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This tool will help you establish your open range when there are 4 players (including you) at the table. These are the GTO (Game Theory Optimal) opening ranges for different situations (number of antes, cards in hand, position, number of blinds). This tool is especially useful when you don't know the players at the table, which is quite common if you play in a big poker room. The openings will be the best openings you can make by default. You will notice that the results will be color coded. For more information on this color coding, you can check out this page where we break it down in detail.
To find out if you can open your hand or not, fill in the fields and press "Can I open". If you press "Can I open" and nothing happens, you have not filled in a field.
As far as the "First card" and "Second card" sections are concerned, it won't make any difference whether you enter, for example, Q and T or T and Q. One important detail, however, is to indicate whether or not the cards are matched (of the same color). Since matching cards have better long-term equity than non-matching cards, you can open a little wider with matching cards
An example
You are on the final table of a tournament, only 4 players left including yourself, you have 76 big blinds on the cutoff with heart QT. There are currently antes at 10%. Can you open? And what should you do if one of your opponents 3-bets you? To find out the answer, you will obviously use our tool by filling in each section. You will now get your answer:
QTs tells us that the cards match (QTs in hearts). CO tells us that we were in the cutoff position (often written simply as CO). Our stack was 76 BBs, so it was between 75 and 100 BBs. We can open the hand and call a 3-bet from one of our opponents. Sometimes calling a 3-bet will be suggested because our hand is not strong enough to make a 4-bet as is the case here and other times, as will sometimes be the case with some AAs, the 3-bet call will be suggested to incorporate big hands into our "call 3-bet" range. We don't want our opponent to be able to accurately read the range with which we call 3-bets and for that reason we will be concerned about balancing that call range. To give AA's example, when faced with a 3-bet, sometimes we will make a 4-bet since we obviously have the best hand, but other times we will just call the 3-bet in order to underrepresent our hand. Also, if we call 3-bets with both QTs and AAs, we become harder to read.