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The simple answer is: white was already completely lost; Rf4 went from a losing position to another losing position, so not really a mistake. The longer and more technical, though also more correct an…

I somehow doubt that a chess engine developer would request a solution with "no need to use python or other technologies too much other programming." What are you developing, and how are you developin…

As thibault himself has said: "If you're not writing a homemade chess engine, or a program that plays chess, then you have no reason to make a Lichess bot account." I suggest you stop worrying about g…

There is no such thing as "points which you got in your second answer". After you've failed or completed a puzzle, you can no longer gain or lose rating from it.

Here's a guide on setting up a lichess development environment: https://github.com/ornicar/lila/wiki/Lichess-Development-Onboarding.

I think the game should have relly ended after move 59, at which point it is clear that neither side will achieve anything. That's because both sides can easily make a draw by keeping the h-pawn defen…

I can remember precisely one occasion of the LM title being withdrawn because the person who had it had misbehaved (I won't name them because that would be public shaming). Apart from that, I don't th…

In fact, the advantage of moving twice per turn is so large that some people consider this variant to be more or less fair for both sides: https://en.wikipedia.org/wiki/Monster_chess. That's double mo…

King, queen and knight versus king, rook, bishop and knight is supposedly pretty hard: https://lichess.org/analysis/8/3r4/8/6n1/5k2/1b6/3K3N/7Q_w_-_-_0_1. More than 500 moves until the first capture w…

My visualisation tends to be in 2D, which is probably because it has been a while since I saw a physical chess board. As for colors/styles, I don't really see actual images of pieces in my head. If I …