# Law 21: Instant Review System (BWF Laws of Badminton)

Badminton · Law 21: Instant Review System · Insporta Book (https://book.insporta.app/badminton/laws/law-21-instant-review-system/)

Challenging line calls with the Instant Review System: what may be challenged, when, how many failed challenges a game allows, and 'No decision'.

## 21.211 Instant Review System

Challenges, results and the umpire's calls.

### Test 1: Challenges with the Instant Review System

- A player or pair may challenge a line judge's call, or a call or overrule by the umpire. (Source: BWF IRS 2023, 1.1)
- The challenge must be made immediately after the player has observed the call. (Source: BWF IRS 2023, 2.1)
- The player must clearly say 'Challenge' to the umpire and/or raise the hand. (Source: BWF ITTO 2025, 5.8.4)
- Challenges are unlimited until two have failed in a game. (Source: BWF IRS 2023, 3.1, 3.3)
- A successful challenge keeps the right to challenge. (Source: BWF IRS 2023, 3.4)
- If the original call was not 'unsighted', it stands; 'No decision' costs no challenge. (Source: BWF ITTO 2025, 5.8.9; BWF IRS 2023, 3.5)
- The umpire calls the Referee, who instructs how to resume play. (Source: BWF IRS 2023, 1.3)
- A successful challenge reverses the original decision. (Source: BWF IRS 2023, 2.1-2.3)
- Only failed challenges count, two to a game. (Source: BWF IRS 2023, 3.1-3.4)
- A successful challenge reverses the call, and the player keeps the right to challenge. (Source: BWF IRS 2023, 2.3, 3.4)

Sources: BWF Laws of Badminton, V6.0 in force 4 January 2027, and BWF Statutes Section 4.1.8 Instant Review System V2.1 (paraphrased in original wording; original questions authored from the Laws, not reproduced)

Take the tests: https://insporta.app/try?utm_source=book&utm_medium=referral