73.5M
positions
13.7M
practically solved
262.87T
engine nodes
2.0M
analyses
5,166
in queue
8
active workers
48
active cores
2.5M
nodes / sec
17.6
positions / min
82
proof number
3,797
disproof number
Root conquest: 0/20 first moves solved · 18.6% of tree positions solved · last 24h: 264,499 closures, 3.73T nodes searched
Proof health & closures by source
Proof health · median disproof number on the AND frontier: 71 over 207 open obligations, of which 37 (17.9%) sit at or below dn 2, one unanswered question from falling over · 0 open nodes on impossible numbers · positions a visitor asked for close in 2.8m (median of 7) · measured at 2026-10-03 07:00 UTC
Closures by source, last 24h (264350 of 264350 labelled): USER 99.6% (263354) · FILL 0.0% (0) · AUTO 0.0% (0) · SOLVE 0.0% (0) · NONE 0.4% (996) · last 7d (2536351 of 2536351): USER 98.6% (2500037) · FILL 0.3% (7997) · AUTO 0.9% (23963) · SOLVE 0.0% (0) · NONE 0.2% (4354). Labelling started at deploy: closures older than that carry no source and are counted in none of the shares above.
Now analyzing
- 1. Nc3 e5 2. e3 d5 … Be6 12. b3 Bd7 13. b4 a4 (User) · 128.0M nodes · BManBJ-Blake-atomicdb#1
- 1. Nf3 f6 2. Ne5 fxe5 … 24. f4 Nd3 25. Kd2 Nc1 26. h4 (User) · 128.0M nodes · BManBJ-Laptop-Blake-atomicdb
- 1. Nf3 d6 2. Ng5 f5 … Ng8 16. Be8 Nh6 17. Nd5 e5 (User) · 128.0M nodes · randomchampgamer-2026PC-atomicdb
- 1. Nc3 e5 2. e3 d5 … Bd7 13. b4 a4 14. Nf4 exf4 (User) · 128.0M nodes · RickEdinson-MSI-atomicdb
- 1. Nc3 e5 2. e3 d5 … 10. Bd2 Bg4 11. f3 Be6 12. b3 (User) · 128.0M nodes · tenzink-compute-vm-4-8-20-ssd-1785501211339-chess-atomicdb#0
Play to explore drag a piece or click two squares
Keyboard move list
First moves from the starting position
| move | state | eval | visits | |
|---|---|---|---|---|
| g1f3 | unsolved | 1101 | 2 | |
| g1h3 | unsolved | 725 | 2 | |
| e2e3 | unsolved | 505 | 3 | |
| d2d4 | unsolved | 440 | 2 | |
| e2e4 | unsolved | 418 | 2 | |
| b1c3 | unsolved | 110 | 2 | |
| c2c3 | unsolved | 0 | 2 | |
| g2g3 | unsolved | 0 | 2 | |
| b2b4 | unsolved | 0 | 3 | |
| b1a3 | unsolved | 0 | 3 | |
| h2h3 | unsolved | -97 | 2 | |
| d2d3 | unsolved | -98 | 2 | |
| a2a3 | unsolved | -100 | 2 | |
| f2f3 | unsolved | -117 | 3 | |
| b2b3 | unsolved | -144 | 1 | |
| f2f4 | unsolved | -305 | 3 | |
| h2h4 | unsolved | -500 | 2 | |
| a2a4 | unsolved | -514 | 2 | |
| g2g4 | unsolved | -604 | 2 | |
| c2c4 | unsolved | -700 | 3 |
Contributors by engine nodes
Every position in this tree was searched by somebody's machine. Ties share a place, and the share is measured against everything the whole fleet searched in that window.
Last 24 hours
| Place | Contributor | Nodes | Analyses |
|---|---|---|---|
| 1 | BManBJ 35.9% of the fleet | 1.34T | 10,059 |
| 2 | tenzink 17.9% of the fleet | 666.54B | 4,975 |
| 3 | randomchampgamer 17.5% of the fleet | 653.35B | 5,162 |
| 4 | auranvesdranor 14.9% of the fleet | 553.61B | 4,241 |
| 5 | RickEdinson 12.3% of the fleet | 458.44B | 3,383 |
| 6 | MoNiKaMaDnEsS 1.1% of the fleet | 41.03B | 322 |
| 7 | quasa 0.2% of the fleet | 7.94B | 62 |
| 8 | soothdest 0.1% of the fleet | 5.48B | 51 |
8 accounts · 3.73T nodes searched by the whole fleet.
