Bridge
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Standard American Yellow Card
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overcaller
Opponent interference at this turn.
Pass
Pass
0-5 HCP
1♥
1♥
6+ HCP · 4+ hearts
1♠
1♠
6+ HCP · 4+ spades · fewer hearts than spades
1NT
1NT
6-10 HCP · no 4-card major · no diamond fit, balanced-ish
2♦
2♦
6-10 HCP · 4+ diamonds · no 4-card major
2NT
2NT
11-12 HCP · balanced · no 4-card major
3NT
3NT
13-15 HCP · balanced · no 4-card major