Swiss Pairing
What the Swiss Tie-Break Labels Mean
OMP — Opponents’ Match Win Percentage
This measures how strong your opponents were, on average.
- For each opponent you played, take their match win percentage (ignoring matches against you).
- Average those percentages.
- Higher OMP means you faced tougher opponents.
- Purpose
If two players have the same record, the one who played stronger opponents ranks higher.
GWP — Game Win Percentage
This measures how well you performed in individual games, not just matches.
- Count all games you won and lost.
- Compute:
- GWP = Games Won / Games Played
- In systems that allow draws, a draw usually counts as half a win.
- Purpose
Rewards players who win their matches more decisively (for example, 2–0 instead of 2–1).
OGP — Opponents’ Game Win Percentage
This is the game-level version of OMP.
- For each opponent, compute their GWP (excluding games against you).
- Average those values.
- Purpose
Provides a finer-grained strength-of-schedule metric. If two players have identical match records and similar OMP, OGP breaks the tie by looking at how strong opponents were within their games.
| Abbrev. | Full name | Measures | What it represents | Why it matters |
|---|---|---|---|---|
| OMP | Opponents’ Match Win Percentage | Opponents’ match results | Strength of schedule (match level) | Primary tie-breaker in many Swiss systems |
| GWP | Game Win Percentage | Your game-by-game results | How decisively you win | Rewards strong performance |
| OGP | Opponents’ Game Win Percentage | Opponents’ game results | Strength of schedule (game level) | Secondary tie-breaker; refines strength of schedule |