All dominobuilders need to build a 90º or even a 180º turn from time to time. Turns are very likely to fail if not enough dominoes are used in it or if they are placed too far from each other.
Building: Place the dominoes close together, but they should not touch each other.
90º: It is recommended to use at least 7 dominoes in a 90º turn to make it work 100% .
180º: It is recommended to use at least 13-15 dominoes in a 180º turn to make it work 100%