A few days ago, I was dealt this hand as West at a bridge game (South was dealer, EW vulnerable): [hv=pc=n&w=sjt95hq7dajt762c3]133|100[/hv] South opened the bidding with 1♣, and I overcalled 1♦. North then bid 4♣, suggesting that he had at least 5 clubs. Surprisingly, my partner then bid 5♦, implying that he held 6 diamonds. South then bid 6♣ (I strongly suspected that he held the void in diamonds and a lot of clubs). Despite being vulnerable, I decided to take my chances bidding to the 'level of the fit' and bid 6 diamonds. Obviously South doubled me. The layout turned out to be: [hv=pc=n&s=sa7hj9853dcakj764&w=sjt95hq7dajt762c3&n=sq8hakt62dqcqt982&e=sk6432h4dk98543c5]399|300[/hv] So, with hindsight, I was 'correct' to bid 6♦ (we were down 2, costing us 500 points, while the opponents would have made 500+120 points with their slam (drawing trumps, cashing all their hearts and winning ♠A)). However, what should actually have been done in the situation (or in similar situations where you have a weak hand but a massive fit in another suit)? EDIT: Sorry I forgot to mention that we were playing rubber bridge and NS had earlier made 1♥.