 Results on branch-and-reduce algorithms  were to a large part achieved by developing new, more practical reduction rules.
<meaning-changed>  Results on branch-and-reduce algorithms  were to a large part achieved by developing new, more practical reduction rules.
 Results on branch-and-reduce algorithms , which combine branch-and-bound with reduction rules, achieved substantial results, solving many previously infeasible instances. These results were to a large part achieved by developing new, more practical reduction rules.