The Rule of turning bridges is a principle of block pushing similar to the rule of double bridges, but used whenever the bridge begins to turn, hence its name. As a bridge one square wide cannot be turned, unless Chip has flippers and needs to use the blocks for some other purpose than filling in water, a double bridge has to be built out into the water, and then using the space on the side, Chip can then turn. Generally, the rules of double bridges and turning bridges can be combined, even for extremely trivial gains.