ideas:
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find the real knight. Clone Wars? - basically find the knight that matches a set of rules (more complicated per level). e.g. "the real knight is on an even rank", or "the real knight is forking at least two pieces" or "the real knight is being attacked by a bishop"
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get achievements looking as neat as this? https://codepen.io/simeydotme/pen/abYWJdX