According to WPA rules,
In games in which the shooter is required to call shots, the intended ball and pocket must be indicated for each shot if they are not obvious.
However, I don't understand from this description if you are allowed to pocket some other legal ball, but not the called one, only strike the called ball.
Let's say the position is like this, with ball (1) sitting over a corner pocket X and the cueball (C) blocked by another legal ball (2), and let's say I have no other legal balls on the table (for example, only (8) left for me after these in an 8-ball game):
X \----------------
\(1) (2) (C)
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My options would be either to play a combination shot striking (2) and potting (1), or potting (1) by playing a kick shot off the rail not visible on this diagram.
If the game is call-shot, can I nominate ball (2) and pocket (X), yet still pot (1) with the combination shot outlined above?