Mahjong Push-Fold & Defense: Learn Folding
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When first learning mahjong, it is natural to be absorbed in advancing your own hand toward a win. However, situations often arise where another player calls riichi and you are unsure what to discard. In mahjong, mastering "push-fold" judgments—deciding whether to attack or defend—along with "defense" techniques to avoid point loss is essential. Learning to completely abandon a win to discard safe tiles ("folding") will greatly reduce unnecessary deal-ins (losses to a ron).
Practicing in games like Jankokushi, where you can play with turn timers disabled (set to off by default) and calmly inspect the opponent's discard pile, is an excellent approach.
Push-Fold Judgment and Criteria for Folding
Pushing aggressively against every riichi dramatically raises your risk of dealing in. Riichi is an offensive move where an opponent in tenpai (1 tile away from a win) with a closed hand places a 1,000-point deposit. Because ura dora may be added, these hands often score high.
Keeping the following benchmarks in mind makes push-fold decisions much clearer:
- When to Push: You are already in tenpai, expecting a high score, or holding a favorable wait.
- When to Fold: You are still far from tenpai (such as two tiles away or further) and would need to discard multiple dangerous tiles.
Catching up when your hand is far behind is difficult, so playing it safe and discarding safe tiles to fold leads to steady play.
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The First Step of Defense: Discarding Genbutsu
Figure 1 as text
Hand: 2m 3m 5m 4p 5p 6p 3s 4s 5s 7s East East East
Draw: 8s
Highlighted tiles: East
Notation: 235m456p3457s111z draw 8s
In this diagram, facing a riichi from the opposite player, the hand holds 3 East tiles. The safest tiles in defense are "genbutsu." Genbutsu refers to tiles that the player who declared riichi has already discarded into their own pond (discard row). Under mahjong rules, the "furiten" rule prevents a player from declaring ron on a tile they have previously discarded, meaning you will not deal in on their genbutsu.
If East has been discarded into that player's pond, discarding your East tiles safely carries you through 3 turns. If no genbutsu is available, look for honor tiles that are safe against all opponents or tiles that another player just discarded safely. Never discard based on unfounded guesses; rely firmly on visible information.
Beginners might hesitate to break up their hands. However, tossing dangerous tiles carelessly against a riichi can cause heavy point losses and dictate the match. Inspect your hand's progress and the discards, and if you cannot keep up, commit thoroughly to defense by discarding genbutsu.
| Rank | Tile Type | Reason |
|---|---|---|
| 1 | Riichi caller's genbutsu | Cannot be called with ron due to furiten rules, making it the most reliable |
| 2 | Honor tiles passed by all players | Cannot form two-sided waits and are often safe against others |
| 3 | Tiles recently passed by another player | Usually safe within the same turn |
Suji Principles and Safety Without Genbutsu
Figure 2 as text
Hand: 1m 1m 5m 3p 4p 5p 8p 2s 3s 4s 6s 7s 8s
Draw: 8p
Highlighted tiles: 1m
Notation: 115m3458p234678s draw 8p
In this diagram, the characters in the hand include 1 of characters. If you lack genbutsu, use "suji" knowledge to identify relatively safe suited tiles. Suji is a defensive principle based on the mechanics of two-sided waits (holding 2 sequential suited tiles waiting on either outer end).
For example, if an opponent discarded 4 of characters, a two-sided wait of 2 of characters and 3 of characters can win on either 1 of characters or 4 of characters. However, because 4 of characters was already discarded, declaring ron on 1 of characters would place them in furiten. Therefore, if they already discarded 4 of characters, 1 of characters cannot deal into a two-sided wait.
Suji combinations for suited tiles divide into 3 systems: 1-4-7, 2-5-8, and 3-6-9. Discarding 4 makes 1 and 7 suji; discarding 5 makes 2 and 8 suji; discarding 6 makes 3 and 9 suji. For outer terminal tiles, discarding 4 makes 1 suji, and discarding 6 makes 9 suji, making them relatively safe since they bypass two-sided waits. Note, however, that suji only rules out two-sided waits; closed waits (middle waits) or single-tile waits can still win on them.
Even when running out of safe tiles, never discard dangerous non-suji tiles carelessly. Selecting safer alternatives like terminal suji tiles is a fundamental defensive skill. When no flawless safe tile exists, consistently minimizing the risk of point loss builds long-term success.
Frequently asked questions
What should I discard when I have no genbutsu?
Start with honor tiles passed by all players, or terminal suji tiles like 1 when 4 is discarded, or 9 when 6 is discarded. Avoiding two-sided waits greatly lowers the risk of dealing in.
Are suji tiles completely safe?
No, they are not completely safe. Suji only prevents two-sided waits, meaning they can still lose to closed waits, single-tile waits, or dual pair waits.
Should I fold even if I am in tenpai?
Consider folding if your wait is poor and your potential score is low. If the risk outweighs the reward against a riichi, stepping back is the right move.
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Why not test your yaku and riichi skills in Jankokushi, a mahjong RPG where you journey toward supremacy alongside historical figures?
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