Stockfish vs Mid-range Chess Engines (Tests by Jörn Gronemann, 2025.09.22) - surprise!

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We've got a surprise for you. Reckless 0.8.0 came out on top in our traditional Stockfish 17.1 vs. mid-range chess engine test. Obsidian dev-16.14 and Alexandria 8.1.0 JA also performed well. The latter was the only engine to win a single game against Stockfish 17.1—we'll be featuring it on our website later today.

GPU NVIDIA  RTX 3060 ti. GUI-Banksia, For Every Engine only 1 CPU and 512 Hashtables, Book - 4 GM mvs book,  6TBs.

🕒🕒Time 3'+3"   Tournament download with 630 games 
💾 All games CEDR 736.088 games download (01.09.2025)  
#chessenginesdiary


P Engine Score (Tie) +/-/=
1: Reckless 0.8.0 48.5 / 84 1981.25 (+13 -0 =71)
2: Stockfish 17.1 48.0 / 84 1952.00 (+13 -1 =70)
3: Obsidian dev-16.14 46.5 / 84 1907.50 (+10 -1 =73)
4: Alexandria 8.1.0 JA 45.5 / 84 1875.25 (+9 -2 =73)
5: PlentyChess 6.0.18 45.5 / 84 1868.25 (+8 -1 =75)
6: Integral 7.0.0-dev JA 45.0 / 84 1860.00 (+7 -1 =76)
7: Clover 9.1 JA 44.0 / 84 1807.00 (+6 -2 =76)
8: Caissa 1.23 JA 42.5 / 84 1755.75 (+4 -3 =77)
9: Berserk 20250622 42.5 / 84 1747.75 (+5 -4 =75)
10: Horsie 1.1.0 42.0 / 84 1732.25 (+5 -5 =74)
11: Stormphrax 7.0.0 JA 41.5 / 84 1719.50 (+5 -6 =73)
12: Astra 6.1.1 39.5 / 84 1657.25 (+2 -7 =75)
13: Motor 0.9.0 38.5 / 84 1573.75 (+6 -13 =65)
14: Halogen 15.0.0 35.5 / 84 1464.25 (+4 -17 =63)
15: Heimdall 1.4.1 25.0 / 84 1071.75 (+1 -35 =48)

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