Hi all. Kinma suggested that I reply to this topic.
Firstly, I am the one who recorded that video of Granth doing the 20x20 correctly, in Germany. Later, I put those videos my “MentalCalculation1” channel in Youtube, just for the Dresden MCWC 2014 World Cup. I don’t think I’ll put many videos there soon, since I’m doing some kind of rebranding. Anyway, I recorded that particular video of Granth, on 12 Oct. 2014, in the “Holidays Inn” Hotel in Dresden, Germany. I was recording Granth during his official trial and I witnessed him solving correctly the whole 20x20 multiplication thing in less than 3 minutes. Yusnier Viera, Silke Betten, Jan Van Koningsveld, Melik Duyar and Scott Flansburg, were also present in the room in this official trial. (along with Rhea Shah who broke the 10-digit Roots record). Scott Flansburg was so ecstatic about Granth, that he told us “If I am the Human Calculator, then Granth is the Machine Calculator himself” !!. But unfortunately, neither Granth nor Rhea competed in 2016. That’s was a shame because I was really interested to see how the Top Indians would fare against the Top Japanese and Mrs. Lee from S.Korea. The Indians in 2016, besides Calendars, did not really win many golds, because of these 2 extremely important absences of Granth and Rhea.
About the square root method, since I have been a Memoriad medalist on roots almost 5 years ago in 2012, I’d just like to mention that I quickly learned Rob Fountain’s, Jan V.K.'s, and Willem Bouman’s method, just after MCWC-2010 and in 1 year I saw and I was really efficient in it. I won’t mention the algorithm, here, because it’s already posted numerous times in the YAHOO’s MC group. Just search through the posts there from 2010 to 2012. And everyone does his own shortcuts, which are kind of a personal effort, like learning the 1000 squares or something. Talent is not enough. It needs willingness to train.
About Granth, Rhea and the Indians, they use the “Duplex Method” which is far more efficient than ours, but to each his own. Personally, I stopped training so much in square roots, because I had to devote my time to become better at Calendar calculation where I had many more chances to reach the Top. In roots, in competitions I just try to keep up with the level I am now. It’s hard to improve much more, at my level, unless I switch to the Duplex method, and I am not really into mood for that right now, because it’s a whole different thing and needs to re-tame another mental beast. And the World Records in both roots and calendars are now so high, where there is very little human room for substantial improvement.