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Negative 1♦

Relay structure from Viking Precision 2007 nest very strong hands into 1♣-1♦-1♥. This treatment rescues the 2NT opening from the notrump ladder and frees 2NT up for preemptive uses.

1♣-1♦-ART NEG, 0–7
1♥!ART F, 19+
1♠16–19, UNBAL 4+♠
1NT16–18, BAL
2♣♦♥16–19, UNBAL 5+#
2♠!16–19, 4+♥, 6+♦♣
2NT!16–19, 5♥(440)
3♣♦!16–19, 5+#, 5+♥
3♥!16–19, 6+♥, 4+♠
3♠16–19, 7+♠
1♣-1♦-2♠-16–19, 4+♥, 6+♦♣
2NT!Ask for the minor suit
3♣!P/C
3♦!INV+, 4+♥

Strong 1♥

1♣-1♦-1♥-ART F, 19+
1♠!DBL NEG, 0–4
1NTBAL FG, 2–4♠, 2–4♥, 2–5♦, 2–5♣
2♣♦UNBAL FG, 5+#
2♥♠FG, 5–6#
2NT!FG, (4441)
3♣!FG, 5+♦, 5+♣
3♦!FG, 5+♠, 5+♥
3♥♠FG, 7+#
1♣-1♦-1♥-1♠-DBL NEG, 0–4
1NTBAL 19–21
2♣!20–23, 2+♣
2♦20–23, 5+♦ or 4♦(441)
2♥♠20–23, 5+#
2NTNAT FG
1♣-1♦-1♥-1NT-BAL FG
2♣!STAY