If I open 1♦ with ♠Kx♥AJx♦KT9xxx♣xx, I will rather rebid 2♦ on 1♥, NOT 2♥, because I HAVE 6♦ AND A LIGHT OPENING.
If I open 1♦ with ♠x♥AKx♦Qxxxx♣Axxx, I will rather rebid 2♥ on West's ...
4♦ by East, with the ♠ fit but nothing in ♦, surprised me. Richard Fleet's comment (see above) informed me: 4♦ was doubtless a BLUHMER.
An INTERNET search followed:
In the right context, a BLUHMER is a jump bid, usually in the partner's short suit. This ...