My first response to this suggestion is this puzzle:
And this one:
Both of these the only winning moves are to promote to knights, whether 3 or 8 of them end up on the board. Feel free to check out my underpromotion thread for more examples of why sometimes multiple underpromotions are necessary, (one of which requires 5 consecutive bishop promotions!)
https://www.chess.com/forum/view/endgames/best-underpromotion-endgame-compilation
My 2nd response is what would you propose for the pawn instead? To stay as a stale pawn on the 8th/1st rank?
Uhmmm you do realise that that these are intended puzzles can be only solved if you have like 1000 bishops or something. It's just an exaggeration, so don't quote me on it. This particular puzzle will be invalid if the rule of the pawn promotion was restricted.
Well I propose, the pawns will just be sitting on the 7th or 2nd rank if all the pieces are still not captured. It will be another illegal move added to the game if the pawn promotes to the the pieces that exceeds the limit. I don't think you're quite getting what im saying. Let's say your one knight and two rooks get captured in the middle of the game, and then you have the pawn to promote. If you wish to promote, then you can only promote to either a knight or a rook because they are no longer present on the board. If none of your pieces get captured then you cannot legally promote. They sit on the 7th or 2nd rank until one of the pieces get captured then they can make a legal promotion.
My first response to this suggestion is this puzzle:
And this one:
Both of these the only winning moves are to promote to knights, whether 3 or 8 of them end up on the board. Feel free to check out my underpromotion thread for more examples of why sometimes multiple underpromotions are necessary, (one of which requires 5 consecutive bishop promotions!)
https://www.chess.com/forum/view/endgames/best-underpromotion-endgame-compilation
My 2nd response is what would you propose for the pawn instead? To stay as a stale pawn on the 8th/1st rank?