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If you're new to grid-based logic puzzles, this tutorial will teach you the basics. Start with the "Introduction" first, then move on to the tutorials discussing specific clues or solving methods. Each tutorial contains a number of different slides - you can advance to the next slide by clicking "Next slide" at the bottom of each page, or by using the circled numerical links below each slide. Choose your specific tutorial from the list below to get started.
Slide #1
Now we're getting into the "advanced" techniques!
A "pseudo-true pair" is a fancy name for a fairly simple concept. When two items in the same group have the exact same two options remaining in the same subgrid, we call that a "pseudo-true pair".
Why the weird name? You'll see shortly...
Slide #2
Check out the subcolumns (shaded in yellow) for Dillard and Rhodes in relation to months. This is a classic "pseudo-true pair." Dillard can only be January or February, and Rhodes can only be January or February.
Slide #3
We call this arrangement a "pseudo-true pair" because when it comes to Dillard and Rhodes and January and February, we have two vague true relationships "hidden" in the grid.
We know that Dillard can only be one of two months - January or February. If Dillard is January, then Rhodes is February - and if Dillard is February, then Rhodes is January. No other options are available, therefore Dillard/Rhodes and January/February are locked in a "pseudo-true" relationship. We don't know which is which yet, but we can use this relationship to uncover four new false squares.
Slide #4
No matter how the "pseudo-true" relationship works out between Dillard/Rhodes and January/February, we know that January/February cannot ever be paired with anyone other than Dillard or Rhodes.
Therefore we can mark five new false relationships on the grid:
1. Lee cannot be January.
2. Peters cannot be January or February.
3. Wood cannot be January or February.
Slide #5
There is one other pseudo-true relationship remaining to be found on this grid.
Do you see it?
(Hint: look at January and May in relation to the "call signs" group, including Sierra, X-ray, Yankee, etc.)
Slide #6
January and May are locked in a pseudo-true relationship with Sierra and Yankee. No matter how you parse the pseudo-true relationship, you know for sure that Sierra cannot be February, March or April, and Yankee cannot be February, March or April.
Therefore five new false relationships (in green) can be placed on the grid.
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