86.1M
positions
16.4M
practically solved
317.24T
engine nodes
2.4M
analyses
132
in queue
13
active workers
60
active cores
4.5M
nodes / sec
24.0
positions / min
145
proof number
4,661
disproof number
Root conquest: 0/20 first moves solved · 19.0% of tree positions solved · last 24h: 41,830 closures, 3.75T nodes searched
Proof health & closures by source
Proof health · median disproof number on the AND frontier: 70 over 209 open obligations, of which 38 (18.2%) 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 1.8m (median of 22) · measured at 2026-10-18 04:00 UTC
Closures by source, last 24h (41830 of 41830 labelled): USER 91.0% (38078) · FILL 1.1% (461) · AUTO 7.6% (3199) · SOLVE 0.0% (0) · NONE 0.2% (92) · last 7d (654011 of 654011): USER 86.1% (562824) · FILL 1.1% (7339) · AUTO 12.7% (83316) · SOLVE 0.0% (0) · NONE 0.1% (532). 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. e4 e6 … Bb6 28. c4 Kg6 29. Kh5 Bc7 (User) · 128.0M nodes · BManBJ-Blake-atomicdb
- 1. Nf3 f6 2. e4 e6 … Bb6 28. c4 Kg6 29. e5 Rg3 (User) · 128.0M nodes · BManBJ-Blake-atomicdb#1
- 1. Nf3 f6 2. e4 e6 … Bb6 28. c4 Kg6 29. e5 Rd4 (User) · 128.0M nodes · BManBJ-Blake-atomicdb#2
- 1. Nf3 f6 2. e4 e6 … Nd3 19. Kd1 Bb7 20. b4 Rh7 (User) · 2.00B nodes · BManBJ-Laptop-Blake-atomicdb
- 1. Nf3 f6 2. e4 e6 … Bb6 27. b4 Bd8 28. c4 Rd4 (User) · 128.0M nodes · RickEdinson-MSI-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 | 1131 | 2 | |
| g1h3 | unsolved | 821 | 2 | |
| e2e3 | unsolved | 505 | 3 | |
| d2d4 | unsolved | 400 | 2 | |
| e2e4 | unsolved | 400 | 2 | |
| b1c3 | unsolved | 138 | 2 | |
| c2c3 | unsolved | 0 | 2 | |
| g2g3 | unsolved | 0 | 2 | |
| b1a3 | unsolved | 0 | 3 | |
| b2b4 | unsolved | -65 | 3 | |
| h2h3 | unsolved | -97 | 2 | |
| d2d3 | unsolved | -98 | 2 | |
| a2a3 | unsolved | -100 | 2 | |
| f2f3 | unsolved | -117 | 3 | |
| b2b3 | unsolved | -144 | 1 | |
| f2f4 | unsolved | -260 | 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 | Torom 44.1% of the fleet | 1.66T | 10,456 |
| 2 | BManBJ 42.2% of the fleet | 1.59T | 7,411 |
| 3 | RickEdinson 12.7% of the fleet | 477.65B | 2,355 |
| 4 | MoNiKaMaDnEsS 0.9% of the fleet | 34.06B | 188 |
| 5 | soothdest <0.1% of the fleet | 256.7M | 3 |
5 accounts · 3.76T nodes searched by the whole fleet.
All time
| Place | Contributor | Nodes | Analyses |
|---|---|---|---|
| 1 | NitroColoraze 28.4% of the fleet | 90.30T | 751,082 |
| 2 | BManBJ 17.2% of the fleet | 54.59T | 383,679 |
| 3 | tenzink 13.5% of the fleet | 42.83T | 349,427 |
| 4 | auranvesdranor 9.9% of the fleet | 31.40T | 228,002 |
| 5 | randomchampgamer 6.3% of the fleet | 19.85T | 140,897 |
| 6 | Torom 5.5% of the fleet | 17.35T | 123,808 |
| 7 | RickEdinson 4.6% of the fleet | 14.73T | 98,528 |
| 8 | JackIV 3.2% of the fleet | 10.06T | 67,859 |
| 9 | MoNiKaMaDnEsS 2.7% of the fleet | 8.48T | 58,201 |
| 10 | gannet 2.3% of the fleet | 7.24T | 46,848 |
and 25 more.
