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msjennifer, on 2017-October-24, 03:58, said:
Before playing any card to the first trick there are only 10 tricks.They become 11 only As and when the declarer plays the HQ and the Jack appears. The plan thought of with 10 tricks originally changes and before that the count needs to be rectified.It can happen ONLY if opponents take the club Acs on the second round of clubs.Declarer does not KNOW that the HJ will fall on the first round of hearts and has to plan accordingly.
One of the conditions of the problem is that the opponents take the 2nd round of clubs and play back a club. It still isn't clear who had what clubs since the OP specified 2 ♣10 were played. The question of what to do if the opponents duck 2 rounds of clubs is an entirely different problem.
It looks like LHO is a clever player who is leading away from ♣A when RHO doesn't play the ace at trick 1, so I would win the queen, not the jack as specified by the OP, cross to a diamond, and lead a club to the king. Winning the jack at trick 1 and then continuing clubs from hand makes it clear that declarer has at least KQJ so a clever defender who knows something about squeeze play will find it easier to duck. If you cross to ♦K and lead a club to the king there's a better chance that LHO will play the ace.