Suppose the bidding starts:
1♥ - 2♥
or 1♠ - 2♠.
The trump suit is set, both partners know the final contract will be in that agreed suit.
Responder has shown 6-10 points, so:
if Opener has a minimum (13-15 point) hand he will pass, knowing there is no game, and
if Opener has a maximum (19-21 point) hand he will bid the game (4♥/4♠).
When Opener has a medium (16-18 point) hand he cannot tell yet whether game is possible.
In standard bidding he can INVITE by bidding 3 of the suit. This tells Responder to pass the 3-bid
if he has 6 or 7 points, but bid game if he holds 9 or 10 points.
Help Suit Game Try is an improvement on that invitational 3-bid. Rather than bidding 3 of the agreed
suit, Opener bids a DIFFERENT suit at his second turn. This cannot be an attempt to find a fit because
an 8-card Major fit has already been found. It is just the same invitation, asking partner to bid
game in the agreed suit with 9-10 points, to pass with 6-7 points, BUT TO USE HIS HOLDING IN THE
NEW SUIT if he has a 'close-call'. In other words, if Responder has Help in that suit he should bend
over backward to bid the game.
Bidding sequences like:
1♥ - 2♥
3♥ - 4♥
will be replaced by:
1♥ - 2♥
3♣ - 4♥
Lesson available.