In Katro have a basic rule : the piece that you place is choose by your opponent! In other word, you can only win by abstraction of your opponent or whether you build a configuration that reduce him choose.
Katro is a subtle game, it's please particularly to young player. The board become quickly limited and confused. Consequently, the players forget some types of pieces; one player of tow can exploit this to win.
Without the fact of careless mistake, this game put an interesting problem : how force your opponent to give you the victorious piece. And above all, when the trap is ready?
In fact, at the beginning, players choose and place random pieces. But quickly, one player limit the choose by drawing an align of 3 pieces with common type. The player done a bet, because he don't known who take adventage of align.
So strange, but Katro have interrest whit only collaboration between players. If a player close systematically align of 3 pieces, the game will be often null.