anything Chain Thru is the same as Finish Diamond Chain Thru EN: 20

The Cast Off 3/4 can be either an Arm Turn or a 'Push' Cast. EN: 30

If the anything call is a Triangle or Diamond Circulate, the word 'Circulate' is conventionally omitted. E.g., EN: 40

Some callers use Chain Thru from formations such as Parallel Lines and want all the Centers to Trade; and all to Cast Off 3/4. We believe this is an invalid usage of Chain Thru since it can be ambiguous in several situations. For example, from a Tidal Wave, does the caller want the Very Centers to Trade & then the Center 4 to Cast Off 3/4, or does the caller want each side to do a Centers Trade & all Cast Off 3/4? Also, if Chain Thru is allowed to mean each side Centers Trade followed by all Cast Off 3/4, then from Twin Diamonds a Chain Thru could be interpreted as Centers of each Diamond Trade (since they are Centers of their 4-dancer formation), followed by confusion, since there is no adjacent dancer within their 4-dancer formation with whom to Cast Off 3/4. EN: 50