2♠ -

10-13, 6 card ♠

2NT    =    implies 3+ card ♠ fit, asking    ➲

3♣    =    implies no fit, asking    ➲

3♦/♥   =    natural, F3♠

3♠       =    preemptive

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

4♣/♦/♥ =    splinter

4♠    =    TP (does not trigger Fpass)

If opps intervene    ➲