Do engines lack something?

So you're saying that the machines will take over the world??

after move 40 they just started defending in a way which to me and probably to all non Gm humans was sensless

Engines possess the combimed knowledge of the human history of chess plus the ability to play 24/7/365 without sleep, water or food. Just keep them plugged into the electrical outlet and we're good to go Jakey. I think as an instruction tool they are the greatest thing since sliced bread but not ice cream. I won't go that far!

Um... I'm not exactly an expert, but perhaps they were using the bishops to stop each other's pawns from advancing?

After 40 moves, you still have your Bishops and they're blocking pawns, well, that means you're cheating with chess engine for sure. -Otto B. Schott  

Computers programmes are made to find the best possible moves every time. So they always try to find the best according to the codes written in them. Different engine sees and evaluates same positions differently. But not necessarily means that they will come out with different moves every time. As these engines are all made to find the best possible moves every time and their evaluations are not at all Human like their move sequences are totally or partially different than Human players. Human players try to establish relations and patters in a given positipn but can not calculate very deeply and accurately like engines. So it basically can be said that human produces a certain Road map in their brain by applying some limited chess knowledge and follows them. But engines also do much more than only following any patten in a given position. They try to find moves which are not of common sense and very suitable according to a position but actually very deep rooted and far far accurate than a normal human moves who basically follows pattern. This is because human brain can not calculate all the out comes and move sequences exhaustively and accurately several moves ahead but engines can. So this gives engines a very significant and decisive edge over best of human players. At the early stage of engine development they were just inferior than the human players as they did not possesses any positional understanding and chess knowledge like human grand masters. So their rating was just below 2300-2400. As only deep calculation is not enough to become strong players. So the programmers also began to think how to make engines full of chess knowledge and positionally sound like human masters and day by day they keep updating and writing engines which are not only a mere calculator but also positionally and strategically very very strong and sound. And eventually their efforts paid and now a days engines are not only capable of plying strong chess like top human players but actually far far stronger than any human players ever born on earth. Now how can u understand that an engine posseses positional and theoretical knowledge Iike human players?.. Well you can very well put a random position which are draw by all means into an engine and you will instantly see that engine also recognising the position as a draw without even thinking for a second. Now this can never be happened so quickly if they do not posses any theoretical and positional knowledge like human players. Now again u fed a won position and u will instantly see that the score goes up or down(+/-) in favor of either side. Now this also is the result of positional and theoretical understanding just like human players. So even though they do not play with definite planning and strategy like human players but yet their moves are far more perfect and sound than any human players and tactically human players are just children in front of these chess monsters. And in endgame due to their knowledge and super calculation power they are just miles miles ahead than any strong players. We say that Carlsen is strong in endgame. But compared to modern engines like SF, H4, KMDO he is just an ordinary mediocre or weak player. Engines (not the famous Deep Blue) have bypassed best human players a decade ago. And yet they are developing with their knowledge, strategy, endgame techniques and much more. So now the question is, are engines perfect in all phases of games?.. No they are not but the ultimate goal is to make them perfect and the last words of chess. And already they are very very high in performance and calibre... That's why we all use engines to analyse and learn the mistakes, blunders, best moves, alternative lines, variations and list is very long. Human brain have limited thinking power, limited memory capacity and execution power. Machines also have limitations but they actually are free of human biased ness, fatigue, volatile memory, overlooking error, inability to calculate deeply and quickly, Random assumptions etc. etc. These all make human imperfect, less capable and inaccurate in their judgements, calculations and understanding positions correctly and accurately. But engines are not victims of these inherited human weaknesses and inefficiencies. So they are much much better than human players when the issue of performances comes in mind. So hope I gave a good insight of modern day engines' strengths and lacks.. Why they are far superior compared to any human players we can name...

Computers are very strong calculators, since they use their processor, while we use our brains. But, their strategic understanding is not as great as their calculation skill, so they can be beaten in closed positions or endgames by top GM-s. But it may change.

Houdini can beat any Super GM in any position even if it is closed assuming the position isn't losing for houdini with perfect play