89.103.185.10: Go software for studying/reviewing sgf games (2014-12-29 20:28) [#10357]

(Crossposted at http://boardgames.stackexchange.com/q/21296/1845, it's probably better if you answer there)

I got a great review of my game ( http://files.gokgs.com/games/2014/12/28/tomast-2.sgf from another player on GoKGS. So I got this *.sgf file with lots of variants (tree branches) with lots of comments... So now I am looking for a good piece of software that would:

1. Allow me to browse through all the variants and not get lost (it would be great if it could distinguish the variants I've already seen or something, otherwise I can get lost easily...)

2. There were certain situations (like in move 51) where the reviewer told me "this is the key point to kill the opponents group". I would like to experiment with this. It would be nice if the software could tell me if the group is alive or dead - i.e. some help in the analysis, since I am (as a beginner) not always able to find the optimal move for either side... (I've heard of GoTools, but 1) I've also heard that they have lots of bugs, besides of being closed & paid only and 2) I don't know how they comply with requirement 1).

Thanks in advance!

Tomas