Brahma

Brahma is a UCI/Xboard-compliant chess engine written in C++14.

Engine strength

Brahma is currently in development. This section will be updated once the engine is in alpha.

Implementation

Board representation

• Bitboards
• Fancy magic bitboards for a 4.5s PERFT 6 @ 3.81 GHz (no bulk counting)

Search

• Lazy SMP (up to 128 threads)
• Iterative Deepening
• Fail-Hard Principal Variation Search
• Transposition Table
  • Zobrist Hashing
  • Two Bucket System
• Selectivity
  • Adaptive Null Move Pruning
  • Late Move Reductions
  • Futility Pruning
  • Razoring
  • Move Count Based Pruning
  • Check Extensions
  • Singular Extensions
• Quiescence Search
  • Captures
  • Queen Promotions
  • Checks on the first 3 plies
• Move Ordering
  • Internal Iterative Deepening
  • Static Exchange Evaluation
  • MVV/LVA to order captures
  • Killer Heuristic (for quiet moves)
  • History Heuristic (for quiet moves)

Evaluation

• Evaluation Cache
• Piece-Square Tables
• King Safety
• Pawn Structure
• Mobility
• SWAR Tapered Evaluation
• Texel's Tuning Method
• Reinforcement learning
• Coordination descent
• Syzygy tablebase support
• Basic threat detection and pressure on weak pieces