Lyudmil Tsvetkov, a Bulgarian former diplomat [1], chess player [2] and computer chess expert and author. In 2010, Lyudmil Tsvetkov published a Little Chess Evaluation Compendium elaborating on quantitative evaluation features in chess [3], in 2012 an Addendum, both hosted by Thomas Mayer. Not a chess programmer himself, Lyudmil contributed in CCC and kept developers and test departments busy in pointing out certain weaknesses of engines with the proposal of pattern and concrete weights concerning evaluation, often controversial discussed with non-orthogonality as essence of his critics, as summarized by Louis Zulli [4].
Lyudmil Tsvetkov [5]

Photos

Receiving the cup at an event of the chess section at the Bulgarian Ministry of Foreign Affairs, early 2007

Selected Publications

2010 ...

• Lyudmil Tsvetkov (2010). Little Chess Evaluation Compendium. 2010 pdf
• Lyudmil Tsvetkov (2012). An Addendum to a Little Chess Evaluation Compendium.
  Addendum June 2012 pdf
  Addendum 2 September 2012 pdf
  Addendum 3 September 2012 pdf
  Addendum 4 November 2012 pdf
  Addendum 5 November 27, 2012 pdf
  Addendum 6 December 03, 2012 pdf
• Lyudmil Tsvetkov (2012). Little Chess Evaluation Compendium. July 2012 pdf ^[6], December 03, 2012 pdf ^[7]

2015 ...

• Lyudmil Tsvetkov (2017). The Secret of Chess. amazon ^{[8] [9]}
• Lyudmil Tsvetkov (2017). Pawns. amazon
• Lyudmil Tsvetkov (2017). Human Versus Machine: How To Beat Stockfish and Komodo Part I. amazon ^[10]
• Lyudmil Tsvetkov (2017). Human Versus Machine: How To Beat Stockfish and Komodo Part II. amazon
• Lyudmil Tsvetkov (2018). The Secret of Chess: Example Games. amazon

Forum Posts

2012

• New Installment of my Project on Chess Evaluation by Lyudmil Tsvetkov, CCC, June 16, 2012
• The same as 10 years ago by Lyudmil Tsvetkov, CCC, October 01, 2012
• Small update of the Little Compendium by Lyudmil Tsvetkov, CCC, November 01, 2012
• Post-final release of the Little Compendium by Lyudmil Tsvetkov, CCC, November 27, 2012

2013

• How do you assess this position? by Lyudmil Tsvetkov, CCC, January 14, 2013
• The two bishops are letting me down by Lyudmil Tsvetkov, CCC, January 18, 2013
• The space advantage that was non-existent by Lyudmil Tsvetkov, CCC, January 18, 2013
• Blockade by Lyudmil Tsvetkov, CCC, January 18, 2013
• Opposing the unopposed pawn by Lyudmil Tsvetkov, CCC, January 18, 2013
• The eternal knight by Lyudmil Tsvetkov, CCC, January 18, 2013 » Outposts
• On the verge of losing by Lyudmil Tsvetkov, CCC, January 18, 2013
• The backward passer by Lyudmil Tsvetkov, CCC, January 21, 2013
• First move advantage by Lyudmil Tsvetkov, CCC, June 19, 2013 » Opening, Tempo
• Safe spatial mobility by Lyudmil Tsvetkov, CCC, August 04, 2013 » Mobility
• Castling long by Lyudmil Tsvetkov, CCC, August 05, 2013 » Castling
• The worst pawn weakness by Lyudmil Tsvetkov, CCC, September 13, 2013
• Crazy theories by Lyudmil Tsvetkov, CCC, September 15, 2013
• A balanced approach to imbalances by Lyudmil Tsvetkov, CCC, October 23, 2013 » Material
• Elephantiasis: reality or myth? by Lyudmil Tsvetkov, CCC, October 28, 2013
• 2 Moves Engine Book by Lyudmil Tsvetkov, CCC, December 07, 2013 » Opening Book
• Lonely queen by Lyudmil Tsvetkov, CCC, December 15, 2013 » Material
• My Stockfish wish for 2014 by Lyudmil Tsvetkov, CCC, December 24, 2013 » Stockfish
• You are KIDding me by Lyudmil Tsvetkov, CCC, December 28, 2013 ^[11]

