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Keel-billed Toucan [1]

Tucano, (TucanoChess)
a Chess Engine Communication Protocol, and since version 8.0, UCI compliant open source engine under the GPL written by Alcides Schulz in C. Tucano was first released in September 2012 [2].


Bitboard Infrastructure

Tucano's bitboard infrastructure favors memory versus computation, with the option to gain some linear speedup if that becomes a bottleneck, i.e. using specific processor instructions. However, on recent Intel processors with huge caches, this might be rather insignificant concerning the strength of the engine. Tucano uses magic bitboards to determine sliding piece attacks.


Tucano's search applies PVS alpha-beta with transposition table inside an iterative deepening framework without aspiration windows. Since version 7.00, Tucano performs Lazy SMP using a shared hash table [3].


The evaluation features most common terms [4] with speculative calculation and aggregation of opening and endgame scores. The final score is interpolated by game phase within a tapered evaluation, with an additional draw adjustment in pawnless endgames.


See also

Forum Posts

External Links

Chess Engine



  1. Keel-billed Toucan (also known as Sulfur-breasted Toucan and the Rainbow-billed Toucan) Faunia, Madrid, Spain, Photo by Raúl Hernández González, April 23, 2009, Wikimedia Commons
  2. Tucano chess engine 1.00 by Alcides Schulz, CCC, September 09, 2012
  3. Tucano 7.00 Release - SMP version by Alcides Schulz, CCC, December 16, 2017
  4. Eval development: is it better to tune or add new terms? by Alcides Schulz, CCC, March 17, 2013

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