Hard problems

Classical problem collections, in each book's order. Green is solved, red is tried. Under each number, ✓ counts the players who solved it and ✕ everyone's failed attempts.

Xianji Wuku (1629): Centre

Chapter 1 Problems 286–290

  1. 286
  2. 287
  3. 288
  4. 289
  5. 290

Chapter 2 Problems 291–297

  1. 291
  2. 292
  3. 293
  4. 294
  5. 295
  6. 296
  7. 297

Chapter 3 Problems 298–307

  1. 298
  2. 299
  3. 300
  4. 302
  5. 303
  6. 304
  7. 305
  8. 306
  9. 307

Chapter 4 Problems 328–335

  1. 328
  2. 329
  3. 330
  4. 331
  5. 332
  6. 333
  7. 334
  8. 335