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Strong 1

Blueberry employs an approach similar to Viking Precision 2007.

1-STR ART, 16+
1!ART NEG, 0–7
1!FG, 5+ or BAL 13+
1FG, 5+
1NTBAL FG, 8–12
2UNBAL FG, 5+#
2!FG, 5+ 4+ minors
2!FG, 8–12, (4441)
2NT!S/T, 13+, (4441)
3!FG, SOL 7+ suit
3FG, S-SOL 7+#
3NT!FG, S-SOL 7+
4!PRE, S-SOL 7+, 0–1 outside A/K
4!PRE, SOL 7+, no outside A/K
4PRE, 7+#