The Queen

Take the rook's straight lines, add the bishop's diagonals, and you get the queen: the strongest piece on the board. She slides any distance in any of eight directions.

The queen on d4: the rook's four lines plus the bishop's four diagonals.

Count what that adds up to. From d4 the rook part covers 14 squares and the bishop part covers 13, so the queen attacks 27 squares, close to half the board from a single square:

All 27 squares the queen on d4 can move to in a single move.

Each player gets exactly one, and you already know where she starts: on her own color, d1 for White and d8 for Black. One warning to tuck away for chapter 8: because she is so valuable, charging out with the queen early usually ends badly. And for all her power, she obeys the same law as the rook and bishop: she cannot jump over anything, as the next lesson shows.