part of a pattern I created with my computer. Can you either reproduce it or describe the algorithm I used?
loopy walt's user avatar
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2 votes
3 answers
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How old is Grandfather?

This position has been used in hundreds of chess problems for various reasons by a plethora of problemists over many, many decades. It is known as "Vielväterstellung" in German, or "The ...
Rewan Demontay's user avatar
3 votes
3 answers
364 views

Chess Construction Challenge #9: Two Eggs & A Flood

I have an odd idea for this challenge. It involves a very specific proof game construction. So pay attention! Given that: White and Black cannot move more than one pawn each throughout the entire ...
Rewan Demontay's user avatar
3 votes
1 answer
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Chess Construction Challenge #8: Three Times The Charm

On a chessboard, a piece has a set number of legal moves. It can range from 0 to 27. However, this amount can also restricted. My previous questions have covered n=1 and n=2, it is time for n=3! Given ...
Rewan Demontay's user avatar
7 votes
3 answers
548 views

Chess Construction Challenge #7: Double The Fun

Many thanks goes to @Retudin in a comment on my last question for this idea. In a chess position, pieces can be restricted as to how many moves they can legally make in theory. Since my previous ...
Rewan Demontay's user avatar
9 votes
5 answers
1k views

Chess Construction Challenge #6: The One Move Royale

In chess, it is possible for a piece to have only one legal move. For example, in this position, the Black king can move only to h2. Given that: All 32 pieces are available for use. Construct: A ...
Rewan Demontay's user avatar
11 votes
2 answers
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Never kill your king ... without first seeking proper legal advice!

This is a follow-up to (Almost) all hands on check by @loopy walt. The task (mate in one with as many essential pieces as possible) stays the same, but you are to go about it more cunningly. Recap of ...
Albert.Lang's user avatar
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6 votes
2 answers
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May White Castle?

Quite simply, may White castle in the below position? There is much more than what meets the eye! For the record, White pawns move up and Black pawns move down. Nikita M. Plaksin & Michel Caillaud,...
Rewan Demontay's user avatar
0 votes
1 answer
168 views

Mirror Mirror On The Board

Mirror mirror in the board Decipher the riddle of this horde How many moves to it, please? To put my brain at ease! Both sides help, follow their paths The solution you must craft Oh, and there is but ...
Rewan Demontay's user avatar
6 votes
1 answer
338 views

An intriguing game construction

I found that the book "Amusements In Chess," by Henry Ernest Dudney, has been morphed into a website. In the section "Various Chess Puzzles, I came across this particular puzzle that ...
Rewan Demontay's user avatar
2 votes
1 answer
222 views

Going back the the dance floor

Johnny, the White monarch, is homesick, and his friend Carla, the h1 rook, is away, using her time to help the lower citizens of the Black kingdom. They use to do such wonderful fun, but their ...
Rewan Demontay's user avatar
7 votes
2 answers
672 views

1x1x1 Rubiks Cube Puzzle

The solved position of 1x1x1 Rubiks cubes as shown was shuffle rolled without moving outside the 4x4 puzzle grid. All cubes are similar with face opposite colors: red to magenta,green to yellow and ...
TSLF's user avatar
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8 votes
2 answers
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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. ...
Rewan Demontay's user avatar
4 votes
1 answer
163 views

Homeworlds: Mercury in Retrograde

Consider the following position in a game of Binary Homeworlds. ...
Quuxplusone's user avatar
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5 votes
2 answers
203 views

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, ...
Rewan Demontay's user avatar
7 votes
4 answers
1k views

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 ...
DenverCoder1's user avatar
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9 votes
3 answers
370 views

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 ...
Rewan Demontay's user avatar
7 votes
2 answers
466 views

A Simple Question

May White mate in two? Good luck! Thomas Rayner Dawson, Tidskrift för Schack, 1923 Major Hint:
Rewan Demontay's user avatar
15 votes
3 answers
2k views

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 ...
Chess960's user avatar
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4 votes
3 answers
353 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 ...
Rewan Demontay's user avatar
9 votes
3 answers
501 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 ...
Rewan Demontay's user avatar
25 votes
3 answers
5k views

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 ...
Brandon_J's user avatar
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11 votes
1 answer
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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 ...
Jafe's user avatar
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2 votes
4 answers
241 views

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 ? ? ? ...
Rewan Demontay's user avatar
18 votes
4 answers
2k views

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?
shoopi's user avatar
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105 votes
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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:
shoopi's user avatar
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16 votes
3 answers
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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?
shoopi's user avatar
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17 votes
1 answer
713 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?
shoopi's user avatar
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86 votes
3 answers
9k views

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 ...
shoopi's user avatar
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0 votes
1 answer
540 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 ...
Sleafar's user avatar
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1 vote
2 answers
295 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 ...
Rewan Demontay's user avatar
2 votes
1 answer
150 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# ...
Rewan Demontay's user avatar
7 votes
2 answers
461 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 ...
Rewan Demontay's user avatar
3 votes
1 answer
346 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. ...
Rewan Demontay's user avatar
6 votes
2 answers
289 views

The Fastest Way-A 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 ...
Rewan Demontay's user avatar
15 votes
4 answers
2k views

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 ...
Rewan Demontay's user avatar
4 votes
1 answer
272 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 ...
Rewan Demontay's user avatar
6 votes
2 answers
162 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 ...
Rewan Demontay's user avatar
3 votes
1 answer
122 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 ...
Rewan Demontay's user avatar
6 votes
1 answer
185 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 ?+ ? ...
Rewan Demontay's user avatar
8 votes
1 answer
180 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): ...
Rewan Demontay's user avatar