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 - [x] Chapter 9: Concurrency with Shared Variables
 - [ ] 9.1 Race Conditions
 - [ ] 9.2 Mutual Exclusion: sync.Mutex
- - [ ] 9.3 Read/Write Mutexes: sync.RWMutex
+ - [x] 9.3 Read/Write Mutexes: sync.RWMutex
 - [ ] 9.4 Memory Synchronization
 - [ ] 9.5 Lazy Initialization: sync.Once
 - [ ] 9.6 The Race Detector