Flux Chess

History

version 2.2 (04.08.2007)

• Improved several internal data structures to speed up search
• Improved memory management
• Improved time management and pondering
• Improved game phase recognition
• Changed maximum output depth from 256 to 64 to work around a limitation in polyglot
• Changed extension handling to speed up search
• Fixed a race condition with UCI stop command
• Fixed several small bugs

version 2.1 (27.06.2007)

• Fixed major bug in time management
• Added UCI searchmoves
• Changed eval

version 2.0 (18.06.2007)

• Stable release of the 2.x series
• Added Clear Hash option
• Added multi pv output
• Added refutation output
• Changed version numbering
• Changed root move generation for multi pv output
• Changed from instable quick sort to stable insertion sort
• Changed pruning conditions
• Removed Limited Razoring
• Fixed... a lot of bugs

version II-0.9 (23.05.2007)

• Added Futility Pruning in Quiescent
• Added Mate Threat Extension
• Added more draw eval
• Improved time control
• Improved mate values in Transposition Table
• Fixed unstoppable passer eval
• Fixed race condition with pondering

version II-0.8 (11.05.2007)

• Added Late Move Reduction
• Added Pawn Hashtable
• Added Recapture Extension
• Completely revamped evaluation
• Extracting PV from search instead of the Transposition Table
• Reduced output on lower search depth
• Improved time control
• Improved search response to UCI stop command
• Changed search and pruning conditions
• Changed from Launch4j to JSmooth
• Fixed SEE with en passant moves
• Fixed deadlock in threading

version II-0.7 (22.04.2007)

• Added Static Exchange Evaluation (SEE)
• Added Futility Pruning, Extended Futility Pruning, Limited Razoring
• Added Verified Null-Move Pruning (currently disabled)
• Added Single-Response Extension
• Added Transposition Table aging
• Added Transposition Table size configuration option
• Added engine properties file
• Added UCI movestogo
• Improved checking moves in quiescent
• Changed output to send each root move

version II-0.6 (11.04.2007)

• Rewrite move and chessman representation from object to int
• Rewrite search algorithm
• Rewrite evaluation
• Rewrite move generation
• Added Internal Iterative Deepening
• Added Evaluation Table
• Added UCI seldepth
• Added Mate Distance Pruning
• Added checking moves in quiescent
• Improved threading support
• Improved UCI protocol handling
• Changed exception preconditions to assertions
• Removed Refutation Table

version II-0.5 (09.03.2007)

• Rewrite check extension
• Added pondering
• Changed move generation order
• Changed evaluation function and position values
• Removed external JAR dependencies
• Fixed thinking output
• Fixed en passant bug

version II-0.4 (06.03.2007)

• First public release
• Added Flux.ini for PolyGlot
• Added README.txt
• Added FluxII.exe
• Changed Refutation Table implementation

version II-0.3

• Changed check mate order
• Bugfix check mate/stale mate
• Added game phase recognition
• Added move number recognition
• Added double/triple pawn recognition
• Added check extension

version II-0.2

• Changed position values
• Added final statements to improve speed
• Added Null-Move Forward Pruning
• Changed Refutation Table implementation

version II-0.1

• Changed board representation to 0x88
• Added en passant move generation
• Added Perft tests
• Changed time control
• Added contempt factor
• Changed Transposition Table replacement scheme to "replace always"
• Added Refutation Table
• Added UCI go command time increment option
• Changed evaluation function

version 1.0

• Added array board representation
• Moved protocol communication infrastructure to own project
• Changed search algorithm
• Changed evaluation function
• Added Zobrist Code generation
• Added Transposition Table
• Added move ordering
• Added quiescent search

version 0.4

• Added centipawn calculation
• Added position values
• Added mate depth recognition
• Added FEN parsing

version 0.3

• Added castling move generation
• Added en passant move
• Added stale mate check
• Added UCI ucinewgame command

version 0.2

• Added Timer functionality
• Added UCI go command parameters
• Added UCI debug command
• Added UCI info command
• Added UCI stop command

version 0.1

• Launch4j used to build windows exe
• Prepared protocol interface for XBoard and UCI
• Board representation supports 8x8 map board