After opening 1♣/♦ and interference of 1♥, our players were taught to play that X by Responder is negative (Sputnik) showing 4=card spades whereas 1♠ is F1 with 5+card spades.
Opener's rebid over 1♠ is basically natural: 2♠ is a simple raise (3+card), 3♠ is an invitational raise.
Opener's rebid over X showing 4=card spades is less well defined. What do others feel 1♠, 2♠, 3♠ should promise here?
And what should a 2♥ cue mean in both situations?
I'm just hoping to better define this basic system here, not looking for alternatives at this moment. I realise for instance that there are good reasons for putting 4+ spades through X and playing 1♠ as artificial, but I have a large pool of intermediates playing this stuff and they don't want change, just clarity.