From Facing Couples (or a R-H Wave).
  - Right Pull By  and  1/4 In;
- Left Swing Thru;
- Left Turn Thru.
Ends in Back-to-Back Couples.
- Alternate definition:
- Square Thru but on the second hand Left Swing Thru 1 & 1/2; Step Thru.
Notes:
- 
Don't rush this call.  It's a long call, and has many parts.  
    It requires cooperation and teamwork.
- 
Square Chain Thru ends in Back-to-Back Couples.  As such, be sure
    to end back-to-back with the dancer with whom you do the Left Turn Thru.
- 
Upon completion of the call, join hands with the adjacent dancer to form a Couple.
- 
When teaching Square Chain Thru, We've found that a hard part is 
    for the original Beaus to wait while the original Belles Right Arm Turn
    1/2.  If you're an original Beau, stay
    in place and wait for the original Belles to Trade, then do the Left Turn Thru.
- 
Square Chain Thru starts like a Square Thru [Basic].  As 
    such, use alternating hands (Right Pull By and 1/4 In, then get ready 
    with the Left-Hand for the Left Swing Thru).
- 
As with all Turn Thrus, be sure to step Back-to-Back
    with the other dancer when you're done.  Look behind yourself to 
    verify that you are lined-up and back-to-back with that dancer.  If
    not, adjust so that you are!
- 
The end result of Square Chain Thru is the same as  
    Lead Right [Basic] or 
    Wheel Thru [A1].
Left Turn Thru [Mainstream] (Wayne Moyers 1964):
 From Facing Dancers or a L-H Mini-Wave.
  Left Arm Turn 1/2 then (drop hands) and Step Thru.  
  Ends in Back-to-Back Dancers.
Left Square Chain Thru [A1]:
 Start with the Left hand
  (i.e., Left Pull By and 1/4 In; (Right) Swing Thru; Turn Thru).
Split Square Chain Thru [A2]:
 From an applicable T-Bone 2 x 2, or other applicable formations.
  Those who can Right Pull By and turn to face the inactives; 
  all Left Swing Thru; Left Turn Thru.  
  Ends in Back-to-Back Couples.
Square Chain Thru To A Wave [C1]:
 From Facing Couples (or R-H Wave).
  Square Thru but on the 2nd hand Left Swing Thru 1 & 1/2.
  Ends in a L-H Wave.
Square Chain The Top [C1] (Al Appleton 1972):
 From Facing Couples (or a R-H Wave).  
  Right Pull By and 1/4 In; Left Spin The Top; Left Turn Thru. 
  Ends in Back-to-Back Couples.
Grand Square Chain Thru [C4]:
 From Eight Chain Thru (or Parallel R-H Waves).  
  Right Pull By and 1/4 In; Grand Left Swing Thru; Left Turn Thru. 
  Ends in Back-to-Back Lines.
 See also Split [Square Thru] CONCEPT [C1] 
 and anything To A Wave CONCEPT [C1].