Blind solving refers to a plate solve attempt that provides no "hints" to the solver (e.g. location, scale, etc). The solvers are extremely robust, but this resilience cones at the cost of time. Some blind solvers take considerably longer to solve than a non-blind solver. Because of this, it is recommended that any blind solver you have included in you solve chain be placed near the end. In this way, your sequence will always attempt to solve the current frame in the fastest way possible and, if it fails, will continue down the chain until, eventually reaching the blind solver as a last resort.

You can quickly identify supported blind solvers in SGPro by looking for the "eye" icon as such: