For three quarters on Sunday, the Redskins rode a solid gameplan, gritty defense and a scintillating performance from Mark Brunell, taking a lead on the visiting Seattle Seahawks. In the end, however, it took some late-game heroics and a few lucky breaks to secure the win and remain undefeated as the team pulled out a 20-17 overtime win. What’s to be done when your team has a peerless defensive side but an offense that’s…