In Competition

Opps double our artificial bid 1♣ - (pass) - 1♦/♥ - (dbl) - 

pass    =    11-13, no 3 card support or 4 card ♦/♥, RE redoubles if she holds 10+ HCP

1♥/♠     =     11-13, 3 card support

rdbl    =    17-19 balanced, NST

1NT    =    17-19 balanced, ST in ♦/♥

2♣    =    natural

2♦ (cue incl.)    =    4 card support, 17-19 balanced or 17+ unbalanced, system on

2♥ (cue)    =    F1, asking for ST, control if later above 3NT

other         =    system on