1RB2RB1LA_2LC0LB2LB_2RC2RA0LC

1RB2RB1LA_2LC0LB2LB_2RC2RA0LC (bbch) is the current BLB(3,3) champion blanking the tape after $10^{42745}$ steps

Analysis

A(x,y)=2 C> 2^x 0 1^y

A(x,y) -> A(2x+5,y-3) if y>2
A(x,0) -> blank
A(x,1) -> A(8,2x+1)
A(x,2) -> blank

A(8,4) -> A(21,1) -> A(8,43) -> A(21,40) -> A(47,37) -> A(99,34) -> A(203,31) -> A(411,28) -> A(827,25) -> A(1659,22) -> A(3323,19) -> A(6651,16) -> A(13307,13) -> A(26619,10) -> A(53243,7) -> A(106491,4) -> A(212987,1) -> A(8,425975) -> ... -> A(13*2^141991-5,2) -> blank