Single Concentric is a 4-person version of Concentric. It is applied to
2-person calls.
\sxhlines{b2s,g1n,g2s,b1n}
\sxvlines{b1w,g1e,g2w,b2e}
before Single Concentric Shazam
after
\syhlines{b2n,g2s,g3n,b3s}
\syvlines{b2w,g3e,g2w,b3e}
before Single Concentric Shazam (not the same as Concentric Shazam)}
after
Grand Single Concentric has the center 2 work with each other in the very center,
the next 2 work around them, and so on.
Single Cross Concentric is the obvious thing. On Grand Single Cross Concentric,
the center 2 do the call and go to the very outside, and so on. The rule
about "let the centers do the call first and get out of the way" applies very strongly
here.
\begin{displaydance}
\sxhlines{b2s,g1n,g2s,b1n} & \syvlines{b3n,g4s,g3n,b4s} \cr
\cbox{before Grand Single Cross Concentric\\Single Turn and Deal} & after \\
\end{displaydance
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