Article 1644 of rec.games.corewar:
Newsgroups: rec.games.corewar
From: ivner@lysator.liu.se (Anders Ivner)
Subject: Re: Nothing new yet
In-Reply-To: gt7804b@prism.gatech.EDU's message of 20 Feb 93 07:14:36 GMT
Message-ID: <IVNER.93Feb20201220@robert.lysator.liu.se>
Sender: news@lysator.liu.se
Organization: Lysator Computer Society, Link|ping University, Sweden
References: <85740@hydra.gatech.EDU>
Date: Sat, 20 Feb 1993 19:12:20 GMT
Lines: 86

In article <85740@hydra.gatech.EDU> gt7804b@prism.gatech.EDU (Wayne Edward Sheppard) writes:

   I still have a post from P.Kline oabout Scanner eradication from last
   September.  Things sure have changed since then.  I remember when Dan
   Nabwhatever posted his new 'Empire' program, which scored 195 with
   only 1% losses.  That shook the hill.

I think you've confused the facts a bit here...
Dan Nabutovsky's program was called 'Impossible', and was in fact an
improved version of 'Impire' which had conquered the hill one week earlier.

   I would like to encourage everyone to post their code.  Maybe someone
   can improve it.  Maybe someone can be inspired by it.  Maybe it will
   help new people get into the game, which might spawn new ideas.

Ok, so here goes: first an idea I've been having for awhile, but not quite
managed to implement.

loop  add  const, scan
scan  mov  <a,    <b
      jmz  loop,  <scan

This should work as both an emerald-like bomber and a cmp-scanner, since
something would be found if:
1) the b-fields of both b and b-1 is non-zero.
or
2) the b-field of the effective address of "<a" is non-zero, which would
indicate that "a", too, is worth bombing.

The drawback of this technique is, ofcource, it's tendency to suicide.

Now for a more sucessful attempt of mine: Herem II, possibly the most
effective bomber on the hill nowadays(?) (somewhere around 15-20th place :-)
I've submitted it to the first rounds in the valentine tournament,
desperately hoping to meet a scanner...

When emerald-type stones in fact only bomb the core at 67% of c (not
counting the djn-stream), Herem achieves 75% of c, and that including
_two_ non-decrement bombs (one spl 0 and one dat 0).

;redcode
;name Herem II
;author Anders Ivner

step	equ	2376

boot	mov	<spt,		<dpt
	mov	<spt,		<dpt
	mov	<spt,		<dpt
	mov	<spt,		<dpt
	mov	<spt,		<dpt
	mov	<spt,		<dpt

	mov	const,		const+4008
	mov	glue,		glue+4012
	mov	gate,		gate+4016

spt	jmp	@dpt,		const
dpt	dat		#const+4000


start	add	const+8,	pt
	mov	glue+12,	@pt
pt	mov	<4003,		@1
	djn	start,		<-100
	mov	gate+16,	<-10
	jmp	-2

const	dat	#step,  	#step
glue	spl	0,		<-20
gate	dat	<-22,		<-21

	dat		#1
	dat		#1
 [ Huge decoy removed to save bandwidth ]
	end	boot


   -- 
   Wayne Edward Sheppard
   Georgia Institute of Technology, Atlanta Georgia, 30332
   uucp:	  ...!{decvax,hplabs,ncar,purdue,rutgers}!gatech!prism!gt7804b
   Internet: gt7804b@prism.gatech.edu

Anders Ivner
d91andiv@und.ida.liu.se