A strategy found on a number of places is to bet on Red and the 2nd Column.
For example site 'How to win Roulette'
and site 'The Insider System' talk
about it.
The strategy is to bet $1 on Red and $1 on the 2nd Column. The 2nd Column has 4 Reds and 8 Black numbers.
So in total 18 (Red) + 8 (Black) = 26 numbers are covered. This gives 70% chance on payout the 1st roulette spin. However since you
are betting $2, and the payout of the Red bet is $1, there is a high chance of playing even.
If the outcome is a Red that is not in the 2nd Column, you gain $1, but since you also lost $1 (the Column bet), you play even.
If the outcome is a Black in the 2nd Column, you gain $2, but since you also lost $1 (the Red bet), you gain only $1. If the outcome
is a Red in the 2nd Column, you gain $3. Finally if the outcome is one of the other 13 numbers, you lose all $2.

The graph below shows the chance to come out winning with this strategy for 1 - 10 roulette spins.
The chance to win is barely higher than 40%. The chance to win OR play even is about 50%, but slowly drops as the
number of roulette spins increases. The problem is that most of the Red wins result in an even outcome with no gain, while a losing
spin results in a loss of $2, that needs a win in the Column to recover.

So to conclude this strategy performs maybe more constant in win chance than betting only $1 on Red/Black only. But you will not win more with it.
Overall the strategy does not make it above 70% win chance to start to make it interesting.
Next page shows a variant of this strategy.