Chess is a strategic game played with two players on a checkered grid. This tag is for challenges related to chess or any derivative of it.

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13
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8answers
812 views

Chess Tournament

This is a chess-KOTH with simplified rules (because chess itself is already complicated, playing it via a simple program doesn't make it easier). At the moment it is limited to java (version 8), but ...
1
vote
1answer
396 views

Domination problem in chess

Given an mxm chess board, find a minimum number of pieces of the given kind and place them on a chess board in such a way that all squares are either occupied or attacked by at least one piece. Input ...
3
votes
0answers
204 views

Write the shortest code that bring to a solution of “The old curious knight with a lazy horse” problem [duplicate]

The Story: Once upon a time there was a curious Knight that lived on a never used chessboard in the Realm, an antique store. He spent all his career over there and when it came the moment of the ...
25
votes
12answers
2k views

Tell me the moves

Jack and Jane decided to play a game of chess to while away time. Unfortunately, Jack is rather bad at visualizing. He finds it tough to figure the moves possible for a given piece other than a ...
14
votes
3answers
882 views

king + rook vs king

It's the ending of another well played chess game. You're the white player, and you still have a rook and your king. Your opponent only has his king left. Since you're white, it's your turn. Create a ...
22
votes
13answers
2k views

Smallest chess board compression

Write an algorithm or program that can encode and decode a chess board. The goal is to make the smallest representation of a chessboard that could be used (once decoded) to determine all movement ...
5
votes
7answers
431 views

n-queens problem, displaying more than one solution available

as some of you may know, n-queens problem is a set of algorithm puzzle that given a 'n x n' where n is the board size of a (let's say) chessboard, and the main goal is for the n queens (where n is the ...
3
votes
0answers
373 views

Simple chess bot

Inspired by this Implement simple chess bot (with console or GUI) that has following features: [Pseudo-]graphically showing the board; Accepting user moves and making their own moves; Playing by ...
5
votes
7answers
317 views

Chess960 position lookup

This is a follow-up to Chess960 position generator. In Chess960, there are 960 possible starting positions that can be enumerated from 0 to 959 (or, at your choice, from 1 to 960). The enumeration ...
10
votes
6answers
610 views

Chess960 position generator

Context Chess960 (or Fischer Random Chess) is a variant of chess invented and advocated by former World Chess Champion Bobby Fischer, publicly announced on June 19, 1996 in Buenos Aires, ...
4
votes
9answers
715 views

Eight Queens Obsfucation

You've probably heard of the classic Eight Queens Puzzle. For those of you who haven't it goes something like this: Position 8 queens on an 8×8 chessboard so that no two queens threaten each ...
6
votes
6answers
604 views

Neustadtl score

Write the shortest function that takes a two-dimensional square array representing the scores of a chess round, and outputs an array of the Neustadtl scores of the players. The two-dimensional array ...
6
votes
1answer
533 views

chess - calculate all legal moves from fen string ignoring castling and en passant

Write the shortest code that calculates all possible (legal) moves of current player from a given FEN string. What is FEN string? (Wikipedia) Shortest code wins, language doesn't matter. Output ...
5
votes
1answer
373 views

The smallest Chess arbiter

Write a program, which, upon gazing at a chess table, can say whether there is a check or a checkmate. Input: a chess table in text form, the last line of the input being the first rank (the starting ...
6
votes
4answers
1k views

A simple Knight's problem

How many ways are there to place a black and a white knight on an N * M chessboard such that they do not attack each other? A knight can move two squares horizontally and one square vertically, or ...
1
vote
7answers
868 views

Knight's tour on a rectangle

Given an a-by-b sized grid, and a chess knight, determine: A starting point and path the knight can take to visit every square in the grid or "NOT POSSIBLE", if not possible. Input: Two integers, ...
11
votes
3answers
930 views

Play a valid chess move, given a board on stdin

The program plays white. Example stdin: 8 ║♜ ♞ ♝ ♛ ♚ ♝ ♞ ♜ 7 ║♟ ♟ ♟ ♟ … ♟ ♟ ♟ 6 ║… … … … … … … … 5 ║… … … … ♟ … … … 4 ║… … … … … … … … 3 ║… … ♘ … … … … … 2 ║♙ ♙ ♙ ♙ ♙ ♙ ♙ ♙ 1 ║♖ … ♗ ♕ ♔ ♗ ♘ ♖ ...
4
votes
2answers
365 views

Build a working chessboard

The challenge Create a program that mimics a chessboard. The datails The chessboard must be surrounded by the labels of each row and column, being the columns labeled from 'a' to 'h' and the rows ...
3
votes
1answer
724 views

Determining the winner of a Chess game

Challenge Being someone who plays far too much chess in his spare time, I thought I'd set a code golf challenge inspired by the game of chess (with a software flavour), for those interested. The ...
4
votes
1answer
405 views

Set the chessboard

Objective Given an arbitrary chessboard as standard input (in which each piece is on a square), produce as standard output a list of moves needed to regularize, or set up, the chessboard. The moves ...
16
votes
1answer
870 views

Chess endgame: White to Mate In One

Given an 8x8 grid of letters representing the current state of a game of chess, your program's task is to find a next move for white that results in checkmate (the answer will always be mate in one ...
3
votes
2answers
266 views

How many squares are guarded by chess queens?

Today marks the 15th anniversary of Garry Kasparov's defeat against Deep Blue. Speaking of chess... Input is a string that represents an 8x8 chess board containing only empty squares (.) and queens ...
9
votes
4answers
1k views

N-Queens problem

In chess, a queen can move as far as as the board extends horizontally, vertically, or diagonally. Given a NxN sized chessboard, print out how many possible positions N queens can be placed on the ...