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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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115 votes
5 answers
16k views

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 ...
JGibbers's user avatar
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106 votes
4 answers
8k views

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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89 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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55 votes
4 answers
9k views

An Easy Mate In 1

As stated in the title, white must mate black in 1 move. But first you must solve the mystery behind this puzzle. This puzzle was created by Hieronymus Fischer (1843-1927).
Sleafar's user avatar
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54 votes
3 answers
3k views

A 16 Clue Sudoku Puzzle (but the kings can't be in check)

An entry in the 19th fortnightly challenge... Above is a 9x9 "chess" board with some pieces already laid out, your goal is to fill the board completely, following standard Sudoku rules (i.e. every ...
Alconja's user avatar
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52 votes
3 answers
6k views

A very unique chess puzzle

Find a legal move for white that does NOT mate in one. Source: by Karl Fabel & was reprinted in Martin Gardner's New Mathematical Diversions from Scientific American (pub. Simon & Schuster), ...
Quintec's user avatar
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51 votes
4 answers
5k views

What was I supposed to do?

An entry in Fortnightly Topic Challenge #49: Pub Quiz Camouflage I've had the strangest day. Today I was invited to play in a chess tournament (or so I thought). As a keen (and pretty good) chess ...
Stiv's user avatar
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49 votes
4 answers
6k views

Chess : The Lone King

An arbiter is trying to figure out what happened on the above adjorned game. He only knew that black made 15 moves and there can be more than one line of moves for this. Can you replay at least one ...
TSLF's user avatar
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49 votes
2 answers
4k views

Can you stop the rambling rook?

This is a chess puzzle someone showed me a long time ago. If you already know this puzzle please give the others a chance to solve it first. This puzzle was originally created by Otto Gallischek and ...
Sleafar's user avatar
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48 votes
4 answers
3k views

Pythagorean Chess: Knishops

In chess, Knights moves to squares a distance $\sqrt5$ away. Bishops move distances $\sqrt2$, $\sqrt8$, $\sqrt{18}$, etc. Both pieces are restricted to non-integer distance moves. Enter the Knishop, ...
Johannes's user avatar
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46 votes
2 answers
2k views

lolcatz can haz ur infinit cheeseboard

This is a problem on an infinite chessboard with pieces called lolcatz. They can move like queens or knightriders, but have a strange disadvantage... ... you've never heard of knightriders? Well, ...
deep thought's user avatar
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44 votes
8 answers
7k views

How many Chess Pieces are needed to control every square on the board? No Piece Restriction

You may use as many pieces as you like. Pieces do not control the square they occupy. Accepted Answer goes to the person that has the least score. Piece cost: Pawn - 1 Knight - 3 Bishop - 3 Rook - ...
warspyking's user avatar
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42 votes
1 answer
3k views

Crippled King Crossing a Canyon

A chess king has been injured in battle against an evil wizard, and can no longer move northeast or southwest. This king is on the North rim of a canyon, and must flee to safety on the South rim. ...
Mike Earnest's user avatar
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39 votes
6 answers
3k views

Chess Fortnight is finally over!

(Note: the backstory here may or may not be entirely fictitious.) The fortnightly chess theme is finally over! I couldn't stand it. It was chaos! Pieces moving around in all the wrong ways... I was ...
Deusovi's user avatar
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38 votes
11 answers
8k views

A Very Illegal Position

It's been a while since I've done a chess puzzle, so here's one! This position is illegal in quite a lot of ways: It's illegal in at least 10 ways. The first one to find all of the ways this ...
Excited Raichu's user avatar
37 votes
4 answers
18k views

How many chess pieces does it take to "cover" all spaces on a chessboard?

Given an 8x8 chessboard, your goal is to "cover" each space on the board with the fewest possible number of pieces. A space is "covered" if there is a piece on it, or if a piece on the board can be ...
Xynariz's user avatar
  • 3,622
36 votes
6 answers
4k views

White is winning here. But how?

