64.6M
positions
11.5M
practically solved
231.57T
engine nodes
1.8M
analyses
2,110
in queue
9
active workers
48
active cores
7.8M
nodes / sec
16.2
positions / min
125
proof number
3,777
disproof number
Root conquest: 0/20 first moves solved · 17.8% of tree positions solved · last 24h: 346,055 closures, 4.93T nodes searched
Proof health & closures by source
Proof health · median disproof number on the AND frontier: 81 over 191 open obligations, of which 30 (15.7%) 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 8.0h (median of 139) · measured at 2026-09-27 12:00 UTC
Closures by source, last 24h (346055 of 346055 labelled): USER 91.4% (316389) · FILL 2.2% (7655) · AUTO 6.2% (21287) · SOLVE 0.0% (0) · NONE 0.2% (724) · last 7d (1296663 of 1296663): USER 96.7% (1253953) · FILL 0.7% (8795) · AUTO 2.5% (32065) · SOLVE 0.0% (0) · NONE 0.1% (1850). Labelling started at deploy: closures older than that carry no source and are counted in none of the shares above.
Now analyzing
- 1. Nh3 e6 2. e3 g6 … 15. g4 Nf7 16. a3 c5 17. Rb1 (User) · 128.0M nodes · auranvesdranor-pop-os-atomicdb
- 1. Nf3 d6 2. Ng5 f6 … Rc6 15. Bb2 d4 16. Qa4 Bd6 (User) · 128.0M nodes · BManBJ-Blake-atomicdb
- 1. Nf3 f6 2. e4 e6 … 20. Rh1 d6 21. exd6 Kf7 22. Bc4 (User) · 128.0M nodes · BManBJ-Blake-atomicdb#1
- 1. Nh3 f5 2. d4 h6 3. Ng5 e5 4. e3 e4 (User) · 10.00B nodes · BManBJ-Blake-atomicdb#2
- 1. Nf3 f6 2. e4 e6 … d6 21. g4 Kf8 22. exd6 Kg7 (User) · 128.0M nodes · BManBJ-Laptop-Blake-atomicdb
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 | 817 | 2 | |
| g1h3 | unsolved | 650 | 2 | |
| e2e3 | unsolved | 505 | 3 | |
| d2d4 | unsolved | 435 | 2 | |
| e2e4 | unsolved | 417 | 2 | |
| b1c3 | unsolved | 183 | 2 | |
| c2c3 | unsolved | 19 | 2 | |
| g2g3 | unsolved | 0 | 2 | |
| b2b4 | unsolved | 0 | 3 | |
| b1a3 | unsolved | 0 | 3 | |
| h2h3 | unsolved | -100 | 2 | |
| a2a3 | unsolved | -103 | 2 | |
| f2f3 | unsolved | -110 | 2 | |
| d2d3 | unsolved | -116 | 2 | |
| b2b3 | unsolved | -119 | 1 | |
| f2f4 | unsolved | -301 | 3 | |
| h2h4 | unsolved | -500 | 2 | |
| a2a4 | unsolved | -502 | 2 | |
| g2g4 | unsolved | -600 | 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 | NitroColoraze 37.9% of the fleet | 1.87T | 11,239 |
| 2 | BManBJ 19.9% of the fleet | 981.40B | 6,681 |
| 3 | auranvesdranor 16.5% of the fleet | 812.68B | 4,978 |
| 4 | tenzink 11.7% of the fleet | 578.36B | 3,397 |
| 5 | randomchampgamer 9.9% of the fleet | 486.91B | 3,559 |
| 6 | MoNiKaMaDnEsS 3.6% of the fleet | 179.59B | 1,297 |
| 7 | soothdest 0.3% of the fleet | 15.98B | 122 |
| 8 | RandomMatrix 0.2% of the fleet | 10.11B | 76 |
| 9 | bricerichmond <0.1% of the fleet | 700.3M | 6 |
9 accounts · 4.94T nodes searched by the whole fleet.
All time
| Place | Contributor | Nodes | Analyses |
|---|---|---|---|
| 1 | NitroColoraze 39.0% of the fleet | 90.30T | 751,082 |
| 2 | tenzink 15.6% of the fleet | 36.19T | 303,925 |
| 3 | BManBJ 11.3% of the fleet | 26.21T | 179,861 |
| 4 | auranvesdranor 11.2% of the fleet | 25.95T | 186,513 |
| 5 | JackIV 4.3% of the fleet | 10.06T | 67,859 |
| 6 | randomchampgamer 3.9% of the fleet | 8.97T | 65,064 |
| 7 | RickEdinson 2.8% of the fleet | 6.50T | 43,070 |
| 8 | MoNiKaMaDnEsS 1.8% of the fleet | 4.14T | 26,565 |
| 9 | NeoArcturus 1.8% of the fleet | 4.09T | 16,756 |
| 10 | ijh 1.5% of the fleet | 3.57T | 37,348 |
and 23 more.
