Is Heroes 3 a sport, like chess? How does the planning differ?

I actually meant playing in person, not online. Online platforms have anti-computer assistance measures. The system scans each game for the use of computer assistance and detects it with high accuracy. I don't know how it does it, but it works, and the accuracy is almost 100%. There is no such protection available in person, even in serious tournaments.

How could someone use assistance in serious tournaments in person? An earpiece transmitter? And no one would notice?
I clearly remember reading about cases of lifetime disqualifications from chess for some unknown players who suddenly started winning left and right, even without clear evidence (and I suspect I read it on Heroes & Villains, or a link I saw here on Heroes & Villains).

I'm glad we've clarified the issue of online chess. In our game, there is currently no online control at all, while in chess, as you wrote, the probability of detection is almost 100%.
To clarify, password-protected saves from the early days proved that they are not a reliable form of protection – first, the disqualification of Dsquared, then the mysterious spectator of Helllight, who told him in advance what he would find on the map, where, and what would be in the utopia. In general, the first "something" that resembled a decent control was the control of text-based templates in HotA 1.5.2, and even then, the task was not set very well, so a good idea was implemented incorrectly. But at least it was the first attempt to actually control something. Before that, there were only illusions of solving the problem.
In chess, I was most impressed by the checkbox – "using computer assistance." I think that in Heroes, a similar checkbox – "playing with a maphack" could save us from some of the problems (except for the most severe cases of inflated ego, and in any case, at most in a "season," not in tournaments).