White to move. This puzzle is composed by myself!
Hobacle's user avatar
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35 votes
5 answers
3k views

A Queen and her Pawns

Place a queen and as many pawns as possible on a chessboard so that the queen has just one way of capturing all the pawns in precisely as many moves as there are pawns. Pawns do not move and do not ...
Bernardo Recamán Santos's user avatar
34 votes
5 answers
3k views

"Murder!", said the knight

It is the middle of a moonless night when the people of Birmingham are awakened by a scream coming from the streets. Someone has been murdered, they soon hear, but no body was found. Everyone gathers ...
Arnaud Mortier's user avatar
34 votes
3 answers
6k views

Mate in one with NO PIECES?

The following pictures depict chess positions one move before white checkmated black: The problem is, I seemed to have completely lost which pieces each letter/number represents. All I know is that ...
awesomepi's user avatar
  • 2,969
33 votes
6 answers
3k views

Swapping rooks in a 4x4 board

You have a 4x4 chessboard with four black rooks on the top and four white rooks in the bottom. Your goal is to swap these rooks using the minimum number of steps. It does not matter which rook is ...
Chaotic's user avatar
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33 votes
5 answers
3k views

Biggest army on a chessboard

Reminder: Everybody knows that we can place 8 queens in a chessboard without threatening each other (see here). Same reasoning can be applied for knights, bishops, rooks and kings. Giving ...
Untitpoi's user avatar
  • 2,700
33 votes
1 answer
9k views

Can a chess player promote all pawns to queens?

In standard chess rules, a pawn is promoted if it reaches the far side of the board. Usually, the pawn's owner chooses to promote it to a queen. Is it possible for one player to eventually promote ...
TenMinJoe's user avatar
  • 542
32 votes
5 answers
5k views

How can 3 queens control the white squares?

It is well known that there is no way of arranging 4 queens on a checker board in such a way that every square is occupied or threatened. Now consider a slight variation where we only need to cover ...
Paul Panzer's user avatar
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32 votes
3 answers
5k views

How many squares can 4 queens control?

Though there is no strict mathematical proof, it has been shown via brute-force that no arrangement of 4 or fewer queens can control every square on a standard 8x8 chessboard. So, out of the 64 ...
Unsigned's user avatar
  • 471
32 votes
2 answers
3k views

There is only s̶i̶x̶t̶y one place he can be

This puzzle is not mine, although I don't have any reference as to where it originated from. I discovered it when I was a student, some fifteen years ago. It has been among my favourite chess puzzles ...
Arnaud Mortier's user avatar
31 votes
5 answers
8k views

Switch The Knights

On a small $ 4 \times 3$ chessboard, the top row is filled with black knights and the bottom row with white knights. On each move, you may move one knight (as it moves in chess) to an unoccupied ...
Mike Earnest's user avatar
  • 32.4k
31 votes
3 answers
1k views

Rook River (Chess Sliding Puzzle)

The absent-minded king has gotten himself lost. Help him return to his palace on h8 using as few moves as possible. Only legal chess moves are allowed. Pawns are not promoted on the final rank. You ...
DyingIsFun's user avatar
  • 9,186
31 votes
4 answers
3k views

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: ...
Evargalo's user avatar
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31 votes
3 answers
2k views

Knights on a Torus

An 8×8 chessboard is in the shape of a torus. (This means that the board "wraps around" - you can go left from a2 and come out on h2, for instance. It also works vertically - you can go up from f8 and ...
geeky me's user avatar
  • 413
31 votes
1 answer
2k views

Conway's Game of Knights

You have 1 chess piece: The Knight The board: Conway's Game of Life Your goal: Survive Basically, you control a standard chess Knight. You are only allowed to move to cells considered "live" (...
David Starkey's user avatar
31 votes
2 answers
2k views

Rubik's Chess Puzzle

This puzzle is part of the Fortnightly Topic Challenge - "Unconventional Tag Fusion". Last week I found out that Puzzle Prime Co. have invented new type of puzzle - Rubik's Chess. The goal is simple -...
Puzzle Prime's user avatar
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30 votes
7 answers
6k views

Another Easy Mate in 1

Standard chess rules apply, the board is not rotated (i.e. white pawns move upwards), no lateral thinking is needed. Simply find the one move for white which mates the black king. This puzzle was ...
Sleafar's user avatar
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30 votes
1 answer
2k views

Trapping The Knight

A knight is placed on an infinitely large chess board with no edges. It can only visit each square once. What is the smallest number of moves it can make that would cause it to become trapped?
Oray's user avatar
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29 votes
2 answers
5k views

How many queens can be on a chessboard without attacking each other?

