Ember - new UCI engine written on Rust

[DreamerExx]

Wow, Ember is destroying the Houdini 5 Pro in 8+ 0.08
[pgn][Event "960teest"]
[Site "?"]
[Date "2026.06.21"]
[Round "10"]
[White "Houdini"]
[Black "Ember"]
[Result "0-1"]
[FEN "qbnrbnkr/pppppppp/8/8/8/8/PPPPPPPP/QBNRBNKR w KQkq - 0 1"]
[GameDuration "00:00:27"]
[GameEndTime "2026-06-21T19:27:57.634 RTZ 2 (зима)"]
[GameStartTime "2026-06-21T19:27:30.001 RTZ 2 (зима)"]
[PlyCount "162"]
[SetUp "1"]
[TimeControl "8+0.08"]
[Variant "fischerandom"]

1. c4 {+0.24/12 0.54s} c5 {-0.56/11 0.32s} 2. d4 {+0.15/12 0.97s}
cxd4 {-0.12/12 0.31s} 3. b3 {-0.05/11 0.31s} e5 {+0.21/12 0.30s}
4. e3 {-0.13/12 0.58s} dxe3 {+0.16/13 0.29s} 5. Nxe3 {+0.26/10 0.13s}
Ne7 {-0.16/10 0.29s} 6. Be4 {+0.27/10 0.18s} d6 {+0.38/11 0.28s}
7. Ba5 {+0.26/11 0.17s} Rc8 {+0.44/12 0.28s} 8. O-O {-0.13/10 0.45s}
Bc6 {+0.70/14 0.27s} 9. Bf5 {-0.19/12 0.85s} Nxf5 {+0.98/10 0.26s}
10. Nxf5 {-0.87/12 0.35s} Ng6 {+1.22/11 0.26s} 11. Bb4 {-0.88/11 0.17s}
h5 {+0.66/8 0.25s} 12. Nxd6 {+0.26/10 0.20s} Bxd6 {+1.36/8 0.25s}
13. Bxd6 {-0.07/12 0.95s} h4 {+0.76/8 0.24s} 14. f3 {-0.05/11 0.42s}
h3 {+2.59/10 0.24s} 15. g3 {-0.30/12 0.38s} b5 {+2.29/11 0.23s}
16. Rd3 {-0.31/11 0.23s} Rh5 {+3.27/9 0.23s} 17. c5 {-0.33/11 0.24s}
a5 {+2.91/11 0.22s} 18. a3 {-0.06/10 0.12s} Rf5 {+3.96/12 0.22s}
19. Qc3 {-0.45/12 0.60s} b4 {+4.15/12 0.21s} 20. axb4 {+0.26/11 0.084s}
axb4 {+3.74/12 0.21s} 21. Qxb4 {-0.05/12 0.34s} Rxf3 {+3.65/9 0.20s}
22. Rfxf3 {+0.27/11 0.19s} Bxf3 {+3.74/12 0.20s} 23. Rd2 {+0.21/12 0.39s}
Bb7 {+3.60/7 0.20s} 24. Ra2 {+1.18/11 0.079s} Ba6 {+1.16/11 0.19s}
25. Qa5 {+0.24/12 0.94s} Rc6 {+0.71/9 0.19s} 26. Qd2 {+0.37/11 0.11s}
Qe8 {+2.19/9 0.19s} 27. Nd3 {+0.62/10 0.11s} Bb5 {+1.77/10 0.18s}
28. Nb4 {+0.63/11 0.14s} Rc8 {+2.12/10 0.18s} 29. Nd5 {+0.38/10 0.088s}
Qe6 {+2.84/11 0.18s} 30. Nc7 {+0.59/10 0.046s} Rxc7 {+2.89/11 0.17s}
31. Bxc7 {-0.08/10 0.11s} Qxb3 {+2.90/9 0.17s} 32. Ra8+ {-0.16/10 0.083s}
Kh7 {+2.92/10 0.17s} 33. Ra1 {-0.21/11 0.070s} f6 {+3.29/9 0.17s}
34. Bd6 {-0.06/11 0.090s} Qf3 {+5.12/10 0.16s} 35. Qf2 {-0.06/10 0s}
Qd5 {+4.52/9 0.16s} 36. Re1 {-0.15/14 0.15s} Bc6 {+4.87/8 0.16s}
