Your question's answer is written in Go rules : Since the black player starts the game, he has a significant advantage. In order to balance it, a value called komi is subtracted from the black player score. It is 5.5 for a 19x19 board, 4.5 for a 13x13 board and 3.5 for a 9x9 board.
(do skréše) Chce se tě zrovna valet rechlé špil, keré zaročeně skonči v pruběho dvó hodin? Vetvoř nabidko ke špilo a zadé tam Čas na špil: 0 dni 1 hodina, Extrovnica: 0 dni 0 hodin, Limit: 0 dni 1 hodina. (TeamBundy) (okázat šecke vechetávke)