33 accounts · 231.70T 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
- 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
- Is Nh3 h6 e3 e6 Nc3 a draw?1. Nh3 e6 2. e3 h6 3. Nc3proposed by soothdest · 3 votes
Showing the 6 most voted of 21 proposals · see every proposal
Milestones
- Sep 27 13:06 Solved: WHITE_WIN via MINIMAXview
1. Nf3 f6 2. Nc3 d6 … Rc6 15. Bb2 d4 16. Qa4 dxe3
1. Nf3 f6 2. Nc3 d6 3. Nb5 e6 4. Ng5 h6 5. Nh7 Rxh7 6. Nxc7 Be7 7. e3 d5 8. Qg4 g6 9. Qa4 b5 10. Qa6 Rc8 11. b3 Rc6 12. Ba3 b4 13. Qb7 Rc7 14. Qb5 Rc6 15. Bb2 d4 16. Qa4 dxe3 - Sep 27 13:06 Solved: WHITE_WIN via MATE_PVview
1. Nf3 f6 2. Nc3 d6 … g5 21. Bxc6 Kf7 22. Qe8 Kg7
1. Nf3 f6 2. Nc3 d6 3. Nb5 e6 4. Ng5 h6 5. Nh7 Rxh7 6. Nxc7 Be7 7. e3 d5 8. Qg4 g6 9. Qa4 b5 10. Qa6 Rc8 11. b3 Rc6 12. Ba3 b4 13. Qb7 Rc7 14. Qb5 Rc6 15. Bb2 d4 16. Qa4 dxe3 17. Ba6 Bd6 18. Be5 Bc5 19. d4 Bxd4 20. Bb5 g5 21. Bxc6 Kf7 22. Qe8 Kg7 - Sep 27 13:06 Solved: WHITE_WIN via MATE_PVview
1. Nf3 f6 2. Nc3 d6 … 20. Bb5 g5 21. Bxc6 Kf7 22. Qe8
1. Nf3 f6 2. Nc3 d6 3. Nb5 e6 4. Ng5 h6 5. Nh7 Rxh7 6. Nxc7 Be7 7. e3 d5 8. Qg4 g6 9. Qa4 b5 10. Qa6 Rc8 11. b3 Rc6 12. Ba3 b4 13. Qb7 Rc7 14. Qb5 Rc6 15. Bb2 d4 16. Qa4 dxe3 17. Ba6 Bd6 18. Be5 Bc5 19. d4 Bxd4 20. Bb5 g5 21. Bxc6 Kf7 22. Qe8 - Sep 27 13:06 Solved: WHITE_WIN via MATE_PVview
1. Nf3 f6 2. Nc3 d6 … Bxd4 20. Bb5 g5 21. Bxc6 Kf7
1. Nf3 f6 2. Nc3 d6 3. Nb5 e6 4. Ng5 h6 5. Nh7 Rxh7 6. Nxc7 Be7 7. e3 d5 8. Qg4 g6 9. Qa4 b5 10. Qa6 Rc8 11. b3 Rc6 12. Ba3 b4 13. Qb7 Rc7 14. Qb5 Rc6 15. Bb2 d4 16. Qa4 dxe3 17. Ba6 Bd6 18. Be5 Bc5 19. d4 Bxd4 20. Bb5 g5 21. Bxc6 Kf7 - Sep 27 13:06 Solved: WHITE_WIN via MATE_PVview
1. Nf3 f6 2. Nc3 d6 … 19. d4 Bxd4 20. Bb5 g5 21. Bxc6
1. Nf3 f6 2. Nc3 d6 3. Nb5 e6 4. Ng5 h6 5. Nh7 Rxh7 6. Nxc7 Be7 7. e3 d5 8. Qg4 g6 9. Qa4 b5 10. Qa6 Rc8 11. b3 Rc6 12. Ba3 b4 13. Qb7 Rc7 14. Qb5 Rc6 15. Bb2 d4 16. Qa4 dxe3 17. Ba6 Bd6 18. Be5 Bc5 19. d4 Bxd4 20. Bb5 g5 21. Bxc6 - Sep 27 13:06 Solved: WHITE_WIN via MATE_PVview
1. Nf3 f6 2. Nc3 d6 … Bc5 19. d4 Bxd4 20. Bb5 g5
