Check plate for tensioning tyre chains

The locking plate (1) has a locking slot (10), where width of the locking slot is greater than thickness and smaller than an outer width of chain links of a tensioning chain (46). A passage opening is provided with an inner contour, in which outer contour of the tensioning chain is inscribed. An independent claim is also included for an assembly for clamping a tire chain by a tensioning chain.