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Questions tagged [chess]

A puzzle related to the game of chess. Questions about chess which aren't puzzles are off-topic but can be asked on Chess Stack Exchange.

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21
votes
1answer
1k views

Monte Carlo Chess

This is an entry to the 17th fortnightly topic challenge. Chess is an interesting game, but is so unrealistic. In real life, you couldn't tell order your knight to attack an enemy bishop and expect ...
2
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1answer
673 views

Closed knight tour on 7x7 board

This is an entry for the 17th Fortnightly Challenge. A knight's tour is a sequence of moves of a knight on a chessboard such that the knight visits every square only once. If the knight ends on a ...
7
votes
1answer
919 views

On 8x8 board, a knight is on the second square of the last row. Only moving upwards, how many routes to the top?

In chess, a knight moves in L-shaped jumps consisting of two square along a row or column plus one square at a right angle. It can only move upwards. How many routes can it take to any square on the ...
8
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3answers
432 views

Uncle Jimothy and the Kriegspiel match

Timothy and Kimothy were playing a rather intense game of Kriegspiel the other day. For those of you who don't know... Kriegspiel is a version of chess in which the players are not allowed to see ...
9
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4answers
655 views

The Toroidal Chessboard!

Inspired by this awesome question, and this old-but-gold question: What is the minimum number of Chess pieces to dominate(attack all squares) a 8x8 chessboard in shape of a toroid. image courtesy: ...
29
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1answer
1k 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" (...
21
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4answers
3k views

The Knight and the Maze

Shown below is a grid of blue and yellow squares with a knight in the upper left hand corner and green square in the lower right hand corner. Your task is to guide the knight from its starting ...
27
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2answers
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 ...
10
votes
2answers
942 views

Queen & “paralyzed” King vs King

In this puzzle the standard chess rules apply on standard 8x8 board, white has King & Queen and black has his King, the only exception to normal rules is that white is not allowed to move his king....
16
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2answers
979 views

Can white's rook and knight without moving white king force stalemate?

This is a recreational chess puzzle question. I'm interested in knowing if white's rook and a knight, can force black lone king to stalemate, without ever using in any way the white king. For simplify ...
4
votes
1answer
280 views

The kids moved when we were gone! What is the likelihood that white is winning?

Two friends were playing a friendly game of chess. The both have young children who they recently taught the rules and they agreed both children could help if they wished. In the position below (...
16
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3answers
729 views

Kill That Irritating Fly!

There is a long-lived fly fluttering somewhere out there. Some say this fly is able to perform additions and substractions. Quite an amazing diptera, right? Well, there are 7 friends who would ...
21
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5answers
1k views

Detectives vs Nelson: The Chessboard Serial Killer

This is about Nelson, a serial killer who, after each murder, leaves a chess diagram in the scene of the crime. These chessboards give the detectives the opportunity to decipher where, how and when ...
17
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2answers
1k views

Who stole the sorcerer's stone?

In a world of magicians, the sorcerer's stone was stolen. The investigating team conducted some searches, but couldn't find it. They came to the conclusion that one of the teachers of the "Magic Chess ...
38
votes
6answers
2k 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 ...
25
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2answers
1k views

A Puzzle That Marches Swiftly To The Median

James Bond enters M's office. ...
8
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2answers
479 views

Chess with bouncing and explosion

Consider chess with the following additional rules: The edges of the board consist of ranks 1 and 8 and columns a and h. Bouncing: When a piece goes from a non-edge square to an edge square, it ...
56
votes
4answers
6k 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).
8
votes
2answers
806 views

Eight queens on the chessboard with mirrors

A 8-by-8 chessboard has two mirrors added on its left and right margin. The mirrors reflect the queen moves so that a queen threatens additional squares on the board. A queen threatens all squares in ...
5
votes
3answers
432 views

Chess Themed cryptic clues

In honour of the fortnightly topic challenge, here are some cryptic clues that refer to chess: Chewed after leg. It's risky (6) Ace a piece (6) Show where Arthur lived (6) Hint:
18
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3answers
1k views

Questions about grandpa (with chess puzzle clue)

Here are two questions about my grandpa Herb, along with parts of the answers. Can you complete the answers to both questions? Q: Who was grandpa Herb's favorite president? A: he gOeS By ... ...
14
votes
1answer
1k views

Replace a piece to checkmate

Nina, playing white in the diagram above, stared down at the board. Two black pawns were close to promotion, and Nina's position was utterly hopeless. "If only I could replace that piece," Nina said, ...
16
votes
2answers
755 views

Are you more clever than Alice?

