A word of caution: in order to understand the differences between the various rule sets one needs to be familiar with the strategy of playing for pools.
Realms close their borders automatically and their area is always minimized. A game in progress can be prematurely terminated only if one side resigns. These rules apply to games against the computer (dot engine at zagram.org) as well as to those that the guest players - those whose screen name is preceded with a star symbol – initiate.
Consequently, this makes the strategy of playing for pools difficult, as the pools consisting of more than 2 squares are now usually worth just the equivalent of one dot. Indeed, such pools are closed down automatically after the opponent has placed his dot in them. Nevertheless, occasionally one can salvage a part of a pool thereby slightly increasing its total worth.
Realms DO NOT CLOSE THEIR BORDERS AUTOMATICALLY and need not have the minimal area. These rules are almost identical to those at www.szkrab.net.pl (there are, however, three subtle differences, which are explained in 2, 3 and 4 below).
Consequently, these rules are tailor-made for everybody wishing to apply the strategy of playing for pools. However, given the same size of the board, the time required to complete a game of dots under these rules is usually slightly longer than when the game is played under the ''No Territory'' rules (see below).
Realms close their borders automatically and their area is always minimized. A game in progress can be prematurely terminated when one side presses the STOP button (see, however, the remarks below).
Consequently, this renders the strategy of playing for pools useless, since players are under no obligation to place their dots in the pools, even if there is no more room available elsewhere on the board. Following these rules might lead to relatively short duration of games as it might often suffice for one side to capture enough of the opponent's dots to ensure victory and head towards the edge of the board. Nevertheless, this set of rules bears the closest resemblance to those observed on most Russian websites featuring Dots (Kropki).