When a pawn marches to the last rank, usually it gets promoted to queen. It is quite natural to do this as the queen is the most powerful among all the pieces. However there are times that the pawn may be promoted to other pieces, especially knight that could win or save a game. Most popular amongst all the reasons for doing this is the immediate gain of tempo using a check or a threat. A few examples are given below. You may use your imagination and creative skills to list various cases, where it is advantageous to under promote.
Sloth,J (2200) - Bjerre,T (2320) [A01]
restricting White with one good move to choose from the unusual under promotion
as in the text or 32.Bb2 to stop the Black queen and rook dominating. [31...Kg6
extends the mate by a couple of moves but offers White whole heap of good moves to choose from! 32.Qe8+
Parameswaran,T (2390) - Ravi,L (2390) [D03]
promoting to queen leads to draw with many chances to slip in to defeat! 33...Rh1+
(NO..no.. is 35.Ke3
White gets checkmated!) 35...Rh1+
(Again not 36.Kd2
Black wins instead!) 36...R1h2+
leads to repeating moves and hence DRAW!]
Lamprecht,F (2395) - Petrosian,S (2375) [A57]
moving the Queen away from the action is inferior to several other moves but it offers a chance for White to commit a mistake!
Danielsen,H (2165) - Aagaard,J (2399) [B49]
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