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I was never able to find any use for a big hash table, nothing bigger than 128MB helped, and sometimes clearing the hash found the move faster in a key position (on the distance, not at the root.) I guess if you're at the point at which a bigger hash helps the position, it's also the point you're sitting way too much time on the same one.

lech wrote: ↑Sat Nov 30, 2019 12:39 pm (!) I replaced the last item by a missing "perpetual check" example.

The "IQ" test is a very important part of my project (Sting) and doesn't contain middle-game tactical positions and technical endgames.
Here are positions dedicated to all engines to test so-called by me "quasi-intelligent" theirs abilities.
Set parameters: "threads" to 1 and "hash" to 1024 and clear hash before each of items.
Don't use such external tricks like: rule-50 changing, null-move disabling, special parameters and others.
The external tools like: MultiPV, tablebases, "backward-forward" and "Monte Carlo" are not welcome too.

"WIN" means the correct solution and some non-zero plus score.
Don't do the test in a machine way. Test and analyze each of items separately!

[pgn]
[Result "1"]
[FEN "rk6/p1r3p1/P3B1Kp/1p2B3/8/8/8/8 w - - 0 1"]

1. Bd7 {win}

[Result "2"]
[FEN "7k/6rp/6pN/1r4P1/3B4/8/8/K7 b - - 0 1"]

1... Rxg5

[Result "3"]
[FEN "1B1k4/3p4/1Kp5/PpP2p2/1PqP1P2/8/1P6/8 w - - 0 1"]

1. a6 {win}

[Result "4"]
[FEN "3N2r1/2K1p3/4Pk2/8/Bp5b/8/2P5/8 b - - 0 1"]

1... Bg3 2. Kd7 {or Kc8} Rxd8

[Result "5"]
[FEN "8/7p/5P1k/1p5P/5p2/2p1p3/P1P1P1P1/1K3Nb1 w - - 0 1"]

1. Ng3

[Result "6"]
[FEN "6q1/PpB5/k7/P6K/6n1/1P4p1/5p2/1B3N1N w - - 0 1"]

1. a8Q {or a8R}

[Result "7"]
[FEN "6k1/6p1/4Rb1p/p7/rp2P1N1/2P3P1/1P5P/6K1 b - - 0 1"]

1... Bxc3

[Result "8"]
[FEN "8/8/p2k1p2/1p1p3p/1P1P3p/P3NPP1/5K2/1b6 w - - 0 1"]

1. Ng2

[Result "9"]
[FEN "2k5/p7/Pp1p1b2/1P1P1p2/2P2P1p/3K3P/5B2/8 w - - 0 1"]

1. c5

[Result "10"]
[FEN "1n6/Pp1p1p1p/1P1P1P1P/4K3/2p5/p7/rpp1P3/qkb1R3 w - - 0 1"]

1. axb8N {win}

[Result "11"]
[FEN "1N4K1/1pp1p3/7k/2r3pP/p2pp1P1/P6N/8/2B5 w - - 0 1"]

1. Nc6

[Result "12"]
[FEN "5K2/k4p1p/5p1p/1p3p2/bP6/1p6/1P5p/7B w - - 0 1"]

1. Ke8 {or Ke7 win}

[Result "13"]
[FEN "k1b5/1p1p1p1p/1PpPpP2/2B5/8/2p1p2P/2PbP3/3K4 w - - 0 1"]

1. Bd4 {win}

[Result "14"]
[FEN "8/8/8/8/1kB1q3/8/1PRb4/1K6 b - - 0 1"]

1... Qh1 2. Ka2 Qa8 3.Kb1 Qe4 {or other way to get the start position for

white: 8/8/8/8/1kB1q3/8/1PRb4/1K6 w - - 0 1}

[Result "15"]
[FEN "8/2N4r/1p3pkp/8/5K1p/2P4N/P3Bn2/8 w - - 0 1"]

1. Bh5

[Result "16"]
[FEN "4k1rr/1R1R3p/8/8/8/2K5/7P/8 w k - 0 1"]

1. Rd2

[Result "17"]
[FEN "5k2/4bp2/2B3p1/1P4p1/3R4/3P2PP/2r2PK1/8 b - - 0 1"]

1... Rxf2

[Result "18"]
[FEN "1b6/2p5/1kB5/1PN5/8/3K4/8/q7 w - - 0 1"]

