New info: could be true/false | Quick guide

Could be true means that the statement in the correct choice is possible, even if it’s only once, without breaking any of the rules.

The wrong choices must be false—they break a rule in some way, when implemented.

Could be false means that the statement is possible to negate, even if it’s only once, without breaking any of the rules.

For these, the wrong choices must be true—they are always true in every acceptable circumstance, no matter what.

Since you are given new information here, a good method is to redraw the bare bones of your initial diagram (while keeping an eye on the other details from your initial diagram), so that you aren’t modifying your initial diagram with a condition that doesn’t necessarily extend to other questions.

Usually you can draw the new condition right into the new diagram, but sometimes you won’t be able to, and it’ll be a rule that you need to write down—even though you’re not sure yet where those elements go.

Make new deductions Sometimes that means that a block of elements will become bigger; sometimes it’ll mean that more elements can’t go into a certain place, etc.

It’s likely that the answer is immediately evident. If not, eliminate any choices that are clearly wrong.

Top tip: If only two choices remain, and you feel confident in your work so far, you can just test one of them—if it accomplishes what you need (whether it’s a could be true or could be false) then it’s the answer! If it doesn’t accomplish what you need, then the other remaining choice is the answer.