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Depend on hardware and time control. Depends on time control and opponent's approach to weakening. Weak levels of Rodent run at low nodes per second, therefore should be the same across wide range of hardware (as long as you don't run it on a washing machine). But if other engine approximates elo b...

Moron 0.9 played 1.Qf2. Glad it has been fixed.

Psion Chess by Richard Lang (https://www.retrogames.cz/play_430-DOS.php) I played a lot of games against it as a boy, and over the course of one summer holiday proceeded from losing at level one to winning at next-to-last level. I remember the engine as very stable, level-headed opponent. Also, it d...

My private, unfinished engine, slightly weaker than Rodent and therefore unlikely to be released anytime soon, gets it at depth 6 and sticks to it. Reaching non-negative score requires depth 23. FEN: 1r2r1k1/p4ppp/3b1q2/1p1P3P/2p2P2/3nPB2/PP4Q1/1KBR3R w - - 0 1 Meander: 1 00:00 58 0 -2.45 Kb1-a1 Nd3...

I have always wondered why chess players for the most part, is so reluctant and hesitant when it comes to variants and more complex forms of chess. I can reply for myself. Chess has its lore, its tradition, learning materials, famous games to behold. It has also a kind of balance shaped over the ce...

I've got a different idea. Since players seem to accept and embrace armageddon in its current form, and even base their match strategies on its existence, then armageddon should be made maximally unpleaseant. Rapid and blitz is oh, huh? Then decide playoffs with games using doubled, then quadrupled ...

One good way of telling about CMH is what Lucas said: it is basically local history table. The other way goes as follows: first you notice that certain moves tend to be refuted by the exact same move, so you create a table indexed by coordinates of a refuted move, save the refutation there and upon ...

If human matches were organised the way you organise Stockfish-Mephisto matches, one opponent would have an incompatibile liver transplant, and the other an axe in his head.

many programmers often speak out : why should I put knowledge into my programs when throwing knowledge out gives more ELO Encoding human knowledge in the engine is the polar opposite of imbuing engine with chess knowledge. Throughout the years, I developed a way of parametrising engine to play like...

Ugly is to burn resources for beeing lazy in programming. No. Ugly is to write expert system with layer upon layer of code to handle corner cases, only to be asked "but why placing a rook on a closed file when there is enemy queen on the same file plus a chance for a pawn break is considered less i...