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Fwiffo: At a minimum 2 sets of black and 2 sets of white. The combination of piece exchange means you will never have more than 4 knights/bishops/rooks or more than 2 Queens on the board. The addition of promoting pawns does add more to this, which is no more of a pain than with regular chess sets. To cover 90% of promotion cases, 3 sets of white and 3 sets of black should cover it?