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[crazy voyager]

Originally Posted by eg-italy

Well, the horn is official (although in Italy they use whistles also at the table ). It's the beckoning-in signal which turns a sub into a player, not the whistle.

Ciao

Yes the horn is the official scoreer signal but it does not turn the sub into a player, the whistle does.
4.2.3 A substitute becomes a player and a player becomes a substitute when:
• The official beckons the substitute to enter the playing court.
That's what I didn't agree with