*This article is out of date. An updated copy is kept here*

A good HUD, though vital, is pretty easy to implement.

These are the statistics I use on my on-table HUD for common reference:

BB Call / SB Open / 3Bet

Notice that I don't use VPIP or PFR in my HUD. While these are common stats for figuring out a person's range in a ring game, heads-up players are either in position or out of position. Therefore, we can simplify our decision-making regarding ranges by taking the number shown on our hud and entering it directly into our calculations. If the "SB Open" value is "75%" this tells me a lot more about what hands my opponent raises on the button than the equivalent PFR number. Likewise, the BB Call stat tells me the opponent's call-out-of-position range which goes into making decisions while in position on nearly every street.

Cbet / Turn Cbet

These numbers are vital in a HUD; both the flop and the double barrel percentage give me information about how strong my hand needs to be to continue in a hand. If these numbers are too high, the opponent is ripe for bluff-checkraising.

Fold to Cbet / Fold to Turn Cbet 

The fold-to-cbet stat is one of my most prized stats. If this number is too high, you can almost always take a Raise+Cbet line with any two cards from the button. The fold-to-turn-cbet stat hardly ever gets a large enough sample to be useful, but it can draw out some inconsistencies in the opponent's play, like his vulnerability to two-barrelling.

Donks flop raised pot / Folds donk to raise

When multi-tabling different opponents, it's important to know at a moment's notice whether or not the opponent regularly donk bets or rarely donk bets. This stat will lead you to play weak hands in position with more accuracy. Early in a match, tend to raise donk bets religiously in order to get a good sample on the folds-donk-to-raise stat, because a player who donks a majority of his weak hands (and folds them) is ripe for exploitive play.

These are the statistics I regularly check on my pop-up HUD to make decisions:

Folds to 3Bet, Check-raises flop, Aggression factor (indiv. streets), Bets vs Missed Cbet

Some combination of these factors and whether they are lower or higher than average allow me to decide pretty clearly between good lines while playing 8 tables.

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::: Sage