Commentary: Lessons in negotiation tactics that work in war and everyday life

When I was 12, playing Risk, “the game of world conquest,” my father and opponent, Herb Cohen, who’d recently published his bestselling book “You Can Negotiate Anything,” taught me a lesson about deal-making I’ve never forgotten.

My troops were clustered in Ukraine and southern Europe. Surrounded and outnumbered, I asked what I could offer him to call off the attack. He looked at the board, looked at me, then said, “Your Snickers bar.”

“My Snickers bar?” (I’d been saving a Snickers bar.) “But that’s not part of the game.”

“Lesson One,” he said. “Everything