01The guides

Bidding
When to call trump and when to pass: counting trump and side aces, the dealer’s swap, and how your seat changes both.
Going alone
When a lone hand is worth the gamble, the arithmetic behind it, and how the score changes the call.
Defence
How to euchre the makers: leading through them, saving trump, signalling your partner and defending a lone hand.

02Four principles

Before the detail, keep these in mind. They apply to every hand.

Count your trump before you bid
Before you call or pass, count your trump, including the turned card if your side would pick it up. Three trump is the usual baseline for a call; two needs strong side cards.
Track what’s been played
There are only 24 cards. Keeping count of the trump and aces that have fallen gives you a real edge in the last tricks.
Talk through your cards
Leading an ace says you own that suit; leading low can draw out trump. Your partner reads your plays as closely as your opponents do.
Your seat matters
On the dealer’s left you speak first in both rounds and lead the first trick. Under stick the dealer, the dealer must call if everyone passes, and everyone else knows it.