It isn't absolutely necessary to 'nominate' when playing your free ball. You need to nominate to the referee's satisfaction. 'Nominate' can mean playing in the direction of the ball and it's obvious you are not going for any other ball. But, as always, if it isn't clear which ball you are going for (you may be playing into the direction of more than one ball) then you should verbally declare or just point at it clearly (if you can't speak for example). People think you must nominate on a free ball but you don't, if it is really obvious then there is no need to take things to the extreme. In the Free Ball rule (or 'Snookered After a Foul' as the rules calls it) it talks about 'Nominated Ball' and 'striker nominates', but here is the actual definition of 'Nominated Ball' from the rules:
Having said that, it is always best to say which ball you are going for on a free ball to be on the safe side just in case your opponent or referee thinks you MUST nominate.
12. Nominated Ball
(a) A nominated ball is the object ball which the striker declares, or indicates to the satisfaction of the referee, he undertakes to hit with the first impact of the cue-ball.
(b) If requested by the referee, the striker must declare which ball he is on.
(a) A nominated ball is the object ball which the striker declares, or indicates to the satisfaction of the referee, he undertakes to hit with the first impact of the cue-ball.
(b) If requested by the referee, the striker must declare which ball he is on.
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