No UTXO already explained the only correct answer 

 What is “make a rook”? 

 When a pawn reaches the opposite side of the board the player can choose to upgrade to any piece 

 Ah. Thought you only could “choose” a queen. Learned another new thing! Thanks doc 🤙 

 Let’s play sometime! @TomekK and I want to get a nostr chess tournament going 

 I’d love that!! Sorry to ghost yesterday, had to crash. But hell yeah if there’s a chess crew, sign me up 

 Bro you be spanking !  

 do it 

 I won’t win but I will enjoy 

 I thought that was a bishop 😂😂😂 

 https://media.tenor.com/3Wzt5UyrWA0AAAAC/the-bishop.gif 

 (I’m assuming the stalemate is only because king<>king is illegal, whereas forcing the king to move to pawn is ok)