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Lozza,
a JavaScript open source chess engine and user interface by Colin Jenkins, first introduced in March 2014. To play a game of chess or to analyze a position via FEN online, Lozza requires a modern web browser since it is instantiated as web worker. As UCI engine, Lozza can be used in Windows GUIs like WinBoard or Arena via Edmund Moshammer's jsUCI tool starting with jsuci.exe lozza.js ^{[1] [2]}. Other JavaScript based UCI engines, also source-to-source compiled to JavaScript, are able to run under Lozza's web based user interface ^[3], for instance the Emscripten port of Stockfish 5, Stockfish-js ^[4].

Description

Lozza represents the board using a 12x12 mailbox array and two lists of white and black pieces. The principal variation search inside the classical iterative deepening framework features a transposition table indexed by Zobrist keys and state of the art selectivity, amongst others null move pruning, late move reductions, and IID. It has implemented the simplified evaluation function by Tomasz Michniewski ^{[5] [6]}.

See also

• Geography

Forum Posts

2014

• Lozza - A javascript UI and engine by Colin Jenkins, CCC, March 01, 2014
• Javascript chess engine using simplified eval by Colin Jenkins, CCC, September 13, 2014
• Lozza - a Javascript web based UCI engine - update v1.10 by Colin Jenkins, CCC, October 18, 2014

2015 ...

• Stockfish in Lozza UIs by Colin Jenkins, CCC, January 07, 2015 » Stockfish
• Lozza - A Javascript Engine - version 1.14 by Colin Jenkins, CCC, January 25, 2015
• Lozza website updated to 1.15 by Colin Jenkins, CCC, April 24, 2015
• Lozza 1.16 by Colin Jenkins, CCC, October 31, 2015
• Lozza v1.17 release by Colin Jenkins, CCC, July 29, 2016
• Lozza 1.18 by Colin Jenkins, CCC, April 17, 2018

External Links

Chess Engine

• Lozza - javascript chess engine
  Lozza - javascript chess engine - Help
  lozza.js
• Lozza 1.15 64-bit in CCRL 40/40

Lozza UI

• Play Lozza online
• Analyse/evaluate a FEN
• Play Stockfish under Lozza-UI online

Misc

• Lozza from Wikipedia
• Urban Dictionary: Lozza

References

1. ^ Lozza - a Javascript web based UCI engine - update v1.10 by Colin Jenkins, CCC, October 18, 2014
2. ^ Using Lozza in a standard chess UI - @op12no2
3. ^ Stockfish in Lozza UIs by Colin Jenkins, CCC, January 07, 2015
4. ^ exoticorn/stockfish-js · GitHub
5. ^ Javascript chess engine using simplified eval by Colin Jenkins, CCC, September 13, 2014
6. ^ Re: Some pages discussing practical move generation? by Colin Jenkins, CCC, July 18, 2014

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