If the game is an Omaha-8 or better variant with 4 cards in your hand, here's how I try and figure it out, although I don't play a lot of hi/lo games myself
- Your poker hand(s) is always exactly
2 cards from your hand plus
3 cards from the board.
- (Separate issue, but you can use different cards for your high hand and different cards for your low hand)
- To make a qualifying low hand, you need
5 different ranked cards, eight or lower (there are only 8 different cards: 8,7,6,5,4,3,2,A), among the 2 from your hand and the 3 from the board.
Listed from easiest to figure out to most difficult to figure out is if:
- The board has 3 low cards, 4 low cards, or 5 low cards.
- Your hand has 2 low cards, 3 low cards, or 4 low cards.
look at the board and identify what two hole cards will give you (or your opponent) the nut low. It is not always cut and dry... specifically if there are 4 low cards on the board. Prime example is what was brought up above... yes, your A2 is the nut low on the flop, but if a 2 comes on the turn, A3 becomes the nut low.
^ This. I'll add to first start with the 3 lowest cards on the board.
If it's A23xx on the board:
-then 45 in someone's hand would give the nut low.
-if your hand is A234, then you don't have 5 different cards 8 or lower, because your hand needs 2 low cards different from the three on the board.
If it's A237x on the board:
- then 45 in someone's hand would still give the nut low.
- if your hand is A234, then you DO have a low this time, but it's far from the nut low, as you need to play the 7 on the board. Since you have 3 matching (or counterfeited) cards in your hand to what's on the board, you're playing the 7 on the board, the 4 in your hand, and then 1 more from your hand and 2 more from the board (any combination of A23), so you've got a 7-4-3-2-A, or a 7-4 low.