SecondChess

SecondChess is a didactical chess engine written in C by Emilio Díaz and based on FirstChess code of Pham Hong Nguyen.

• One single C code file heavily commented, around 2000 lines
• Licensed under GPL: source available at
• Board representation: one 64 int array for pieces and one 64 int array for colors
• Addressed to programmers who want to learn how a chess engine works
• Rules Implemented: castle, en passant and promotion
• Robust move generator: al positions tested so far have been matched by secondchess
• perft function implemented
• Selectable search depth
• Simple evaluation: material + piece square tables
• Simple Alpha-Beta search + Quiescent
• Basic Xboard support

• No three moves repetition
• No 50 moves rule
• After every two sqaures pawn move an en passant square is created, most of the times unnecessarily
• No time management

• Pham Hong Nguyen, author of FirstChess
• Ron Murawski for his generous help
• Pedro Castro, author of Danasah https://sites.google.com/site/danasah/
• Graham Banks and Dusan Stamenkovic for their logos
• Tony Mokonen for his windows compilations
• Tom Kerrigan for TSCP http://www.tckerrigan.com/Chess/TSCP/
• Bruce Moreland for his site in chess computers
• The people that admin and post on talkchess.com: http://talkchess.com
• The authors of http://chessprogramming.wikispaces.com/
• Jonatan Pettersson, author of Mediocre Chess http://mediocrechess.blogspot.com.es/
• Many more…

Code available at https://github.com/pocopito/secondchess