The Importance of an Appropriate Promotion
Logic
Level
3
It is White's move. What must white play in order to mate in two ?
Clarification: Black plays optimally.
This is the third problem of the set Mate .
a7
Kd7
c8=R
c4+
c8=N
c8=B
e6
c8=Q
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1 solution
White plates c 8 = B ! ! . This forces black to play K c 6 then white plays B b 7 # checkmate or K c 4 then white plays B e 6 # . This is a good example of underpromotion .
Note: A queen promotion would result in a stalemate which is why it doesn't work.