Two Column Roulette Strategy
Two columns coverage bets one unit on each of two columns. Covers 24 numbers. Net +1 unit on hit, −2 on miss. Same math as two-dozens coverage.
How it works
Place equal stakes on any two of three columns. You cover 24 of 37 numbers on European.
If either covered column hits, net +1 unit. Otherwise net −2 units. Mathematically identical to Two Dozens.
Pick columns or dozens?
Mathematically there is no difference. Choose based on visual preference. Some players combine one column with one dozen to overlap on specific numbers - that gives different coverage and different EV per hit.
Note: combining 1st column and 1st dozen overlaps on 1, 4, 7, 10 - so total unique coverage is 20 numbers, not 24.
Test results
Same as Two Dozens: 200 rounds of $10 + $10 produces expected loss ~$108, typical drawdown $80-$200.
Two columns vs Two dozens
No difference in math. Difference only in the physical numbers covered, which has no impact on the wheel's probabilities.