# Sapphire Chess v0.9.0

Welcome to Sapphire Chess!

This is a chess game written in pure Ruby v2.7.5. Other versions have not been tested yet.

Please, visit https://medium.com/@lucas.sorribes/nostromo-my-ruby-chess-journey-part-i-7ef544b547a5 for a very detailed account of how I wrote this game.

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## Current Features

* A beautiful board with easy-to-distinguish colors for white and black pieces.
* Fully functional AI
* Two game modes: human vs. computer, human vs. human.
* Three levels of difficulty.
* Full chess movement rules implementation, including castling and *en passant*, for both the human and the computer player.
* Accepts algebraic notation for movements, with human input validation.
* Material score display.
* Player's last move display.

## Screenshot

![Game screenshot](./screenshot.png)