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Last updated 31 Oct 2026

Puzzles

Every figure is counted from the puzzle platform’s own records — the library, each solver’s running totals, and the attempt log. Nothing is projected and nothing is smoothed. A theme needs twenty attempts before it appears on a solve-rate chart, so one bad afternoon cannot name the hardest idea in chess.

Puzzles

33,298

Solvers

115

Attempts

5,265

Solved

4,831

Solve rate

91.8%

of finished attempts

Accuracy

65.7%

moves played that were the move

Average solve

47.2s

over solved, timed attempts

Strongest solver

2,563

puzzle rating

Activity

Attempts finished per day, over the last 30 days.

408 in the window
0601203 Oct: 264 Oct: 685 Oct: 36 Oct: 07 Oct: 218 Oct: 09 Oct: 010 Oct: 011 Oct: 10412 Oct: 1513 Oct: 3914 Oct: 215 Oct: 016 Oct: 017 Oct: 1018 Oct: 1019 Oct: 020 Oct: 021 Oct: 5622 Oct: 023 Oct: 024 Oct: 3325 Oct: 726 Oct: 027 Oct: 1028 Oct: 029 Oct: 030 Oct: 031 Oct: 41 Nov: 03 Oct8 Oct13 Oct18 Oct23 Oct28 Oct1 Nov
Puzzle attempts finished per day, over the last thirty days

Library by difficulty

What there is to solve, by tier.

10,914
5,207
5,192
4,171
2,814
5,000
Beginner
Easy
Intermediate
Hard
Expert
Master
Puzzles in the library by difficulty tier. Beginner: 10,914; Easy: 5,207; Intermediate: 5,192; Hard: 4,171; Expert: 2,814; Master: 5,000.

How attempts end

Every finished attempt, across the platform.

Solved first time: 2273Solved after a mistake: 2558Not solved: 434
5,265attempts
  • Solved first time2,27343.2%
  • Solved after a mistake2,55848.6%
  • Not solved4348.2%

Library rating spread

Puzzles by rating band, in 200-point steps.

3,921
4,208
3,487
3,539
3,373
2,921
2,358
1,706
2,706
1,987
800100012001400160018002000220024002600
Puzzles by rating band. 800: 3,921; 1000: 4,208; 1200: 3,487; 1400: 3,539; 1600: 3,373; 1800: 2,921; 2000: 2,358; 2200: 1,706; 2400: 2,706; 2600: 1,987.

Solver rating spread

Solvers on the same 200-point steps. Everyone starts at 1200.

0
3
8
15
26
23
23
10
7
0
800100012001400160018002000220024002600
Solvers by puzzle rating band. 800: 0; 1000: 3; 1200: 8; 1400: 15; 1600: 26; 1800: 23; 2000: 23; 2200: 10; 2400: 7; 2600: 0.

Hardest ideas

Lowest solve rate, over themes met at least twenty times.

  1. Pillsburys mate74%
  2. Attacking f2 or f784%
  3. Double check85%
  4. Clearance87%
  5. Discovered check87%
  6. Sacrifice89%
  7. Discovered attack89%
  8. Very long90%
  9. Quiet move90%
  10. Fork90%
  11. Advantage90%
  12. Middlegame90%

Easiest ideas

Highest solve rate, on the same floor.

  1. Kill box mate100%
  2. Pawn endgame99%
  3. Capturing the defender98%
  4. Knight endgame97%
  5. Hanging piece97%
  6. Zugzwang97%
  7. Mate in one97%
  8. One move97%
  9. Equality96%
  10. Mate in five96%
  11. Zwischenzug96%
  12. Interference96%

Most-met ideas

Tactical themes by how many attempts they have taken.

  1. Crushing2,740
  2. Endgame2,588
  3. Middlegame2,475
  4. Long2,091
  5. Short2,009
  6. Advantage1,877
  7. Very long1,029
  8. Master game833
  9. Sacrifice665
  10. Defensive move644
  11. Checkmate573
  12. Fork542

Federations

Where the solvers are, by how many of them there are.

Puzzle solvers by federation
#FederationSolversSolvedBest
1ZIM613,0532,563
2ZAM133242,130
3SSD127612,494
4BOT101962,131
5RSA61432,236
6KEN4462,004
7SLE31622,210
8NGR3381,834
9GEQ1352,113
10EGY1681,848
11UGA151,691

Measured 1 Nov 2026, 10:12 UTC.