Kansspelbelasting in Nederland, hoe en wat

Hey, 

I am sorry for writing it in English but right now I am not able to speak Dutch. 

I have a very important question because I want to move to Amsterdam next year and I want to know how to tax my sportsbetting winnings. 

In Germany we have to pay 5% on every bet we place but I heard that in the Netherlands you have to pay 29% on your winnings and you can also claim your losses so you only pay the difference? 

Thanks for your help :)