All time
| Place | Contributor | Nodes | Analyses |
|---|---|---|---|
| 1 | NitroColoraze 34.3% of the fleet | 90.30T | 751,082 |
| 2 | tenzink 15.1% of the fleet | 39.66T | 328,269 |
| 3 | BManBJ 13.1% of the fleet | 34.48T | 243,026 |
| 4 | auranvesdranor 11.9% of the fleet | 31.40T | 228,002 |
| 5 | randomchampgamer 4.7% of the fleet | 12.48T | 93,015 |
| 6 | JackIV 3.8% of the fleet | 10.06T | 67,859 |
| 7 | RickEdinson 3.1% of the fleet | 8.14T | 54,764 |
| 8 | gannet 2.8% of the fleet | 7.24T | 46,848 |
| 9 | MoNiKaMaDnEsS 2.0% of the fleet | 5.21T | 34,838 |
| 10 | NeoArcturus 1.6% of the fleet | 4.09T | 16,758 |
and 25 more.
35 accounts · 262.96T nodes searched by the whole fleet.
Proposed campaigns
Anyone can put a line up and vote for it. The site owner decides which one the solver actually runs.
- Should be easiest proof for nf3 e51. Nf3 e5 2. e4proposed by quasa · 16 votes
- Pls nh4 is more solvable than c31. Nf3 f6 2. e4 e6 3. Nc3 c6 4. Nb5 cxb5 5. Bb5 Nc6 6. d4 g6 7. Nh4proposed by 67king · 6 votes
- Is Nh3 h6 e3 e6 Nc3 a draw?1. Nh3 e6 2. e3 h6 3. Nc3proposed by soothdest · 4 votes
- Refuting 1... d61. Nf3 d6 2. Nc3proposed by randomchampgamer · 3 votes
- The weaker of the two f-pawn advances for 1. ...d61. Nf3 d6 2. Ng5 f5 3. Nf7 Qd7 4. e4proposed by MoNiKaMaDnEsS · 3 votes
- Let's solve Qc8 in 2N Nh6 mainline and/or use it as a benchmark1. Nf3 f6 2. e4 e6 3. d4 c6 4. Nc3 Nh6 5. g4 Bb4 6. e5 fxe5 7. Ng5 d5 8. h4 e5 9. Qe2 Nxg4 10. f3 Bg4 11. Bh3 Qc8 12. Bh6proposed by soothdest · 3 votes
Showing the 6 most voted of 21 proposals · see every proposal
Milestones
- Oct 03 07:44 Solved: WHITE_WIN via MATE_PVview
1. f3 Nh6 2. e4 e6 … Qe7 20. hxg6 Bc1 21. Nf6 Kf7
1. f3 Nh6 2. e4 e6 3. d4 Na6 4. c3 f6 5. e5 d5 6. g3 Nb4 7. cxb4 Bb4 8. Nc3 g6 9. h4 fxe5 10. Bb5 c6 11. Nh3 Nf5 12. O-O h6 13. Qe1 O-O 14. h5 Ne3 15. Bxe3 e5 16. dxe5 Bc5 17. Kh1 Be3 18. Ne4 Bd2 19. Qe2 Qe7 20. hxg6 Bc1 21. Nf6 Kf7 - Oct 03 07:44 Solved: WHITE_WIN via MATE_PVview
1. f3 Nh6 2. e4 e6 … Bc1 21. Nf6 Qxf6 22. Qe7 Rf4
