Matchpoints; Table result NS+500.
This was an interesting hand from a North London club on Tuesday, and West's imaginative sacrifice in Five Clubs needs some explaining. After North splintered with 4♣, East called the TD and stated that he thought there was a failure to alert. He recalled from a previous hand that NS played splinters over 1M; he also struggled to construct a non-alertable meaning of 4♣. The TD rushed over and asked South whether his partner's bid was alertable. "I don't think so," replied South, "it is a splinter but it is over 3NT, isn't it?" "That has changed", replied the TD, "please alert any bids over 3NT on the first round of the auction if they are artificial". When the auction came round to SB, West, all was clear. He had agreed with this partner that doubling a splinter said "don't lead this suit", so his partner could well have good clubs for his pass. They played that a double of Gerber said "Lead a club", so his partner had to call the TD when there was an infraction; his partner clearly would have doubled if 4♣ had been Gerber (or even Swiss or similar), but did not want to double a splinter. He thought that the TD call was authorized information, and he backed his judgement by saving in Five Clubs. North made a forcing pass, but it was tough for South to go on to Five Spades. South thought that SB had used the UI of the TD call, but SB claimed that he used information arising from the legal procedures authorized in the Laws, and this was AI. He began to quote 16A1c in full, but the TD told him not to do his job for him. How do you rule?