The Third Umpire in Cricket: Technology, Role, and How On-Field Decisions Are Reviewed
How the third umpire system works in cricket — the technology used, what decisions can be referred, the process of an on-field referral versus DRS, and how the third umpire's role has expanded over time.
The third umpire — an additional umpire positioned off the field with access to television replays and technology — was first introduced in 1992 in the South Africa vs India Test series in Durban. Initially limited to run-out decisions, the role has expanded significantly: the third umpire now adjudicates on catches, boundaries, stumpings, obstructions, and all DRS reviews. The third umpire system is the mechanism through which technology is incorporated into cricket's decision-making.
Third Umpire vs DRS: Two Different Systems
There are two distinct ways a decision reaches the third umpire. First, an on-field referral: the on-field umpire is uncertain and directly refers a decision to the third umpire — for run-outs, stumpings, boundary catches, and similar decisions. The third umpire reviews footage and gives the verdict. Second, a DRS review: a fielding or batting team uses one of their DRS reviews to challenge an on-field umpire's decision. The on-field umpire's decision stands unless the technology clearly overturns it. The player-initiated DRS review preserves the on-field decision in marginal cases (Umpire's Call); the on-field referral is simply asking the third umpire to make the decision instead.
The Soft Signal Controversy and Its Removal
The 'soft signal' — where the on-field umpire gives a preliminary verdict before referring to the third umpire — was a source of significant controversy until its abolition in 2022. Under the soft signal system, if the on-field umpire signalled 'out' (soft signal out), the third umpire needed conclusive evidence to overturn it to not out, and vice versa. Critics argued this compounded the Umpire's Call problem: a marginal catch that was 'Umpire's Call' (inconclusive technology) would stand as out if the soft signal was out, and stand as not out if the soft signal was not out — the same inconclusive evidence producing different outcomes based on the preliminary signal. The ICC removed the soft signal requirement in 2022, instructing on-field umpires to simply refer without a preliminary verdict and letting the third umpire make the call.
Frequently asked questions
How accurate is the third umpire's technology in different decision types, and are there systematic biases in which decisions technology gets right vs wrong?
Third umpire technology accuracy varies significantly by decision type, and there are genuine systematic limitations in specific areas. Run-out accuracy: very high. Frame-by-frame video with multiple camera angles can place the bat or foot position relative to the crease line with sub-millimetre precision. The remaining uncertainty is about bat/foot lift — whether the bat or foot that appears to be in contact with the ground is actually touching it vs hovering over it millimetres above. Slow-motion compression artefacts can create apparent contact where none exists; this is rare but not zero. Stumping accuracy: very high for crease position, moderate for timing. The same frame-by-frame analysis that works for run-outs applies. The additional complexity in stumpings is whether the wicketkeeper's glove removed the bail with the ball in hand, vs after the ball was dropped momentarily — this is usually clear but occasionally ambiguous. Catch (ground) decisions: moderate accuracy. Hawk-Eye's ball-tracking and camera angles can usually determine whether the ball grounded, but some catches taken at grass level with cameras not perfectly perpendicular are ambiguous. The 'doubtful' outcome in third umpire catch reviews is used more frequently than in other decision types. LBW trajectory: moderate accuracy with known limitations. The ball-tracking model predicts post-pad-impact trajectory based on pre-impact movement. For straight balls, this is reliable. For late-swinging or turning deliveries, the prediction is less reliable because the model doesn't fully account for post-impact deflection physics. Edge detection (UltraEdge): moderate accuracy, context-dependent. True edges produce clear spikes; near-misses by a fraction of a millimetre may produce no signal or ambiguous low spikes. False positives (bat hitting ground, bat on pad) are real. Systematic biases: technology systematically favours run-out and stumping accuracy over LBW prediction accuracy. Subcontinental pitches (more turning deliveries) may show more LBW prediction error than pace-friendly pitches. Third umpire decisions are most reliable for binary physical events (bat in or out of crease) and least reliable for trajectory predictions.