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Kaplan(?) Inversion

When I started to play seriously in the late 70's I was aware of this treatment,it was called 'inverted spade/notrump' and was part of 'Cambridge Precision' the system developed in the early 70's by a strong group of students at the university.

Now Jeff Rubens has been calling this the Kaplan Inversion for quite a while - he should be in the best position to know given his long association with Edgar. However it seems not to be part of the Kaplan/Sheinwold system and I wondered if anyone can tell me the precise story of its gestation. 

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