Beginners Luck

The belief that a person playing for the first time will be lucky. Some people think that a novice players do not feel the pressure of the game, this is why they win more easily than the experts. Others think that this belief in beginner's lick is based on the confirmation bias: winnings are usually well remembered, while losses tend to be forgotten. The game experts might believe in the beginner's luck because they have experienced some good winnings when they just started playing. Those people who were less fortunate at the beginning have probably lost their interest in the casino games.

Beginner's luck tends to expire pretty quickly once the player gets more experience with the game. They say, it is only a gift of support that is given once to a beginner of a new experience. 

Synonym: Honeymoon Period