1. Nb3

[Result "19"]
[FEN "N7/8/2KQ2rp/6k1/3p3p/2p4P/4PP2/5N2 w - - 0 1"]

1. f4

[Result "20"]
[FEN "2br4/r2pp3/8/1p1p1kN1/pP1P4/2P3R1/PP3PP1/2K5 w - - 0 1"]

1. Nf7 Re8 2. Nd6

[Result "21"]
[FEN "8/8/4B3/6p1/7k/8/4pPKP/8 w - - 0 1"]

1. Bg4

[Result "22"]
[FEN "r7/7k/5R2/p3p3/Pp1pPp2/1PpP1Pp1/K1P3P1/8 w - - 0 1"]

1. Kb1 Kg7 {or 1... Rh8 2. Rf8} 2. Rh6

[Result "23"]
[FEN "1K3kB1/8/6p1/7R/8/4b3/8/6n1 w - - 0 1"]

1. Rh8 Kg7 2. Bh7

[Result "24"]
[FEN "8/8/R7/1b4k1/5p2/1B3r2/7P/7K w - - 0 1"]

1. h4 Kxh4 2. Rh6 Kg5 3. Rh5

[Result "25"]
[FEN "7Q/4p3/4p3/p1p1P3/Pp2P3/3Kp3/p1PbP3/kN6 w - - 0 1"]

1. Na3 bxa3 2. Qh1 Kb2 3. Qa1 Kxa1 4. c4

[Result "26"]
[FEN "7r/K7/5k1n/p3p3/Pp1pPp1p/1PpP1PpP/2P3P1/N1RR1B2 b - - 0 1"]

{win}

[Result "27"]
[FEN "q7/b1p5/kp1p4/p2PN3/PPP5/1K6/8/5B2 w - - 0 1"]

1. c5 Kb7 2. Ba6 {win}

[Result "28"]
[FEN "1k1n4/1p1b1p2/1Bp1pPp1/1PP1P3/8/6P1/8/1K6 w - - 0 1"]

1. Bc7 {win}

[Result "29"]
[FEN "4q1kr/p6p/1prQPppB/4n3/4P3/2P5/PP2B2P/R5K1 w - - 0 1"]

1. Qxe5 {win}

[Result "30"]
[FEN "q1b4n/1p1pKp2/1p1p1Pp1/1P1P2Pp/2P4P/8/7R/1N1k4 w - - 0 1"]

1. Ra2 {win}

[Result "31"]
[FEN "3k4/2pq3p/pp5R/4P3/P6P/2PN4/1PN3K1/8 w - - 0 1"]

1. Nd4 {win}

[Result "32"]
[FEN "8/7p/6pP/p4pP1/3BpP2/p1KpP3/pn1N4/k7 w - - 0 1"]

1. Bh8 {win}

[Result "33"]
[FEN "8/6p1/p7/rp1K2p1/kb3pP1/2p2p1b/P1Np1P2/3N2R1 w - - 0 1"]

1. Ke6 {or Ke4 win}

[Result "34"]
[FEN "B7/p1p5/k2p4/p3p3/P1Nb1p2/6p1/7p/4K3 w - - 0 1"]

{Ke1->h3->c8}

[Result "35"]
[FEN "1qN5/b1pB4/1pP2k2/pP3P2/P1P5/8/8/K7 w - - 0 1"]

{Ka1->h5->d8}

[Result "36"]
[FEN "8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w - - 0 1"]

1. Nf6

[Result "37"]
[FEN "8/5K2/3p3p/3p3P/pp1P4/rkb1R3/p1p3P1/n1B2B2 w - - 0 1"]

1. Rd3 {win}

[Result "38"]
[FEN "6bn/p4p1k/rp3Pp1/rp2BBP1/1p6/pK6/P2P4/8 w - - 0 1"]

1. Bc8 {win}

[Result "39"]
[FEN "qn6/b1Kp3p/p1pB3p/p7/P1NkP3/2pP4/2B5/8 w - - 0 1"]

1. Bf4 {or Kc8}

[Result "40"]
[FEN "8/P7/4k3/8/5P2/4Bq2/5P2/5K2 b - - 0 1"]

