Grendel's Revenge is a clear-directing scanner which entered KOTH.org's 94nop hill on 8th January 2016 where it survived 195 challenges before being pushed off on 30th July 2018.

;redcode-94nop
;name Grendel's Revenge
;author S.Fernandes
;strategy q^4scan -> scanner

;assert CORESIZE == 8000

        org     qscan

warr    equ     shades

step    equ     4970
offset  equ     step
sep     equ     5
count   equ     660

target  mov.b   shades      ,    #speedup
wipe    mov     bomb        ,    >target
loop    add     inc         ,    shades
shades  seq     }offset+sep ,    offset
        djn.f   target      ,    @target
speedup djn     loop        ,    #count
inc     spl     #step       ,    step
clear   mov     cleanup     ,    >clear-3
        djn.f   clear       ,    >clear-3
cleanup dat     <2667       ,    7

        for     4
        dat     0           ,    0
        rof

bomb    spl     #0          ,    <4001

        for     55
        dat     0           ,    0
        rof

        qfac   equ 3361
        qdec   equ -1758

        qa     equ (qfac*(qtab0-1-qptr)+1)
        qb     equ (qfac*(qtab0-qptr)+1)
        qc     equ (qfac*(qtab1-1-qptr)+1)
        qd     equ (qfac*(qtab1-qptr)+1)
        qe     equ (qfac*(qtab1+1-qptr)+1)
        qf     equ (qfac*(qtab2-qptr)+1)

        qtime  equ 18
        qstep  equ -7
        qgap   equ 87

qdecode mul.b  *q1,          qptr
q0      sne    <qtab0,       @qptr
q1      add.b  qtab1,        qptr
q2      mov    qtab2,        @qptr
qptr    mov    qtab2,        *qdec
        add    #qstep,       qptr
        djn    q2,           #qtime
        jmp    warr,         qc
qtab1   dat    4000,         qd
        dat    4000,         qe

qscan   sne    qptr+qdec*qe, qptr+qdec*qe+qe
        seq    <qtab1+1,     qptr+qdec*(qe-1)+qe-1
        jmp    qdecode,      }q1
        sne    qptr+qdec*qb, qptr+qdec*qb+qd
        seq    <qtab0,       qptr+qdec*(qb-1)+qd
        jmp    qdecode,      {qdecode
        sne    qptr+qdec*qa, qptr+qdec*qa+qd
        seq    <qtab0-1,     qptr+qdec*(qa-1)+qd
        djn.a  qdecode,      {qdecode
        sne    qptr+qdec*qf, qptr+qdec*qf+qd
        seq    <qtab2,       qptr+qdec*(qf-1)+qd
        jmp    qdecode,      }qdecode
        sne    qptr+qdec*qc, qptr+qdec*qc+qc
        seq    <qtab1-1,     qptr+qdec*(qc-1)+qc-1
        jmp    qdecode,      {q1
        sne    qptr+qdec*qd, qptr+qdec*qd+qd
        seq    <qtab1,       qptr+qdec*(qd-1)+qd-1
        jmp    qdecode,      qa
qtab0   jmp    warr,         qb
qtab2   dat    qgap,         qf
        end