When this hand was played in a club game, the field was mainly in 4H. This is the correct place to play the contract but about one- third of the field failed to find the eight card heart fit and played in 3NT. Those who played 3NT from the North side were successful probably due to a spade lead. Those who played it from the South side failed as West has no problem finding the killing diamond lead. In the normal contract of 4H, there are two leads which can defeat declarer. A club lead will allow East to play both the queen and ace of clubs then a diamond back to West will allow the killing club ruff. However, nobody should lead anything other than a spade when partner has bid them. Notice that the 1S overcall is perfectly normal. The suit has sufficient intermediates to stop any danger from a bad break and penalty double and there are enough high cards even if though this is near the bottom of the range of an overcall. It is important to bid the spade suit if at all possible and partner will often draw inferences from the failure to bid spades when one might. the queen has no advantage with the king known to be with East. East also plays small and declarer wins the jack. Declarer follows the standard declarer plan of drawing trumps first with the third round being won by the king. The jack of clubs is now led and run to East’s queen. East knows exactly what the spade position is and needs to get West in to lead another one through the queen. The only hope is to lead the 8D ( to suggest not returning a diamond) and, fortunately, West can win with the ace. It is clear to West to return another spade. Even if it is unclear what is happening in spades themselves, the defenders clearly have no diamond tricks because of the lead of the 8D and declarer is playing clubs so the defence does not need to. Thus, even a defender who is only half awake should find the spade return setting up the defensive spade trick before the AC is knocked out.