The bidding was a bit of a blunt instrument, but I couldn't see how to explore more scientifically
We were playing in the main club against a friendly expert pair who was known by my partner. During the play I did take my time and it must have seemed slow to the table and to the many kibs. Nevertheless, In more serious bridge I have liked to have known about opps overcalls and carding methods. I will take you through my thinking:
West led ♥A, east playing the 10, and then switched to ♦10, east following to my ♦A. My first thought was the best line would be 3 club ruffs to add to the 9 top tricks. So I played a small club, ruffing in dummy with east and west playing the 3 and 6 respectively. I next played a small heart from dummy (I know.... should have played the queen.... you might get lucky and it can't cost) and ruffed with 2 in hand. Next another low club, ruffing in dummy with west-east playing 9 and 7. Next a bad slip. I should play another heart from dummy to ruff in hand which would reveal the heart position. I didn't because I already had a fixed view that west had 6 hearts. I was also pre-occupied with the thought that west might have 2 clubs and would over ruff my 3rd club. I then realised that if this were so, I didn't need to ruff a 3rd club because east would then control clubs and spades and if I drew trumps east would be squeezed. So accordingly I played dummy's last trump..... Was this thinking a house of cards to come tumbling down? Anything to add on bidding and play?

Help

1♦ 1♠
2♣ 3♦
4NT 6♣
6♦ p
Opps passing throughout
Playing 1340 I thought that 6♣ probably showed a club void and 1 ace