Thanks for your question!
A couple of thoughts. The best thing to do when you run into a question that asks you to change one of the constraints is to save it for last. This is usually one of the very last questions anyway, but you want to make sure it is absolutely *the* last question you do. That way you can modify your diagram without having to worry about changing it back afterwards.
The other thing you'll want to do is go back to the original phrasing of the constraints. You can't just change the one thing on your diagram that the rule directly refers to, because there can be all sorts of consequences for your inferences too. Unfortunately this is the one area where the more inferences you make, the more work you're going to have to do. I'd say this is especially difficult to keep track of in open assignment games, where very often lots of inferences are all working together.
Most of the time I don't think it's necessary to start completely from scratch, but you do have to keep an eye out for any inferences that would involve the constraint that's been eliminated. If it's a particularly interwoven game - with lots of inferences - it might just be better to start over.
I'm going to defer for a little bit as part of posting a diagram. Let me know when you've taken a stab at it, and then we'll take it from there
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