All Pass Partner leads a high club spot, dummy plays low, and I win the Q . We have a rule that if I win a trick cheaply and then switch, I'm not switching to a singleton. I'm not sure this applies here, but I cash a second club and shift to a heart. Declarer covers and partner wins. Obviously, partner wants a club overruff, despite the heart returned, so I do that.
Partner ruffs higher than dummy, but declarer is down to all trump and claims shortly.
Upon reflection, I erred. From the lead, declarer is marked with three clubs. If he has eight spades, then he has only two red cards. If declarer is 1-1 in the red suits, it's imperative that I don't ruin our club ruff. I played too fast.