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Because the engine's depth is extremely limited. I doesn't see much beyond tiny tactics.

Sorry, bad link above, leading to the final position. Take this one instead. http://de.lichess.org/rtRrfxCj/

...it hurts even more to not wipe him off the board like he deserves. Please note that 24.e7+ is not the best checkmate sequence ;) http://de.lichess.org/rtRrfxCj/white#68

# Thank you for the "excellent". I think these structures are pleasant for White in general. All White had to do was make 14 schematic moves to get a overwhelming position. 15.e5 and tear him up was t…

My slow brain makes me suck so hard at blitz and rapid that it took 300 games on this site before one of them was good enough to make a guy tell the tournament lobby that i cheat with an engine. Ok, i…

No problem, just wanted to share since you said "slightly more complex" examples for tactics. There are tons of cool lines in this one, but I agree this stuff may be too deep for a quick tactics coach…

Take a look at this study, definitely my best win in a long time and a beauty for sure. It's a correspondence game, where quick wins are near to impossible these days. This one is not exactly under 20…

Best approach with these positions may be to answer "Where is it impossible to blunder" and then click the other one. Worked well for me.

#23 Not necessarily. I can assure you that some people suck so hard at blitz and/or are so rusty that their Elo is higher than their Lichess rating. An exception of course, but these guys exist.