Once upon a time, Bob was telling Alice about a chess match: "One turn before the end only 4 pieces were on the board, and White could guarantee checkmate for themselves in several ways". Once Alice ...
23
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2answers
2k views

A Chess Puzzle With a Twist

You enter a chess club and see pieces arranged on a board like this: Someone tells you that 2 players were playing a game (according to standard chess rules). At the end white announced a mate in 4, ...
17
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4answers
1k views

Copycat Chess (Part 3/3)

After finishing the mating move in the second game, Li Chai looked at the mandarin and asked: What do you say now? Kao Tse answered: It's not much of an achievement if you take my mating piece. ...
16
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2answers
1k views

Copycat Chess (Part 2/3)

The mandarin stared bewildered on the chess board after Li Chai finished his winning move: But it didn't last for long. He grabbed his queen and repeated Li Chais last move while announcing: What ...
18
votes
1answer
1k views

Copycat Chess (Part 1/3)

This puzzle series is based on a chess story from the year 1934. It is also the first entry for the new fortnightly topic challenge. Li Chai was known as the best chess player in all villages in the ...
15
votes
3answers
804 views

Highest number of mates

In chess, what position has the highest number of checkmates in 1 move for a given side? You can have as many of each piece as you want, except for the king (you get exactly one). Bishops can be same ...
2
votes
1answer
276 views

Crippled King Crossing a Canyon - Up and Down

Please don't flag me. I am not a duplicate of Crippled King Crossing a Canyon. What are the chances now, if the crippled king only can't walk up and down? The rest of the rules are the same as ...
3
votes
1answer
479 views

Black and white queens on an 8x8 chessboard

What is the largest number of queens that can be placed on a regular $8\times8$ chessboard, if the following rules are met: A queen can be either black or white, and there can be unequal numbers ...
4
votes
1answer
148 views

2 Knight Checkmate [closed]

Is it possible to have a two knights + king vs king checkmate if the king is very smart? I know that if the king goes to the corner, it is possible to checkmate, but is it possible to checkmate in any ...
7
votes
1answer
264 views

Checkmate with Pawn and King

Is it possible to checkmate an opponent with a king and a pawn without the pawn promoting to a queen or rook? I've heard that it is possible, but I don't know what the strategy is.
41
votes
1answer
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. ...
9
votes
2answers
218 views

The match between the seventh and the eighth player

12 players took part in a chess tournament and any two of them played exactly one match against each other (1 point for victory, 1/2 point for draw, 0 point for loss). After the tournament the top-...
25
votes
2answers
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 ...
20
votes
1answer
966 views

The Black Prowler (chess)

The Prowler is a powerful piece in an alternative version of chess. In the standard board depicted below, we have an initial setup of white pieces and just one black prowler. The special rules are ...
27
votes
1answer
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?
6
votes
2answers
515 views

Create an impossible knight transformation

Some examples: Desegregate the Knights and Switch The Knights You must give two 8x8 chess board positions that have any number of black and white knights. Both boards must have the same number of ...
20
votes
2answers
1k views

Desegregate the Knights

You are given a 3 by 3 chessboard with a knight on each corner, where the knights in the top row are black and in the bottom row are white. On each turn, you may move a knight of either color (the ...
29
votes
5answers
3k 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 ...
9
votes
2answers
498 views

Trapping pieces on an infinite chessboard

Alice and Bob are playing an unusual game of chess. We begin with a piece on a square of an infinite chessboard. On each of her turns, Alice moves the piece. On each of his turns, Bob destroys a ...
3
votes
1answer
122 views

Pawn-free squares

The chessboard below contains two pawns. How many squares (of any size) does not contain a pawn?
14
votes
1answer
988 views

A chic party puzzler

(Based on this puzzle by Gamow. The answer there might give you a hint (so don't look yet!)) At a fancy party in Café la Tour, everybody is friends with exactly 14 of the other people present. ...
7
votes
1answer
592 views

Queens on a Board with Two Players

Alice and Bob decide to play a game. Alice goes first. They will take turns placing queens on a chessboard such that the queen is not threatened by any other queen on the board. Both players play ...
12
votes
3answers
2k views

The knight's game

Alice and Bob play the following game on a standard $8\times8$ chessboard. In the very beginning, Alice picks a square on the chessboard and places a knight on this square. Then Bob and Alice ...
17
votes
2answers
1k views

Shortest forced mate if black has no pieces

Assume that black starts with just the king on e8 and white has all her pieces in the normal opening positions. What is the shortest forced mate for white?
6
votes
1answer
649 views

3D Chess Cube - Queen Puzzle

The basis of this puzzle, is based on a common 2D chess puzzle, where you try to fit 8 queens on a chessboard without the queens being able to attack each other. Extend this concept into a 3D cube (...
10
votes
1answer
1k views

Fastest Checkmates

I'm not very good at all at chess, but was thinking about some interesting chess variations and thought of this question. It is well known that the fastest (i.e. fewest moves required) checkmate is ...
46
votes
2answers
3k 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 ...
10
votes
3answers
1k views

Chess Game of Life

A bishop and a rook, of opposing colors, start on opposite corners on the same side of a chessboard, oriented as in the following picture: They then proceed to play a game of cat-and-mouse. Rules ...