1. Nf3 f6 2. Nc3 d6 3. Nb5 e6 4. Ng5 h6 5. Nh7 Rxh7 6. Nxc7 Be7 7. e3 d5 8. Qg4 g6 9. Qa4 b5 10. Qa6 Rc8 11. b3 Rc6 12. Ba3 b4 13. Qb7 Rc7 14. Qb5 Rc6 15. Bb2 d4 16. Qa4 dxe3 17. Ba6 Bd6 18. Be5 Bc5 19. d4 Bxd4 20. Bb5 g5 - Sep 27 13:06 Solved: WHITE_WIN via MATE_PVview
1. Nf3 f6 2. Nc3 d6 … 18. Be5 Bc5 19. d4 Bxd4 20. Bb5
1. Nf3 f6 2. Nc3 d6 3. Nb5 e6 4. Ng5 h6 5. Nh7 Rxh7 6. Nxc7 Be7 7. e3 d5 8. Qg4 g6 9. Qa4 b5 10. Qa6 Rc8 11. b3 Rc6 12. Ba3 b4 13. Qb7 Rc7 14. Qb5 Rc6 15. Bb2 d4 16. Qa4 dxe3 17. Ba6 Bd6 18. Be5 Bc5 19. d4 Bxd4 20. Bb5 - Sep 27 13:06 Solved: WHITE_WIN via MATE_PVview
1. Nf3 f6 2. Nc3 d6 … Bd6 18. Be5 Bc5 19. d4 Bxd4
1. Nf3 f6 2. Nc3 d6 3. Nb5 e6 4. Ng5 h6 5. Nh7 Rxh7 6. Nxc7 Be7 7. e3 d5 8. Qg4 g6 9. Qa4 b5 10. Qa6 Rc8 11. b3 Rc6 12. Ba3 b4 13. Qb7 Rc7 14. Qb5 Rc6 15. Bb2 d4 16. Qa4 dxe3 17. Ba6 Bd6 18. Be5 Bc5 19. d4 Bxd4 - Sep 27 13:06 Solved: WHITE_WIN via MATE_PVview
1. Nf3 f6 2. Nc3 d6 … 17. Ba6 Bd6 18. Be5 Bc5 19. d4
1. Nf3 f6 2. Nc3 d6 3. Nb5 e6 4. Ng5 h6 5. Nh7 Rxh7 6. Nxc7 Be7 7. e3 d5 8. Qg4 g6 9. Qa4 b5 10. Qa6 Rc8 11. b3 Rc6 12. Ba3 b4 13. Qb7 Rc7 14. Qb5 Rc6 15. Bb2 d4 16. Qa4 dxe3 17. Ba6 Bd6 18. Be5 Bc5 19. d4 - Sep 27 13:06 Solved: WHITE_WIN via MATE_PVview
1. Nf3 f6 2. Nc3 d6 … dxe3 17. Ba6 Bd6 18. Be5 Bc5
1. Nf3 f6 2. Nc3 d6 3. Nb5 e6 4. Ng5 h6 5. Nh7 Rxh7 6. Nxc7 Be7 7. e3 d5 8. Qg4 g6 9. Qa4 b5 10. Qa6 Rc8 11. b3 Rc6 12. Ba3 b4 13. Qb7 Rc7 14. Qb5 Rc6 15. Bb2 d4 16. Qa4 dxe3 17. Ba6 Bd6 18. Be5 Bc5 - Sep 27 13:06 Solved: WHITE_WIN via MATE_PVview
1. Nf3 f6 2. Nc3 d6 … 16. Qa4 dxe3 17. Ba6 Bd6 18. Be5
1. Nf3 f6 2. Nc3 d6 3. Nb5 e6 4. Ng5 h6 5. Nh7 Rxh7 6. Nxc7 Be7 7. e3 d5 8. Qg4 g6 9. Qa4 b5 10. Qa6 Rc8 11. b3 Rc6 12. Ba3 b4 13. Qb7 Rc7 14. Qb5 Rc6 15. Bb2 d4 16. Qa4 dxe3 17. Ba6 Bd6 18. Be5 - Sep 27 13:06 Solved: WHITE_WIN via MATE_PVview
1. Nf3 f6 2. Nc3 d6 … d4 16. Qa4 dxe3 17. Ba6 Bd6
1. Nf3 f6 2. Nc3 d6 3. Nb5 e6 4. Ng5 h6 5. Nh7 Rxh7 6. Nxc7 Be7 7. e3 d5 8. Qg4 g6 9. Qa4 b5 10. Qa6 Rc8 11. b3 Rc6 12. Ba3 b4 13. Qb7 Rc7 14. Qb5 Rc6 15. Bb2 d4 16. Qa4 dxe3 17. Ba6 Bd6