Help with March 1, 2021 Daily Puzzle

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rskhalil
I was working through today’s daily puzzle and made it to the final move, and was stumped. The solution is 1. Bg7 Ka2 2. Bxb2 Nf4 3. g7 Ne6 4. g8=R. Can someone help me understand why we would promote to rook and not queen in this instance?
Dchessguy124

If you promote to a queen, it's stalemate!

 

rskhalil
Ohhh. Okay I see that now! Thank you very much
Dchessguy124

Yeah don't worry about it. I made the same mistake happy.png