1... Kf5

[Result "41"]
[FEN "8/6kP/1p6/p7/Pr6/K2B4/8/8 b - - 0 1"]

{Rb4->h4 and next Kg7->e5}

[Result "42"]
[FEN "8/8/2b1N3/5p2/3B4/2K5/6kp/R7 w - - 0 1"]

1. Rh1

[Result "43"]
[FEN "8/8/4kpp1/3p1b2/p6P/2B5/6P1/6K1 b - - 0 1"]

1... Bh3

[Result "44"]
[FEN "5rk1/5ppp/p1Q1p3/1R6/q7/4b1P1/P2RPP1P/6K1 w - - 0 1"]

1. Rd8 {win}

[Result "45"]
[FEN "r7/1b1r4/k1p1p1p1/1p1pPpPp/p1PP1P1P/PP1K4/8/4Q3 w - - 0 1"]

1. Qa5

[Result "46"]
[FEN "3B4/1r2p3/r2p1p2/bkp1P1p1/1p1P1PPp/p1P4P/PPB1K3/8 w - - 0 1"]

1. Ba4

[Result "47"]
[FEN "2k5/2p5/1q1p4/pPpPp1pp/N1P1Pp2/P4PbP/KQ4P1/8 w - - 0 1"]

{avoid Nxb6}

[Result "48"]
[FEN "1r6/4k3/r2p2p1/2pR1p1p/2P1pP1P/pPK1P1P1/P7/1B6 b - - 0 1"]

1... Rxb3

[Result "49"]
[FEN "8/5k2/6p1/4BP1p/6p1/p1p3PP/6P1/1n2K2R b K - 0 1"]

1... a2 2. fxg6 Kg8

[Result "50"]
[FEN "8/3k1b1r/2p1p1p1/rpPpPpPp/p2P1P1P/P2K4/8/4B3 w - - 0 1"]

1. Bb4

[Result "51"]
[FEN "7b/p1p1p3/P1PpPp2/2nP1kpr/5P1p/p3KBPP/P7/8 w - - 0 1"]

1. Be4

[Result "52"]
[FEN "7r/p1p1p1pk/3pPp1p/2pP1PP1/P1P4P/1K6/P6B/8 w - - 0 1"]

1. g6 Kg8 2. a5 a6 3. Bxd6 cxd6 4. h5 {or 2. Bxd6 cxd6 3. h5}

[Result "53"]
[FEN "8/1p1q1k2/1Pp5/p1Pp4/P2Pp1p1/4PpPp/1N3P1P/3B2K1 w - - 0 1"]

1. Bb3 Qc8 2. Nd1 Qa8 3. Bc4

[Result "54"]
[FEN "8/8/2pk4/8/p1p3B1/PpP5/1P6/r1NK4 w - - 0 1"]

1. Bf5 Ra2 2. Nxa2 bxa2 3. Kc1 a1Q 4. Bb1

[Result "55"]
[FEN "1R3b2/5ppQ/6Pp/6PP/R6P/P7/7K/2q1k3 w - - 0 1"]

1. Rb1 Qxb1 2. gxf7

[Result "56"]
[FEN "Kn6/8/8/3R2PB/8/2p2NP1/1q6/2k5 w - - 0 1"]

1. Rd1

[Result "57"]
[FEN "1B3B1B/2B5/p6B/8/8/8/8/1k1K4 w - - 0 1"]

1. Bce5

[Result "58"]
[FEN "4kr2/5p1K/3p1Q2/1p4P1/4P3/1PP5/7b/8 w - - 0 1"]

1. Kh6 {win}

[Result "59"]
[FEN "6R1/8/2pB3k/2P4p/5p1q/5P2/4P1K1/8 w - - 0 1"]

1. Bf8 {win}

[Result "60"]
[FEN "n2Bqk2/5p1p/Q4KP1/p7/8/8/8/8 w - - 0 1"]

1. Qc8 Kg8 2. Bc7 {win}

[Result "61"]
[FEN "8/5p2/8/8/p7/rpK4p/1p3ppr/bQ1N1bqk w - - 0 1"]

1. Kb4 {or Kd4 win}

[Result "62"]
[FEN "8/8/7p/3KNN1k/2p4p/8/3P2p1/8 w - - 0 1"]

1. Kc6

[Result "63"]
[FEN "1R6/pPk1r3/2p5/K7/8/2B1b3/8/8 w - - 0 1"]

