Learning Opportunities

This puzzle can be solved using the following concepts. Practice using these concepts and improve your skills.

Statement

Cooperative mate is a family of Chess game puzzles where both sides cooperate towards a common goal. Here, we consider endgames with only black king, white king, and white rook, aiming to checkmating the black king. Your task is to provide a shortest sequence of moves leading to such mate.

The Goal

For a given state of the game, the goal is to compute a sequence of chess piece moves leading to the fastest checkmate.

Rules

The game state is described by the player-to-move and position of each piece: white king, white rook, and black king, formatted as white d5 g7 a6.

The goal of this puzzle is to provide a sequence of moves leading to a cooperative checkmate, according to the Chess rules. The sequence should be formatted as d5c5 a6a5 g7a7.

Victory Conditions

Given sequence of moves leads to the fastest checkmate possible in the current board position.

Loss Conditions

Given sequence of moves does not lead to a checkmate within a turn limit.
Given sequence of moves contains illegal move.
Given answer is not properly formatted.
Response time exceeds the time limit.

Detailed rules

Given board state is always a valid Chess game position.
You can hide showing legal moves in the settings panel ()..

Related puzzles

Adversarial variant of single rook endgames, requiring you to play as white against the black player, is available here.
To play full version of Chess as a bot programming game you can go here.

Game Input

Initial input

A single line containing space-separated strings, movingPlayer being either black or white, and whiteKing whiteRook blackKing positions in column-row format, e.g. a1.

Output

A single line containing a sequence of space-separated moves (each move in a1h8 format).

Constraints

1 ≤ solution length ≤ 12
Response time ≤ 20s

Solve it

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