# Questions tagged [chess]

A puzzle related to chess, a two-player board game with white and black pieces of varying ranks.

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### Swap the positions of the 4 chess knights

The puzzle seems simple enough. It is only a few squares and you only have four knights (the knights move in an “L” shape, like in regular chess). The goal is also straightforward: swap the positions ...
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1 vote
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### Can black and white cooperatively put a stalemate to black in 16 moves (under ser-h conditions)?

ser-h=n – serial helpstalemate in n moves. Black execute n moves in a row, after that White execute a stalemate for bK. Additional questions: a) how many stalemates are possible under the same ...
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### Can white checkmate in 1 move?

How can this position be reached (via a valid chess game) so that white can checkmate in 1 move? S.Nichto,2024 If desired, you can answer additional questions: a) the minimum number of moves in the ...
• 199
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### What were the last three single moves?

Puzzle by Niels Høeg: White just moved. What were the last three single moves? In other words, what was White’s last move and Black’s move before that and White’s move before that?
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### Fill the grid subject to product, sum and knight move constraints

Using the numbers 2, 3, 4, ... 19 each exactly once, fill some of the empty squares in the grid with a number so that the product of the numbers in each row is as shown, as is the sum of the numbers ...
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### Can you find the last 20 moves? #2

In this puzzle I finally managed to implement some themes that I really like, but so far was not able to get working properly in any of my own puzzles. Composing this was quite the challenge and in ...
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### Who are these rooks?

Here is my newest retrograde chess puzzle, perhaps a bit on the trickier side once again: Can you determine the origin of each of the four rooks in this position? Please provide your reasoning and a ...
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### Can White still castle? #2

For this puzzle I had another go at this theme, with a bit of a different take: Is it possible to reach this position in such a way that White can still castle? Please provide your reasoning in your ...
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### Playing with their food

Here is another retrograde chess puzzle! For once, this should be much more approachable than all my previous stuff (but hopefully still quite cute), so please feel free to have a go if you would like....
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### King and Pawn Endgame

Here comes another retrograde chess puzzle, this time focussing on just the history behind the pawn structure. Constructing this was a fun challenge and I think the result is pretty cute. :) Can you ...
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### Can you find the last 20 Moves?

For this puzzle, I tried my hand at a type of structure similar to those appearing in a few of Dmitri Baibikov's (brilliant!) puzzles. It took a lot of fiddling to finally get this working, but I'm ...
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### The last five Moves #2

Once again, here is another retrograde analysis puzzle! The task is simple: Can you determine the last five (half-)moves that led to the position below? Please provide your reasoning and a (sketch of ...
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### What were the last five moves?

Here is yet another retrograde chess puzzle - this time a bit more on the trickier side, I believe. I'm quite happy with how this one turned out, so please have a try if you like :) What were the last ...
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### Which of these chess positions is legal?

This little quiz should be a bit easier than my previous puzzles so feel free to join in! Simply put: Which of these chess positions is legal? To be clear, I consider a position to be legal, if it ...
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### Can you solve the fates of the missing chess pieces?

Here is another retrograde puzzle from me - this time getting by without any underpromoted pawns if you can believe it! :) In the game leading to the position below, both players have lost three of ...
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### Can White still castle?

Here is my third retrograde puzzle—I hope you will enjoy it :) For this construction, I took some inspiration from shoopi's excellent puzzle series from a while back. It should also be a bit more ...
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### What was White's last move?

Another retrograde chess puzzle! Unless I overlooked some shortcut, this should be a bit more tricky than my last one: In the position below, what was White's final move? In your answer, please ...
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### How did White lose all their pieces?

Recently, I have been dabbling in composing a few retrograde chess puzzles. This one, I feel, turned out quite nice: In the game leading to the position below, White somehow lost both their rooks and ...
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### The Last Chess Game

Mr. Squares left you his property. You discover a mysterious chest locked with a seven-letter combination lock. On the chest, an engraved checkerboard with a game's worth of chess moves: Game ...
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### General attacking chessboard squares

This is a general version of this beautiful puzzle. Place any number of standard chess pieces on a 8x8 chessboard, such that there is at least 1 empty square attacked by exactly 1 piece, at least 1 ...
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### Attacking chessboard squares with 6 pieces

Place 6 white pieces (a king, a queen, a rook, a bishop, a knight and a pawn) on 6 different squares of a regular 8x8 chessboard so that there is at least one empty square attacked by exactly one ...
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### Find a chess position that can occur twice but not thrice in a single game

For purposes of this puzzle, a chess position consists of an arrangement of pieces on the board, as well as the side to move. No other information about the game state is included. The objective of ...
265 views

### Mate-in-25 tsumeshogi

This is apparently the first shogi-related question on this site! Yay! Anyway, this is a mate-in-25 tsumeshogi. Sente (the player with the pieces pointing up) is to move and by an uninterrupted series ...
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### Rooks covering Dark Squares on a Chessboard

How many rooks are required such that all dark squares on the chessboard are covered by at least one rook.
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### How to beat level 24 in Chessformer?

