;redcode
;name Cowboy
;author Eugene P. Lilitko
;Union of Soviet Socialist Republics
;assert 1
;
;The snare for the opponent's processes.
;Bison commits suicide when all 64 processes are captured.
;
FIRE          DAT                  #  FIRE

BEG           DAT                  #  BEG
FENCE         MOV      SUCCESS  ,     SWITCH
DEMON         SUB   #  1        ,     BISON
HELP          SPL      DEMON
BOMBING       MOV      FIRE     ,  <  FIRE
              JMN      HELP     ,     BISON
              MOV      BOMB     ,     HELP
BOMB          DAT                  #  BOMB
BISON         DAT                  #  64
COUNT         JMP      FENCE

;Welcome to the snare!
;
WELLC1        JMP   <  WELLC1
WELLC2        JMP   @  WELLC2


;The main code.  Traps are set, inviting the opponent to jump
;into the snare.  When the bison are captured, SWITCH is changed
;to the instructions of SUCCESS.
;
START         MOV      REST     ,     SWITCH
GBOMB         MOV   #  575      ,     FIRECNT
              MOV   #  64       ,     BISON
              SPL      RADAR
CONT          MOV   #  4098     ,     WELLC1
              MOV   # -4099     ,     WELLC2
LOOP          MOV      WELLC1   ,  @  WELLC2
              MOV      WELLC2   ,  @  WELLC1
              ADD   #  7        ,     WELLC1
              SUB   #  7        ,     WELLC2
SWITCH        DJN      LOOP     ,     FIRECNT

;All right! There are bison in the snare.  The captured bison invite free
;bison into the trap.  Cowboy must help them!
;
NEW           MOV      BOMB     ,     FIRE
              MOV      BOMB     ,     KILL
SHOOT         MOV      FIRE     ,  <  FIRE
              JMZ      SHOOT    ,     KILL
FORWARD       JMP      NEW
SUCCESS       MOV      GBOMB    ,     SUCCESS
REST          DJN      SHOOT    ,     COPY+3

;The defense process.  Build a set of pickets, test for a breach of the
;pickets, and switch to defensive action when the pickets are breached.
;Defense occurs when Cowboy is copied to a new place in memory, and the
;copy begins operating properly.
;
RADAR         MOV   #  638      ,    FORWARD
              MOV   # -638      ,     BACK
              MOV   #  25       ,     COUNT
MAKE          MOV      COUNT    ,  <  FORWARD
              MOV      COUNT    ,  <  BACK
              DJN      MAKE     ,     COUNT
TEST          MOV   #  638      ,     FORWARD
              MOV   # -638      ,     BACK
              MOV   #  25       ,     COUNT
COMPARE       CMP   <  FORWARD  ,  <  BACK
BACK          JMP      ALARM
KILL          DJN      COMPARE  ,     COUNT
FIRECNT       JMP      TEST
ALARM         MOV      BOMB     ,     SWITCH
              MOV   #  50       ,     BEG
              MOV   #  3310     ,     FORWARD
COPY          MOV   @  BEG      ,  <  FORWARD
              DJN      COPY     ,     BEG
              MOV      NEW      ,     BOMBING
              ADD   #  11       ,     FORWARD

FINISH        JMP   @  FORWARD
              END      START