A redouble can have one of three meanings:
To play if:
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your side is at the four level or higher:
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4♠ — (Double) — Redouble: Penalty
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the opponents double a conventional bid:
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1NT — (Pass) — 2♦ — (Double) — Redouble: Penalty, good diamond suit;
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A good hand if:
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their double is for takeout:
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1♠ — (Double) — Redouble: 10+ points;
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SOS, requesting a different suit if:
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your side is doubled for penalty in a trump suit at the three level or lower:
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1♦ — (Pass) — Pass — (Double); Pass — (Pass) — Redouble: SOS, responder can support at least two of the unbid suits.
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