Level 5 - Expert
The distinction between an amatuer and an expert is very fine. But the expert is able to read the game better than an amatuer and on top of that, control the development of the game too. To the untrained eyes, they would not be able to tell the difference, to the intermediate and amatuer players, some of their moves does not make sense at all.

Knowledge: Know thyself and know your enemy and the battle is won. An expert game is about knowledge and he makes full use of it with his best of his abilities

Skill: An expert is able to predict the tiles that you want based on your game. He is able to dictate the flow of the game when possible to make it favourable to him. For example, he will play a short 1 fold game to foil your grand plans for a 8 fold set. He will starve you and delay your progress or even let you win a 2-3 fold game on purpose to avoid a 6 fold calamity.

Playing Style: Revolves around his own tiles and his next player's tiles. An expert would at least be able to study his next player in details and devised strategies to control the flow of the game. They may start to adopt some strategies to hide their game intentions from other players like messing up their tiles etc.

Self assessment: - I have yet to master this level - But according to my in-house expert, experts may find themselves losing to beginners and novice simply because they can't predict what they are doing! When they do win, they can win it big against lesser players and few could stand playing against experts unless they are one too.

Reaching this level: - I have yet to master this level - But I guess one has to play against experts and masters to really be one. This got to be the evaluation of revised Bloom's