The two tiles you do not select will become the high hand.
How your choice is judged
First, the trainer checks that your selected low hand does not outrank the other two tiles. If it does, the arrangement is foul. A legal choice is then compared with the split that protects the strongest low hand; if low hands tie, the stronger high hand decides the study match.
This is a transparent balancing exercise, not a claim that every casino would set the hand the same way.
What the scorer recognizes
All 16 pairs in exact rank order
Teen and Day Wongs, Gongs and High Nines
Gee Joon counted as three or six
Point totals and single-tile tie-break rank
Foul low/high arrangements
Fair scoring
When two splits are equal
In 2,872 of the 35,960 possible deals (7.99%), two different splits are exactly equal: the same low hand and the same high hand, tie-break included. The trainer counts either one as a balanced match.
To check a hand from a real table, enter it in the hand calculator. It shows every split side by side.
Play at home
Practise with a physical set
The trainer deals from a complete 32-tile set. To practise the same way at a kitchen table, you need the full set, not a partial domino pack.
Las Vegas Style Pai Gow Tile Set
32 heavy-duty plastic tiles, black with white and red dots
Tiles about 2½ × 1⅛ inches, per the listing
Blue vinyl case with a lid and button snap
All 32 tiles, so every deal the trainer can make is possible at home too.