If you can tell then he's not doing it, if you can't tell then you will never know.
If you end up broke at the end of the night by a guy who can't play and you were sure you 'should' have beat......
Then you just were.....
True, but only if he's doing it right. Few can mask it very well. All depends on how observant the target/victim is too. A superior player can play down to the opponent, but the inferior player has a hard time "seeing" the signs of whether someone truly is stronger than them. There are some things that are hard for anyone to hide, they are subtle, but they are there. Weaker players tend to measure skill by the results on the table. That's what the hustler is hoping for.
Hustler detection requires a keen eye, and a good memory. But most of all, a clear head. They count on you to get emotionally involved. To believe you can win, to be all consumed in competitive mindset, rather than stepping back mentally, and looking at the match as if you were a spectator. That's hard to do. What do you do? Try and keep focused on performing well and winning, or spend some of your thought process on analyzing what's going on off the table? It's distracting to be thinking about the game that's outside of the game on the table if you know what I mean.
I've seen guys lose badly because of that. They weren't being hustled. But they got paranoid thinking they were. They spent more of their brain power watching what their opponent was doing or not doing, than they did focused on the match at hand. Did that guy intentionally dog that shot? Is this leave an intentional two-way shot or was it just a lucky roll?
That's why memory is critical. Need to be able to catalog what a player can and cannot do. If they've been missing certain kinds of position routes due to speed or angle most of the time, but coincidentally hit these certain routes when it really counts, that's a sign. Observe how balls are pocketed? Does this player hit center of pocket, no rails? Can this player decide what side of the pocket to hit? When they are making shots they need to, how well are they being made? Do they look like perfection? If so, they are probably sandbagging. Sometimes players do that and it's a coincidence. But when money is in play, there's only so much coincidence. There's only so much chance, so much luck, so much coincidence - don't forget that. Does he tend to almost always miss to the "pro-side" ? Or how about this...do they shoot for side pockets and tend to miss, but when they get out, they use corner pockets instead for a similar positioned ball? A lot of lower skilled players use the sides which is the wrong shot, but hustlers do that too because it's easier to miss, causes botched positions and the missed ball more often goes somewhere unmakeable, instead of hanging in a pocket.
If you feel it or sense it, get out. Better safe than sorry. Trust your senses. Denial is the worst enemy. Don't make excuses for your opponent. "he got lucky" .."he missed that route or bank 3 times, but got lucky that time" ...no. If you feel you're getting to the table is undeserved, it probably is. Especially if other times, especially when it is a critical rack or situation, getting to the table is tough or when you get there it's miserable. What a coincidence?!? When it counts, you're screwed when coming to the table, when it doesn't count - you get all these easy outs...those are signs.
How the player addresses the CB matters a lot. They can make themselves look sloppy. Look like having a bad stroke, bad form or mechanics. But one thing that doesn't lie...where they hit the CB. That tip WILL hit the CB where they want it to. Even when they are intentionally missing. That is, at least to me, the measure of a skilled player.
Watch their eyes, watch their body language. When they are missing or messing up, do they look like they don't care or they look like they aren't as solid or applying themselves? But when it counts, they are locked in like a pro? I also like to observe the upper body. If the player is running balls and shooting great - are they perfectly steady? But when missing, magically they have serious flaws? Flaws like shoulder/head/upperbody movement? Flaws aren't often intermittent. Meaning, they don't just appear all of a sudden, then just go away for a critical series of shots. A certain level of excellence and skill requires a certain level of concrete solid muscle memory and fundamentals. That shows. If you know how to look for it. A player who has developed that, has to actually force it or work to be sloppy.
In a player's development, skills come in groups. There's no such thing really, as a learning curve. It's more like a learning stairway. A player is at a certain level, picks up a group of skills which then elevates that player to a higher level where they can now execute a group of shots, routes etcetera. If your suspected hustler pulls out shots or routes outside their advertised skill level, at critical times and makes them...beware. Beware also of sucker shots. Often, they don't want to try anything too fancy to get you suspicious. So they'll miss a ball, but the whole art and skill is, they miss the ball in such a way that leaves you bad. Or a sucker shot, where your miss will likely give them an easy shot so they don't have to make it fancy or in a higher skilled way. That's yet another sign, do you find yourself shooting their missed shots in such a way where your odds are low, and it will be a sell out? This happens naturally in a game, but if you feel it's a bit too often - it's no coincidence.
Entire books can be written on the signs of a hustler. This thread already has plenty to start on. But hey, the very very first sign is the most obvious and simple of them all. If that person wants to bet with you - it means they
know they can beat you. That's why it should be an automatic response to demand as much weight as possible when someone asks you for a game. That is a deterrent and helps to frustrate them or at least weaken their position a little bit. That sort of thing gets criticized as "nitty" around here, but who asks for a game from someone they think they are going to lose to? All the trashtalkers and critics are so BRAVE with OTHER people's money. Do they ever share the terms of their bets when it's their money on the line?
It's different when you know the player you're gambling with. If it's someone you've known for a long time and there's hiding of speed, and you're fairly even, then you'd be a nit to always beg for unjustified weight.