37. Kf1 {-0.94/11 0.087s} Kg8 {+4.87/7 0.16s} 38. Ra1 {-1.01/10 0.086s}
Qd3+ {+5.99/7 0.15s} 39. Kg1 {-3.31/11 0.076s} Qe4 {+5.41/8 0.15s}
40. Kf1 {-4.48/11 0.078s} Bb5+ {+5.34/7 0.15s} 41. Kg1 {-4.15/11 0.082s}
Bc6 {+5.67/7 0.15s} 42. Kf1 {-0.06/19 0.043s} Bb5+ {+6.54/6 0.14s}
43. Kg1 {-0.06/27 0.11s} Nh4 {+6.38/9 0.14s} 44. Rf1 {-4.38/12 0.083s}
Bxf1 {+6.51/8 0.14s} 45. Kxf1 {-4.18/9 0.066s} Qd3+ {+7.28/5 0.14s}
46. Qe2 {-4.86/12 0.092s} Qf5+ {+6.40/7 0.14s} 47. Qf2 {-4.86/12 0.001s}
Nf3 {+8.06/6 0.14s} 48. Ke2 {-6.04/11 0.15s} Qe4+ {+8.68/6 0.13s}
49. Qe3 {-10.32/12 0.087s} Nd4+ {+9.86/7 0.13s} 50. Kd2 {-10.82/13 0.084s}
Qc2+ {+9.40/4 0.13s} 51. Ke1 {-10.82/13 0.001s} Qxh2 {+9.40/7 0.13s}
52. Qf2 {-13.28/12 0.15s} Qh1+ {+10.36/7 0.13s} 53. Kd2 {-16.22/10 0.088s}
Qd5 {+10.64/6 0.13s} 54. Bxe5 {-9.12/9 0.045s} Nf3+ {+12.01/6 0.12s}
55. Kc3 {-10.41/11 0.11s} Nxe5 {+13.32/5 0.12s} 56. Qe2 {-13.96/11 0.084s}
Qxc5+ {+14.00/6 0.12s} 57. Kb3 {-90.76/13 0.082s} Qg1 {+16.47/7 0.12s}
58. Qa2 {-11.43/9 0.079s} Qxg3+ {+19.85/8 0.12s} 59. Ka4+ {-11.19/9 0.060s}
Kh7 {+20.17/8 0.12s} 60. Qc2+ {-11.70/9 0.099s} Kh6 {+21.02/8 0.12s}
61. Qd2+ {-87.20/10 0.082s} g5 {+23.52/8 0.12s} 62. Qd8 {-12.32/9 0.055s}
Qf4+ {+23.69/8 0.11s} 63. Ka3 {-12.32/8 0.016s} Kh5 {+28.41/8 0.11s}
64. Qe8+ {-87.52/11 0.16s} Kg4 {+31.18/9 0.11s} 65. Qc8+ {-23.84/11 0.090s}
f5 {+32.58/9 0.11s} 66. Qc2 {-87.68/10 0.081s} Qe3+ {+33.68/7 0.11s}
67. Ka2 {-13.46/9 0.050s} f4 {+36.20/8 0.11s} 68. Qc8+ {-13.36/9 0.10s}
Kg3 {+37.53/8 0.11s} 69. Qg8 {-87.52/11 0.083s} f3 {+40.36/8 0.11s}
70. Qb8 {-99.96/12 0.080s} Kg2 {+43.04/8 0.11s} 71. Kb2 {-90.80/10 0.081s}
h2 {+44.08/6 0.11s} 72. Qb3 {-M18/11 0.079s} Qxb3+ {+46.17/7 0.10s}
73. Kxb3 {-M14/12 0.012s} f2 {+42.40/8 0.10s} 74. Kb4 {-M10/16 0.12s}
g4 {+41.51/8 0.10s} 75. Kc5 {-M10/13 0.080s} h1=Q {+44.32/9 0.10s}
76. Kb4 {-M8/17 0.040s} Qh6 {+49.60/7 0.10s} 77. Ka4 {-M6/15 0.001s}
Qa6+ {+49.95/6 0.10s} 78. Kb3 {-M6/15 0.002s} Qc4+ {+M7/7 0.10s}
79. Kb2 {-M4/13 0s} Nd3+ {+M5/7 0.10s} 80. Ka3 {-M4/13 0s} Qb4+ {+M3/7 0.099s}
81. Ka2 {-M2/1 0s} Qb2# {+M1/7 0.099s, Black mates} 0-1[/pgn]

[DreamerExx]

