Chess System Tal 2.07 - new version chess engine
Chess-System-Tal is a UCI chess engine written in C++ by Chris Whittington and Ed Schröder.
Rating Chess Engines Diary CEDR=3635
Chess System Tal 2.07 what's new?
Chess System Tal 2.07 — public release. Self-contained Windows x64 builds (NNUE net embedded; just run the .exe). Two playing styles, each in AVX2 and AVX-512, plus a scalar build (runs on any x86-64 CPU) for older PCs without AVX2.
Elo-optimised (net E1019) — strongest play:
CSTal-2.07-E1019-AVX2.zip — runs on all modern x64 CPUs (AVX2).
CSTal-2.07-E1019-AVX512.zip — faster on AVX-512 CPUs (recent AMD Zen4+ / Intel); will not run without AVX-512.
Tal-style / EAS (net E1162) — sacrificial, attacking play (Stefan Pohl EAS metric):
CSTal-2.07-E1162-EAS-AVX2.zip — AVX2.
CSTal-2.07-E1162-EAS-AVX512.zip — AVX-512 only.
Pick AVX2 if unsure. All builds embed their net — no separate files needed.
Experimental nets — for wild, sacrificial and crazy play (now in AVX2 and AVX-512):
CSTal-2.07-cst-absurd-AVX2.zip / CSTal-2.07-cst-absurd-AVX512.zip — wild, materially-reckless play.
CSTal-2.07-cst-extreme-AVX2.zip / CSTal-2.07-cst-extreme-AVX512.zip — purposeful and determined play, in the tradition of the old masters.
These builds sacrifice strength for a great style of play.
Scalar (no-AVX) builds — for older PCs without AVX2: run on any x86-64 CPU, one per net. They play identically to the AVX2 builds (same moves and evaluation), just slower (roughly 4–5×). Only use these if an AVX2 build won't start.
CSTal-2.07-E1019-scalar.zip, CSTal-2.07-E1162-EAS-scalar.zip, CSTal-2.07-cst-absurd-scalar.zip, CSTal-2.07-cst-extreme-scalar.zip.
New in 2.07
New scalar (no-AVX) builds for every net — run on any x86-64 CPU, for older PCs without AVX2. Verified bit-identical play to the AVX2 builds, just slower.
The Extreme and Absurd builds now ship in both AVX2 and AVX-512 (previously AVX2 only).
Fixed a per-go memory leak in single-threaded search: an orphaned timer thread leaked roughly one thread stack per search (~40 KB/search), reclaimed only at process exit. Long single-thread analysis and batch runs no longer grow unbounded.
Lighter default footprint for high-concurrency use: default Hash reduced 256 MB → 32 MB, the Threads option is clamped to the machine's logical-processor count (no oversubscription), and the Hash floor now matches the advertised 16 MB minimum. Match managers / GUIs that set Hash and Threads explicitly are unaffected.
Chess System Tal 2 vs. other engines:
| Ethereal 14.25 | 162.5/359 | -34 | 359 Games |
| RubiChess 20240112 | 114/235 | -7 | 235 Games |
| Berserk 13 | 97/234 | -40 | 234 Games |
| Seer 2.8.0 | 99.5/197 | +2 | 197 Games |
| Koivisto 9.2 | 85.5/151 | +20 | 151 Games |
| Alexandria 7.0.0 | 60/143 | -23 | 143 Games |
| RofChade 3.1 | 71.5/140 | +3 | 140 Games |
| Obsidian 13.0 | 52.5/121 | -16 | 121 Games |
| PlentyChess 3.0.0 | 52/121 | -17 | 121 Games |
| Uralochka 3.41a JA | 57.5/116 | -1 | 116 Games |
| Caissa 1.18 | 49/105 | -7 | 105 Games |
| Titan 1.1.0 | 52/104 | +0 | 104 Games |
| Rebel 16.3 | 51/99 | +3 | 99 Games |
| Dragon 3.3 | 38/97 | -21 | 97 Games |
| Berserk 12.1 | 37.5/96 | -21 | 96 Games |
| Obsidian 12.0 | 38/88 | -12 | 88 Games |