2014

• Crude, cruder, crudest by Lyudmil Tsvetkov, CCC, January 05, 2014 » Stockfish
• The Fried Fish Attack by Lyudmil Tsvetkov, CCC, January 10, 2014 ^[12]
• 5 underestimated evaluation rules by Lyudmil Tsvetkov, CCC, January 23, 2014
• Huge simplification by Lyudmil Tsvetkov, CCC, April 25, 2014 » Stockfish, Pawn chain
• What is a backward pawn? by Lyudmil Tsvetkov, CCC, May 12, 2014 » Backward Pawn, Backward Pawns (Bitboards)
• The phalanx concept by Lyudmil Tsvetkov, CCC, May 21, 2014 » Duo Trio Quart
• The Superfinal by Lyudmil Tsvetkov, CCC, May 21, 2014 » TCEC Season 6 - Superfinal, Komodo vs. Stockfish
• Redundant knight by Lyudmil Tsvetkov, CCC, June 20, 2014
• Scaling eval with material on the board by Lyudmil Tsvetkov, CCC, June 25, 2014
• King shelter x-ray attacks by Lyudmil Tsvetkov, CCC, June 27, 2014 » King Safety, X-ray Attacks (Bitboards)
• Obligatory scaling by Lyudmil Tsvetkov, CCC, June 27, 2014 » Rook Endgame
• Heavy piece shelter by Lyudmil Tsvetkov, CCC, June 27, 2014 » King Safety

2015

• Binders by Lyudmil Tsvetkov, CCC, February 04, 2015 » Pawn Structure
• LCP by Lyudmil Tsvetkov, CCC, February 09, 2015 » Pawn chain
• En passant bonus by Lyudmil Tsvetkov, CCC, February 10, 2015 » En passant
• Pawn checks and center levers by Lyudmil Tsvetkov, CCC, February 11, 2015
• So same, so different by Lyudmil Tsvetkov, CCC, February 12, 2015 » Rook on Open File
• Kind of backward by Lyudmil Tsvetkov, CCC, February 13, 2015
• Empty! by Lyudmil Tsvetkov, CCC, February 14, 2015 » Square Control
• Double pawn push by Lyudmil Tsvetkov, CCC, February 14, 2015
• Kingside fianchetto by Lyudmil Tsvetkov, CCC, February 18, 2015 » Fianchetto
• Pawn defence by Lyudmil Tsvetkov, CCC, February 18, 2015 » Connectivity
• The strongest passer by Lyudmil Tsvetkov, CCC, February 19, 2015
• Longer chain pawn again by Lyudmil Tsvetkov, CCC, February 25, 2015 » Pawn chain
• Couple more ideas by Lyudmil Tsvetkov, CCC, April 05, 2015
• Lever evaluation by Lyudmil Tsvetkov, CCC, May 01, 2015 » Pawn Levers (Bitboards)
• Chain, duo, connected by Lyudmil Tsvetkov, CCC, May 02, 2015 » Pawn chain, Duo Trio Quart (Bitboards)
• Some more pawns by Lyudmil Tsvetkov, CCC, May 03, 2015
• Assorted tweaks by Lyudmil Tsvetkov, CCC, May 08, 2015

2016 ...

• Long-term project by Lyudmil Tsvetkov, CCC, June 05, 2016
• The Secret of Chess by Lyudmil Tsvetkov, CCC, August 01, 2017
• The Secret of Chess by Lyudmil Tsvetkov, Rybka Forum, August 02, 2017
• Human versus Machine by Lyudmil Tsvetkov, Hiarcs Forum, October 08, 2017
• Human versus Machine by Lyudmil Tsvetkov, Rybka Forum, October 08, 2017
• The Secret of Chess 2 by Lyudmil Tsvetkov, CCC, March 26, 2018

References

1. ^ Department of Foreign Affairs - New Ambassadors present Credentials
2. ^ Ludmil Tsvetkov chess games - 365Chess.com
3. ^ Lyudmil Tsvetkov (2010). Little Chess Evaluation Compendium. 2010 pdf
4. ^ Thanks by Louis Zulli, CCC, June 20, 2014
5. ^ Photos Courtesy of Lyudmil Tsvetkov
6. ^ An Update of the Addendum to the LittleCompendium by Lyudmil Tsvetkov, CCC, July 02, 2012
7. ^ Post-final release of the Little Compendium by Lyudmil Tsvetkov, CCC, November 27, 2012
8. ^ The Secret of Chess by Lyudmil Tsvetkov, CCC, August 01, 2017
9. ^ The Secret of Chess? - Review by David Smerdon, December 03, 2017
10. ^ Human versus Machine by Lyudmil Tsvetkov, Hiarcs Forum, October 08, 2017
11. ^ King's Indian Defence from Wikipedia
12. ^ Two Knights Defense, Fried Liver Attack - Wikipedia

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