The specification for Round 4 is:

Coresize	8000
Max processes	8000
Duration	80000 cycles
Max entry length	100
Min distance between warriors	100
Rounds fought	200
Instruction set	Redcode '94 Draft
Battle method	One-on-one all fights all (without self fights)
Scoring method	Win: 3 points Tie: 1 point Loss: 0 points

The idea of this round is to design a p-switcher, using the following components:

[Carbonite]

dbomb	dat	>-1, >1
	spl	#0, <-100
	mov	dbomb, tar-197*3500
tar	add	#197, -1		; gets bombed to start coreclear
	djn.f	-2, <-1151

[Mini He Scans Alone]

step EQU 9
ptr EQU (bomb-5)

bomb: spl    #1,{1
kill: mov    bomb,<ptr
mptr: mov    >ptr,>ptr
      jmn.f  kill,>ptr
a:    add    #step+1,@mptr
scan: jmz.f  a,<ptr
      slt    @mptr,#btm-ptr+3
      djn    kill,@mptr
      djn    a,#16
btm:  jmp    a,{kill

[Timescape (1.0)]

TSTEP equ 1800
CSTEP equ 3740
NSTEP equ -1922
FSTEP equ 1870

        spl     1,              <-200
        spl     1,              <-300
        mov.i   -1,             0

tim1    spl     @tim1,          }TSTEP
        mov.i   }tim1,          >tim1
cel1    spl     @cel1,          }CSTEP
        mov.i   }cel1,          >cel1
        mov.i   {-FSTEP,        <FSTEP
        mov.i   {cel1,          <ncl1
ncl1    jmp     @ncl1,          >NSTEP

The deadline for entries was Fri 27 Feb 1998 23:59:59 GMT.

Name	Author	Points	Score
Psst 2.0	Robert Macrae	4182	100.0
The Optimist	David Moore	4175	99.8
Triac	Planar	4089	97.8
rmt 4 pk	Paul Kline	3906	93.4
Simple things do well	Beppe Bezzi	3835	91.7
psych	John K Wilkinson	3821	91.4
Wizard 1.2	Compudemon	3792	90.7
Maybe	Ilmari Karonen	3776	90.3
LightSwitch v6	Ryan Coleman	3574	85.5
Struma & Maritza	John Metcalf	3215	76.9
Randomizer	Robert Hale	3114	74.5
Ghost in the core	Edgar	3081	73.7
Batz Maru	John K Lewis	2331	55.7
Circle of Life	Wolfwings	1844	44.1
(no entry)	George Eadon	0	0.0
(no entry)	Björn Günzel	0	0.0

Name	Score
Robert Macrae	378.3
David Moore	371.9
John K Wilkinson	367.3
Paul Kline	361.6
Beppe Bezzi	361.2
Ryan Coleman	320.4
Planar	306.0
Edgar	287.2
Ilmari Karonen	276.6
Robert Hale	275.8
John K Lewis	260.2
Björn Günzel	179.5
Compudemon	140.3
George Eadon	139.3
John Metcalf	76.9
Wolfwings	44.1