This is Level 24 in Chessformer: This is pretty easy to do at first, as long as you don't click the restart button (which I did by complete accident when I had some good progress on this level): ...
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### Decent Knights - Chess

In Naughty knights it’s asked to prove that it’s impossible to fit more than 32 knights such that no knight attacking other. Can you find the minimum number of knights, filling the table in a way that ...
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### What is the longest single-branch chess sequence?

A chess position's n-score is defined as: NaN if it's impossible for the position to be played for another n half-moves (assume that the game ends in a draw as soon as the same position is repeated 3 ...
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### Chess with gravity #2: Keys, Locks, and Lava

Previous Puzzle If you're having trouble understanding the key/lock thing, watch this until 9:30 which might be a better explanation of what I'm trying to say General Rules: In this puzzle, you ...
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1 vote
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### Chess, but with gravity? #1

Based off of this puzzle and this Youtube video Rules: You control the pieces labeled kn (knight), b (bishop), and ...
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### A check is a win

Consider a normal game of chess with one change. As soon as you put the opposing king in check you have won. If both players play optimally, how long is the game?
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### Two-Move Chess Game

Consider a standard game of chess. We make the following modification: on a turn, if a player makes a move which neither captures a piece nor puts their opponent’s king in check, then they may make a ...
1k views

### 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. ...
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### Chess with jumping

Puzzle Statement: Consider the game of chess, but with a slight modification of the rules as follows: all heavy pieces (i.e., the queens and rooks) are allowed to jump as far across the board as they ...
1 vote
1k views

### 16 queens puzzle

Can you place 8 white queens and 8 black queens on an 8x8 grid, such that no two queens of the same colour occupy the same row, column or diagonal?
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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 ...
123 views

### Chess 960 and Castling #1

You are given a Chess960 starting position, but you don't know it is actually the starting position (the knights and maybe other pieces moved around). For which of the Chess960 starting positions you ...
2k views

### Poison ivy chess: Can the king get to safety?

The king is on a chessboard filled with poison ivy bushes. Can the king get to safety? Details: The king is initially located at the top left-hand corner square of the chessboard. The finite ...
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### Permuting officers during a Chess960 game

There are... let me see... ah yes 960 different possible starting positions in Chess960. Suppose the players never move a pawn, or make a capture, but simply move their officers so that eventually ...
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### Moving a knight to a new square each turn: who wins?

Alice and Bob are playing a game. Alice starts by placing a knight on the chessboard. Then they take turns moving the knight to a new square (standard chess rules apply: the knight moves in an "L&...
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### Gravity Chess - Slipping Through the Cracks

Chess Mate Attack is a mobile puzzle game released earlier this year. Each of its 90 (at time of writing) levels follows the same basic principles: Play takes place on an $m×n$ chessboard, whose ...
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### 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 ...
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### 5 chess pieces dominating a 5x5 grid

This is a puzzle based on work by Rodolfo Kurchan. Can you place a pawn, a knight, a bishop, a rook and a king on a 5x5 chess grid, such that every empty cell is attacked by at least one piece? Note ...
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323 views

### 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, ...
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### How many moves to reach this position?

I was recently introduced to this lovely mate in 1 puzzle. It’s best when shown on a physical chess board. But what is the smallest number of moves it would take to reach this position?
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### What did I do wrong?

My friend and I were bored so we decided to play a game of chess. I lost, for I have done something bad. I was a beginner, so I could not find where I went wrong. I wanted to know what was wrong, so I ...
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### 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 ...
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1 vote
176 views

### Ma Drasi and her kitchen in need of paralyzation

I visited Ma Drasi's kitchen today, and it was a hot mess, both temperamental and situation-wise. The rooks were rattling, cooks were crying, snooks were shattering, and crooks were flying and defying!...
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### A balanced banquet

As your king's fitness adviser you have been tasked with optimising His Majesty's diet. This entails making sure that the king eats equal amounts of carbs (rooks), fat (bishops) and protein (knights). ...
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