1RB1LE_1LC0RA_0RF0LD_1LE1LA_1RC0LB_---1RC

1RB1LE_1LC0RA_0RF0LD_1LE1LA_1RC0LB_---1RC (bbch) is really interesting. Wiki user N1vi highly doubts that it halts, but it creates pseudorandom spaces at the right. He also ran it for ~860 million steps and the result is shown in the image. The machine may be a fractal.