X4

4.1 Balanced Minimum

4.2 1-Suited Minimum

4.3 Strong Balanced Hand

4.4 Another Strong Balanced Hand

4.5 Vs. Takeout Double

4.6 Vs. 2-Level Overall

4.7 Penalty Double?

4.8 Pattern Out

4.9 Minor Suit Response

4.10 Vs. 3-Level Interference