Questions tagged [chess]

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

Filter by
Sorted by
Tagged with
2
votes
3answers
286 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 ...
2
votes
2answers
164 views

Chess Construction Challenge #D: 8 moves

Since I "burnt" the complete question elsewhere, let's start with "D" (I counted up in hex) and 8 moves. The position in the answer there can be improved by far! OK, to ...
3
votes
1answer
117 views

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 ...
6
votes
1answer
552 views

Flat share share

This is a sequel to Gentrification in Chessshire. Due to the febrile state of the Chesster housing market you and your flat mates are forced to rent out half your place to another group of sharers. ...
7
votes
3answers
496 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 ...
9
votes
5answers
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 ...
-3
votes
1answer
108 views

Room Puzzle, containing chess and ciphers. Can someone help? [duplicate]

I Have to force checkmate black king in two moves only its white turn. And the keypad Someone also asked this question here like a month ago, but the answer was wrong i tried alot of things but ...
10
votes
2answers
308 views

Gentrification in Chessshire

You can skip the back story and directly jump to the question. Capitalism has arrived in suburban Chesster the community most famed for The Game, and with a vengeance. Rents have trebled in less than ...
15
votes
1answer
314 views

Chess A Knight's Journey

You'll need to know about: A game that has existed for over 1500 years A game that doesn't exist ♞ → I → II → III → ... Answer = Xxxxxxxxx
1
vote
2answers
105 views

Checkmate Puzzle [closed]

I had a chess position today, in which my last position had 5 possible moves to checkmate. This seemed like a lot to me, and I immediately thought of the puzzle: Which position would yield the maximum ...
3
votes
0answers
197 views

One vs many. Can white force a draw?

On an infinite chessboard there's a single white king and N black kings. The nearest black king must be K moves away from the white king. Given N, white dictates the value of (finite) K, then black ...
-1
votes
1answer
229 views

Chess-based escape room [closed]

You go into a room, and the door closes. Some sign says: You must find a forced checkmate on the black king in two moves. The key for the Vigenere is ONLY your moves. In other words, if you played ...
11
votes
3answers
1k views

Swapping 3 knights in a 4x4 grid

Can you swap black and white knights in this 4x4 grid? There is one important constraint: at no point can a knight be under attack by an opponent knight. Knights move using standard chess moves (L ...
9
votes
1answer
152 views

Interchanging knights and rooks… again!

Is it possible to interchange the positions of the the two black knights and two black rooks with those of the two white knights and two white rooks? Movements allowed are those of the corresponding ...
24
votes
2answers
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 ...
10
votes
2answers
682 views

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 ...
8
votes
3answers
969 views

(Almost) all hands on check

Historical note (skip if you like): In this interesting puzzle @TSLF asks for the "maximum number of black and white pieces that are involved in a checkmate position". Originally, they left ...
2
votes
5answers
364 views

Checkmate in Last Move

What is the maximum number of black and white pieces that are involved in a checkmate position? That is, if any piece were removed from the board, the position would not be checkmate because that ...
6
votes
3answers
449 views

Only kings and horses

This is the fourth entry in my decentralised or "Swiss" chess mini series. See bottom for a recap of the modified rules of Swiss chess. Enough warm up! It is time for a proper Swiss chess ...
4
votes
2answers
219 views

Fools in Switzerland

This is the third question of my mini series on decentralised chess, or Swiss chess. In Swiss chess, the advantage in terms of mobility of a centrally placed piece over a piece in the corner is ...
1
vote
2answers
204 views

Four pacifist queens

Earlier, I introduced the beautiful game of Swiss chess. These are animated gifs. You may have to click on them to make them move. Unlike the peace-loving Swiss, we are interested in "domination&...
5
votes
1answer
259 views

Four queens on public transport

The enlightened but, sadly, fictional country of Switzerland has it all: A strong democracy that resists centralism, a reliable public transport network and its own version of chess. Swiss chess ...
5
votes
1answer
486 views

Chess - Knight Mate

What is the fastest, in terms of moves, for a legal game to come to a checkmate, either black or white with a Knight and such that both all other cases of the checkmated King are attacked by an ...
12
votes
1answer
207 views

Three white queens, two white knights, and one rook on a chess board

On an 8 x 8 chessboard, place three white queens, two white knights, and one white rook so that every cell of the board is under attack by at least one piece not standing on it. Source: https://www....
4
votes
1answer
344 views

Two knight tours on a 4x4 grid

Two knights are placed on opposite corners of a 4x4 grid. Can you move* each knight 7 times, such that each cell of the grid is visited exactly once by exactly one of the knights? *Note that a knight ...
1
vote
2answers
233 views

Minimize the longest King chain on a 6x6 ternary grid

This puzzle is an extension of this one: Minimize the longest King chain on a 5x5 binary board Given a grid filled with numbers, we define a King chain to be a path on the grid such that: The path ...
0
votes
1answer
128 views

Minimize the longest King chain on a 7x7 binary grid

This puzzle is an extension of this one: Minimize the longest King chain on a 5x5 binary board Given a grid filled with numbers, we define a King chain to be a path on the grid such that: The path ...
4
votes
1answer
146 views

Chess - I will eat!

