Why is this not a checkmate? I thought I had the king surrounded

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zakbuttery

ahh yeh, happens to the best of us dw, for a checkmate the king has to be under attack, here he is not under attack but cant move cus anywhere he goes he will be under attack, so your opponent cant make a move and a stalemate is called which is a draw

ReincarnatedDragon

His king is not in check. But he got no available legal moves. Hence a stalemate.