If I've been given the full state every move, I will _never_ make an illegal move as a 1400 chess player.

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> O-O > I'll play O-O as well. Your move.

Do you really think that this error would have been made at 1400 Elo? Even in blind chess? This is the 5th move of the game. I can still track the game at this point mentally.

I recognize that you're 1900 and think that all the chess players below you are n00bs, but... come on. 1400 players are stronger than this.