Deviations

Deviations are changes from basic strategy when TC reaches a specific threshold. The Illustrious 18 are among the most valuable Hi-Lo index plays.

The app uses the TC shown on screen. A deviation applies only when TC reaches the table threshold; otherwise it falls back to basic strategy.

Situation	Threshold	Deviation
Insurance	TC >= +3	Take Insurance
16 vs 10	TC >= 0	Stand if surrender is unavailable
15 vs 10	TC >= +4	Stand if surrender is unavailable
10 vs 10	TC >= +4	Double
16 vs 9	TC >= +5	Stand
13 vs 2	TC >= -1	Stand
13 vs 3	TC >= -2	Stand
12 vs 2	TC >= +3	Stand
12 vs 3	TC >= +2	Stand
11 vs A	TC >= +1	Double
10 vs A	TC >= +4	Double
9 vs 2	TC >= +1	Double
9 vs 7	TC >= +3	Double
10,10 vs 5	TC >= +5	Split
10,10 vs 6	TC >= +4	Split
12 vs 4	TC < 0	Hit
12 vs 5	TC < -2	Hit
12 vs 6	TC < -1	Hit

Fab 4 refers to four important late-surrender index plays in Hi-Lo.