Bet 1 unit. If you win, bet 3. If you win again, bet 2, then 6. After the fourth win or any loss, go back to 1. Lose on the first bet and you lose 1 unit; on the second, 2 units; on the third you are still up 2; on the fourth you break even.
Four reds in a row come up 5.6% of the time: the full cycle is rare, but it pays 12 units while the worst cycle costs 2.
Test it on 2,000 sessions
Fixed layout: 14 units on 19-36, 5 on the 13-18 six line, 1 on zero.
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sessions end in profit
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sessions run out of money
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median session
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worst session
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best session
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sessions hit the table maximum
One session, spin by spin
Every session is played with the same random draw as the table above. Nothing here is an estimate.
1-3-2-6 strategy: questions
Why 1-3-2-6 and not 1-2-4-8?
Dropping from 3 to 2 on the third bet locks in a profit: even if the third or fourth bet loses, the cycle does not cost more than it earned.