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The case Law in England was when a player opened a Benjamin 2♦ [equivalent to an Acol 2♣] at a time when it was illegal to psyche such bids. The player had forgotten that she played Benjamin with this partner, so she had opened what she believed to be a Multi 2♦. Pass, 2♥, Pass, Pass to a player with an excellent knowledge of the Laws and Regulations. He held a 4=1=4=4 12 count and passed, which was not a success, since 4♠ was cold.
He argued that since the opponents were not allowed to psyche a Benjamin 2♦ he assumed the pass was a mistake and he saw no need to re-open. In England if you use an illegal convention then the board is scored as Ave-/Ave+ to the user under Law 12C1D and a Regulation [unless the non-offending side does better than Ave+]. He thus asked for Ave+.
The TD decided that the bid was a misbid not a psyche and ruled result stood. The AC upheld the TD and commented they nearly kept the deposit. The L&EC upheld the TD, pointing out that the Regulation only covered psyches, not misbids.
I think this is crazy. In jurisdictions that have regulations on what bids can be psyched, what difference can it make whether you "meant" to psyche or not? Presumably the regulation was meant to protect the opponents, and you have fu cked up their auction every bit as much as if you had done it on purpose.
Why does "it was a mistake" absolve a person of responsibility? This evening, I took a wrong view and misplayed a hand badly. Should I get the score adjusted, as it was a mistake? This sort of reasoning works very well for exams. If I have got a question wrong, obviously it is because I have made a mistake. Should I score 100% every time, since mistakes don't count?
And on a slightly different subject -- is it legal to regulate which categories of bids can and cannot be psyched?