| RubiChess 20230918 | 40.5/86 | -5 | 86 Games |
| Clover 6.1 | 45/85 | +5 | 85 Games |
| PlentyChess 1.0.0 | 37/84 | -10 | 84 Games |
| Revenge 3.0 | 42.5/78 | +7 | 78 Games |
| Igel 3.5.0 | 42/78 | +6 | 78 Games |
| Caissa 1.20 | 31/77 | -15 | 77 Games |
| Titan 1.0.0 | 35/68 | +2 | 68 Games |
| RubiChess 20240817 | 28.5/68 | -11 | 68 Games |
| Alexandria 6.1.0 | 31/67 | -5 | 67 Games |
| Uralochka 3.40a | 32/64 | +0 | 64 Games |
| Peacekeeper 3.01 | 31/59 | +3 | 59 Games |
| Lizard 10.5 | 27.5/59 | -4 | 59 Games |
| Stormphrax 4.0.0 | 37.5/56 | +19 | 56 Games |
| Rebel EAS | 28/56 | +0 | 56 Games |
| Motor 0.7.0 | 25.5/53 | -2 | 53 Games |
| Clover 6.1.19 | 27/52 | +2 | 52 Games |
| Caissa 1.19 | 23/52 | -6 | 52 Games |
| Uralochka 3.41 dev3 | 26/51 | +1 | 51 Games |
| Clover 6.2 | 26/50 | +2 | 50 Games |
| Starzix 6.0 | 24.5/50 | -1 | 50 Games |
| Viridithas 12.0.0 | 26/47 | +5 | 47 Games |
| Arasan 24.0 | 27/46 | +8 | 46 Games |
| Uralochka 3.41 dev1 | 26/46 | +6 | 46 Games |
| Caissa 1.21 | 19.5/46 | -7 | 46 Games |
| Stormphrax 6.0.0 | 18/46 | -10 | 46 Games |
| Lizard 10.4 | 22/44 | +0 | 44 Games |
| Velvet 7.3.0 | 25/42 | +8 | 42 Games |
| Viridithas 13.0.0 | 22.5/42 | +3 | 42 Games |
| Obsidian 10.0 | 21/42 | +0 | 42 Games |
| Caissa 1.16 | 21/42 | +0 | 42 Games |
| Viridithas 14.0.0 | 21.5/41 | +2 | 41 Games |
| Booot 7.2 | 25.5/40 | +11 | 40 Games |
| Viridithas 11.0.0 | 24.5/40 | +9 | 40 Games |
| Clover 6.0 | 23.5/40 | +7 | 40 Games |
| Alexander 1.3 | 23.5/38 | +9 | 38 Games |
| Slowchess 2.9 | 22.5/38 | +7 | 38 Games |
| Clover 6.1.2.4 JA | 21.5/38 | +5 | 38 Games |
| Velvet 8.1.1 JA | 19/38 | +0 | 38 Games |
| Velvet 8.0.0 | 18.5/38 | -1 | 38 Games |
| Motor 0.8.0 JA | 18/38 | -2 | 38 Games |
| Seer 2.7.0 | 19.5/36 | +3 | 36 Games |
| Obsidian 9.0 | 19/36 | +2 | 36 Games |
| Vafra 14.12.1 Stockfish | 18/36 | +0 | 36 Games |
| Clover 7.0 JA | 16/36 | -4 | 36 Games |
| Stormphrax 1.0.0 | 21.5/35 | +8 | 35 Games |
| Rebel 16.2 | 18.5/34 | +3 | 34 Games |
| Alexandria 5.1.0 | 17/32 | +2 | 32 Games |
| Caissa 1.17 | 12.5/32 | -7 | 32 Games |
| Fritz 19 | 21/30 | +12 | 30 Games |
| Akimbo 1.0.0 | 19/30 | +8 | 30 Games |
| Minic 3.41 | 19/30 | +8 | 30 Games |
| Black Marlin 9.0 | 18/30 | +6 | 30 Games |
| Caissa 1.13.1 | 17.5/30 | +5 | 30 Games |
| Viridithas 15.0.0 | 14/30 | -2 | 30 Games |
| Obsidian 12.29 | 11/30 | -8 | 30 Games |
| Clover 7.1 JA | 15/29 | +1 | 29 Games |
| Carp 3.0.1 | 19.5/28 | +11 | 28 Games |
| Starzix 5.0 | 13.5/28 | -1 | 28 Games |
| Clover 8.1 JA | 12/28 | -4 | 28 Games |
| Booot 7.3 | 16.5/26 | +7 | 26 Games |
| Caissa 1.15 | 12.5/26 | -1 | 26 Games |
| Clover 8.0.1 | 12.5/26 | -1 | 26 Games |
| Alexandria 7.1.0 | 10/26 | -6 | 26 Games |
| Peacekeeper 3.00 | 14/24 | +4 | 24 Games |
| Lizard 11.2 | 9.5/24 | -5 | 24 Games |
| Patricia 3.1 | 21/23 | +19 | 23 Games |
| Altair 7.0.3 | 15/23 | +7 | 23 Games |
| Texel 1.11 | 15.5/22 | +9 | 22 Games |
| Alexandria 5.0.0 | 11.5/22 | +1 | 22 Games |
| Obsidian 11.0 | 10.5/22 | -1 | 22 Games |
| Lizard 11.1 | 9.5/22 | -3 | 22 Games |
| Integral v6 | 9/22 | -4 | 22 Games |
| SugaR AI SE | 7.5/22 | -7 | 22 Games |
| Willow 4.0 | 15.5/20 | +11 | 20 Games |
Chess System Tal 2.07 download
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