64.0M
positions
11.3M
practically solved
230.41T
engine nodes
1.8M
analyses
8,277
in queue
9
active workers
60
active cores
11.5M
nodes / sec
16.3
positions / min
125
proof number
3,794
disproof number
Root conquest: 0/20 first moves solved · 17.7% of tree positions solved · last 24h: 477,604 closures, 6.18T nodes searched
Proof health & closures by source
Proof health · median disproof number on the AND frontier: 81 over 188 open obligations, of which 30 (16.0%) 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 11.7h (median of 153) · measured at 2026-09-27 04:00 UTC
Closures by source, last 24h (477593 of 477593 labelled): USER 92.4% (441186) · FILL 1.8% (8452) · AUTO 5.6% (26873) · SOLVE 0.0% (0) · NONE 0.2% (1082) · last 7d (1254764 of 1254827): USER 96.6% (1211902) · FILL 0.7% (8795) · AUTO 2.6% (32065) · SOLVE 0.0% (0) · NONE 0.2% (2002). Labelling started at deploy: closures older than that carry no source and are counted in none of the shares above.
Now analyzing
- 1. Nf3 f6 2. Na3 Nh6 3. h3 Ng4 4. hxg4 b5 (User) · 512.0M nodes · BManBJ-Laptop-Blake-atomicdb
- 1. Nh3 e6 2. e3 g6 … 20. Be3 Rhe8 21. Rfe1 Ne5 22. Bxc5 (User) · 512.0M nodes · MoNiKaMaDnEsS-DESKTOP-VG9VPVH-atomicdb#0
- 1. Nf3 f6 2. e4 e6 … Bxf4 10. h4 b6 11. a3 d5 (User) · 512.0M nodes · MoNiKaMaDnEsS-DESKTOP-VG9VPVH-atomicdb#1
- 1. Nf3 f6 2. Nc3 g6 … Ba5 11. e4 Rc8 12. O-O Bb6 (User) · 128.0M nodes · randomchampgamer-2026PC-atomicdb
- 1. Nf3 f6 2. Nc3 g6 … 11. Be8 f5 12. e4 h4 13. Bf7 (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 | 969 | 2 | |
| g1h3 | unsolved | 693 | 2 | |
| e2e3 | unsolved | 505 | 3 | |
| d2d4 | unsolved | 435 | 2 | |
| e2e4 | unsolved | 417 | 2 | |
| b1c3 | unsolved | 183 | 2 | |
| c2c3 | unsolved | 0 | 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 | -302 | 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 67.4% of the fleet | 4.16T | 22,267 |
| 2 | auranvesdranor 8.8% of the fleet | 541.68B | 3,233 |
| 3 | tenzink 8.3% of the fleet | 513.58B | 2,816 |
| 4 | BManBJ 8.3% of the fleet | 512.82B | 3,525 |
| 5 | randomchampgamer 4.7% of the fleet | 289.54B | 1,989 |
| 6 | MoNiKaMaDnEsS 2.3% of the fleet | 144.96B | 1,073 |
| 7 | RandomMatrix 0.2% of the fleet | 10.11B | 76 |
| 8 | Torom 0.1% of the fleet | 3.44B | 8 |
8 accounts · 6.18T nodes searched by the whole fleet.
All time
| Place | Contributor | Nodes | Analyses |
|---|---|---|---|
| 1 | NitroColoraze 39.2% of the fleet | 90.30T | 751,082 |
| 2 | tenzink 15.6% of the fleet | 36.00T | 302,694 |
| 3 | BManBJ 11.2% of the fleet | 25.74T | 176,705 |
| 4 | auranvesdranor 11.1% of the fleet | 25.68T | 184,767 |
| 5 | JackIV 4.4% of the fleet | 10.06T | 67,859 |
| 6 | randomchampgamer 3.8% of the fleet | 8.77T | 63,495 |
| 7 | RickEdinson 2.8% of the fleet | 6.50T | 43,070 |
| 8 | MoNiKaMaDnEsS 1.8% of the fleet | 4.10T | 26,341 |
| 9 | NeoArcturus 1.8% of the fleet | 4.09T | 16,756 |
| 10 | ijh 1.6% of the fleet | 3.57T | 37,348 |
and 22 more.