1. Ka6

[Result "64"]
[FEN "8/p7/qkpN1p2/8/1B1P4/PP3K2/5P2/8 w - - 0 1"]

1. Ba5 {win}

[Result "65"]
[FEN "2N5/p7/P7/8/1KPp1p1p/3p1Bpp/3P2rq/R5bk w - - 0 1"]

1. Nb6 {win}

[Result "66"]
[FEN "5kN1/3p1q2/5P2/5PP1/2pK4/1p1R4/1P6/8 w - - 0 1"]

1. Rxb3

[Result "67"]
[FEN "2b1rk2/5p2/p1P5/2p2P2/2p5/7B/P7/2KR4 w - - 0 1"]

1. f6

[Result "68"]
[FEN "2r5/prkpR1p1/2p1ppK1/P1p1N1B1/P1P1P3/8/8/8 w - - 0 1"]

1. Bf4

[Result "69"]
[FEN "rk1b4/p2p2p1/1P6/2R2P2/8/2K5/8/5B2 w - - 0 1"]

1. Rc8

[Result "70"]
[FEN "3k4/4pp2/n2n4/5BN1/3N4/b7/4K3/8 w - - 0 1"]

1. Nxf7

[Result "71"]
[FEN "4b3/8/1P6/3K4/6p1/5pP1/5P1B/7k w - - 0 1"]

1. b7 Bb5 2. b8R

[Result "72"]
[FEN "8/5pKN/5Pp1/5kP1/8/Bb6/8/7q w - - 0 1"]

1. Bc5 {or any move} Qxh7+

[Result "73"]
[FEN "8/p5p1/1pP3p1/p5p1/k3p3/4p3/K7/8 w - - 0 1"]

1. c7 {win}

[Result "74"]
[FEN "q7/8/2p5/B2p2pp/5pp1/2N3k1/6P1/7K w - - 0 1"]

1. Ne4 Kh4 2. Ng3 fxg3 3. Bb6

[Result "75"]
[FEN "q7/7R/k7/1p6/1p6/1P2B3/7K/8 w - - 0 1"]

1. Bd4 {win}

[Result "76"]
[FEN "1q1r3k/3P1pp1/ppBR1n1p/4Q2P/P4P2/8/5PK1/8 w - - 0 1"]

1. Rxf6

[Result "77"]
[FEN "1r3q1k/2N2P1p/6pQ/4p3/7p/n6P/3B4/7K w - - 0 1"]

1. Qf4 {win}

[Result "78"]
[FEN "5nr1/2Pp2pk/3Pp1p1/4P1P1/6P1/5K2/8/7n w - - 0 1"]

1. c8N

[Result "79"]
[FEN "2K3k1/1p6/R3p1p1/1rB1P1P1/8/8/1Pb5/8 w - - 0 1"]

1. Rc6

[Result "80"]
[FEN "4q3/2r1r2p/3P3P/1p6/kP6/Pp6/1P6/KB2R3 w - - 0 1"]

1. Rxe7 Qxe7 {or 1... Rxe7 2. dxe7} 2. dxc7

[Result "81"]
[FEN "3k4/8/7p/2p1p1pP/1pPpPpP1/1P1P1P2/N7/2K5 w - - 0 1"]

{Na2->h4}

[Result "82"]
[FEN "8/8/8/1k3p2/p1p1pPp1/PpPpP1Pp/1P1P3P/QNK2NRR w - - 0 1"]

{win}

[Result "83"]
[FEN "4b1k1/P4pPp/1R3P1P/2r5/8/1P6/1K6/8 w - - 0 1"]

1. a8B

[Result "84"]
[FEN "4N2k/4PB1p/7P/B1p5/2P5/3q2Pp/1P3P1K/2r5 w - - 0 1"]

1. Bc3 Rxc3 2. Nc7

[Result "85"]
[FEN "1k6/3p4/1B6/4Pp1p/1p5R/1p4p1/pP3n2/K6n w - - 0 1"]

1. Rxh1 Nxh1 2. e6 dxe6 3. Bc7

[Result "86"]
[FEN "N3kb2/pq4p1/4B1P1/1p1P2B1/p7/3P4/2P5/2K5 w - - 0 1"]

