74.0M
positions
13.8M
practically solved
264.95T
engine nodes
2.0M
analyses
3,416
in queue
8
active workers
48
active cores
7.9M
nodes / sec
20.6
positions / min
82
proof number
3,797
disproof number
Root conquest: 0/20 first moves solved · 18.6% of tree positions solved · last 24h: 134,669 closures, 3.41T nodes searched
Proof health & closures by source
Proof health · median disproof number on the AND frontier: 69 over 211 open obligations, of which 39 (18.5%) 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 5.3m (median of 24) · measured at 2026-10-03 21:00 UTC
Closures by source, last 24h (134669 of 134669 labelled): USER 99.3% (133718) · FILL 0.0% (0) · AUTO 0.0% (0) · SOLVE 0.0% (0) · NONE 0.7% (951) · last 7d (2351780 of 2351780): USER 99.6% (2342934) · FILL 0.0% (937) · AUTO 0.2% (3713) · SOLVE 0.0% (0) · NONE 0.2% (4196). 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. Ne5 fxe5 … 26. Ka1 Kg5 27. Bf7 Rc8 28. a3 (User) · 128.0M nodes · BManBJ-Blake-atomicdb
- 1. Nf3 f6 2. Ne5 fxe5 … 26. Ka1 Kg5 27. Bf7 Rc8 28. e4 (User) · 128.0M nodes · BManBJ-Laptop-Blake-atomicdb
- 1. e4 d5 2. Nf3 f6 … 21. Nd5 Ke8 22. f3 cxd5 23. c4 (User) · 128.0M nodes · randomchampgamer-2026PC-atomicdb
- 1. Nf3 f6 2. Ne5 fxe5 … 26. Ka1 Kg5 27. Bf7 Rc8 28. c7 (User) · 128.0M nodes · RickEdinson-MSI-atomicdb
- 1. e4 d5 2. Nf3 f6 … 21. Nd5 Kd8 22. Kd1 g5 23. Nc7 (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 | 724 | 2 | |
| e2e3 | unsolved | 505 | 3 | |
| d2d4 | unsolved | 440 | 2 | |
| e2e4 | unsolved | 418 | 2 | |
| b1c3 | unsolved | 114 | 2 | |
| c2c3 | unsolved | 0 | 2 | |
| g2g3 | unsolved | 0 | 2 | |
| b1a3 | unsolved | 0 | 3 | |
| b2b4 | unsolved | -73 | 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 | BManBJ 42.0% of the fleet | 1.43T | 10,554 |
| 2 | randomchampgamer 20.6% of the fleet | 703.38B | 5,129 |
| 3 | tenzink 20.0% of the fleet | 681.12B | 4,730 |
| 4 | RickEdinson 14.6% of the fleet | 497.29B | 3,634 |
| 5 | auranvesdranor 1.6% of the fleet | 54.74B | 412 |
| 6 | MoNiKaMaDnEsS 1.2% of the fleet | 41.03B | 322 |
6 accounts · 3.41T nodes searched by the whole fleet.
All time
| Place | Contributor | Nodes | Analyses |
|---|---|---|---|
| 1 | NitroColoraze 34.1% of the fleet | 90.30T | 751,082 |
| 2 | tenzink 15.1% of the fleet | 40.04T | 330,705 |
| 3 | BManBJ 13.4% of the fleet | 35.44T | 249,964 |
| 4 | auranvesdranor 11.8% of the fleet | 31.40T | 228,002 |
| 5 | randomchampgamer 4.9% of the fleet | 12.89T | 95,898 |
| 6 | JackIV 3.8% of the fleet | 10.06T | 67,859 |
| 7 | RickEdinson 3.2% of the fleet | 8.44T | 56,853 |
| 8 | gannet 2.7% of the fleet | 7.24T | 46,848 |
| 9 | MoNiKaMaDnEsS 2.0% of the fleet | 5.21T | 34,838 |
| 10 | NeoArcturus 1.5% of the fleet | 4.09T | 16,758 |
and 25 more.
