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comment Am I allowed to take a red 5 after reaching?
This is not quite correct. Your hunch that it would not be allowed is correct. Once you declare riichi, all your draws must either complete your hand or be discarded. It is customary to keep your draws distinct from your hand for this reason (such as placing the drawn tile sideways on top of your hand). As for the concealed kan, you can only declare the kan if it does not change your waits. In the 111 222 333 example, you could declare the kan if the rest of your hand were 78 EE, but not if it were 45 EE. See the chombo rules here
comment Information gain from discarded tiles in Mahjong
This is true. In other variants of mahjong, "defense" is much harder. You have to pay a lot of extra attention and memory in order to keep track of what opponents are doing.
comment 4-4 high approach - why is the defensive approach prefered?
What if the position is changed to match the question's position, with the 6-4 black stone on 6-3 instead?
comment Does it really matter if dice are randomized?
Is there any documentation at all for these techniques? Maybe something like a video, or someone doing a "magic trick" or something like that? I'm not sure I can visualize how this would turn out. I find it somewhat difficult to believe that someone could roll a die so that there's a higher chance that half of it would show up without it appearing super obvious that they're doing so.
comment Go, MahJong, and Chess. Together?
I've actually played quite a bit of gomoku, and it is far from simple. I also play many forms of Chess, including Shogi and Xiangqi. Also, Chess technically has "asian" origins, as it is believed that all variants of chess stem from the Indian game Chataranga. Thanks for the help and suggestions, though!