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Rubinstein could not raise the money to play for the title Nimzovich could not raise the money to play for the title Keres was not allowed to play for the title as he had collaborated with Germany dur…

#1 There is no best opening. "All main openings are sound" - Kasparov Just pick one and stick to it. General recommendation is to defend 1 e4 e5 and 1 d4 d5 as black and to open 1 e4 as white.

There are no FIDE rules on coaching. You can coach if your rating is 1300 if you find a student. Lichess only endorses coaches on the coaches page if they have a title as a testimony that they are qua…

#30 #31 I stand corrected. Indeed Caro played 4...Nf6 e.g. against Berthold Lasker along 4...Bf5. Nimzovich invented the 5...gxf6.

#3 No, get a title first. Lichess endorsed coaches only if they have a title.

#23 No, in classical tournaments there is information on time per move used, information on the computer, information on other games. In classical it is easier to cheat and harder to detect than in ra…

#15 NM is no FIDE title

#1 You can coach if you find a student willing to accept your coaching, but you cannot advertise your coaching on lichess as lichess requires some title as a proof of you being qualified to coach.

In a correspondence game where players analyse intensively for 3 days they come up with moves of engine quality. It is impossible to tell if they consulted an engine or not. That is why ICCF now allow…

#18 I thought Vinogradov had proven the weak Goldbach independently. I only thought it interesting to mention the link between the apparently unrelated Goldbach Conjecture and the Riemann hypothesis.