1. Bf7 Kd7 2. Be6 Kd6 3. Bf4 Kc5 4. Be3 Kb4 5. Bd2 Ka3 6. Kb1

[Result "87"]
[FEN "8/1B3b1p/7P/p2p4/P2pp1kp/Q7/1N1Pq2P/7K w - - 0 1"]

1. Qh3

[Result "88"]
[FEN "1B2b2k/2N1qr2/4n2p/4p1PQ/1r2N3/1p6/7P/2KB4 w - - 0 1"]

1. Nd5 Rc4 2. Kb1 Rc1 3. Kb2 Rf2 4. Nf2 Rb1 5. Kb1 Qh7 6. g6 Bg6 7. Bc2 bxc2

8. Kc1 Bxh5 9. Be5 Ng7 10. Ne7

[Result "89"]
[FEN "2k4N/Q1np4/2p2Bpp/1p1P4/pPP1p2P/P7/7q/1K6 w - - 0 1"]

1. Nf7 Qg3 2. Qxc7 {win}

[Result "90"]
[FEN "8/4nk2/1p3p2/2rp2pp/1P1R1N1P/6P1/3KPP2/8 b - - 0 1"]

{avoid 1... Rb5}

[Result "91"]
[FEN "5BK1/5p1N/5Pp1/6Pk/8/1b6/8/7q b - - 0 1"]

1... Qa8 2.Kg7 Qd5 {or Qg2 and next Qxg5}

[Result "92"]
[FEN "2b5/1pr4p/3bp1pk/1p6/1PpN2PP/K1P1n3/P3N1R1/3R4 w - - 0 1"]

1. Nxb5 Nxd1 2. Nd6 b5 3. g5 Kh5 4. Nxc8 Rxc8 5. Nf4 Kxh4 6. Nxg6

[Result "93"]
[FEN "8/1p1pNpbk/q2P4/p3p2K/PP2N3/4P1P1/3P4/8 w - - 0 1"]

1. b5 Qb6 2. Nc8

[Result "94"]
[FEN "1rr5/6pk/7p/8/8/7P/1Pb1RRPK/8 b - - 0 1"]

{avoid Rxb2}

[Result "95"]
[FEN "6Q1/8/8/8/8/7k/ppp1p3/brrbK3 w - - 0 1"]

1. Qg1 {win}

[Result "96"]
[FEN "1B1K1k2/4N2p/3pP1pP/6p1/p7/3N2b1/2r2p2/8 w - - 0 1"]

1. Nc6 {win}

[Result "97"]
[FEN "8/4Pr1N/8/6PN/8/3K1ppp/4prkb/4Bbnn w - - 0 1"]

1. Nf8 {win}

[Result "98"]
[FEN "8/b7/3p2b1/5p1n/5Pk1/4P1p1/B5P1/R4K2 w - - 0 1"]

1. Ke2

[Result "99"]
[FEN "5K2/8/5B2/p7/8/p4p2/pn1PpPp1/kb2R3 w - - 0 1"]

1. Bh8 a4 2. Kg7 {win}

[Result "100"]
[FEN "3rqQ2/3ppppp/7k/R7/8/8/1PPP2K1/8 w - - 0 1"]

1. Ra3
[/pgn]

The authors of studies selected to the "IQ" test:

by YACPDB:

Blathy Otto - 3, 12, 13
Benko Pal - 16, 75
Hasek Josef - 22, 28
Gurvich Abram - 23
Kasparyan Genrikh - 24
Neghina Mihai - 27
Grasemann Herbert - 37
Popov Georgy & Hanyan Aleksei - 39 (part of study)
Rudolph William - 46
Troitzky Aleksei - 57
Reti Richard - 58
Matous Mario - 60
Behting Carl - 62
Klyatskin Mikhail - 66
Kubbel Karl - 69
Novomesky Daniel - 73
Lazard Frederic - 74
Marwitz Jan - 79
Lamford Paul - 82
Simkhovich Froim - 86

by other sources:

