Give 'em a nudge. Is your opponent intentionally stalling, or slowing down the game hoping to make you quit? Watch for the Nudge button to appear. By clicking it, you'll force the other player to make a move, or be disconnected from the game.
Attack first. Be the first to capture a piece, and then force a series of equal captures. You'll usually win in this scenario.
Go for two. Try capturing two checkers during a turn so that your opponent will struggle to rescue both. This will weaken your opponent's defenses.
Lose one to get two. Strategically sacrifice checkers to force uneven capture trades. For example, let your opponent capture one of your pieces if you can take two enemy checkers on your next turn.
Be defensive. Position checkers so you can respond to captures with a counter strike. Also, don't spread your pieces too far apart, since it opens you to multiple losses in a single turn.
Think ahead. Increase the number of moves you can make during a turn while limiting your opponent's options. If possible, place checkers to strategically block your opponent's movements.
Back away. Don't vacate your back row too soon. That way, your opponent can't mint kings.