Pro players use HoMM3 HD Mod + HotA addon, which are closed source improvements of the original binaries with solid support for multiplayer action. It has lobby with ladder ratings, simultaneous turns, etc.
The lack of expansions is the real killer imo, so many “basic” things were actually added in expansions.
Features added in expansions:
* Conflux
* Can choose to buy unupgraded creatures from an upgraded dwelling
* Can garrison mines
* New Heros
* Combination Artifacts
* Random Map generator
* Magical terrains
The Random Map generator is the biggest one, likely.
For people who only played HoMM3 20 years ago, Duel type maps may be a pleasant surprise with their lack of micromanagement.
If that sounds a lot like chess, its because it kind of is :)
nvm. found it: https://hilo90mhz.com/homm3/