Nemesis is a continuous hydra paired with a paper/imp which entered the KOTH.org 88 hill on 29th November 2020 and survived to age 30 before being pushed off on 16th September 2021.

;redcode
;name Nemesis
;author John Metcalf
;strategy qscan -> hydra/paper/imp
;assert CORESIZE==8000

; qscan - 36 scans in 48 instructions

        qfirst equ (qp2+2*qstep)
        qdist  equ qfirst+130
        qstep  equ 260

        qi     equ 7
        qr     equ 7

qbomb   dat <qi/2-qi*qr,   <qi*qr-qi/2

        qa  equ qstep*16
        qb  equ qstep*5+2
        qc  equ qstep*10
        qd  equ qstep*2
        qe  equ qstep*1

qscan   cmp qdist+qc,      qfirst+qc
        jmp qfast,         <qa
        cmp qdist+qe+qd,   qfirst+qe+qd
qp1     jmp <qfast,        <qc
qp2     cmp qdist,         qfirst
qp3     jmp qskip,         <qe

        cmp qdist+qb,      qfirst+qb
q1      djn qfast,         #qp1

        cmp qdist+qd+qc,   qfirst+qd+qc
        jmp qslow,         <qfirst+qd+qc+4
        cmp qdist+qd+qb,   qfirst+qd+qb
x1      jmp qslow,         <q1
        cmp qdist+qc+qc,   qfirst+qc+qc
q2      djn qslow,         #qp2
        cmp qdist+qd,      qfirst+qd
        jmp qslow,         <qfast
        cmp qdist+qa,      qfirst+qa
        jmp q1,            <q1

        cmp qdist+qa+qd,   qfirst+qa+qd
        jmp x1,            <q1
        cmp qdist+qc+qb,   qfirst+qc+qb
        jmp q2,            <q1
        cmp qdist+qe+qd+qc,qfirst+qe+qd+qc
        jmp qslower,       <qfirst+qe+qd+qc+4
        cmp qdist+qe+qd+qb,qfirst+qe+qd+qb
        jmp qslower,       <q1
        cmp qdist+qe+qc+qc,qfirst+qe+qc+qc
        jmp qslower,       <q2
        cmp qdist+qd+qd+qc,qfirst+qd+qd+qc
q3      djn qslower,       #qp3
        cmp qdist+qe+qc,   qfirst+qe+qc
        jmp <qfast,        <q2
        cmp qdist+qd+qd,   qfirst+qd+qd
        jmp <qfast,        <q3
        cmp qdist+qd+qd+qb,qfirst+qd+qd+qb
        slt <q3,           <q1

        jmz warr,          qdist+qe+qd+qc+10

qslower add @q3,           @qslow
qslow   add @q2,           qkil
qfast   add @q1,           @qslow

qskip   cmp <qdist+qstep+50, @qkil
        jmp qloop,         <1234

        add #qdist-qfirst, qkil
qloop   mov qbomb,         @qkil
qkil    mov <qfirst+qstep+50, <qfirst
        sub #qi,           @qloop
        djn qloop,         #qr+2

warr    spl 1,             <1000
        spl 1,             <3000
        spl 1,             <5000
        mov <tdjn+2,       <hboot
        mov <tdjn+2,       <pboot
hboot   spl @0,            warr+5452
pboot   jmp @0,            warr+6608

; paper with vortex launch based on Evil Spirit

        istep  equ 1143
        pstepa equ 6502
        pstepb equ 1708
        size   equ 8

        mov <size,         <papa
papa    spl @0,            pstepa
        mov <size,         <papb
papb    spl @0,            pstepb
        spl 0
        add #istep,        launch
launch  jmp @0,            imp-istep*size
imp     mov 0,             istep

; continuous hydra based on Hordes of Microwarriors

        first  equ 7068
        step   equ 1808

tspl    spl 0,             <boot
        mov 0,             <boot
boot    mov tdjn,          first
        add #step,         boot
        mov tspl,          @boot
        djn @boot,         <-100
tdjn    djn -2,            #4014

        end qscan