Mean Sumurai

Mean Sumurai is a unique maths game for sharp minds. You are given a number X, a sequence of digits. And your task is to split the sequence to get numbers that add up to X. For instance, with X = 81 and a sequence 15723, a winning splitting is 1 57 23 = 81. Are you a number samurai? Are you sharp enough to beat this game and its variants. Noise digits to leave out.