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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12
votes
3answers
1k views

Chameleon 8x8 Tour

It is known that a knight can visit every cell of a 8x8 chess board exactly once. Here we consider the same task for a chameleon chess piece. This piece begins as a knight, then it transforms into a ...
5
votes
1answer
294 views

Compass: a chess puzzle

]7=6QW> ?@ W=6P ==Ik ]P@QQ67@PN [RQ2N 69R P@7 WPP@$ Black to move. Are they winning?
29
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6answers
3k views

White is winning here. But how?

White to move. This puzzle is composed by myself!
7
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2answers
621 views

Inferrence strategies for hidden pieces on a chessboard

This is a potentially off-topic question, however, the reason I'm asking it here is in the hope of gaining the perspective of puzzlers in tackling such a problem. That is, I am more interested in the ...
0
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2answers
215 views

Checking Centered Knights

The standard chess end game position above most probably results in a draw. On his turn White player placed the bishop to f5 and say "checks" (board pieces as shown). How can the Black ...
6
votes
4answers
256 views

Pawns and kings, what is the optimal play for white?

White to move. Source: wu riddles
2
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1answer
657 views

Can you check the results of this chess match?

As the sun broke the horizon I could feel the cold breeze on my face mixing with the warming city air. Like most mornings, I could hear Mr. and Mrs. Shamming discussing their afternoon plans during ...
4
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2answers
405 views

Longest chain of checks and captures

On a standard size chessboard, with white to move, make a configuration of chess pieces and moves, so that with every move by white the black king repeatedly becomes checked. With every move black ...
11
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3answers
1k views

Attacking diagonal queens

What is the least number of queens you need to place on the main diagonal of a 8x8 chess board such that every square is under attack?
5
votes
1answer
205 views

Can you destroy the kingdom without getting caught?

You are a shapeshifter that takes on the form of their victims and you've infiltrated the opposing kingdom's ranks, disguised as a lowly pawn . The opposing king has you presently assigned to the ...
6
votes
1answer
139 views

White to play and mate in 3 - adapted from real game

This is adapted from a real game between GMs where white played the King's Gambit. I changed the position slightly (moved one piece) because there were actually two mates available, with one more ...
0
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1answer
89 views

The Knight's Trial [duplicate]

You've most likely heard of the eight queens puzzle, right? Where you have to place n chess queens on an n * n board so that no queens attack each other (boy, those must be some very angry monarchs!)? ...
5
votes
1answer
217 views

Jumping leprechaun on a grid

A jumping leprechaun is a special chess piece that lives on an infinite square grid. On the first turn it moves one cell horizontally (left or right) and two cells vertically (up or down). On the $n$-...
8
votes
2answers
288 views

What pieces does White need to beat Black's veto?

Consider the following chess variant: before each of White's moves, Black chooses one move which White is not allowed to make. (The rules for which positions constitute checkmate are unchanged - Black ...
6
votes
1answer
397 views

The Novice Chess Team that Won Every Match of the Season

Devious High School had a newly formed chess team that played against all the other high schools in the area this year. These matches are played with a 5-player team who, at a match, sit next to each ...
2
votes
3answers
484 views

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 ...
5
votes
3answers
1k views

One-sided chess: Self stalemate revisted

An old self-stalemate puzzle has been popping up in my feed lately. I was unable to do better than the existing answers, so I created a different puzzle from it. For reference: One-sided chess: Can ...
0
votes
1answer
170 views

Puzzle storm to infinity

I have been playing Puzzle Storm on Lichess lately. Essentially it involves solving chess puzzles within a given time limit. Additionally, the player gets a time bonus for a certain number of moves. ...
3
votes
3answers
319 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 ...
3
votes
2answers
177 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
135 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 ...
5
votes
1answer
577 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
510 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 ...
-4
votes
1answer
127 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 ...
9
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2answers
346 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
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1answer
347 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
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2answers
116 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 ...
4
votes
0answers
238 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
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1answer
275 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 ...
12
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 ...
10
votes
1answer
170 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 ...
25
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 ...
11
votes
2answers
725 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
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3answers
991 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
383 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
473 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
242 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
216 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
287 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 ...
6
votes
1answer
501 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
225 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
363 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
245 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
136 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
173 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
113 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 (...
5
votes
1answer
196 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
866 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
229 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 ...

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