Solovyov Y. - 6
Babic M. - 9
Neghina Mihai - 11, 31, 84, 87, 89, 92
Simkhovich Froim - 20
van Breukelen Gijs - 36
Hoch Yehuda & Aloni Hillel - 55
Troitzky Aleksei - 59
Smyslov Vasily - 67
Bondarenko F. & Kuznetsov A. - 68
Surya Sekhar Ganguly - 81
Stavrietsky Aleksandr - 88
Kazantsev A. - 93
Ryabinin Nikolaj - 96
Neghina Mihai & Rusz Arpad- 97
Kamody Mario & Neghina Mihai - 98
Fekete Zoltan - 99 (part of study)

Babic M. - 9 is wrong source.
It's Spassky - Byrne, 1974; (same ERET 097)

Thanks, it is my mistake and I found 2 nexts. The corrected version is:

The "IQ" test is a very important part of my project (Sting) and doesn't contain middle-game tactical positions and technical endgames.
Here are positions dedicated to all engines to test so-called by me "quasi-intelligent" theirs abilities.
Set parameters: "threads" to 1 and "hash" to 1024 and clear hash before each of items.
Don't use such external tricks like: rule-50 changing, null-move disabling, special parameters and others.
The external tools like: MultiPV, tablebases, "backward-forward" and "Monte Carlo" are not welcome too.

"WIN" means the correct solution and some non-zero plus score.
Don't do the test in a machine way. Test and analyze each of items separately!

[pgn]
[Result "1"]
[FEN "rk6/p1r3p1/P3B1Kp/1p2B3/8/8/8/8 w - - 0 1"]

1. Bd7 {win}

[Result "2"]
[FEN "7k/6rp/6pN/1r4P1/3B4/8/8/K7 b - - 0 1"]

1... Rxg5

[Result "3"]
[FEN "1B1k4/3p4/1Kp5/PpP2p2/1PqP1P2/8/1P6/8 w - - 0 1"]

1. a6 {win}

[Result "4"]
[FEN "3N2r1/2K1p3/4Pk2/8/Bp5b/8/2P5/8 b - - 0 1"]

1... Bg3 2. Kd7 {or Kc8} Rxd8

[Result "5"]
[FEN "8/7p/5P1k/1p5P/5p2/2p1p3/P1P1P1P1/1K3Nb1 w - - 0 1"]

1. Ng3

[Result "6"]
[FEN "6q1/PpB5/k7/P6K/6n1/1P4p1/5p2/1B3N1N w - - 0 1"]

1. a8Q {or a8R}

[Result "7"]
[FEN "6k1/6p1/4Rb1p/p7/rp2P1N1/2P3P1/1P5P/6K1 b - - 0 1"]

1... Bxc3

[Result "8"]
[FEN "8/8/p2k1p2/1p1p3p/1P1P3p/P3NPP1/5K2/1b6 w - - 0 1"]

1. Ng2

[Result "9"]
[FEN "2k5/p7/Pp1p1b2/1P1P1p2/2P2P1p/3K3P/5B2/8 w - - 0 1"]

1. c5

[Result "10"]
[FEN "1n6/Pp1p1p1p/1P1P1P1P/4K3/2p5/p7/rpp1P3/qkb1R3 w - - 0 1"]

1. axb8N {win}

[Result "11"]
[FEN "1N4K1/1pp1p3/7k/2r3pP/p2pp1P1/P6N/8/2B5 w - - 0 1"]

1. Nc6

[Result "12"]
[FEN "5K2/k4p1p/5p1p/1p3p2/bP6/1p6/1P5p/7B w - - 0 1"]

1. Ke8 {or Ke7 win}

[Result "13"]
[FEN "k1b5/1p1p1p1p/1PpPpP2/2B5/8/2p1p2P/2PbP3/3K4 w - - 0 1"]

1. Bd4 {win}

[Result "14"]
[FEN "8/8/8/8/1kB1q3/8/1PRb4/1K6 b - - 0 1"]

1... Qh1 2. Ka2 Qa8 3.Kb1 Qe4 {or other way to get the start position for

white: 8/8/8/8/1kB1q3/8/1PRb4/1K6 w - - 0 1}

[Result "15"]
[FEN "8/2N4r/1p3pkp/8/5K1p/2P4N/P3Bn2/8 w - - 0 1"]

1. Bh5

[Result "16"]
[FEN "4k1rr/1R1R3p/8/8/8/2K5/7P/8 w k - 0 1"]

1. Rd2

[Result "17"]
[FEN "5k2/4bp2/2B3p1/1P4p1/3R4/3P2PP/2r2PK1/8 b - - 0 1"]