32 accounts · 230.51T 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 04:52 Solved: WHITE_WIN via MINIMAXview
1. d4 c6 2. Nc3 f6 … Qc8 13. O-O-O gxh6 14. Rdf1 Be6
1. d4 c6 2. Nc3 f6 3. Nf3 e6 4. g4 Nh6 5. e4 Bb4 6. e5 fxe5 7. Ng5 d5 8. h4 e5 9. Qe2 Nxg4 10. f3 Bg4 11. Bh3 e4 12. Bh6 Qc8 13. O-O-O gxh6 14. Rdf1 Be6 - Sep 27 04:52 Solved: WHITE_WIN via MATE_PVview
1. d4 c6 2. Nc3 f6 … Bc1 20. b4 Kc7 21. Qd7 Kb6
1. d4 c6 2. Nc3 f6 3. Nf3 e6 4. g4 Nh6 5. e4 Bb4 6. e5 fxe5 7. Ng5 d5 8. h4 e5 9. Qe2 Nxg4 10. f3 Bg4 11. Bh3 e4 12. Bh6 Qc8 13. O-O-O gxh6 14. Rdf1 Kd8 15. fxe4 Bf8 16. Bxg4 Bh6 17. Kb1 Qe6 18. Nxd5 Be3 19. Qg4 Bc1 20. b4 Kc7 21. Qd7 Kb6 - Sep 27 04:52 Solved: WHITE_WIN via MATE_PVview
1. d4 c6 2. Nc3 f6 … 19. Qg4 Bc1 20. b4 Kc7 21. Qd7
1. d4 c6 2. Nc3 f6 3. Nf3 e6 4. g4 Nh6 5. e4 Bb4 6. e5 fxe5 7. Ng5 d5 8. h4 e5 9. Qe2 Nxg4 10. f3 Bg4 11. Bh3 e4 12. Bh6 Qc8 13. O-O-O gxh6 14. Rdf1 Kd8 15. fxe4 Bf8 16. Bxg4 Bh6 17. Kb1 Qe6 18. Nxd5 Be3 19. Qg4 Bc1 20. b4 Kc7 21. Qd7 - Sep 27 04:52 Solved: WHITE_WIN via MATE_PVview
1. d4 c6 2. Nc3 f6 … Be3 19. Qg4 Bc1 20. b4 Kc7
1. d4 c6 2. Nc3 f6 3. Nf3 e6 4. g4 Nh6 5. e4 Bb4 6. e5 fxe5 7. Ng5 d5 8. h4 e5 9. Qe2 Nxg4 10. f3 Bg4 11. Bh3 e4 12. Bh6 Qc8 13. O-O-O gxh6 14. Rdf1 Kd8 15. fxe4 Bf8 16. Bxg4 Bh6 17. Kb1 Qe6 18. Nxd5 Be3 19. Qg4 Bc1 20. b4 Kc7 - Sep 27 04:52 Solved: WHITE_WIN via MATE_PVview
1. d4 c6 2. Nc3 f6 … 18. Nxd5 Be3 19. Qg4 Bc1 20. b4
1. d4 c6 2. Nc3 f6 3. Nf3 e6 4. g4 Nh6 5. e4 Bb4 6. e5 fxe5 7. Ng5 d5 8. h4 e5 9. Qe2 Nxg4 10. f3 Bg4 11. Bh3 e4 12. Bh6 Qc8 13. O-O-O gxh6 14. Rdf1 Kd8 15. fxe4 Bf8 16. Bxg4 Bh6 17. Kb1 Qe6 18. Nxd5 Be3 19. Qg4 Bc1 20. b4 - Sep 27 04:52 Solved: WHITE_WIN via MATE_PVview
1. d4 c6 2. Nc3 f6 … Qe6 18. Nxd5 Be3 19. Qg4 Bc1
1. d4 c6 2. Nc3 f6 3. Nf3 e6 4. g4 Nh6 5. e4 Bb4 6. e5 fxe5 7. Ng5 d5 8. h4 e5 9. Qe2 Nxg4 10. f3 Bg4 11. Bh3 e4 12. Bh6 Qc8 13. O-O-O gxh6 14. Rdf1 Kd8 15. fxe4 Bf8 16. Bxg4 Bh6 17. Kb1 Qe6 18. Nxd5 Be3 19. Qg4 Bc1 - Sep 27 04:52 Solved: WHITE_WIN via MATE_PVview
