Czech and Slovak rules

[portnov]

portnov/qcheckers#6

http://damki.net/pravila-shashek/3416-pravila-igry-v-cheshskie-shashki.html

Slovak variant:

Although Czech draughts is itself a regional variant of the draughts game, the version played in the Slovak Republic is slightly different in that each player begins with only two ranks of men, and that the huffing rule is enforced: if a piece that must capture does not do so, the opponent may, at his option, take it before his own move. Furthermore, if a player has no legal moves, but does have men on the board, the game is a draw. This variant is played only in Slovakia (Slovak Republic) and probably by the children.