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Defenchess,
a UCI compliant open source chess engine by Can Cetin and Dogac Eldenk, written in C++ and licensed under the GPL 3. Formerly dubbed SCTR released in September 2017 ^[1] , it was renamed ^[2] in advance to its participation of the 4th division in TCEC Season 11 ^[3]. As a surprise, the newcomer convincingly won the TCEC Season 11 4th division ^[4]. During the TCEC Season 11, 3rd division, the Defenchess Bitbucket link lost power ^[5] and the project was apparently retreated ^{[6] [7]} .

Features

Board Representation

• Bitboards
• Magic Bitboards

Search

• Lazy SMP
• Principal Variation Search
• Transposition Table
• Selectivity
  • Razoring
  • Futility Pruning
  • Quiescence Search
  • Delta Pruning
  • Null Move Pruning
  • Late Move Reductions
• Move Ordering
  • Hash Move
  • Internal Iterative Deepening
  • Countermove Heuristic
  • Killer Heuristic
  • MVV/LVA
  • Static Exchange Evaluation

Evaluation

• Tapered Eval
• Material
• Piece-Square Tables
• Mobility
• Rooks on (Semi) Open Files
• Pawn Structure
  • Pawn Hash Table
  • Backward Pawn
  • Doubled Pawn
  • Isolated Pawn
  • Passed Pawn
• King Safety
  • Attacking King Zone
  • Pawn Shelter

Forum Posts

• Re: updates chess engines by Tony Mokonen, CCC, September 15, 2017
• SCTR 1.1d win64 by Norbert Raimund Leisner, CCC, November 30, 2017
  Re: SCTR 1.1d win64 by Carlos Canavessi, CCC, January 03, 2018
• SCTR by Alfred Palang, CCC, March 17, 2018

External Links

• nitro_can / Defenchess - Bitbucket (dead link)
• GitHub - Dogacel/sctr: SCTR Chess Engine (dead link)
• Defenchess at CCRL 40/4
• Defenchess wins TCEC Division 4, Chessdom, January 06, 2018 » TCEC Season 11, Fourth Division

References

1. ^ Re: updates chess engines by Tony Mokonen, CCC, September 15, 2017
2. ^ Re: SCTR 1.1d win64 by Carlos Canavessi, CCC, January 03, 2018
3. ^ TCEC Season 11 – information and participants, Chessdom, December 28, 2017
4. ^ Defenchess wins TCEC Division 4, Chessdom, January 06, 2018
5. ^ Re: SCTR 1.1d win64 by Günther Simon, CCC, January 08, 2018
6. ^ Re: SCTR by Günther Simon, CCC, March 17, 2018
7. ^ RWBC XB/UCI chronology mentions Defenchess derivative of Donna

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