The problem is that this is neither checkers nor chess, the most common basic board games that do not involve cards you find online. Who ever hears, 'oh look at this draughts game I played'?! I get …

Kalnap I have one more trap on those who loves to repeat:) https://lidraughts.org/EdrXiif5

+ I included a similar example in my studies, and you can check how does evaluation work: https://lidraughts.org/study/6KiWap9p

By the way, only few of draughts engines allow to run the retrograde analysis: good example is Aurora Borealis.

Wow good point. When I enter the game in the phone it's opening on the position after last move. So maybe scan remembered how the game actually finished or processed during those few seconds when I wa…

@dtmylens nice question! My guess is that you perhaps entered 15.2520 on your phone before letting it run? Engines tend to remember variations and that's how it spots the win seemingly right away.…

+ as well, you need to increase DEPTH of analysis by clicking on blue "+" sign. According to standard settings, it is 16, but you should be able to increase, and then more calculations are performed a…

@dtmylens Check your PC settings, particularly with regards to CPU. If an access to CPU is limited or blocked (and some antivirus programs love to do it), of course, you will have these issues.

The question is. Why my computer with strong processor can't see it even after very long thinking. And on my phone can with bad processing power. It doesn't make sense

Generally speaking, Scan tends to underestimate a win by imprisonment, except if it can rely on tablebase data. However, your position is out of tablebases, so the engine can go wrong easily. So far…