Frequently Asked Questions
When two pieces of the same type (like knights or rooks) can move to the same square, you need to specify which piece to move explicitly, such as Ngf3 or Rad8. You can enable the legal moves display in settings to help with this.
This service is provided free of charge, but maintaining servers and domains incurs costs. Ad revenue helps cover these expenses. Additionally, revenue from affiliate programs such as Amazon Associates is also used to cover operating costs. For more information, please see our Affiliate Disclosure.
The AI uses Stockfish 17.1 (Lite Single-threaded version).