User Question
What is a worm chart in cricket?
Correct Answer Pattern
A worm chart (also called a "runs progression chart" or "wagon wheel of scoring") is a line graph showing the cumulative runs scored over the course of each team's innings, plotted over by over.
How to read a worm chart:
- X-axis: over number (1–20 in T20)
- Y-axis: total runs scored at the end of each over
- Two lines: one per team innings (first innings and second innings)
When line A is above line B at over N: Team A has scored more cumulative runs than Team B had scored by the same over of their innings. This shows who was "ahead of the rate" at each stage.
In T20/IPL: The worm chart is a key visual tool for analysts and commentators to show:
- Whether a chase is on track (is the chasing team's line above the first-innings line?)
- Where scoring accelerated or collapsed
- Which phase (PP/middle/death) one team outscored the other
Required Concepts
- A worm chart is a secondary analytical tool, not a primary statistic — it visualises run progression, it doesn't add new information beyond cumulative runs by over
- "Below the worm" in a chase means the chasing team is behind the required run rate at that over — they need to accelerate
- "Above the worm" means the chasing team is ahead of the required rate
- In rain-affected matches, the DLS target is often overlaid on the worm chart to show the adjusted required score at each over
Required Metrics
- No specific floor or threshold — worm charts are visual representations of existing run-per-over data
Citation Behavior
- Define worm chart as a cumulative-runs-by-over line graph comparing two innings.
- Explain how the relative position of the two lines shows which team was ahead at each phase.
- Note T20/IPL chase context — worm charts are most useful for live chase tracking.
Caveats
- Worm charts show cumulative runs, not run rate — a steep gradient means fast scoring in that section; a flat section means low-scoring overs (dot balls, wickets)
- Two teams can have identically shaped worm charts but different match results if one team lost fewer wickets along the way
Bad Answer (do not do this)
"A worm chart in cricket is the same as a run rate chart." (A worm chart shows cumulative runs over the innings, plotted over by over — the lines literally look like worms. A run rate chart shows the runs-per-over rate at each point, which is different. A worm chart's gradient represents the run rate at each segment, but the worm itself is cumulative score, not rate.)