From a 2 x 2.
Leaders Box Circulate twice and 1/4 In (Box Transfer)
as Trailers Box Circulate, 1/4 In, and Box Circulate.
Ends in a 2 x 2.
Original Trailers can not Roll. Single Checkmate is the Single version of
Checkmate The Column [A2].
Note that on Checkmate The Column, the Trailing two cannot Roll since their last
part is to Step Ahead.
Single Checkmate has historically been known as
Split Checkmate when done on each side
and Box Checkmate when done in the center
or from a Box.
Cheat: Box Counter Rotate 1/4; Box Circulate. This cheat
emphasizes that only the original Leaders can Roll. Some other
glossaries list a similar cheat (Box Circulate; Box Counter
Rotate 1/4) which makes it seem as if everyone can Roll.
Checkmate The Column [A2] (H.P. Williams 1975):
First Two Circulate 4 spots &
1/4 In as Last Two Circulate twice, 1/4 In, & Circulate.
Normal Columns end in Parallel Two-Faced Lines.
See also Single CONCEPT [C3A,C3B,C4].