What is the minimum number of pieces needed in a chess set to account for all possible promoted pieces? How many pieces would be needed in a chess set where all possibilities for promoted pieces are included if pawns are no longer used after they promote?
Let's count.
Starting set

2 rooks
2 bishops
2 knights
1 queen
1 king
(8 pawns)

Max promotions

8 rooks
8 bishops
8 knights
8 queens

Total
In total you would need 40 pieces and 8 pawns for each color, so 96 units for black and white together.
Edited to bullet format to &quot;look&quot; better.