Tribal, you'll never know what is a good cross my friend, the best cross regardless of strain, is two inbreed pigeons of any 2 given strains. But a cross is good as it creates hybrid figure, but no pairing is going to guareentee you winners. So if youve got the right winning line of van reets and you obtain the right winning lines of lambrechts you could produce a good winning line of crosses. But all you can do is try, you can never predict a pairing that is going to breed you good birds, its luck that finds them