35 accounts · 265.03T 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 · 17 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 21:32 Solved: WHITE_WIN via MINIMAXview
1. e4 d5 2. Nf3 f6 … a6 20. Nd5 Kh6 21. f4 c5
1. e4 d5 2. Nf3 f6 3. g4 c6 4. Nc3 Nh6 5. d4 b5 6. exd5 e5 7. Nh4 Bxg4 8. Bh3 Ng4 9. Bxg4 g6 10. Bh6 Bxh6 11. Qg4 f5 12. Qh4 Qxh4 13. dxe5 O-O 14. O-O-O Nd7 15. Rhe1 Rfd8 16. Rxd7 Re8 17. b4 Rxe1 18. a4 Kg7 19. a5 a6 20. Nd5 Kh6 21. f4 c5 - Oct 03 21:32 Solved: WHITE_WIN via MATE_PVview
1. e4 d5 2. Nf3 f6 … Kh6 21. f4 c5 22. Nf6 Kg7
1. e4 d5 2. Nf3 f6 3. g4 c6 4. Nc3 Nh6 5. d4 b5 6. exd5 e5 7. Nh4 Bxg4 8. Bh3 Ng4 9. Bxg4 g6 10. Bh6 Bxh6 11. Qg4 f5 12. Qh4 Qxh4 13. dxe5 O-O 14. O-O-O Nd7 15. Rhe1 Rfd8 16. Rxd7 Re8 17. b4 Rxe1 18. a4 Kg7 19. a5 a6 20. Nd5 Kh6 21. f4 c5 22. Nf6 Kg7 - Oct 03 21:32 Solved: WHITE_WIN via MATE_PVview
1. e4 d5 2. Nf3 f6 … 20. Nd5 Kh6 21. f4 c5 22. Nf6
1. e4 d5 2. Nf3 f6 3. g4 c6 4. Nc3 Nh6 5. d4 b5 6. exd5 e5 7. Nh4 Bxg4 8. Bh3 Ng4 9. Bxg4 g6 10. Bh6 Bxh6 11. Qg4 f5 12. Qh4 Qxh4 13. dxe5 O-O 14. O-O-O Nd7 15. Rhe1 Rfd8 16. Rxd7 Re8 17. b4 Rxe1 18. a4 Kg7 19. a5 a6 20. Nd5 Kh6 21. f4 c5 22. Nf6 - Oct 03 21:32 Solved: WHITE_WIN via MATE_PVview
1. e4 d5 2. Nf3 f6 … Kh6 21. f4 c5 22. Ne7 Kg7
1. e4 d5 2. Nf3 f6 3. g4 c6 4. Nc3 Nh6 5. d4 b5 6. exd5 e5 7. Nh4 Bxg4 8. Bh3 Ng4 9. Bxg4 g6 10. Bh6 Bxh6 11. Qg4 f5 12. Qh4 Qxh4 13. dxe5 O-O 14. O-O-O Nd7 15. Rhe1 Rfd8 16. Rxd7 Re8 17. b4 Rxe1 18. a4 Kg7 19. a5 a6 20. Nd5 Kh6 21. f4 c5 22. Ne7 Kg7 - Oct 03 21:32 Solved: WHITE_WIN via MATE_PVview
1. e4 d5 2. Nf3 f6 … 20. Nd5 Kh6 21. f4 c5 22. Ne7
1. e4 d5 2. Nf3 f6 3. g4 c6 4. Nc3 Nh6 5. d4 b5 6. exd5 e5 7. Nh4 Bxg4 8. Bh3 Ng4 9. Bxg4 g6 10. Bh6 Bxh6 11. Qg4 f5 12. Qh4 Qxh4 13. dxe5 O-O 14. O-O-O Nd7 15. Rhe1 Rfd8 16. Rxd7 Re8 17. b4 Rxe1 18. a4 Kg7 19. a5 a6 20. Nd5 Kh6 21. f4 c5 22. Ne7 - Oct 03 21:32 Solved: WHITE_WIN via MINIMAXview
1. e4 d5 2. Nf3 f6 … Ke6 21. Nd5 f4 22. Kd1 f3
1. e4 d5 2. Nf3 f6 3. g4 c6 4. Nc3 Nh6 5. d4 b5 6. exd5 e5 7. Nh4 Bxg4 8. Bh3 Ng4 9. Bxg4 g6 10. Bh6 Bxh6 11. Qg4 f5 12. Qh4 Qxh4 13. dxe5 O-O 14. O-O-O Nd7 15. Rhe1 Rfd8 16. Rxd7 Re8 17. Re7 Rxe7 18. b4 Kf7 19. a4 a6 20. a5 Ke6 21. Nd5 f4 22. Kd1 f3 - Oct 03 21:32 Solved: WHITE_WIN via MATE_PVview
1. e4 d5 2. Nf3 f6 … c5 29. c4 cxb4 30. cxb5 g4
