Why is this a draw?
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It’s stalemate.
Lol
I'm not sure if anyone has mentioned this, but you know what, it's a staleymatey.
I believe it's a stalemate.
It is a stalemate. Black at the ending position has no legal moves. Even if your opponent has less pieces than you, or no pieces at all, stalemate always results in a draw regardless of who's ahead in material or time.
You are the 10th person in this thread to point out that it is stalemate. You win a prize. Congratulations.