Risk,is the game mixed of skill and luck.But skill is a more important factor that make you win the game.In my view of the percentage of importance,skill have 70% and luck only have 30%.To owning the great skill,you must learn about calculation.Let me talk about my view.I think the players should consider these things before making a move:
1.How to place/fortify your troops?
--- At the first turn,you'd better concentrate all your troops in the strategic point(Such like the place that connect many continents,it will help you easily take a continent without engage with your opponent)
--- Just remember:Concentratiing troops is always powerful than divided troops
--- Before placing/fortifing troops,you should consider about your strategic plan(eg.where should be lightly or heavily garrisoned?Where is the strategic point?Expand to where?Which player is/are your true threat?)
2.How to launch the offensive?
--- What is your purpose of the attack?(Gaining terrtories?Weakening opponent?Conquering player?)
--- Which attack route is the best?(Thus prevent over-expansion)
--- Do you have sufficient troops to process it?
--- Will the other opponent take advantage of your attack?
--- How to fortify after the attack?
3.Are you able to conquer player in your turn?(It is a fatal blow if you ignore it,because the other player will probably take the opportunity of conquering player)
4.When should you make the bold move?
My answer is when the opponent become very strong and no one can contain his power,you should launch the bold strike to him when you have enough troops.But alliance(though almost impossible in Risk game website) is the best way to weaken him.
In conclusion,Much calculation is the key of the victory.To learn more how to play in Risk game,you may watch the landgrab.com No,1 player Rydawpark,maybe you can learn a lot from him.