2/1 context. 2♦ rebid likely on 6...
The coffeehousing discussion has identified 2 or 3 possibilities:
1) Constructive black suit takeout - too weak to double or overcall at first...
2) Opening hand (+) takeout of ♥, unable/unwilling to overcall ♠ on a 4-card suit, penalty overtones toward ♦
3) 4=4=4=1 or 4=4=3=2 with constructive or opening (+) values.
What would expert standard suggest? What do you think South holds?
Regards,
Steve