DreamerExx v2 - a new UCI engine

[DreamerExx]

Hi everyone,

I'd like to introduce my chess engine: DreamerExx v2.

Features:
- Classical alpha-beta search with iterative deepening
- Transposition table
- Quiescence search (4 half-moves)
- Killer moves & history heuristic
- Opening book (~50 lines)
- Adaptive depth (up to 7 in middlegame)

Estimated strength: idk (He beat Maia9 always)

Download: [https://github.com/ExxDreamerCode/chess ... g/engineV2]

UCI commands: fully supported (uci, isready, position, go, stop)

Author: Dreamer_Exx

Any feedback is welcome!

[Sylwy]

Hi everyone,

I'd like to introduce my chess engine: DreamerExx v2.

Features:
- Classical alpha-beta search with iterative deepening
- Transposition table
- Quiescence search (4 half-moves)
- Killer moves & history heuristic
- Opening book (~50 lines)
- Adaptive depth (up to 7 in middlegame)

Estimated strength: idk (He beat Maia9 always)

Download: [https://github.com/ExxDreamerCode/chess ... g/engineV2]

UCI commands: fully supported (uci, isready, position, go, stop)

Author: Dreamer_Exx

Any feedback is welcome!

THANK YOU ! Added to my tournament PYTHON_1st_League_2026. You can see the results here:

viewtopic.php?p=992921#p992921

[DreamerExx]

Hi everyone,

I'd like to introduce my chess engine: DreamerExx v2.

Features:
- Classical alpha-beta search with iterative deepening
- Transposition table
- Quiescence search (4 half-moves)
- Killer moves & history heuristic
- Opening book (~50 lines)
- Adaptive depth (up to 7 in middlegame)

Estimated strength: idk (He beat Maia9 always)

Download: [https://github.com/ExxDreamerCode/chess ... g/engineV2]

UCI commands: fully supported (uci, isready, position, go, stop)

Author: Dreamer_Exx

Any feedback is welcome!

THANK YOU ! Added to my tournament PYTHON_1st_League_2026. You can see the results here:

viewtopic.php?p=992921#p992921

Wow, I wrote an engine in 3 weeks and it got somewhere, thank you!

[DreamerExx]

Hi everyone,

I'd like to introduce my chess engine: DreamerExx v2.

Features:
- Classical alpha-beta search with iterative deepening
- Transposition table
- Quiescence search (4 half-moves)
- Killer moves & history heuristic
- Opening book (~50 lines)
- Adaptive depth (up to 7 in middlegame)

Estimated strength: idk (He beat Maia9 always)

Download: [https://github.com/ExxDreamerCode/chess ... g/engineV2]

UCI commands: fully supported (uci, isready, position, go, stop)

Author: Dreamer_Exx

Any feedback is welcome!

I played a 1+1 championship between different engines, and the results were a VERY pleasant surprise. My engine is quite strong in fast control games. In blitz and rapid, almost everyone here can beat my engine, not bad.

[DreamerExx]

HE BEAT SUNFISH IN 1+1, YOOO
[pgn][Event "Python"]
[Site "?"]
[Date "2026.05.22"]
[Round "1"]
[White "DreamerExx v2"]
[Black "Sunfish"]
[Result "1-0"]
[ECO "A00"]
[GameDuration "00:02:58"]
[GameEndTime "2026-05-22T17:45:22.430 RTZ 2 (зима)"]
[GameStartTime "2026-05-22T17:42:23.628 RTZ 2 (зима)"]
[Opening "Dunst (Sleipner, Heinrichsen) Opening"]
[PlyCount "107"]
[TimeControl "60+1"]

