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Black has no legal moves because of the knight but they aren't in check
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The rook doesnt attack the king because N6 is in the way.

So black is not in check and has no legal moves, so stalemate.

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Isnt that a forced move to K8? The king is forced to take N6 or move to K8, either of which results in a capture.

Isn't this the definition of checkmate, not stalemate?

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The relevant rule from standard chess:

> Leaving one’s own king under attack, exposing one’s own king to attack and also ’capturing’ the opponent’s king are not allowed.

N6 and K8 both expose the black king to attack, so black is not allowed to make those moves. And with no other options, black has no legal move.

And since black isn't in check where they are right now – that's a stalemate.

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King isn't allowed to move to a square that would put him in check, so there are no legal moves available. Chess rules.
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