Finally, we can have a look at how a 6H slam might fare. Most average declarers would probably fail unless South leads the jack of clubs, a card some Souths might choose. Easy after that, dummy covers and declarer’s nine comes good. The lead of a doubleton jack is not a good lead against any contract unless you have a very good chance of finding partner with higher honours, which this time is nothing short of wishful thinking given the bidding. Here, it is disastrous, because declarer was looking at two possible club losers. A spade lead as it happens comes to no harm and neither does a diamond, but my choice would be the six of trumps. That is totally safe, even if partner has the queen or king. But what if partner has the singleton queen or king and you lead the jack? The low heart, as it happens, gives declarer an extra entry to dummy but it is not needed and declarer can proceed along sensible lines by winning in hand and immediately leading the nine of clubs to the queen. Unlucky! It loses to the king and now there would appear to be little chance of the slam making. But read on.
Board 3 Dealer South EW Vul