Cockroach Pig (曱甴路, lookback 3) is the third and final casino derived road, rendered with diagonal slashes (`/`). Many players struggle to visualize a pattern that repeats every 3 columns while changing every 1 and 2 columns. This 73-hand shoe opens with a textbook 3-column period: depths `1, 2, 3, 1, 2, 3, 1, 2, 3`.
Cockroach Pig waits until Column 4 Row 2 or Column 5 Row 1 to record its first slash. In our `1, 2, 3, 1, 2, 3` cycle, Column 4 has depth 1 (so Row 2 is never reached in Column 4), and Cockroach Pig starts at Column 5 Row 1: Rule 1 compares Column 4 (depth 1) with Column 1 (`4 - 3 = 1`, depth 1) → Same depth → Red (=)! As Column 5 drops to Row 2, Rule 2 looks 3 columns back to Column 2 (depth 2) → Bead exists at Row 2 → Red (=)!