
This is what I've come up with - first of all, is the ruling correct; secondly, have I missed a relevant law or quoted an irrelevant law?
i “It’s best to state a line of play when claiming, however, on this fortunate layout, any normal line of play will result in you taking all three tricks” (69A, 70C3, 70E1, 71.2. The agreement has not been established)
ii The board can still be re-scored as if declarer had taken the last three tricks (69B, 71.2, 79A2, 79C1-2. The agreement has been established but can be withdrawn)
Thank you very much