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For this reason I don't like to add any authors here. It is not a question who is the author of an item HERE. But some of you are able to see this question MAINLY. It is better to write NOTHING than a wrong data. Here are position dedicated machines MAINLY. They are far to want to know it. I have do...

... All the 4 studies should be very easy for engines but, not by searching, and playing. Please try the great van Breukelen's study: 1r4Q1/7p/2N1B2k/7P/3Pp1P1/K1N1P2R/PP2PR2/8 b - - 0 1 to play as match eg. Stockfish vs Stockfish and, if the used engine is ok, you always (9/10) will see the result...

... All the 4 studies should be very easy for engines but, not by searching, and playing. Please try the great van Breukelen's study: 1r4Q1/7p/2N1B2k/7P/3Pp1P1/K1N1P2R/PP2PR2/8 b - - 0 1 to play as match eg. Stockfish vs Stockfish and, if the used engine is ok, you always (9/10) will see the result...

kB5K/2P4B/P4rP1/4r3/2N1n3/1RP4N/3b4/6RQ b - - 0 1 It is a wonderful example (thanks!) to prove that "auto-playing" can be the best way to get such long-string-solution positions. Sting 16++ returns the full solution in 5 second per move (old dual core!) f6f8 h8g7 d2h6 g7h6 e5h5 h6h5 f8f5 h3g5 f5g5 ...

kB5K/2P4B/P4rP1/4r3/2N1n3/1RP4N/3b4/6RQ b - - 0 1 It is a wonderful example (thanks!) to prove that "auto-playing" can be the best way to get such long-string-solution positions. Sting 16++ returns the full solution in 5 second per move (old dual core!) f6f8 h8g7 d2h6 g7h6 e5h5 h6h5 f8f5 h3g5 f5g5 ...

(CORRECTION) The authors of studies selected to the "IQ" test: by YACPDB: Blathy Otto - 2, 11, 12 Benko Pal - 15, 74 Hasek Josef - 21, 27 Gurvich Abram - 22 Kasparyan Genrikh - 23 Neghina Mihai - 26 Grasemann Herbert - 36 Popov Georgy & Hanyan Aleksei - 38 (part of study) Rudolph William - 45 Troitz...

Two last positions from here. Conditions as earlier. 3N4/2K1p3/3r1n2/2R2p2/1rp2N2/1PQ3P1/qP1pR1PB/4nk2 w - - 0 1 e2f2 f1f2 c3e3 f2e3 h2g1 e3e4 c5e5 e4e5 d8f7 e5e4 f7g5 e4e5 f4g6 e5d5 g6e7 d5e5 e7g6 e5d5 g6f4 d5e5 g5f7 e5e4 f7d6 e4e5 d6f7 e5e4 f7g5 e4e5 f4g6 e5d5 g6e7 d5e5 e7c6 e5d5 c6b4 d5e5 b4c6 e5...

One good example from here (above) more. 1r4Q1/7p/2N1B2k/7P/3Pp1P1/K1N1P2R/PP2PR2/8 b - - 0 1 Again Sting (next), "auto-playing" and 5 seconds per mov as earlier. b8b3 a3a4 b3b4 a4a5 b4b5 a5a6 b5b6 a6a7 b6b7 a7a8 b7a7 a8b8 a7b7 b8c8 b7c7 c8d8 c7d7 d8e8 d7e7 e8f8 e7e8 f8f7 e8e7 f7f6 e7f7 f6e5 f7f5 e5...

Hi! 8/p6p/4P2p/p3K1pP/pPk5/p2r2p1/P5R1/8 w - - 0 1 I guess you know the solution, if really not, I'll give it, but maybe some others want to puzzle before too. As much as that: it was in CCC already at least once, yet fen- search didn't find it just now, YACPD neither, the theme is Cyclic Zugzwang,...

kB5K/2P4B/P4rP1/4r3/2N1n3/1RP4N/3b4/6RQ b - - 0 1 It is a wonderful example (thanks!) to prove that "auto-playing" can be the best way to get such long-string-solution positions. Sting 16++ returns the full solution in 5 second per move (old dual core!) f6f8 h8g7 d2h6 g7h6 e5h5 h6h5 f8f5 h3g5 f5g5 ...