Hi, and welcome to the forum from just another magic-maker. And do not apologize for your English. If we Americans could speak even a bit of another language, we'd be quite happy. Not sure why you see "mistakes" in the routine or are confused by it. The magicians evidently puts four kings on the table and shows four black spot cards in his hand. Then, one by one, the kings magically exchange themselves for the spot cards so he then has four kings in his hand. The spectator, thinking there are now four black spot cards on the table, is stunned to see they have turned into aces. And it looks like only an Elmsley count is used in the routine. Learn it and you can stun the crowd, too.