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21Blackjack
Advanced

Omega II System

Complete Advantage Play Strategy Guide

21
21

Blackjack

Quick Stats

Expected Edge

1.0-2.0%

Bankroll Required

High ($5,000+)

Time to Learn

2-3 months

Additional Metrics

betting Correlation
99%
playing Efficiency
67%
insurance Correlation
85%

Overview

A powerful level-two counting system that offers superior betting efficiency. More complex than Hi-Lo but provides better accuracy for serious advantage players.

Strategy

Assign +1 to cards 2, 3, and 7; +2 to 4, 5, and 6; -1 to 9; and -2 to 10-value cards. Aces are neutral. Maintain running count, convert to true count, and use a separate ace side count for maximum accuracy. Requires significant concentration.

What to Look For

  • High-limit rooms with favorable rules
  • Games with deep penetration (80%+)
  • Liberal double down and split rules
  • High table maximums for spreading

Risks & Considerations

  • Much more susceptible to counting errors under casino conditions
  • Requires extreme focus for extended sessions
  • Higher stakes needed to justify complexity
  • More likely to draw attention with larger bet spreads

Pro Tip

Always start with proper bankroll management. Even with an edge, variance can be brutal. Never risk more than 1-2% of your total bankroll on a single session, and ensure you have at least 20-30 buy-ins for your chosen stakes.

Basic Strategy Chart

4-6 Decks, S17, DAS, Late Surrender

Legend
HHit
SStand
DDouble (Hit if not allowed)
DSDouble (Stand if not allowed)
PSplit
RhSurrender (Hit if not allowed)
RsSurrender (Stand if not allowed)
Hard Total2345678910A
9
H
D
D
D
D
H
H
H
H
H
10
D
D
D
D
D
D
D
D
H
H
11
D
D
D
D
D
D
D
D
D
D
12
H
H
S
S
S
H
H
H
H
H
13
S
S
S
S
S
H
H
H
H
H
14
S
S
S
S
S
H
H
H
H
H
15
S
S
S
S
S
H
H
H
Rh
Rh
16
S
S
S
S
S
H
H
Rh
Rh
Rh
5-8
H
H
H
H
H
H
H
H
H
H
17+
S
S
S
S
S
S
S
S
S
S

Pro Tips

  • • Always split Aces and 8s
  • • Never split 5s or 10s
  • • Double down on 11 against everything except Ace
  • • Stand on 17 or higher (except soft 17)
  • • Never take insurance (unless counting cards at TC +3)

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