35 accounts · 317.43T 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 · 18 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 · 5 votes
- The weaker of the two f-pawn advances for 1. ...d61. Nf3 d6 2. Ng5 f5 3. Nf7 Qd7 4. e4proposed by MoNiKaMaDnEsS · 4 votes
- Refuting 1... d61. Nf3 d6 2. Nc3proposed by randomchampgamer · 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 23 proposals · see every proposal
Milestones
- Oct 18 04:48 Solved: BLACK_WIN via MATE_PVview
1. Nf3 f6 2. e4 e6 … 28. e5 Bd6 29. c4 Kh6 30. Kf4
1. Nf3 f6 2. e4 e6 3. Na3 c6 4. Nb5 cxb5 5. d4 Nc6 6. Bb5 a6 7. c3 h5 8. Ne5 fxe5 9. Bg5 Nf6 10. d5 Bc5 11. f4 Bf2 12. Kf1 d6 13. dxe6 Qa5 14. Qxd6 axb5 15. Rd1 O-O 16. Be7 Kh7 17. g4 g5 18. Bxf8 gxf4 19. Ke2 hxg4 20. Rhg1 Bg4 21. Rxg4 Rf8 22. Rd7 Kg6 23. Rg7 Kh5 24. Rf7 Rd8 25. Kf3 Rd3 26. Kg4 Bc5 27. b4 Rg3 28. e5 Bd6 29. c4 Kh6 30. Kf4 - Oct 18 04:48 Solved: BLACK_WIN via MATE_PVview
1. Nf3 f6 2. e4 e6 … 28. e5 Bd6 29. c4 Kh6 30. Kf5
1. Nf3 f6 2. e4 e6 3. Na3 c6 4. Nb5 cxb5 5. d4 Nc6 6. Bb5 a6 7. c3 h5 8. Ne5 fxe5 9. Bg5 Nf6 10. d5 Bc5 11. f4 Bf2 12. Kf1 d6 13. dxe6 Qa5 14. Qxd6 axb5 15. Rd1 O-O 16. Be7 Kh7 17. g4 g5 18. Bxf8 gxf4 19. Ke2 hxg4 20. Rhg1 Bg4 21. Rxg4 Rf8 22. Rd7 Kg6 23. Rg7 Kh5 24. Rf7 Rd8 25. Kf3 Rd3 26. Kg4 Bc5 27. b4 Rg3 28. e5 Bd6 29. c4 Kh6 30. Kf5 - Oct 18 04:48 Solved: BLACK_WIN via MATE_PVview
1. Nf3 f6 2. e4 e6 … 28. e5 Bd6 29. c4 Kg6 30. Kf4
1. Nf3 f6 2. e4 e6 3. Na3 c6 4. Nb5 cxb5 5. d4 Nc6 6. Bb5 a6 7. c3 h5 8. Ne5 fxe5 9. Bg5 Nf6 10. d5 Bc5 11. f4 Bf2 12. Kf1 d6 13. dxe6 Qa5 14. Qxd6 axb5 15. Rd1 O-O 16. Be7 Kh7 17. g4 g5 18. Bxf8 gxf4 19. Ke2 hxg4 20. Rhg1 Bg4 21. Rxg4 Rf8 22. Rd7 Kg6 23. Rg7 Kh5 24. Rf7 Rd8 25. Kf3 Rd3 26. Kg4 Bc5 27. b4 Rg3 28. e5 Bd6 29. c4 Kg6 30. Kf4 - Oct 18 04:48 Solved: BLACK_WIN via MATE_PVview
1. Nf3 f6 2. e4 e6 … 28. e5 Bd6 29. c4 Kg6 30. Kf5
1. Nf3 f6 2. e4 e6 3. Na3 c6 4. Nb5 cxb5 5. d4 Nc6 6. Bb5 a6 7. c3 h5 8. Ne5 fxe5 9. Bg5 Nf6 10. d5 Bc5 11. f4 Bf2 12. Kf1 d6 13. dxe6 Qa5 14. Qxd6 axb5 15. Rd1 O-O 16. Be7 Kh7 17. g4 g5 18. Bxf8 gxf4 19. Ke2 hxg4 20. Rhg1 Bg4 21. Rxg4 Rf8 22. Rd7 Kg6 23. Rg7 Kh5 24. Rf7 Rd8 25. Kf3 Rd3 26. Kg4 Bc5 27. b4 Rg3 28. e5 Bd6 29. c4 Kg6 30. Kf5 - Oct 18 04:47 Solved: BLACK_WIN via MATE_PVview
1. Nf3 f6 2. e4 e6 … 29. Kh4 Rg4 30. Kh3 Rh4 31. Kg2
1. Nf3 f6 2. e4 e6 3. Na3 c6 4. Nb5 cxb5 5. d4 Nc6 6. Bb5 a6 7. c3 h5 8. Ne5 fxe5 9. Bg5 Nf6 10. d5 Bc5 11. f4 Bf2 12. Kf1 d6 13. dxe6 Qa5 14. Qxd6 axb5 15. Rd1 O-O 16. Be7 Kh7 17. g4 g5 18. Bxf8 gxf4 19. Ke2 hxg4 20. Rhg1 Bg4 21. Rxg4 Rf8 22. Rd7 Kg6 23. Rg7 Kh5 24. Rf7 Rd8 25. Kf3 Bc5 26. e5 Rd1 27. Kg4 Rg1 28. c4 Kh6 29. Kh4 Rg4 30. Kh3 Rh4 31. Kg2 - Oct 18 04:47 Solved: BLACK_WIN via MATE_PVview
