The Chilli bidding system

	West	North	East	South
	pass	pass	1	pass
	2

Forcing, as West's hand is not limited. A pass in first or second hand is a non-limiter and effectively ignored in subsequent bidding.

	West	North	East	South
K10742			1	pass
K3	1	pass	2	pass
J83	?
AQ5

Bid 2, forcing. Neither 1 nor 2 are limiters. This is an easy one to get wrong on first encounter. Notice how in 'natural' systems you must invent an artificial force such as 2, fourth suit forcing. In Chilli, 2 would be natural.

	West	North	East	South
	1	pass	1NT	pass
	2

Forcing. Neither 1 nor 2 are limiters.

	West	North	East	South
			1	pass
	2	pass	2	pass
	2

Forcing, as neither 2 nor 2 are limiters. . Returning to partner's major is only a suggestion and does not set the suit. East must bid, even though his non-Chilli instincts may tell him otherwise.

	West	North	East	South
			1	pass
	2	pass	2	pass
	3

Forcing and natural, showing five diamonds. The fourth suit is always natural if it can be.

	West	North	East	South
			1NT	pass
	2

Forcing, not because it's Stayman, but because it's natural and not a limiter.

	West	North	East	South
	1	pass	2	pass
	2NT

Natural, but not a limiter and nor was 1, so forcing. Opener here could have bid 3NT to play, so 2NT is either strong but unsure or very strong and waiting.