can someone tell me the name of this manga?

it's about mahjong (or something like that) & the main character is a girl. there's a amor triângulo in this manga, but no yaoi/ yuri. the 3 main characters enter a mahjong(?) tournament & that's as far as i got. i think the mangá starts with an "s," but i can't remember 2 clearly. plz help me & thx :)