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		Supra, (SupraChess) an UCI compliant open source chess engine by Pedro Mourão Soares Correia. This idiosyncratic, not comparable approach seems an attempt to unwind the recursive Alpha-Beta calls for apparently different deep cutoff conditions until a maximum depth of 18 (in 23.1 increased to 24), each routine instantiated maxdepth times 12 for each kind of piece, times at least two for various pruning filters - all packed in one clumsy and obfuscated, hopefully generated C++ file of 7MiB [1] full of boolean tautology expressions. The board is represented as two-dimensional 8x8 array, with 18 explicit global incarnations for the search, and a 1000x8x8 array for the game record to check for repetitions.
Wormhole [2]

Wormhole Pruning

A typical floating point deep cutoff condition, dubbed "wormhole pruning" looks like this. Alpha identifiers have even text indices, the betas odd ^[3].

if (alfa16>=beta17 || alfa14>=beta17 || alfa12>=beta17 
 || alfa10>=beta17 || alfa8 >=beta17 || alfa6 >=beta17 
 || alfa4 >=beta17 || alfa2 >=beta17 || alfa0 >=beta17 || beta17<=-MAXcut17)
{
  corte_alfa16=true;
  goto fim;
}

See also

• Chess Champion Super System III
• SuperChess
• Super Constellation

Forum Posts

• Suprachess? by Dann Corbit, CCC, January 28, 2011
• SupraChess UCI v20.1 by Norbert Raimund Leisner, January 14, 2015
• Supra Chess 23.0 x64 on ChessGUI by Norbert Raimund Leisner, CCC, July 24, 2016

External Links

Chess Engine

• Supra ^[4]
• Supra 15.0 in CCRL 40/4

Misc

• supra - Wiktionary
• supra- - Wiktionary
• super - Wiktionary
• Supra from Wikipedia
• Supra (grammar) from Wikipedia
• Super from Wikipedia

References

1. ^ wc "Supra 20.1.cpp": 278655 435536 7406164
2. ^ Exact mathematical plot of a Lorentzian wormhole (Schwarzschild wormhole), Author: AllenMcC, October 20, 2007, Wormhole from Wikipedia, Wikimedia Commons
3. ^ supra_20.1.zip\Supra 20.1\Sorce\Supra 20.1.cpp
4. ^ SupraChess UCI v20.1 by Norbert Raimund Leisner, January 14, 2015

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