1. e4 d5 2. Nf3 f6 3. g4 c6 4. Nc3 Nh6 5. d4 b5 6. exd5 e5 7. Nh4 Bxg4 8. Bh3 Ng4 9. Bxg4 g6 10. Bh6 Bxh6 11. Qg4 f5 12. Qh4 Qxh4 13. dxe5 O-O 14. O-O-O Nd7 15. Rhe1 Rfd8 16. Rxd7 Re8 17. Re7 Rxe7 18. b4 Kf7 19. a4 a6 20. a5 Ke6 21. Nd5 f4 22. Kd1 f3 23. Kd2 Kd7 24. Nc7 Kc8 25. Nxa6 Kb7 26. a6 Ka7 27. Ke1 g5 28. h3 c5 29. c4 cxb4 30. cxb5 g4 - Oct 03 21:32 Solved: WHITE_WIN via MATE_PVview
1. e4 d5 2. Nf3 f6 … 28. h3 c5 29. c4 cxb4 30. cxb5
1. e4 d5 2. Nf3 f6 3. g4 c6 4. Nc3 Nh6 5. d4 b5 6. exd5 e5 7. Nh4 Bxg4 8. Bh3 Ng4 9. Bxg4 g6 10. Bh6 Bxh6 11. Qg4 f5 12. Qh4 Qxh4 13. dxe5 O-O 14. O-O-O Nd7 15. Rhe1 Rfd8 16. Rxd7 Re8 17. Re7 Rxe7 18. b4 Kf7 19. a4 a6 20. a5 Ke6 21. Nd5 f4 22. Kd1 f3 23. Kd2 Kd7 24. Nc7 Kc8 25. Nxa6 Kb7 26. a6 Ka7 27. Ke1 g5 28. h3 c5 29. c4 cxb4 30. cxb5 - Oct 03 21:32 Solved: WHITE_WIN via MATE_PVview
1. e4 d5 2. Nf3 f6 … g5 28. h3 c5 29. c4 cxb4
1. e4 d5 2. Nf3 f6 3. g4 c6 4. Nc3 Nh6 5. d4 b5 6. exd5 e5 7. Nh4 Bxg4 8. Bh3 Ng4 9. Bxg4 g6 10. Bh6 Bxh6 11. Qg4 f5 12. Qh4 Qxh4 13. dxe5 O-O 14. O-O-O Nd7 15. Rhe1 Rfd8 16. Rxd7 Re8 17. Re7 Rxe7 18. b4 Kf7 19. a4 a6 20. a5 Ke6 21. Nd5 f4 22. Kd1 f3 23. Kd2 Kd7 24. Nc7 Kc8 25. Nxa6 Kb7 26. a6 Ka7 27. Ke1 g5 28. h3 c5 29. c4 cxb4 - Oct 03 21:32 Solved: WHITE_WIN via MATE_PVview
1. e4 d5 2. Nf3 f6 … 27. Ke1 g5 28. h3 c5 29. c4
1. e4 d5 2. Nf3 f6 3. g4 c6 4. Nc3 Nh6 5. d4 b5 6. exd5 e5 7. Nh4 Bxg4 8. Bh3 Ng4 9. Bxg4 g6 10. Bh6 Bxh6 11. Qg4 f5 12. Qh4 Qxh4 13. dxe5 O-O 14. O-O-O Nd7 15. Rhe1 Rfd8 16. Rxd7 Re8 17. Re7 Rxe7 18. b4 Kf7 19. a4 a6 20. a5 Ke6 21. Nd5 f4 22. Kd1 f3 23. Kd2 Kd7 24. Nc7 Kc8 25. Nxa6 Kb7 26. a6 Ka7 27. Ke1 g5 28. h3 c5 29. c4 - Oct 03 21:32 Solved: WHITE_WIN via MATE_PVview
1. e4 d5 2. Nf3 f6 … Ka7 27. Ke1 g5 28. h3 c5
1. e4 d5 2. Nf3 f6 3. g4 c6 4. Nc3 Nh6 5. d4 b5 6. exd5 e5 7. Nh4 Bxg4 8. Bh3 Ng4 9. Bxg4 g6 10. Bh6 Bxh6 11. Qg4 f5 12. Qh4 Qxh4 13. dxe5 O-O 14. O-O-O Nd7 15. Rhe1 Rfd8 16. Rxd7 Re8 17. Re7 Rxe7 18. b4 Kf7 19. a4 a6 20. a5 Ke6 21. Nd5 f4 22. Kd1 f3 23. Kd2 Kd7 24. Nc7 Kc8 25. Nxa6 Kb7 26. a6 Ka7 27. Ke1 g5 28. h3 c5 - Oct 03 21:32 Solved: WHITE_WIN via MATE_PVview
1. e4 d5 2. Nf3 f6 … 26. a6 Ka7 27. Ke1 g5 28. h3
1. e4 d5 2. Nf3 f6 3. g4 c6 4. Nc3 Nh6 5. d4 b5 6. exd5 e5 7. Nh4 Bxg4 8. Bh3 Ng4 9. Bxg4 g6 10. Bh6 Bxh6 11. Qg4 f5 12. Qh4 Qxh4 13. dxe5 O-O 14. O-O-O Nd7 15. Rhe1 Rfd8 16. Rxd7 Re8 17. Re7 Rxe7 18. b4 Kf7 19. a4 a6 20. a5 Ke6 21. Nd5 f4 22. Kd1 f3 23. Kd2 Kd7 24. Nc7 Kc8 25. Nxa6 Kb7 26. a6 Ka7 27. Ke1 g5 28. h3