RE: Challenging a cat - theory and practice?
Personally, I'd put the Tiger Curl girl with one of the Soft Fold boys. You'd still have a 1-in-4 chance of success, and a 1-in-4 chance of another Soft Fold box which must also be hiding Puff. Your rejects would be the 1-in-2 chance of a Tiger Curl (which could hide either Soft Fold or Puff).
Doing the Soft Fold boy and girl still gives you a 1-in-4 chance of success, but your 3-in-4 Soft Fold boxes will be unknowns (1-in-3 will be 'pure', 2-in-3 will hide Puff, but you can't tell which is whatch).
To be honest, with your 4 boxes, I'd probably do both. That gives you 2 chances a week. Which, time-wise, means it's the same as if you had even odds of success. That's trading money for time, which can be an advantage.
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