13 Amsterdam pounds (1 Amsterdam pound = 494.09 grams). 
How Much Theory In dutch Defence?
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May 8, 2017
0
#4
Not much, cause blacks structure is the same or similar in almost all lines
I played the Stonewall Dutch for about a year with absolutely no theory. I just did the normal set-up, then played Ne4, usually g5 and then attacked the King. Worked a surprising amount of the time. The Leningrad is more unforgiving in terms of theory I believe, though if your opponent doesn't know the mainlines then you have no worries. The Classical is about average.
I found the hardest part about the Dutch wasn't the mainlines but the aggressive sidelines. Things like 2.Bg5 or 2.e4 or 2.g4 or 2.h3 and then 3.g4. They may not be sound, I don't know, but a single mistake gives Black a huge problem, and the games are decidedly different than mainline Stonewall, for instance. Very common in blitz, and not knowing at least the general ideas will give you a lot of losses.
May 9, 2017
0
#6
It took me two good years to prepare the leningrad with Black and get the real feeling of it. I read Kinderman's book which is still the best book. I guess the stonewall can be learned in less time. The question you should ask yourself is "Is the Dutch defense good for me? Does it fit with my way of playing?". The Dutch is for players that like to be enterprising with Black, like to risk, do not mind have their king exposed at times and seek the iniative at any cost. It does generate quite a lot of decisive results. If you like to play solid stay away from it.
The black structure is not the same in all lines at all, and neither are the plans. Flank openings like the Dutch and the Sicilian require a lot of knowledge of theory, and if you're playing a good player it's likely he's aware of a sideline in the Dutch and if you don't know the moves for the line you're kinda just screwed
Thinking of starting it. I like theory but just want to know how much is necessary.