And again
[pgn][Event "960teest"]
[Site "?"]
[Date "2026.06.21"]
[Round "9"]
[White "Ember"]
[Black "Houdini"]
[Result "1-0"]
[FEN "qbnrknbr/pppppppp/8/8/8/8/PPPPPPPP/QBNRKNBR w KQkq - 0 1"]
[GameDuration "00:00:27"]
[GameEndTime "2026-06-21T19:26:36.121 RTZ 2 (зима)"]
[GameStartTime "2026-06-21T19:26:08.333 RTZ 2 (зима)"]
[PlyCount "163"]
[SetUp "1"]
[TimeControl "8+0.08"]
[Variant "fischerandom"]

1. d4 {+0.48/11 0.32s} f6 {+0.15/13 0.38s} 2. f3 {+0.29/14 0.31s}
c6 {+0.06/12 0.32s} 3. Bf2 {+0.34/12 0.30s} h5 {+0.24/11 0.15s}
4. e4 {+0.86/11 0.29s} h4 {+0.36/10 0.15s} 5. Ne3 {+1.52/12 0.29s}
Bf4 {+0.33/10 0.30s} 6. Nd3 {+2.05/12 0.28s} g5 {+0.13/12 0.48s}
7. O-O {+2.03/11 0.28s} Qb8 {+0.47/9 0.14s} 8. e5 {+2.12/12 0.27s}
fxe5 {+0.41/11 0.55s} 9. dxe5 {+2.84/12 0.26s} h3 {-0.46/12 1.4s}
10. g3 {+3.33/11 0.26s} Bxe3 {-1.05/13 0.94s} 11. Bxe3 {+5.79/13 0.25s}
Ne6 {-1.09/12 0.34s} 12. c4 {+4.75/12 0.25s} b5 {-0.99/11 0.11s}
13. c5 {+5.14/12 0.24s} Bh7 {-1.05/11 0.28s} 14. b3 {+4.95/11 0.24s}
Rg8 {-1.12/11 0.37s} 15. b4 {+6.64/11 0.23s} Qc7 {-1.12/11 0.33s}
16. Qc3 {+6.64/11 0.23s} a6 {-1.42/12 1.1s} 17. a3 {+7.64/9 0.22s}
Rf8 {-1.67/12 0.85s} 18. Rde1 {+7.84/9 0.22s} Qb8 {-1.29/11 0.21s}
19. Qd2 {+8.41/10 0.21s} Rg8 {-1.53/11 0.26s} 20. Qc3 {+6.81/9 0.21s}
Rf8 {-0.13/18 0.11s} 21. Qc1 {+8.28/10 0.20s} a5 {-1.73/12 0.80s}
22. Bxg5 {+8.52/10 0.20s} a4 {-1.85/10 0.15s} 23. Bd2 {+9.17/8 0.20s}
Nd4 {-1.96/10 0.087s} 24. Bh6 {+10.60/9 0.19s} Rf7 {-1.77/10 0.081s}
25. Qe3 {+10.04/9 0.19s} Nf5 {-2.19/11 0.082s} 26. Qd2 {+9.40/10 0.19s}
Nd4 {-2.06/11 0.078s} 27. f4 {+10.04/9 0.18s} e6 {-2.12/10 0.083s}
28. Qb2 {+9.67/11 0.18s} Nb3 {-2.42/12 0.077s} 29. Bg5 {+8.96/9 0.18s}
Ne7 {-2.49/12 0.078s} 30. Nf2 {+6.76/9 0.17s} Bxb1 {-2.61/12 0.082s}
31. Rxb1 {+7.07/10 0.17s} O-O-O {-2.82/12 0.082s} 32. Rbd1 {+7.40/11 0.17s}
Rdf8 {-2.10/10 0.056s} 33. Bxe7 {+7.18/11 0.17s} Rxe7 {-2.76/12 0.10s}
34. Nxh3 {+7.77/11 0.16s} Kc7 {-2.80/11 0.080s} 35. Ng5 {+8.71/6 0.16s}
Qe8 {-3.01/11 0.080s} 36. Qe2 {+8.29/6 0.16s} Qg6 {-3.16/11 0.081s}
37. Qd3 {+9.90/6 0.15s} Qg7 {-2.93/11 0.081s} 38. h4 {+9.99/6 0.15s}
Rh8 {-2.88/10 0.080s} 39. Kh1 {+9.90/6 0.15s} Kc8 {-2.56/9 0.087s}
40. Kg2 {+9.33/7 0.15s} Rh6 {-3.08/10 0.074s} 41. Rh1 {+10.23/8 0.15s}
