2♥ -

10-13, 6 card ♥

2♠    =    implies 3+ card ♥, asking    ➲

2NT =    5+ card ♠, F1

3♣    =    implies no fit, asking    ➲

3♦   =    natural, F3♥

3♥    =    preemptive

3♠    =    splinter 

3NT  =    TP, OP must pass; 3NT over 2NT suggests the contract

4♣/♦  =    splinter

4M    =    TP (does not trigger Fpass)

If opps intervene    ➲