That's right. This is implemented internally as a step-then-slide move, same as the Gryphon move.
Upon further consideration, this leads to a question. "yafsF", the Gryphon move step-then-slide move, by itself, does not allow stoppong on the F square. So, should "yafsF3" count the ferz-step toward the max range of 3? I tried this on the sandbox and it seems to just lock it up. My feeling is that it should probably count.
Upon further consideration, this leads to a question. "yafsF", the Gryphon move step-then-slide move, by itself, does not allow stoppong on the F square. So, should "yafsF3" count the ferz-step toward the max range of 3? I tried this on the sandbox and it seems to just lock it up. My feeling is that it should probably count.