Just Give Me a Chess Piece at the Beginning, How to Play?

Brain cancer patient Jun Qi's martial soul traveled through the parallel world and awakened his chess soul, and his... Also came! "Ha~ I thought you had become stronger, but it seems you still need me!" "Didn't you disappear?" "I never disappeared again!" This is a dark age! The introduction is too weak, please move to the main text! This book has a single female protagonist, and the protagonist and supporting characters have online IQs!