Swiss Pairing: Difference between revisions

Latest revision as of 11:23, 8 March 2026

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

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+== 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.
 {| class="wikitable"
 ! Abbrev.