Why is this an invalid notation?

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Why is this a brilliant? I’m only 300 elo

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I managed to checkmate by promotion for the first time and with a knight!!

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Cool Mate in 9 that I found in game

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First Brilliant move!

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Why is this brilliant

What about it?

I took pawn with bishop

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Nice little knight and pawn checkmate, I’ve not seen one like this before

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Find the best move?!

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Can someone explain this brilliant?

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How does white win these type of positions? White to play, engine says +3 but I can't find any winning lines

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Finally reach 700 elo lets goo

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