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[hv=pc=n&n=skj72hj98754dca83&d=n&v=b&b=13&a=p1c1dp1hp2hp2sp3dp]133|200[/hv] The event is Swiss teams in Switzerland. IMP scoring, 7-board matches converted to VPs. There's a range of teams in the field but the opposing team on this hand is world class. You and partner play 2/1 with multi 2♦; no particular discussion about this auction.

Please can the experts help.... bidding goes 2♥2♠3♥double ... is this a penalty double????

I agree with the opening pass, given the agreements. But I would probably splinter 4D over partner's 2H: this is IMPs and I want to be in the vulnerable game here, partner should be able to figure out my spades and reevaluate his diamonds and decide whether slam seeking has any sense.

If you're going to be that pedantic, yes. But, to use your notation, 12C1(b) then says adjusted score = F(x). Law 12C1(b) says "The Director in awarding an assigned adjusted score should seek to recover as nearly as possible the probable outcome of the board had the infraction not occurred." Since Law 64C2(a) says "After repeated revokes by the same player in the same suit (see B2 above), the Director adjusts the score if the non-offending side would likely have made more tricks had one or more of the subsequent revokes not occurred" then "the infraction" for which we are adjusting is the subsequent (here second) revoke, and the effect is that 12C1(b) means in this case that we are to assign "the probable outcome of the board had the" second revoke "not occurred". You're drawing a distinction without a difference.

I guess Swedish system regulations are the main reason you open 2♣ instead of 1♦ with (41)35. (1♦ = "4+ D" gets 0 dots, whereas 1♦ = "4+ D or (41)35" gets 2 dots.) Your "12-15" range sounds rule of 21-ish to me, so I assume you already pass hands with 10-11 hcp and either (41)35 or 4405 shape. Since most of these are opened by virtually all tournament players these days, your system appears to have a hint of Silent Club to it, by comparison. But if you don't mind taking your system a tiny step further in the direction of Silent Club, how about P = "normal" OR 10-12 hcp and either (41)35 or 4405 2♣ = "(10?)12-15, 6+ C" OR 13-15, (41)35 or 4405 ? Here the 2♣ opening promises either 6+ C or MAX, so every sequence that currently ought to be F2N only, like the sequence 2♣-2♦; 2♠-2N(NF) in classic Precision, can now quite comfortably be played as F3♣.

Assume you're in a partnership where, after 1♣-1♦-1♥, all your spade bids are natural. In other words, you're not playing any form of 4th suit forcing nor any splinters. (Presumably, this is because partner is a (life) novice who hasn't learned or can't remember these conventions.) Then you're choosing between 4♥ and 4N, and I think 4N is a worthwhile gamble.

This auction depends on the skill of the opponents, the state of the score, dinner, drink, and at rubber bridge the amount of coin of the realm. South has the safety of a good suit, so do what you want. The Bridge World used to have the feature You Be the Judge where entrants chose the worst action and assigned fault in per cent. Here, I think the single worst bid was the Takeout Double at rubber, but every other bid was also a fault. North should show a limit raise and let partner captain the auction. East should pass 4 hearts or if rich double (sort of responsive?). The final double has merit if you are rich or have other info about the opposition. But wonderful defense!!