I read somewhere that in the 19th century the chess master Mackenzie played a masterpiece where he underpromoted about 4 times. I don't know the opponent or the game. It might hold the underpromotion record if I recall from a Chernev book.
Do rated games with 3N 3 B or 3 R exist?
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Of course the three pieces belong to one side :) and the extra piece had been obtained by underpromotion