Obsidian 16.15 SE won the 1st Chess Engine League (May 2026 edition). Stockfish dev-20260504 took second place, while PlentyChess and Reckless tied for third and fourth. Stormphrax 7.0.0 and Lc0 0.32.1 were relegated to the second league, along with Astra 6.1.1 following a tiebreaker.
You can find more information about the CEDR Chess Engine League on the dedicated website - LEAGUE.
CEDR 871.259 games download (01.05.2026)
💾 Tournament download with 240 games + playOff
💻 Asus Zenbook, AMD Ryzen 9 6900HX, RAM 32,0 GB 🖬 GUI - Arena
#chessenginesdiary Country - Poland, City - Malbork 🕓 Time 3'+3"
| P | Engine | CEDR | Score | (Tie) | Chg | +/-/= |
|---|---|---|---|---|---|---|
| 1: | Obsidian 16.15 SE | 3742 | 16.5 / 30 | 244.75 | +0 | (+3 -0 =27) |
| 2: | Stockfish dev-20260504 | 3754 | 16.5 / 30 | 244.50 | -6 | (+3 -0 =27) |
| 3-4 | PlentyChess 7.0.65 | 3738 | 15.5 / 30 | 231.75 | -6 | (+1 -0 =29) |
| 3-4 | Reckless 0.10.0 dev-7300f044 | 3743 | 15.5 / 30 | 231.75 | -9 | (+1 -0 =29) |
| 5: | Horsie 1.1 | 3685 | 15.5 / 30 | 231.75 | +21 | (+1 -0 =29) |
| 6: | Alexandria 9.0.0 JA | 3724 | 15.5 / 30 | 231.75 | +0 | (+1 -0 =29) |
| 7: | Integral 7 dev.8bab JA | 3725 | 15.0 / 30 | 225.00 | -6 | (+0 -0 =30) |
| 8: | Berserk 20250622 | 3713 | 15.0 / 30 | 225.00 | +0 | (+0 -0 =30) |
| 9: | Rubichess 20250606 JA | 3697 | 15.0 / 30 | 224.00 | +9 | (+1 -1 =28) |
| 10-14 | Quanticade Phoenix 4.0 | 3696 | 14.5 / 30 | 217.75 | +3 | (+0 -1 =29) |
| 10-14 | Caissa 1.25 JA | 3709 | 14.5 / 30 | 217.75 | -3 | (+0 -1 =29) |
| 10-14 | Dragon 3.3 | 3711 | 14.5 / 30 | 217.25 | -3 | (+0 -1 =29) |
| 10-14 | Astra 6.1.1 | 3674 | 14.5 / 30 | 217.25 | +12 | (+1 -2 =27) |
| 10-14 | Viridithas 19.0.1 | 3706 | 14.5 / 30 | 217.25 | -3 | (+1 -2 =27) |
| 15: | Stormphrax 7.0.0 | 3693 | 14.5 / 30 | 215.50 | +3 | (+1 -2 =27) |
| 16: | Lc0 0.32.1 | 3705 | 13.0 / 30 | 196.00 | -15 | (+0 -4 =26) |
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