Kevin Pacey wrote on Sat, Sep 15, 2018 02:51 AM UTC:
It may be worth noting that in the case of variants where promotions occur, and then only on one rank (the last one!?), it would not be good game design to allow underpromotion to a given piece type, if there can never legally arise a position where the underpromotion would in some tangible way be a better move to play than promoting to a piece type of higher value. However, at the moment I cannot think of a game that would break this principle, assuming it's ever possible to do so.
It may be worth noting that in the case of variants where promotions occur, and then only on one rank (the last one!?), it would not be good game design to allow underpromotion to a given piece type, if there can never legally arise a position where the underpromotion would in some tangible way be a better move to play than promoting to a piece type of higher value. However, at the moment I cannot think of a game that would break this principle, assuming it's ever possible to do so.