What is the maximum number of queens that can be placed on a standard 8x8 chessboard such that no one of them is capable of attacking any of the others in a single move?
Xynariz's user avatar
  • 3,622
29 votes
4 answers
3k views

Rolling cube on an infinite chessboard

Imagine a six-sided die, D6, the right size to exactly occupy a square on a chessboard. The die can move to any adjacent square, but does so by rolling rather than sliding, so the topmost side of the ...
Laska's user avatar
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28 votes
7 answers
8k views

Two Knights, two Bishops, two Rooks and two Kings on a 4x4 chessboard

Place two Knights, two Rooks, two Bishops and two Kings on a 4x4 chessboard, so that: 1) The Kings are not attacked at all. 2) All other pieces are attacked exactly once. Ignore color, so every ...
Tweakimp's user avatar
  • 1,820
28 votes
2 answers
1k views

The Swedish king and the chessboard

The following puzzle is an old classic, due originally to the great puzzler Sam Loyd, who published the first three parts in 1859; the fourth and fifth parts are variations due to Brian Stewart and ...
Rand al'Thor's user avatar
27 votes
6 answers
5k views

Checkmate 30 kings with rooks

Using only kings, and as few rooks as possible, set up a position where 30 of black's kings are checkmated. Checkmate: The king is in check The king has no moves out of check Black only has kings, ...
SE - stop firing the good guys's user avatar
27 votes
4 answers
3k views

Black wants to go first!

Billy and Matthew decide to play a game of Chess. They live far away, so they decide to do it online. Matthew wants to play first, but the game randomly gave him the color black (who goes second.) ...
warspyking's user avatar
  • 14.5k
27 votes
2 answers
3k views

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 ...
Tim Seifert's user avatar
27 votes
2 answers
6k views

Can you solve my Chess Sudoku puzzles?

Rules Normal Sudoku rules apply except that instead of 9s you must place chess pieces. A puzzle can mix chess pieces, and in principle any piece may be used - although the rest of the constraints ...
Peter Taylor's user avatar
  • 4,541
27 votes
4 answers
2k views

Introducing: FootChess!

Imagine if your chess pieces got bored of their little war games, and decided to play something a bit different. The rules are like Chess except as follows: There is a Ball piece that starts in ...
Sconibulus's user avatar
  • 19.7k
26 votes
6 answers
4k views

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 ...
Elliot Glazer's user avatar
26 votes
2 answers
1k views

The Knight's Romp

Recently I was messing around with a singular knight on a chess board, and I came up with an interesting dilemma. Can you move a knight, from starting on any square, such that its path covers every ...
TakingNotes's user avatar
  • 3,449
26 votes
2 answers
2k views

A Puzzle That Marches Swiftly To The Median

James Bond enters M's office. ...
Hugh Meyers's user avatar
  • 23.7k
25 votes
5 answers
5k views

Why isn't this chess puzzle trivial?

This chess puzzle has become popular in the last few days: But doesn't the white king just need to wander to where the cross is, then move the white pawn forward, then the black bishop takes it and ...
Simd's user avatar
  • 7,845
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
  • 9,327
25 votes
2 answers
2k views

Rooks on a 15x15 chessboard

On a 15x15 chessboard there are 15 rooks that do not attack each other (via ordinary rook moves). Then each of the rooks makes one move like that of a knight. Is it possible that after all this is ...
D.A.G.'s user avatar
  • 2,366
25 votes
3 answers
3k views

Interchanging Knights and Rooks

Interchange, in the least posible number of moves, the positions of the the two black knights and black rook with those of the two white knights and white rook. Movements allowed are those of the ...
Bernardo Recamán Santos's user avatar

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