Charon v8.1 is a stun bombing scanner which entered the Intel 88 hill in January 1993 and survived 629 challenges before being pushed off in March.
;redcode ;name Charon v8.1 ;author Cisek,Strack,Kline ;strategy creation date 4/22/92 ;strategy v2.0 4/22/92 total code overhaul ;strategy mod 3 cmp scan with optimal step, new deadly trap (SPL 0, JMP -1) ;strategy v3.0 5/3/92 integrated with Stefan Strack's Echo (much smaller) ;strategy v4.0 5/8/92 [pretty much a failure] ;strategy v5.0 5/12/92 same as 3.0, new clear core routine ;strategy v6.0 6/11/92 finally moved off axis (v5.0 was getting slaughtered ;strategy by programs copied across the axis) ;strategy v7.0 7/6/92 2 instructions smaller, different constants, ;strategy linear decrement triggers clear core. ;strategy [no longer hits itself to start clear core] ;strategy v8.0 12/22/92 now forward-scans for an extended time ;strategy using step-size that kills slow-moving imps ;strategy also protecting 3 lines against decrement ;strategy v8.1 1/25/93 new step-constants ;strategy Charon is the >original< spl/jmp bombing cmp scanner. ;strategy It scans using an off-axis CMP-scan, bombs with the spl/jmp ;strategy combination (thus slowing the enemy down), and eventually ;strategy clears the core with dats. STEP equ 68 ;scan constants: DIST equ 34 ;small, so can be reused in core clear DJNOFF equ decr-DIST FIRST equ DJNOFF+149 ;optimal offset to DJN train attack add switch,@compptr ;switch A- and B-fields mov jump,@comp compptr mov split,<comp scan add incr,@compptr comp cmp FIRST-DIST,FIRST ;start executing here slt #incr-attack+DIST+1,@compptr ;don't hit self decr djn scan,<DJNOFF ;countdown to clear jmz attack,0 ;enter clear when this is decremented split spl 0,<2667 ;clear core switch mov @0-DIST,<1-DIST jump jmp -1,<2667 incr dat #STEP,#STEP end comp