1. Nf3 f6 2. e4 e6 … Kh6 29. Kh4 Rg4 30. Kh3 Rh4
1. Nf3 f6 2. e4 e6 3. Na3 c6 4. Nb5 cxb5 5. d4 Nc6 6. Bb5 a6 7. c3 h5 8. Ne5 fxe5 9. Bg5 Nf6 10. d5 Bc5 11. f4 Bf2 12. Kf1 d6 13. dxe6 Qa5 14. Qxd6 axb5 15. Rd1 O-O 16. Be7 Kh7 17. g4 g5 18. Bxf8 gxf4 19. Ke2 hxg4 20. Rhg1 Bg4 21. Rxg4 Rf8 22. Rd7 Kg6 23. Rg7 Kh5 24. Rf7 Rd8 25. Kf3 Bc5 26. e5 Rd1 27. Kg4 Rg1 28. c4 Kh6 29. Kh4 Rg4 30. Kh3 Rh4 - Oct 18 04:47 Solved: BLACK_WIN via MATE_PVview
1. Nf3 f6 2. e4 e6 … 28. c4 Kh6 29. Kh4 Rg4 30. Kh3
1. Nf3 f6 2. e4 e6 3. Na3 c6 4. Nb5 cxb5 5. d4 Nc6 6. Bb5 a6 7. c3 h5 8. Ne5 fxe5 9. Bg5 Nf6 10. d5 Bc5 11. f4 Bf2 12. Kf1 d6 13. dxe6 Qa5 14. Qxd6 axb5 15. Rd1 O-O 16. Be7 Kh7 17. g4 g5 18. Bxf8 gxf4 19. Ke2 hxg4 20. Rhg1 Bg4 21. Rxg4 Rf8 22. Rd7 Kg6 23. Rg7 Kh5 24. Rf7 Rd8 25. Kf3 Bc5 26. e5 Rd1 27. Kg4 Rg1 28. c4 Kh6 29. Kh4 Rg4 30. Kh3 - Oct 18 04:47 Solved: BLACK_WIN via MATE_PVview
1. Nf3 f6 2. e4 e6 … 28. c4 Kh6 29. Kh4 Be7 30. Kh3
1. Nf3 f6 2. e4 e6 3. Na3 c6 4. Nb5 cxb5 5. d4 Nc6 6. Bb5 a6 7. c3 h5 8. Ne5 fxe5 9. Bg5 Nf6 10. d5 Bc5 11. f4 Bf2 12. Kf1 d6 13. dxe6 Qa5 14. Qxd6 axb5 15. Rd1 O-O 16. Be7 Kh7 17. g4 g5 18. Bxf8 gxf4 19. Ke2 hxg4 20. Rhg1 Bg4 21. Rxg4 Rf8 22. Rd7 Kg6 23. Rg7 Kh5 24. Rf7 Rd8 25. Kf3 Bc5 26. e5 Rd1 27. Kg4 Rg1 28. c4 Kh6 29. Kh4 Be7 30. Kh3 - Oct 18 04:45 Solved: WHITE_WIN via MATE_PVview
1. Nf3 f6 2. e4 e6 … Ba6 16. f6 Bc5 17. f7 Kg7
1. Nf3 f6 2. e4 e6 3. Na3 c6 4. Nb5 cxb5 5. d4 Nc6 6. Bb5 Nh6 7. Ne5 fxe5 8. Qh5 g6 9. Qg5 Qxg5 10. O-O Bb4 11. e5 h6 12. c3 O-O 13. f4 Rb8 14. h4 b6 15. f5 Ba6 16. f6 Bc5 17. f7 Kg7 - Oct 18 04:45 Solved: WHITE_WIN via MATE_PVview
1. Nf3 f6 2. e4 e6 … Ba6 16. f6 Bc5 17. f7 Kh7
1. Nf3 f6 2. e4 e6 3. Na3 c6 4. Nb5 cxb5 5. d4 Nc6 6. Bb5 Nh6 7. Ne5 fxe5 8. Qh5 g6 9. Qg5 Qxg5 10. O-O Bb4 11. e5 h6 12. c3 O-O 13. f4 Rb8 14. h4 b6 15. f5 Ba6 16. f6 Bc5 17. f7 Kh7 - Oct 18 04:45 Solved: WHITE_WIN via MATE_PVview
1. Nf3 f6 2. e4 e6 … Ba6 16. f6 Nd8 17. f7 Kg7
1. Nf3 f6 2. e4 e6 3. Na3 c6 4. Nb5 cxb5 5. d4 Nc6 6. Bb5 Nh6 7. Ne5 fxe5 8. Qh5 g6 9. Qg5 Qxg5 10. O-O Bb4 11. e5 h6 12. c3 O-O 13. f4 Rb8 14. h4 b6 15. f5 Ba6 16. f6 Nd8 17. f7 Kg7 - Oct 18 04:45 Solved: WHITE_WIN via MATE_PVview
1. Nf3 f6 2. e4 e6 … Ba6 16. f6 Nd8 17. f7 Kh7
1. Nf3 f6 2. e4 e6 3. Na3 c6 4. Nb5 cxb5 5. d4 Nc6 6. Bb5 Nh6 7. Ne5 fxe5 8. Qh5 g6 9. Qg5 Qxg5 10. O-O Bb4 11. e5 h6 12. c3 O-O 13. f4 Rb8 14. h4 b6 15. f5 Ba6 16. f6 Nd8 17. f7 Kh7