Because your opponent can't move, but is not in check. That's the definition of stalemate, which is not the same as a draw, but a special kind of draw.
How this game ended as Stalemate?
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Because your opponent do not have any legal moves (your opponent only had a king but can't move it without putting it in check,therefore having no possible move to play) but was not in checkmate. In this cause, the game is drawn by Stelemate
Jun 1, 2021
0
#4
Thank you! I had to just checkmate but I was playing really fast at that moment.
Preventing a stalemate will add complexity to the game from now on.
Hello, I'm new to chess. But I really don't understand how I was not able to win this game.
After I made the last movement the game went 1/2 - 1/2 and I don't understand why.
https://www.chess.com/game/live/16287377685