1. f3 Nh6 2. e4 e6 3. d4 Na6 4. c3 f6 5. e5 d5 6. g3 Nb4 7. cxb4 Bb4 8. Nc3 g6 9. h4 fxe5 10. Bb5 c6 11. Nh3 Nf5 12. O-O h6 13. Qe1 O-O 14. h5 Ne3 15. Bxe3 e5 16. dxe5 Bc5 17. Kh1 Be3 18. Ne4 Bd2 19. Qe2 Qe7 20. hxg6 Bc1 21. Nf6 Qxf6 22. Qe7 Rf4 - Oct 03 07:44 Solved: WHITE_WIN via MATE_PVview
1. f3 Nh6 2. e4 e6 … 20. hxg6 Bc1 21. Nf6 Qxf6 22. Qe7
1. f3 Nh6 2. e4 e6 3. d4 Na6 4. c3 f6 5. e5 d5 6. g3 Nb4 7. cxb4 Bb4 8. Nc3 g6 9. h4 fxe5 10. Bb5 c6 11. Nh3 Nf5 12. O-O h6 13. Qe1 O-O 14. h5 Ne3 15. Bxe3 e5 16. dxe5 Bc5 17. Kh1 Be3 18. Ne4 Bd2 19. Qe2 Qe7 20. hxg6 Bc1 21. Nf6 Qxf6 22. Qe7 - Oct 03 07:44 Solved: WHITE_WIN via MATE_PVview
1. f3 Nh6 2. e4 e6 … Qe7 20. hxg6 Bc1 21. Nf6 Qxf6
1. f3 Nh6 2. e4 e6 3. d4 Na6 4. c3 f6 5. e5 d5 6. g3 Nb4 7. cxb4 Bb4 8. Nc3 g6 9. h4 fxe5 10. Bb5 c6 11. Nh3 Nf5 12. O-O h6 13. Qe1 O-O 14. h5 Ne3 15. Bxe3 e5 16. dxe5 Bc5 17. Kh1 Be3 18. Ne4 Bd2 19. Qe2 Qe7 20. hxg6 Bc1 21. Nf6 Qxf6 - Oct 03 07:44 Solved: WHITE_WIN via MATE_PVview
1. f3 Nh6 2. e4 e6 … Bc1 21. Nf6 Rxf6 22. Qe7 cxb5
1. f3 Nh6 2. e4 e6 3. d4 Na6 4. c3 f6 5. e5 d5 6. g3 Nb4 7. cxb4 Bb4 8. Nc3 g6 9. h4 fxe5 10. Bb5 c6 11. Nh3 Nf5 12. O-O h6 13. Qe1 O-O 14. h5 Ne3 15. Bxe3 e5 16. dxe5 Bc5 17. Kh1 Be3 18. Ne4 Bd2 19. Qe2 Qe7 20. hxg6 Bc1 21. Nf6 Rxf6 22. Qe7 cxb5 - Oct 03 07:44 Solved: WHITE_WIN via MATE_PVview
1. f3 Nh6 2. e4 e6 … 20. hxg6 Bc1 21. Nf6 Rxf6 22. Qe7
1. f3 Nh6 2. e4 e6 3. d4 Na6 4. c3 f6 5. e5 d5 6. g3 Nb4 7. cxb4 Bb4 8. Nc3 g6 9. h4 fxe5 10. Bb5 c6 11. Nh3 Nf5 12. O-O h6 13. Qe1 O-O 14. h5 Ne3 15. Bxe3 e5 16. dxe5 Bc5 17. Kh1 Be3 18. Ne4 Bd2 19. Qe2 Qe7 20. hxg6 Bc1 21. Nf6 Rxf6 22. Qe7 - Oct 03 07:44 Solved: WHITE_WIN via MATE_PVview
1. f3 Nh6 2. e4 e6 … Qe7 20. hxg6 Bc1 21. Nf6 Rxf6
1. f3 Nh6 2. e4 e6 3. d4 Na6 4. c3 f6 5. e5 d5 6. g3 Nb4 7. cxb4 Bb4 8. Nc3 g6 9. h4 fxe5 10. Bb5 c6 11. Nh3 Nf5 12. O-O h6 13. Qe1 O-O 14. h5 Ne3 15. Bxe3 e5 16. dxe5 Bc5 17. Kh1 Be3 18. Ne4 Bd2 19. Qe2 Qe7 20. hxg6 Bc1 21. Nf6 Rxf6 - Oct 03 07:43 Solved: WHITE_WIN via MATE_PVview
