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What if you start a game with a non-standard board configuration, though? Now your low entropy midgame snapshot won’t look quite so chessy, despite having no more entropy than before. What would make those keys easy to find?
probably still quite predictable. Shuffled backrank (Chess960) only has 959 fresh starting positions. Enough to confuse humans out of opening prep but not much for machines. You'll still end up in pretty regular, well-trodden middle games I'd think.
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Ok, but maybe the distribution of pieces are different as well as their placement and the game is being played by 6 year olds rather than experienced players.
That’s like adding entropy, but not exactly. The game itself would be similarly limited to common games, while guessing which game is being played converges to impossibility.
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Let’s dig into the chess analogy a little.
Imagine you base your seed phrase on the configuration of a particular chess board.
An attacker doesn’t have to know that you did that to know someone might and they may decide to search particularly chessy seeming addresses. Fine, that’s not great for security.
What if you start a game with a non-standard board configuration, though? Now your low entropy midgame snapshot won’t look quite so chessy, despite having no more entropy than before. What would make those keys easy to find?