Placement Strategy (着順)

21.1 Why Placement Matters More Than Points

In competitive riichi mahjong, your final placement (着順, chakujun) determines your reward, not your raw point total. Most ranking systems and tournament formats assign bonuses and penalties based on 1st through 4th place, with the gap between placements being worth far more than marginal point differences within the same placement. A player who finishes 1st with 30,100 points gains the same placement bonus as one who finishes 1st with 60,000 points. This creates a strategic landscape where protecting your position often matters more than maximizing your score.

21.2 Uma and Oka

Uma (ウマ) is the placement bonus/penalty applied after the match. A common uma system is +30/+10/−10/−30 (in thousands), meaning 1st gets +30,000, 2nd gets +10,000, 3rd loses 10,000, and 4th loses 30,000. The gap between 3rd and 4th is therefore 20,000 points worth of placement value.

Oka (オカ) is the bonus for first place derived from the difference between starting points (25,000) and target points (30,000). Each players 5,000 deficit goes to the first-place player (total +20,000 to 1st). The specific uma and oka values vary by platform and ruleset.

21.3 Placement-Aware Decision Making

The key strategic implication: the value of winning or losing a hand depends on how it affects your placement.

In first place: Play conservatively. Fold against threats. A deal-in could drop you to 2nd or worse, losing placement value far greater than any hand you might win. Only push when your lead is so large that even a mangan deal-in would not threaten your placement.

In second place: Balanced play. Attack if it could push you to first. Defend against the leader. Watch out for third and fourth place players who may be aggressive.

In fourth place: Aggressive play. You are already in the worst position; the marginal cost of dealing in is lower (you cant drop below fourth). Push for high-value hands that could move you up. In extreme cases, pursue risky plays that you would never consider if protecting a lead.

21.4 Placement-Aware Adjustments — Specific Thresholds

Nagai Takanori's (長井隆典) 『現代麻雀技術論』(Modern Mahjong Technique Theory) provides one of the most detailed frameworks for placement-adjusted play. Key principles derived from this work and corroborated by Tenhou data analysis:

First place, lead > 10,000: Maximum conservatism. Fold against any threat unless your hand is already tenpai with high value AND a safe discard path exists. The placement value of staying first is worth more than any single hand.

First place, lead < 5,000: Moderate caution. You should still defend more than attack, but a cheap win that maintains your lead is valuable. Dama tenpai preferred over riichi to maintain flexibility.

Fourth place, gap > 15,000: Maximum aggression. You need a significant win (mangan+) to have any chance of climbing. Accept risks you would normally refuse. Open for speed if it enables a quick win. Consider "all-in" riichi on marginal hands because the downside (staying in fourth) is little worse than the current state.

Tight cluster (all players within 5,000): Every hand matters enormously. A single win or deal-in can shift you 2 placements. Play with high precision — neither overly aggressive nor overly defensive. Riichi with good hands, fold against clear threats, and make no unforced errors.

21.5 The Uma Calculation — Why Placement Dominates Points

With standard uma (+30/+10/-10/-30), the placement bonus differences are: 1st→2nd = 20,000 points equivalent. 2nd→3rd = 20,000. 3rd→4th = 20,000. This means dropping one placement costs the equivalent of 20,000 points — roughly 2.5 mangan deal-ins. Conversely, climbing one placement gains 20,000 points equivalent. These numbers, used as the basis for placement-based EV calculations in Kawada Jiro's (川田浩之) analytical framework, show why a player should accept a 5,000-point hand value sacrifice if it increases their probability of maintaining a higher placement by even a moderate amount.