v1.1.66

• Play for Win toggle now drives engine options consistently across all AI modes (including Max Thinking).\n- Helper text is compact with an expandable info tooltip (consistent help icon).\n- No engine strength changes in this release.

Scorpion v1.1.61

• Restart now auto-starts the next game across modes.\n- NNUE toggle and mix slider share a single row in the main panel.\n- Restart is available in both Essentials and Advanced panels.\n- NNUE remains OFF by default.

v1.1.60

• Experimental NNUE toggle (Max only) with mix slider; NNUE remains OFF by default.\n- Root drawish repetition guardrail to reduce shuffle loops.\n- NNUE worker weight loading support (no activation by default).

Scorpion Chess Engine v1.1.59

• MaxThinking time budget fixed (now uses the Max budget)
• Hard/Max time-safety guardrails (deadline buffer + frequent stop checks)
• NNUE scaffolding/tooling retained; NNUE remains OFF by default

Scorpion v1.1.58

Phase 8 merged with NNUE off by default.

• Defensive search improvements (in-check + forced recapture extensions; recapture-first ordering).
• NNUE scaffolding + annotation/dataset/training tooling added.
• NNUE activation wiring fixes (nnueMix propagation, worker loading support).
• NNUE remains OFF by default (future MaxThinking-only experiments).

v1.1.57

• Phase 5.1c: queen-gated king safety evaluation (ring attack penalty).
• Improved SF500 tracking rung behavior (avg plies up vs baseline).
• Hard default movetime now 1000ms (was 800ms).

v1.1.56

• Phase 5.1c queen-gated king safety evaluation (ring attack penalty).\n- Improved average plies in the SF500 tracking rung without changing time controls.

v1.1.55

[1.1.55] - 2025-12-30

Changed

• Phase 4.3 search improvements: repetition defense when losing, in-check ordering, and mate-distance preference.
• Benchmark infrastructure stabilization (Stockfish ladder support, timeout tolerance, UTC+ET reporting).
• Phase 4.4 check-extension experiments (4.4.2/4.4.2b) archived and reverted after regression in SF500 b25 tracking.
• Confirmed stable baseline vs Stockfish SF500 (Hard 800ms vs SF500 b25 reconfirmation).
• Update the in-UI version label to v1.1.55.

v1.1.54

Scorpion Chess Engine v1.1.54

• UI footer version label: v1.1.54.
• Benchmark harness: add --stockfishMovetime for ladder rungs; bench-only timeout tolerance +25ms applied to both engines.
• Benchmark docs: ladder usage/runId conventions and ET timestamps in reports.

v1.1.53

• Search/eval improvements (Hard/Max).\n- Hard micro-quiescence + small TT; forcing extensions.\n- Updated Analyzer link to Scorpion Chess Game Analyzer (Base44).\n- Benchmarks will be published separately.