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$_ = join '', @b;

...
$s+=$_ for/\d+/g;

print "$_: $s\n";

print score(join'',qw(5 / 6 3 X X 7 0 4 3 X 4 / 8 1 3 / 6)),"->146\n";
print score(join'',qw(X X X X X X X X X X X X)), "->300\n";
...
($_,$s)=@_;1while s#(.)/(.)#$1.($1<1?'x':10-$1)."\L$2y".$2#e||s#X(\d\d
+)#x$1$1#||s#X(..)#"x\L$1z".$1#e||s#(y.|z..)$##||s#x#55#;$s+=$_ for/\d
+/g;$s
#####
}