1. d4 c6 2. Nc3 f6 … 17. Kb1 Qe6 18. Nxd5 Be3 19. Qg4
1. d4 c6 2. Nc3 f6 3. Nf3 e6 4. g4 Nh6 5. e4 Bb4 6. e5 fxe5 7. Ng5 d5 8. h4 e5 9. Qe2 Nxg4 10. f3 Bg4 11. Bh3 e4 12. Bh6 Qc8 13. O-O-O gxh6 14. Rdf1 Kd8 15. fxe4 Bf8 16. Bxg4 Bh6 17. Kb1 Qe6 18. Nxd5 Be3 19. Qg4 - Sep 27 04:52 Solved: WHITE_WIN via MATE_PVview
1. d4 c6 2. Nc3 f6 … 16. Nxd5 Qe6 17. Bxe6 Bd2 18. Kb1
1. d4 c6 2. Nc3 f6 3. Nf3 e6 4. g4 Nh6 5. e4 Bb4 6. e5 fxe5 7. Ng5 d5 8. h4 e5 9. Qe2 Nxg4 10. f3 Bg4 11. Bh3 e4 12. Bh6 Qc8 13. O-O-O gxh6 14. Rdf1 Kd8 15. fxe4 Be6 16. Nxd5 Qe6 17. Bxe6 Bd2 18. Kb1 - Sep 27 04:52 Solved: WHITE_WIN via MATE_PVview
1. d4 c6 2. Nc3 f6 … Kd8 15. fxe4 Be6 16. Nxd5 Qe6
1. d4 c6 2. Nc3 f6 3. Nf3 e6 4. g4 Nh6 5. e4 Bb4 6. e5 fxe5 7. Ng5 d5 8. h4 e5 9. Qe2 Nxg4 10. f3 Bg4 11. Bh3 e4 12. Bh6 Qc8 13. O-O-O gxh6 14. Rdf1 Kd8 15. fxe4 Be6 16. Nxd5 Qe6 - Sep 27 04:52 Solved: WHITE_WIN via MATE_PVview
1. d4 c6 2. Nc3 f6 … 13. O-O-O gxh6 14. Rdf1 Be6 15. fxe4
1. d4 c6 2. Nc3 f6 3. Nf3 e6 4. g4 Nh6 5. e4 Bb4 6. e5 fxe5 7. Ng5 d5 8. h4 e5 9. Qe2 Nxg4 10. f3 Bg4 11. Bh3 e4 12. Bh6 Qc8 13. O-O-O gxh6 14. Rdf1 Be6 15. fxe4 - Sep 27 04:52 Solved: WHITE_WIN via MINIMAXview
1. d4 c6 2. Nc3 f6 … Qc8 13. O-O-O gxh6 14. Rdf1 Be7
1. d4 c6 2. Nc3 f6 3. Nf3 e6 4. g4 Nh6 5. e4 Bb4 6. e5 fxe5 7. Ng5 d5 8. h4 e5 9. Qe2 Nxg4 10. f3 Bg4 11. Bh3 e4 12. Bh6 Qc8 13. O-O-O gxh6 14. Rdf1 Be7 - Sep 27 04:52 Solved: WHITE_WIN via MATE_PVview
1. d4 c6 2. Nc3 f6 … h5 33. Rc7 c5 34. Ra7 Kb5
1. d4 c6 2. Nc3 f6 3. Nf3 e6 4. g4 Nh6 5. e4 Bb4 6. e5 fxe5 7. Ng5 d5 8. h4 e5 9. Qe2 Nxg4 10. f3 Bg4 11. Bh3 e4 12. Bh6 Qc8 13. O-O-O gxh6 14. Rdf1 Be7 15. b4 Qe6 16. Nxd5 Nd7 17. fxe4 O-O-O 18. Qxe7 b5 19. Rf7 a5 20. Re1 Re8 21. Rc7 Kb8 22. Rc8 Ka7 23. Re7 Rxe7 24. Bxg4 axb4 25. Ra8 Kb7 26. Rb8 Ka7 27. c4 bxc4 28. a4 Ka6 29. Ra8 Kb7 30. a5 h6 31. Rb8 Ka6 32. Rb7 h5 33. Rc7 c5 34. Ra7 Kb5