http://www.perlmonks.org?node_id=1069717


in reply to Re^3: Golf: Cabbage, Goat, Wolf
in thread Golf: Cabbage, Goat, Wolf

263 with some more micro-optimization (hey, that's what I do...):
sub t{sprintf('%04b',@_)=~y/01/ w/r& bcgw}sub p{printf"%s%8s$/",t(15-$ +_),t$_ for@_;print$/}sub r{my($h,$s,%s)=@_;($s^15||p@$h)|r([@$h,$_],$ +_,$_,1,%s)for grep!$s{$_}&!($s&8&&~$s&$_&7)&!(~$s&8&&$s&~$_&7)&&($z=$ +s^$_)&8&&(($z&=7)<3|$z==4),15,grep$_%3,1..14}r[0],0,0,1
Tricks: (1) grep with brackets usually costs an extra character; (2) barewords don't need quotes; (3) play with -- nay, mercilessly abuse! -- precedence; (4) spelling y/// as tr/// makes Baby Jesus cry.

I wonder if one of Ton's magic formulae could be applied? (See Golf: Magic Formula for Roman Numerals.)