bluejak, on 2010-December-11, 23:24, said:
I am not sure a considerable part is the correct consideration. For the offending side do we believe that East would have doubled to show four spades if North's bid had been described as hearts and spades? If not - and it seems pretty unlikely - then we appear to have damage so should adjust.
Having decided that we can then consider Law 12C1B and decide whether to adjust for the non-offenders as well.
"If, subsequent to the irregularity, the non-offending side has
contributed to its own damage by a serious error (unrelated to the
infraction) or by wild or gambling action it does not receive relief in the
adjustment for such part of the damage as is self-inflicted."
My intention was that jumping to 3NT opposite merely a competitive partner with an ordinary 16 hcp is a serious error as would be doubling with a six count if the expectation was that it showed some game interest.
Therefore the non-offenders have contributed to their own demise. To that extent they are not entitled to redress.
If double was non-systemic and showed extra then the entire bad result could have been avoided by a more normal action and I would give them no redress.
If double was merely competitive then the jump to 3NT is reckless and we need to consider what contract would be played with a less reckless action and if necessary calculate the difference in score between 3NT and that more normal action and then adjust to 2H-2 or -3 with an appropriate adjustment for the self infliction damage.