1. Nc3 {0.00/5 1.0s} Nc6 {-0.25/6 2.0s} 2. Nf3 {0.00/5 1.3s} Nf6 {-0.05/6 1.6s}
3. d4 {0.00/5 1.7s} d5 {-0.04/6 1.8s} 4. Ne5 {0.00/5 5.3s} Bf5 {-0.03/5 1.3s}
5. Nxc6 {-0.10/5 3.8s} bxc6 {+0.11/6 1.5s} 6. e3 {0.00/5 3.5s}
Qd7 {+0.13/6 2.8s} 7. Bd3 {+0.15/4 2.0s} e6 {+0.21/6 2.0s}
8. O-O {+0.15/4 0.58s} O-O-O {+0.40/6 2.1s} 9. Bxf5 {+0.30/5 1.9s}
exf5 {+0.13/6 1.2s} 10. Bd2 {+0.30/5 1.4s} Bd6 {+0.54/6 2.0s}
11. Qe2 {+0.20/5 2.8s} Rhe8 {+0.59/6 1.8s} 12. Qd3 {+0.20/5 4.0s}
Kb8 {+0.72/6 2.5s} 13. Ne2 {+0.05/5 5.2s} Ne4 {+0.94/6 3.5s}
14. Qb3+ {-0.10/4 0.81s} Ka8 {+1.26/6 1.2s} 15. Qd3 {0.00/5 3.3s}
Nxd2 {+1.27/6 2.3s} 16. Qxd2 {-3.10/4 0.24s} Kb8 {+1.20/6 1.6s}
17. Qc3 {-0.05/5 3.1s} f6 {+1.05/6 2.6s} 18. Qb3+ {+0.20/5 2.6s}
Ka8 {+0.83/7 1.5s} 19. Qc3 {+0.30/5 3.2s} h6 {+1.08/6 1.7s}
20. Qb3 {+0.30/5 3.7s} Rb8 {+1.34/6 1.4s} 21. Qc3 {+0.35/4 0.48s}
Bb4 {+1.34/6 1.6s} 22. Qd3 {+0.40/5 3.2s} Rbd8 {+1.47/5 0.90s}
23. Ng3 {+0.35/5 3.4s} g6 {+1.06/6 0.94s} 24. Qb3 {+0.50/4 1.1s}
Bd6 {+1.14/5 0.93s} 25. Rad1 {+0.45/5 4.7s} Qf7 {+1.04/5 0.94s}
26. Qc3 {+0.50/4 0.52s} Kb7 {+0.71/7 1.4s} 27. Qb3+ {+0.50/5 1.8s}
Ka6 {+0.50/6 1.3s} 28. Rfe1 {+0.80/5 2.7s} Rb8 {+0.67/6 1.4s}
29. Qa4+ {+0.90/5 1.5s} Kb7 {+0.74/6 0.94s} 30. Ne2 {+0.55/5 4.1s}
Rbd8 {+0.81/5 1.0s} 31. Qb3+ {+0.50/5 3.4s} Ka8 {+0.52/6 1.1s}
32. Qa4 {+0.55/4 0.65s} Qd7 {+0.51/7 2.1s} 33. Qb3 {+0.50/4 0.63s}
Rb8 {+0.60/6 0.90s} 34. Qa4 {+0.60/4 0.70s} Rb4 {+2.06/6 1.4s}
35. Qa3 {+0.55/4 0.42s} Rb6 {+2.02/4 0.86s} 36. Qa4 {+0.45/5 3.6s}
Rxb2 {+2.09/6 2.0s} 37. Nf4 {-0.65/4 0.72s} Bxf4 {+2.07/6 2.6s}
38. exf4 {-1.85/4 0.19s} Rxe1+ {+1.91/7 2.2s} 39. Rxe1 {-5.50/4 0.12s}
a6 {+1.21/5 0.79s} 40. Qxa6+ {-0.50/4 0.22s} Kb8 {-0.15/7 0.77s}
41. Qa3 {+0.85/5 2.2s} Rb6 {-12.74/7 0.84s} 42. Qf8+ {+0.95/4 0.23s}
Kb7 {-0.49/7 2.7s} 43. Qxh6 {+1.05/4 0.37s} Qf7 {+0.35/7 1.7s}
44. a4 {+2.10/5 1.4s} Rb2 {+0.45/7 1.5s} 45. c3 {+2.35/5 1.4s}
Rc2 {+0.40/6 0.73s} 46. Qh3 {+2.15/4 0.27s} Ra2 {+0.38/6 1.2s}
47. Qe3 {+2.20/5 1.1s} Rxa4 {+0.48/7 0.75s} 48. Qd3 {+0.55/5 1.3s}
Ra3 {+0.58/6 1.3s} 49. Rb1+ {+0.55/5 1.1s} Ka8 {+0.67/7 1.1s}
50. Qc2 {+0.50/4 0.23s} Qe7 {+0.42/6 0.77s} 51. Qb2 {+0.50/5 2.7s}
Rb3 {-9.84/7 0.92s} 52. Qxb3 {+0.40/4 0.13s} Qb4 {-507.10/7 0.89s}
53. Qxb4 {+8.45/4 0.14s} g5 {-507.10/7 1.7s} 54. Qa5# {White mates} 1-0
[/pgn]

[DreamerExx]

The final standings after 30 matches. I'm happy with the result.
My engine beat Sunfish once.
Here's the full PGN for the entire tournament:

[DreamerExx]

I decided that making DreamerExx_V3 in Python doesn't make any sense. It would take a lot of effort to make even a slightly better game. I started rewriting my engine in C++. If I finish it, I'll release it under a different name on my GitHub (and maybe I'll post it here).

[DreamerExx]

I changed my mind about rewriting the engine in C++, I realized that I don’t have the necessary skills, but I’m already working on DreamerExx v3. According to preliminary tests, it will be several times stronger than the second part. It has already won Endamat and Sunfish before my eyes. I need to do some more calibration and DreamerExx v3 will be ready in a few days.

[DreamerExx]

It's just wild what kind of machine I created