Start with a sentence, as dramatic or mundane as you like, then change just one thing about it. A spelling or punctuation mark, take one word out, put one word in, etc. When the sentence can't take any more alteration, start another. At some point, we will get to a sentence that contains the standard winning move.
Was Boris a mayor who latterly cheated so that a simpleton in an hysterical swoon must be promoted on a whim? [Everyone: when I set up the game, I didn't give a lot of thought as to how far the mutation should or could go before we called time on it and started a new one. This one is now, I think, unrecognisable from its starting point. Is it time to start a new one or are we still just having too much fun with it? Personally, I would be in favour of a new round. Comments welcome.]
Was Boris a mayor who latterly cheated so that a simpleton in an hysterical swoon might be promoted on a whim? This isn't a vote, just changing one of the few bits left from the original. A new one would be fine.
Was Boris a mayor who latterly cheated so that a simpleton in an hysterical fit might be blackmailed on a whim? Nah! Let's keep going till its total bollocks :o)
Boris was a mayor who latterly cheated so that a simpleton feigning an anaphylactic fit might be blackmailed on a whim. I agree with Kim, and submit that the new line should be introduced when every word (or close to) of the original has changed. Or when we get bored of the current one.