Due to private agreement with partner on using our own convention card: our Next Generation SAYC for Match Point v.2.8a, we play the first DBL by North as negative DBL with 8+HCP [or 14+SP(our own hand evaluation method)] with at least 4-3 Major suits (ideally 4-4). At the second DBL by South/Opener, again per our private agreement, Opener showed specifically 4 cards Spade with potential 2-4 cards Heart and 11+HCP, so that it allows the 3H bid by Opener to show limit 11-14HCP with specifically 4/5 cards Heart suit and possible 2-3 cards of Spade suit and Pass as a Forcing Pass if their 3C bid is pre-emptive, or as Semi-Forcing Pass if their 3C response was constructive. Slam bidding is deliberately forfeited for MP applications. If for KO events, the 3H bid might be modified via further discussion. The above is just our specific way to use the DBL made by Opener. If the Opener RHO jumps to 4C instead of 3C, Opener's DBL is entirely different. Such DBL is again our own arrangement to declare we want to out bid their 4C with 4M, but pass is neutral, not a forcing pass. This is an interesting bidding sequence. :) BFone