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5. 1S OPENING

REQUIREMENT: 10-14 HCP, 4+/4+ minors, may be three-suited

The 1S relay structure is truly symmetric, and also uses a forcing 1NT response similar to the 1D and 1H openings.

RESPONSES SUMMARY

Pass To play with spades
1NT Balanced or semi-balanced hand, 0-11, forcing.
2C GAME FORCE RELAY
2D Signoff
2H Fit showing jump for a minor - 2NT inquires
2S Fit showing jump for a minor - 2NT inquires
2NT Pre-emptive with both minors
3C Pre-emptive
3D Pre-emptive
3H Pre-emptive with 9 cards in hearts and a minor
3S Pre-emptive with 9 cards in spades and a minor
3NT To play
4C Preemptive
4D Preemptive

After 1S-1N

Opener is expected to bid a 5-card suit. Exceptionally this might be 2H or 2S in a 0544 or 5044 hand. Only 1444 or 4144 hands may be passed.
Further bidding is not constructive.

After 1S-2C

2D Three-suiter with both minors (see 1C opening structure section 2.4 for relay continuations)
2H Reverser: 5+ C, 4D
2S 5/5
2NT High shortage, 5+D, 4C, etc.