Firenzina

Firenzina [ˌfi-rɛn-ˈtsē-nə] is a free, open-source UCI chess engine by
Kranium (Norman Schmidt), Yuri Censor (Dmitri Gusev) and ZirconiumX (Matthew Brades). Firenzina is a derivative of Fire 2.2 xTreme by Kranium (Norman Schmidt).

Firenzina 2.4.3 xTreme for modern 64-bit Intel computers is now available (11/26/2014):

Sources of Firenzina 2.4.3 xTreme are now available (12/02/2014):

Firenzina 2.4.1 for Android ported by Corey Abshire is now available (08/25/2014):

Firenzina 2.4.2 xTreme for modern 64-bit Intel computers is now available (04/12/2014):

Sources of Firenzina 2.4.2 xTreme (04/12/2014) are available at the Firenzina GitHub

Firenzina 2.4.1 xTreme for modern 64-bit Intel computers is now available (01/26/2014):


Sources of Firenzina 2.4.1 xTreme (01/26/2014) are available at the Firenzina GitHub.

Firenzina 2.4 xTreme for modern 64-bit Intel computers is now available (12/15/2013):


Sources of Firenzina 2.4 xTreme (12/15/2013) are available at the Firenzina GitHub.

Firenzina 2.3.1 xTreme for modern 64-bit Intel computers is now available (5/26/2013):



Generic 64-bit Windows compiles of Firenzina 2.3.1 xTreme are also available (5/27/2013 and 6/20/2013):


Generic 32-bit Windows compiles of Firenzina 2.3.1 xTreme are available (5/28/2013):


Sources of Firenzina 2.3.1 xTreme (5/27/2013) are available at the Firenzina GitHub.
You're welcome to download sources of Firenzina 2.2.2 xTreme (3/19/2013):


You're also welcome to download an archive of 150 4/4 games played by Firenzina 2.2.2 xTreme, Stockfish 2.3.1, and IvanHoe 999946h starting from silvergambit.pgn on my Core i7 quad:

  • The number of threads was set to 8 for each engine.
  • Ponder off.
  • Large pages were enabled for Firenzina and IvanHoe.
  • RobboBases were enabled and configured for Firenzina and IvanHoe.
  1. Firenzina 2.2.2 xTreme beat IvanHoe 999946h, +19-3=28 (33:17, 66%)
  2. Stockfish 2.3.1 (Stockfish-231-64-popcnt-ja) was victorious over IvanHoe 999946h, +15-10=25 (27.5:22.5, 55%)
  3. Firenzina 2.2.2 xTreme was lucky to edge Stockfish 2.3.1, +13-10=27 (26.5:23.5, 53%)

These internal test results are posted not to make definite claims about relative strengths of chess engines, but merely to encourage others to test Firenzina some more.

Gusev Hashing

Gusev hashing is a variation of Zobrist hashing that does not need a pseudo-random generator:

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