I opened THREE SPADES (I know, I have only six), partner raised me to FOUR SPADES.
Lead was the five of clubs. Plan play single dummy.
I played low, East contributing the King. East returned a club, and it went, nine, seven, ten. I now took TWO rounds of trump only, ending in dummy. I proceeded to cash CA, and CQ taking heart pitches. When it proved that the long trump was with the long clubs, this passed off with noone ruffing in. The lead was in dummy, and I advanced the HK, ruffed out the HA, and drew the last trump. It now seemed promising that the DA would be onside, and indeed when I played up a diamond, West took his Ace, and I was +650 for some almost 80%.