One of the biggest skills in Yu-gi-oh that seperates a good player from a great player is the ability to make a good read. This can come down to reading backrows to reading the strength of an opponent’s hand. I narrow making reads down to categories: reasonable reads and cerebral reads.
Reasonable reads are making assumptions based on the current gamestate. This comes down to how the board develops, what certain outs an opponent may have live, ect.
One of the simplest examples occurs when an opponent has a facedown backrow that goes unused for a long time. Throughout this game, you have not set down a backrow yourself at all. Very clearly, that particular facedown can at most, be reasonably deducted to be an MST.
A not so obvious play: You look at an opponents two backrow. You successfully resolve a Heavy Storm. If you can push for game, will your opponent have Gorz? Probably not, since setting backrow isn’t representative of that kind of hand. Be careful though, since some players (like myself, lol) like to set backrow so that their Gorz isn’t as readable. This happens at higher levels of play though and generally shouldn’t be terribly worth tripping up about.
A more complex read came from a real life situation I encountered. The game state developed in a way where my opponent (playing Tour Guide Zombies, pre-ruling change) committed little resources to the board, setting only monsters every other turn. Because of the way this game was played, I reasoned that he held boss monsters in his hand that weren’t live. I’ve made plays where he would have used Effect Veiler on my monsters if he had it, so I didn’t read that either. I deduced he must have had a BLS in his hand that he wanted to make live. He had ample darks, but no lights. As soon the first light hit the graveyard (which I believe was a Utopia), I flipped my set Mind Crush, calling Black Luster Soldier. I was correct.
These kinds of reads that test your ability to analyze the game state and situation to make a good educated guess on your opponent’s unknowns. This in itself requires an ability to analyze human psychology in a way similar that a poker player does it. Think about it this way: people value psychological tells in poker a lot more than most mediums. Of course, this can definitely be applied to Yu-gi-oh as well.
I think people underestimate the importance of upholding a poker face in Yu-gi-oh. If an opponent has a good read on the strength of their hand, it allows them to be flexible and play accordingly to their read. For example, if they read a weak hand on your part, it allows them to play aggressively and push hard for game.
One of the more common is when a person shows signs of nervousness. Depending on the gamestate, he’s anxious either because he’s scared that you might explode, or he’s excited because he has the proper out to your situation and is waiting for you to run into his Torrent, Mirror Force, or Gorz. For the former, this is largely indicated by checking backrow far too often. This is much akin to a poker player constantly checking their hole cards. However, unlike poker, you only interact with your opponent for 45 minutes, so it’s much easier to tell if he’s genuinely panicking.
At a regional or even the YCS level, humans are more affected by the nervousness that you may think. This holds especially true for a person who has yet to attend a premier event. Unfortunately, these kind of people are the easiest to read. For one, these people are more likely to play more tight because they’re not as willing to gamble their swiss record to make a more optimal play. These kinds of players, you can play more aggressively, even if their comeback cards are live.
(Note that the more inexperienced aggressive players will try to push and gamble their resources on a failed push. Thus when they fail, they won’t have resources for you to read in the first place. From there, you can outplay them most of the time)
Also keep in track of tendencies in players. Some players you’ll run into are talkative that suddenly quiet themselves in the middle of the match. Some players do the hand shuffle and then suddenly don’t. You can tell from these instances that their thinking a lot harder about their players. This usually indicates that their not as confident in their hand. Granted, this kind of lack of confidence can stem from various factors (ranging from having total crap and thinking how to regain control….from a good enough, but not great hand… to having the nuts, but unsure how to play it correctly). The skill comes in reading what kind of factors these are, considering the gamestate. For example, if they’re suddenly thinking hard, and they don’t do much, you can probably reason they have a marginal hand, with potential a live Gorz. This should give you the OK to push, especially if you have outs to Gorz.
Finally, keep in mind what kind of players are readable. Bad conservative players are easy to read. Nervous and anxious players of any skill level are also readable. Bad aggressive players are near impossible to, so it’s best to play you’re best solid game against these kinds of players, though keep in mind that you can’t bluff these players (since they tend to play like Torrent or Mirror don’t exist)