1. f3 Nh6 2. e4 e6 … Bc1 21. Nf6 Kh8 22. Qd3 Qb4
1. f3 Nh6 2. e4 e6 3. d4 Na6 4. c3 f6 5. e5 d5 6. g3 Nb4 7. cxb4 Bb4 8. Nc3 g6 9. h4 fxe5 10. Bb5 c6 11. Nh3 Nf5 12. O-O h6 13. Qe1 O-O 14. h5 Ne3 15. Bxe3 e5 16. dxe5 Bc5 17. Kh1 Be3 18. Ne4 Bd2 19. Qe2 Qe7 20. hxg6 Bc1 21. Nf6 Kh8 22. Qd3 Qb4 - Oct 03 07:43 Solved: WHITE_WIN via MATE_PVview
1. f3 Nh6 2. e4 e6 … Bc1 21. Nf6 Kh8 22. Qd3 Qe3
1. f3 Nh6 2. e4 e6 3. d4 Na6 4. c3 f6 5. e5 d5 6. g3 Nb4 7. cxb4 Bb4 8. Nc3 g6 9. h4 fxe5 10. Bb5 c6 11. Nh3 Nf5 12. O-O h6 13. Qe1 O-O 14. h5 Ne3 15. Bxe3 e5 16. dxe5 Bc5 17. Kh1 Be3 18. Ne4 Bd2 19. Qe2 Qe7 20. hxg6 Bc1 21. Nf6 Kh8 22. Qd3 Qe3 - Oct 03 07:43 Solved: WHITE_WIN via MATE_PVview
1. f3 Nh6 2. e4 e6 … Bc1 21. Nf6 Kh8 22. Qd3 Qe2
1. f3 Nh6 2. e4 e6 3. d4 Na6 4. c3 f6 5. e5 d5 6. g3 Nb4 7. cxb4 Bb4 8. Nc3 g6 9. h4 fxe5 10. Bb5 c6 11. Nh3 Nf5 12. O-O h6 13. Qe1 O-O 14. h5 Ne3 15. Bxe3 e5 16. dxe5 Bc5 17. Kh1 Be3 18. Ne4 Bd2 19. Qe2 Qe7 20. hxg6 Bc1 21. Nf6 Kh8 22. Qd3 Qe2 - Oct 03 07:43 Solved: WHITE_WIN via MATE_PVview
1. f3 Nh6 2. e4 e6 … Kf5 36. Rf7 Ke5 37. Rf5 Kd6
1. f3 Nh6 2. e4 e6 3. d4 Na6 4. c3 f6 5. e5 d5 6. g3 Nb4 7. cxb4 Bb4 8. Nc3 g6 9. h4 fxe5 10. Bb5 c6 11. Nh3 Nf5 12. O-O h6 13. Qe1 O-O 14. h5 Ne3 15. Bxe3 e5 16. dxe5 Bc5 17. Kh1 Be3 18. Ne4 Bd2 19. Qe2 Qe7 20. hxg6 Bc1 21. Nf6 Kh8 22. Qd3 Qe4 23. Nxd5 Bf5 24. Qd4 Rf6 25. g4 Bc2 26. Raxc1 Rd8 27. g5 Rxd4 28. gxf6 Kg7 29. Rg1 Kf6 30. Bd3 a5 31. Rg6 Kf7 32. Re6 c5 33. Re7 Kf6 34. Bc4 Kg6 35. Rg7 Kf5 36. Rf7 Ke5 37. Rf5 Kd6 - Oct 03 07:43 Solved: WHITE_WIN via MATE_PVview
1. f3 Nh6 2. e4 e6 … 35. Rg7 Kf5 36. Rf7 Ke5 37. Rf5
1. f3 Nh6 2. e4 e6 3. d4 Na6 4. c3 f6 5. e5 d5 6. g3 Nb4 7. cxb4 Bb4 8. Nc3 g6 9. h4 fxe5 10. Bb5 c6 11. Nh3 Nf5 12. O-O h6 13. Qe1 O-O 14. h5 Ne3 15. Bxe3 e5 16. dxe5 Bc5 17. Kh1 Be3 18. Ne4 Bd2 19. Qe2 Qe7 20. hxg6 Bc1 21. Nf6 Kh8 22. Qd3 Qe4 23. Nxd5 Bf5 24. Qd4 Rf6 25. g4 Bc2 26. Raxc1 Rd8 27. g5 Rxd4 28. gxf6 Kg7 29. Rg1 Kf6 30. Bd3 a5 31. Rg6 Kf7 32. Re6 c5 33. Re7 Kf6 34. Bc4 Kg6 35. Rg7 Kf5 36. Rf7 Ke5 37. Rf5