The use of an unusual jump to show a void in a side suit has found a place in many of the modern systems. Some methods make no initial distinction between voids and singletons.
It is possible to show a void in responding to a Blackwood enquiry of 4NT by making the normal response one level higher than usual, for example a 6♦ response showing one ace and a working void. Another method involves specifying which void you hold, by jumping to the suit below the trump suit with a low-ranking void and six of the trump suit with a high- ranking void.