Suppose that you are playing White, and your aim is to eat a black piece (pawns qualitfy) in the fewest moves as possible and Black are not cooperating at all, and, even more, Black's aim is to ...
1
vote
1answer
93 views

Reverse Engineer Chess Software Calculations

TLDR Just the Puzzle Given a number n and a weight w the function f will result in a weighted number r as follows. f(n, w) = r n can be a number from 0 to 200 w can be a number from -100 to 100 (...
2
votes
0answers
97 views

Selfmate In How Few? #3-Unknown Limits

I dug up the below old position when going through a Google Docs document today. I know that it's supposed to be a somewhat winding, clearly dualed, selfmate. To be honest, I genuinely don't know the ...
13
votes
7answers
846 views

Minimize the longest King chain on a 5x5 binary board

Given a grid filled with numbers, let's define a King chain to be a path on the grid such that the path can be traversed with chess King's moves (moving to one of 8 adjacent cells at a time), the ...
5
votes
1answer
215 views

Chessdoku Level 1 (beginner)

I just tested out a new type of puzzle here (sorry if there's any confusion with the titling) called Chessdoku! Welcome to level 1. Here's the grid: Your goal is to get one black and one white piece ...
13
votes
1answer
402 views

Chessdoku Level 0 (trial)

Welcome to Chessdoku! It's like Sudoku but chess! This is level 0, so it's a trial run and will be fairly simple to solve (level 1 has been posted here). This puzzle is just for the concept. Here you ...
10
votes
1answer
845 views

How many queens so every unthreatened vacant square traps a knight?

How many queens does it take at minimum to occupy an empty chess board, so that whichever vacant and non-threatened square you put a knight on, the knight won't have a square to go to that is not ...
10
votes
2answers
463 views

Sixteen chess pieces on a square board

It is well known that the eight main chess pieces cannot cover a chess board. Suppose I have two sets of the eight main pieces. What is the size of the largest chess-like square board all of whose ...
48
votes
4answers
4k 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 ...
5
votes
1answer
177 views

Anti-Chess Squares

Playing regular rules for both white and black try to eliminate all the square formations by black and/or white. From the above starting setup all rooks form a square. Also white's queen rook pawn, ...
4
votes
1answer
101 views

How many queens are needed to attack all white squares?

This question: How can 3 queens control the white squares? got me thinking... What is the fewest number of queens needed to attack every white square? Rules: Only queens allowed Every white square is ...
14
votes
2answers
2k views

Three queens and two rooks covering the chess board… again!

Three queens and two rooks can be placed on a chess board so that all empty squares are under attack, as has been shown here: 3 queens and 2 rooks covering a 8x8 chess board. What if we require that ...
7
votes
2answers
906 views

21 knights covering a 11x11 chess board

Can you place 21 knights on a 11x11 chess board, such that every empty cell is under attack? Good luck! Here is a similar question for 10x10: Knights covering a 10x10 chess board
5
votes
1answer
833 views

3 queens and 2 rooks covering a 8x8 chess board

Can you place 3 queens and 2 rooks on a 8x8 chess board, such that every empty cell is under attack? Good luck!
6
votes
2answers
447 views

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,...
2
votes
1answer
186 views

Piercing Bullets

Under 30-secs. bullet time control the above position results after n moves. What is the fewest number of moves possible?
30
votes
5answers
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 ...
16
votes
9answers
3k views

A fun lateral-thinking Chess puzzle [closed]

Which famous movie is suggested by the following chess position (by Trevor Tao)?
4
votes
3answers
177 views

Experts at failure

Construction challenge: Find a position with the longest sequence of unique losing moves, i.e. white to move has one and only one move that will lead to a lost (for white) position. White makes this ...
9
votes
1answer
268 views

Chess Endgame Study

I came across this puzzle-like endgame study. Usually, opposite color bishops are draw-ish. Here's an absolutely extraordinary counter-example. Enjoy! White to play and mate in 8. Source: Winning ...
8
votes
1answer
518 views

Doubly Pure Checkmate

A pure checkmate is a checkmate where for each square the king might go to, there’s exactly one reason it can’t. The famous Légal mate is one example, so is a KR vs K checkmate. What’s the minimum ...
1
vote
1answer
123 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 ...
8
votes
2answers
283 views

Black board attack

How should Black move as to attack all the squares that have no piece on them with only ten legal moves for black? Any unoccupied squares must be attacked. Start from the position above as shown.

1
2 3 4 5
11