The San Francisco 49ers don't play the Seattle Seahawks until Sept. 15, but the move-for-move offseason chess match between the two wages on.

One day after the Seahawks claimed long snapper Kyle Nelson, released this week by the 49ers, San Francisco on Friday turned around and claimed receiver Charly Martin off waivers. Not moves we'd normally post about, but the transactions emphasize the ongoing off-the-field cold war between these NFC West rivals.

As Eric Branch of the San Francisco Chronicle notes, it's possible both players were grabbed to gather intelligence. Gleaning even the smallest detail about the opponent would make a minor roster move in July worth the effort.