Non-destructive testing describes recoverable ways to feel out your floor and see what they can do, without breaking squares. These are notes about non-destructive, or at least less destructive, testing.
Thanks to Larry Marchese, Don Beck, and Rick Hampton for insight on these.
See also Don Beck's notes on non-destructive testing
Mainstream
Heads Star Thru, Double Pass Thru, Cloverleaf - either paired couple in the middle beginning DPT, or BBGG lines. If the latter, slide thru, centers go twice, and you're home.
Plus
Heads square thru 4, RLT, touch 1/4, follow your neighbor, see who spreads, explode and slide thru.
Heads square thru, right and left thru, veer left, crossfire, girls run, veer left, crossfire, boys run, should be zero box. If first crossfire tanks, the second one is going to crash, if they do both, then pretty comfortable with floor having a better than average knowledge of plus.
Heads Square Thru 4, spin chain the gears, if the majority of the floor is not exchanging, hinge, follow your neighbor... AL., if they get it right, you got it right. Promenade 1/4 home. If they exchanged, Acey Deucy plus Right and Left Thru to corner box, 1/2 out.