I used to play at fide elo 1900 or so, one time drawing an IM at 2400+, winning and drawing some games with NM - our local National Master with fide elo rating around 2000+ and from time to time loses to a player with a rating of 1700 and below when you are out-prepared in the opening. This is my target, an engine that can play close to my rating with some positional ideas added into it. In the tactical side, I am sure the engine will be able to figure it out . Developing this engine is actually holding back all your pruning and reduction techniques. This is why this engine has no null move, no transposition table, no LMR etc. At the moment I will be concentrating on adding evaluation features to shape its style. Yesterday I let it play with Mephisto Gideon Pro a stronger engine than CDrill and found this.mar wrote:Very nice project Ferdy!
Care to explain a bit more about how you try to make CDrill play more human-like? I'm allergic to this kind of mantra but I know if you try to make something play human-like it's way more
than random tweaking of piece values.
I often play my old iOS chess app built on top of cheng3 and I have to say I messed up with difficulty scaling.
Adding noise to eval without tuning it is a disaster, I can win ~30% against "skill 99" but I only have 2 draws out of about 100 against skill 100 (full power) - my bad,
the good thing is it kills my ego
[d]rq2k2r/3pppbp/n5p1/2pP4/4P1n1/2N2N1P/PP2QPP1/R1B2RK1 b kq - 0 12
CDrill black played Bg7xc3 giving up its dark-squared bishop too early where white has a dark-squared bishop. This is one of the things that I need to teach CDrill via evaluation no to do it. Pawel also suggested some hints in another post on piece development that may look like a human is playing. But first I need to create a base line even for engine-engine records, that it is not playing too much above fide elo 2000. Kai suggested an approximation SSDF rating + 150 = fide elo, around this rating range. Also I will play myself vs CDrill at TC 15m + 5s inc/move. Not too fast and not too slow - rated match (perhaps 12 games at first), but I need to create a small random book for CDrill first. I already played it on some blitz games, and I can outplay it if I am able to launch an attack to its king. I can also out play it in ending probably because it does not have the transposition table. I am actually thinking of adding transposition table (minimal use only) eventually as its ending play is not human-like. I will found more on this later after taking some serious match with it. I don't care much if it will go down below fide elo 2000 as long as it plays like human.
That certainly is possible if just scaling down its strength.So I still think that maybe time odds scaling as I do in cheng4 is the way to go (without expensive tuning).
I am surprised to this, one time I tune it to match the moves of Morphy (later I will upload this Morphy test suite), I got a weird eval parameter values. See the CDrill site.Personalities sound really good but there's still the tweaking issue to match real strength.
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KingAttackWeight 100 ThreatWeight 100 MobilityWeight 100 MaterialWeight 100 PassedPawnWeight 100 PawnStructureWeight 100
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KingAttackWeight 10 ThreatWeight 220 MobilityWeight 190 MaterialWeight 180 PassedPawnWeight 90 PawnStructureWeight 140
Looking at the code, there was a mixed of eval features. My ThreatWeight is about attacking opp pieces anywhere on the board, and then this KingAttackWeight involves attacking opp piece near opp king, so this was double counted, the personality auto-tuner is able to figure this out
Playing the engines at blitz, the Morphy is able to score well too, and you have a completely different style of play. Morphy is too aggressive and due to its aggressiveness it was losing more.
Head to head statistics:
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1) CDrill 1800 2000.0 : 17 (+8,=3,-6), 55.9 % vs. : games ( +, =, -), (%) : Diff CDrill 1800 Morphy : 17 ( 8, 3, 6), 55.9 : +44.8 2) CDrill 1800 Morphy 1955.2 : 17 (+6,=3,-8), 44.1 % vs. : games ( +, =, -), (%) : Diff CDrill 1800 : 17 ( 6, 3, 8), 44.1 : -44.8
If you mean a book for engine, I don't have at the moment. I just plan to create a shallow and wide polyglot book.I also wanted to ask - do you have some pseudo-random book with a lot of variation?
What do you mean by big chessboard?I'm tempted to start a mini-project with big chessboard and one engine plus high-variety book,
but as usual motivation is #1 problem, though I'm tired of elo-hunting I admit
elo-hunting? forget it, just leave it to the Stockfish armies .