E-W were playing 2/1 GF.
East opened 1♦. Partner responded 1♥. So far, so good.
East's rebid was 1NT. West bid 2♣, a relay to 2♦ as a part of a 2-way Stayman approach. East bid 2♦. West bid 2♥, showing an invitational hand with five hearts. East bid 3♦, a call that was not discussed. West passed.
The end result was below average because East guessed to finesse the diamond Jack, catching Qx behind. +130. +150 would have been average plus.
3NT from West makes if diamonds are guessed. 3NT from East is hopeless (lead difference). 3NT making was a near-top. 3NT down was a near bottom.
East claimed that West should have jumped to 4♥ after the 3♦ call. He argued that the heart AQJ was a strong-enough holding to merit this bid. This was attributed as a charge for the poor overall result. 4♥, BTW, can be made on very careful play if you guess diamonds right. Making is a near top; down one is a near bottom.
West argued that 3♦ was anti-partnership as not discussed. West argued that 2♦ was the normal rebid with six diamond and that "super-accepting" the 2♣ relay with a 3♦ call might show this hand, if this was possible. West argued that East should not usually whip out an undiscussed bid but that it worked this time and that the pair reached the right contract.
East rebutted that 3♦ should not have been misunderstood, even without agreement.
West agreed that 3♦ was not in practice misunderstood and that passing was correct.
Assess.

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