I'm kinda new to draughts. Brazilian and Russian draughts seems 100% same. :/
Can anyone explain, how they're different.
Brazilian and Russian draughts are like sisters: historically, both of them evolved from Pool draughts (in English speaking world, more commonly referred to American Pool checkers) in order to enjoy more tactical opportunities. However, when it comes to pure positional play, the compatibility between Brazilian and Russian is very close: it is approximately 80%.
In any draughts variant the differences deal with some options.
The first option is about quantity of captured pieces. In some cultures the most common assumption is that a player should capture maximum number of pieces (and, in this regard, draughtsmen and kings are counted as one piece). It is "majority capturing" rule which is mandatory in Brazilian draughts: to be simple, if a player has options for capturing 1 or 2 pieces, a player is obliged to capture 2 pieces. Contrary to this assumption, in Russian draughts, a player has to make own choice, and a player is not obliged to subject to desires of his or her opponent in each case: this is a rationale why majority capturing rule is not mandatory in Russian draughts.
As I said above, that rule impacts tactical play, therefore some Brazilian tactics don't work in Russian draughts, and vice versa!
The second option is about crossing crowning line with simple draughtsman. In both Brazilian and Russian variants capturing backwards is mandatory. Brazilians and many other nations treat it simply: if a draughtsman can immediately take backwards after crossing crowning line, it remains a draughtsman. However, these players which are playing according to Russian rules, hold different opinion: if a crowning line is crossed, a draughtsman must be crowned into a king, and there is no reason to deprive that draughtsman from rights of king!
The third option is closely related to the second. In majority of draughts variants, including Brazilian, an act of crowning is treated as significant moment of the game, therefore, a draughtsman must stop on crowning square for obtaining rights of king, if it can't continue capturing with rights of simple draughtsman. This is not valid in case of Russian draughts, therefore native players would object: if a capturing sequence is initiated, it must not be stopped for crowning reasons, because crowning is not the most significant moment of the game! And, indeed, that idea is tactically justified: there are many positions where this difference allows to carry out marvellous shots.
Here below is a my study which illustrates basic tactical differences between Russian and Brazilian.
As well, let me state clearly that any differences in rules doesn't make some variant less playable or less enjoyable! Draughts is closely linked to culture; the differences of rules is a live evidence of traditional values or beliefs, and nowadays it is very rare to meet some good draughts player who had not played at least three variants.