From Facing Couples (or a R-H Wave). 
EN: 10    Right Pull By & 1/4 In; Step To A L-H Wave; 
  (Left) Spin The Top; (Left) Turn Thru. 
EN: 20    Ends in Back-to-Back Couples. 
EN: 30   
 Alternative definition: Square Thru on the 2nd hand Spin The Top; (Left) Turn Thru. 
EN: 40   
Notes:
- 
 - 
 The end result of 
Square Chain The Top is the
    same as if you'd done a 
Reverse Swap Around. 
EN: 60    
Left Square Chain The Top [C1]: 
 Start with the Left hand (i.e., Left Pull By;
  1/4 In and Step To A Right-Hand Wave; Spin The Top; Turn Thru). 
EN: 70   
Split Square Chain The Top [C1] (Johnny Walter 1973):
  
Those who can Right Pull By and turn 1/4 to face the inactives; all Step
  To A L-H Wave; Spin The Top; Left Turn Thru.  Ends in Back-to-Back Couples. 
EN: 648 
Square Chain The Top To A Wave [C1]:
  
From Facing Couples (or a R-H Wave).  
  Square Chain The Top but replace the (Left) Turn Thru with a (Left) Arm Turn 1/2.  
  Ends in a L-H Wave. 
EN: 649 
Square Chain Thru [A1] (Buford Evans 1965):
  
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. 
EN: 72 
Square Chain Cross The Top [C4]:
  
From Facing Couples (or a R-H Wave).  
  Right Pull By & 1/4 In; Step To A L-H Wave; 
  (Left) Spin The Top & Spread; Turn Thru. 
  Ends in Back-to-Back Couples. 
EN: 650 
 See also  
Split [Square Thru] CONCEPT [C1]
 and anything To A Wave CONCEPT [C1].