GC-Engine v1.2

[1.2] - 2026-01-06

Highlights

GC-Engine v1.2 is a release that focuses on improving the search power and stability of the engine with various pruning and extension technique optimizations.

✨ Added

Search Improvements

• Enhanced LMR (Late Move Reductions) - Formula Stockfish-style with dynamic adjustments
• Improved Singular Extensions - Double extensions dan multi-cut integration
• History-Based Pruning - Leaf, Counter, dan Followup history pruning
• Better Move Ordering - Continuation history (1-ply dan 2-ply)
• Multi-Cut Pruning - Depth 12+ with configurable parameters
• ProbCut - Probabilistic cutoffs for deep searches

Evaluation Enhancements

• Threats Evaluation - Detection of threats from pawns, minor pieces, and rooks
• Advanced King Safety - King ring attacks with weighted attackers
• Improved Pawn Evaluation - Candidate passed pawns, pawn duo bonus, Rule of the Square
• Minor Piece Coordination - Evaluation of knight and bishop coordination

New Features

• Dynamic Contempt - Contempt adjustment based on position
• Built-in Profiler - Performance analysis with bench command

Build System

• Profile-Guided Optimization (PGO) build support
• PEXT/BMI2 support for modern CPU (Intel Haswell+, AMD Zen 3+)
• Internal profiling build option
• Improved Makefile with multiple build targets

⚡ Changed

• Optimized search constants for balance between speed and tactical accuracy
• Improved time management with stability-based adjustment
• Better aspiration window handling
• Enhanced pondering with ponderhit support