When it is necessary for a player to choose between chains for some action, the Chain Selection Popup Window will be displayed. This occurs when:
Chains are formed
A merger occurs and the merged chains are of equal length (necessitating the player to choose the survivor)
A merger occurs and there is more than one merging chain of equal-length (necessitating the player to choose the next chain to dispose of).
When displayed, this Dialog Box shows the available chain names to be chosen from with a radio button beside each one. Chains that cannot be chosen appear but are disabled (shaded).
To select the chain for the desired action, click the desired chain and press the Ok button.