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): Sides

Chapter 1 Problems 115–121

  1. 115
  2. 116
  3. 117
  4. 118
  5. 119
  6. 120
  7. 121

Chapter 2 Problems 204–225

  1. 204
  2. 205
  3. 207
  4. 208
  5. 209
  6. 210
  7. 211
  8. 212
  9. 213
  10. 214
  11. 215
  12. 216
  13. 217
  14. 218
  15. 219
  16. 220
  17. 221
  18. 222
  19. 223
  20. 224
  21. 225

Chapter 3 Problems 226–259

  1. 226
  2. 227
  3. 228
  4. 229
  5. 230
  6. 231
  7. 232
  8. 233
  9. 235
  10. 236
  11. 237
  12. 239
  13. 240
  14. 241
  15. 242
  16. 243
  17. 244
  18. 245
  19. 246
  20. 247
  21. 248
  22. 249
  23. 250
  24. 251
  25. 252
  26. 253
  27. 254
  28. 255
  29. 256
  30. 257
  31. 258
  32. 259

Chapter 4 Problems 260–269

  1. 260
  2. 261
  3. 262
  4. 263
  5. 264
  6. 265
  7. 266
  8. 267
  9. 268
  10. 269

Chapter 5 Problems 270–274

  1. 270
  2. 271
  3. 272
  4. 273
  5. 274

Chapter 6 Problems 275–277

  1. 275
  2. 276
  3. 277

Chapter 7 Problems 278–285

  1. 278
  2. 280
  3. 281
  4. 282
  5. 283
  6. 284
  7. 285

Chapter 8 Problems 308–312

  1. 308
  2. 309
  3. 310
  4. 311
  5. 312

Chapter 9 Problems 313–317

  1. 313
  2. 314
  3. 315
  4. 316
  5. 317

Chapter 10 Problems 318–320

  1. 318
  2. 319
  3. 320

Chapter 11 Problems 321–323

  1. 321
  2. 322
  3. 323

Chapter 12 Problems 324–327

  1. 324
  2. 325
  3. 326
  4. 327

Chapter 13 Problems 336–337

  1. 336
  2. 337

Chapter 14 Problems 338–344

  1. 338
  2. 339
  3. 340
  4. 341
  5. 342
  6. 343
  7. 344