Qf8 {-3.52/10 0.079s} 42. Rhf1 {+10.13/6 0.14s} Qg7 {-0.11/25 0.047s}
43. Rh1 {+10.44/6 0.14s} Qf8 {-0.11/26 0.094s} 44. Rdf1 {+9.84/6 0.14s}
Rg7 {-3.48/10 0.10s} 45. Rf3 {+8.76/6 0.14s} Qh8 {-3.13/9 0.077s}
46. Re3 {+8.80/7 0.14s} Rh5 {-2.90/10 0.081s} 47. Qd1 {+9.57/7 0.14s}
Kc7 {-3.23/10 0.079s} 48. Rf3 {+9.57/5 0.13s} Rh6 {-3.47/11 0.081s}
49. Rd3 {+9.27/6 0.13s} Qd8 {-3.37/11 0.079s} 50. Qe1 {+9.53/5 0.13s}
Qa8 {-3.45/10 0.081s} 51. Qe4 {+9.53/6 0.13s} Qe8 {-3.45/10 0.080s}
52. Qe1 {+9.53/6 0.13s} Qa8 {-0.11/19 0.047s} 53. Rd6 {+9.45/6 0.13s}
Qf8 {-3.53/11 0.11s} 54. Qe4 {+9.19/5 0.13s} Re7 {-3.69/10 0.082s}
55. Rhd1 {+11.48/4 0.12s} Qe8 {-4.88/11 0.080s} 56. Qd3 {+10.36/5 0.12s}
Rh8 {-5.40/12 0.081s} 57. Ne4 {+10.79/5 0.12s} Qf7 {-5.73/12 0.081s}
58. Nf6 {+11.96/5 0.12s} Kb7 {-6.13/12 0.078s} 59. Rxd7+ {+13.81/8 0.12s}
Rxd7 {-6.13/12 0s} 60. Qxd7+ {+13.81/10 0.12s} Qxd7 {-6.50/13 0.15s}
61. Rxd7+ {+14.16/10 0.12s} Kc8 {-6.83/13 0.086s} 62. Rd6 {+14.51/8 0.11s}
Kc7 {-6.53/12 0.081s} 63. Rxe6 {+15.46/8 0.11s} Nd4 {-7.20/12 0.084s}
64. Re7+ {+16.32/8 0.11s} Kc8 {-7.47/12 0.078s} 65. Rf7 {+17.16/8 0.11s}
Ne6 {-7.12/11 0.080s} 66. Kf3 {+18.29/7 0.11s} Rd8 {-6.52/9 0.080s}
67. h5 {+19.64/7 0.11s} Nd4+ {-7.64/10 0.081s} 68. Kg4 {+23.74/10 0.11s}
Rh8 {-9.03/12 0.078s} 69. Kg5 {+23.72/9 0.11s} Ne2 {-9.97/12 0.085s}
70. e6 {+30.04/10 0.11s} Nd4 {-17.94/12 0.076s} 71. e7 {+31.54/9 0.10s}
Ne6+ {-26.59/12 0.081s} 72. Kf5 {+31.96/7 0.10s} Nd4+ {-21.45/12 0.066s}
73. Ke5 {+32.53/7 0.10s} Nf3+ {-M18/20 0.091s} 74. Kd6 {+38.70/9 0.10s}
Nd4 {-M16/20 0.021s} 75. Rf8+ {+41.00/10 0.10s} Kb7 {-M14/22 0.052s}
76. Rxh8 {+41.81/10 0.10s} Nf5+ {-M12/20 0.008s} 77. Kd7 {+42.00/12 0.10s}
Ng7 {-M10/19 0.008s} 78. e8=Q {+M9/11 0.10s} Nxe8 {-M8/17 0.003s}
79. Nxe8 {+M7/13 0.10s} Ka6 {-M6/15 0s} 80. Kxc6 {+M5/11 0.099s}
Ka7 {-17.06/1 0s} 81. Nd6 {+M3/11 0.099s} Ka6 {-M2/1 0s}
82. Ra8# {+M1/12 0.098s, White mates} 1-0[/pgn]

[DreamerExx]

Finally, a custom NNUE for Ember is ready. Previously, I used the one from the Coda engine, but now I've trained a custom one that's just as good as the previous one in tests. A new version with a custom NNUE and improved performance will be released soon.