Abstract: This invention concerns a system for sorting elongated random width wood boards and preparing board rows having a row width within a predetermined width range. The system comprises a main longitudinal surface, a conveyor for conveying the boards on the main surface, a width detector, and accumulating compartments located one after the other under the main surface, controllable traps located on the main surface providing access to the accumulating compartments, controllable gates for retaining or releasing the boards accumulated therein and a controller. The controller selectively distributes each of the boards into the accumulating compartments, and controls the gates of the accumulating compartments to release the boards accumulated therein when the sum of the widths of the boards accumulated is within the predetermined width range.