1... Rxf2

[Result "18"]
[FEN "1b6/2p5/1kB5/1PN5/8/3K4/8/q7 w - - 0 1"]

1. Nb3

[Result "19"]
[FEN "N7/8/2KQ2rp/6k1/3p3p/2p4P/4PP2/5N2 w - - 0 1"]

1. f4

[Result "20"]
[FEN "2br4/r2pp3/8/1p1p1kN1/pP1P4/2P3R1/PP3PP1/2K5 w - - 0 1"]

1. Nf7 Re8 2. Nd6

[Result "21"]
[FEN "8/8/4B3/6p1/7k/8/4pPKP/8 w - - 0 1"]

1. Bg4

[Result "22"]
[FEN "r7/7k/5R2/p3p3/Pp1pPp2/1PpP1Pp1/K1P3P1/8 w - - 0 1"]

1. Kb1 Kg7 {or 1... Rh8 2. Rf8} 2. Rh6

[Result "23"]
[FEN "1K3kB1/8/6p1/7R/8/4b3/8/6n1 w - - 0 1"]

1. Rh8 Kg7 2. Bh7

[Result "24"]
[FEN "8/8/R7/1b4k1/5p2/1B3r2/7P/7K w - - 0 1"]

1. h4 Kxh4 2. Rh6 Kg5 3. Rh5

[Result "25"]
[FEN "7Q/4p3/4p3/p1p1P3/Pp2P3/3Kp3/p1PbP3/kN6 w - - 0 1"]

1. Na3 bxa3 2. Qh1 Kb2 3. Qa1 Kxa1 4. c4

[Result "26"]
[FEN "7r/K7/5k1n/p3p3/Pp1pPp1p/1PpP1PpP/2P3P1/N1RR1B2 b - - 0 1"]

{win}

[Result "27"]
[FEN "q7/b1p5/kp1p4/p2PN3/PPP5/1K6/8/5B2 w - - 0 1"]

1. c5 Kb7 2. Ba6 {win}

[Result "28"]
[FEN "1k1n4/1p1b1p2/1Bp1pPp1/1PP1P3/8/6P1/8/1K6 w - - 0 1"]

1. Bc7 {win}

[Result "29"]
[FEN "4q1kr/p6p/1prQPppB/4n3/4P3/2P5/PP2B2P/R5K1 w - - 0 1"]

1. Qxe5 {win}

[Result "30"]
[FEN "q1b4n/1p1pKp2/1p1p1Pp1/1P1P2Pp/2P4P/8/7R/1N1k4 w - - 0 1"]

1. Ra2 {win}

[Result "31"]
[FEN "3k4/2pq3p/pp5R/4P3/P6P/2PN4/1PN3K1/8 w - - 0 1"]

1. Nd4 {win}

[Result "32"]
[FEN "8/7p/6pP/p4pP1/3BpP2/p1KpP3/pn1N4/k7 w - - 0 1"]

1. Bh8 {win}

[Result "33"]
[FEN "8/6p1/p7/rp1K2p1/kb3pP1/2p2p1b/P1Np1P2/3N2R1 w - - 0 1"]

1. Ke6 {or Ke4 win}

[Result "34"]
[FEN "B7/p1p5/k2p4/p3p3/P1Nb1p2/6p1/7p/4K3 w - - 0 1"]

{Ke1->h3->c8}

[Result "35"]
[FEN "1qN5/b1pB4/1pP2k2/pP3P2/P1P5/8/8/K7 w - - 0 1"]

{Ka1->h5->d8}

[Result "36"]
[FEN "8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w - - 0 1"]

1. Nf6

[Result "37"]
[FEN "8/5K2/3p3p/3p3P/pp1P4/rkb1R3/p1p3P1/n1B2B2 w - - 0 1"]

1. Rd3 {win}

[Result "38"]
[FEN "6bn/p4p1k/rp3Pp1/rp2BBP1/1p6/pK6/P2P4/8 w - - 0 1"]

1. Bc8 {win}

[Result "39"]
[FEN "qn6/b1Kp3p/p1pB3p/p7/P1NkP3/2pP4/2B5/8 w - - 0 1"]

1. Bf4 {or Kc8 - win}

[Result "40"]
[FEN "8/P7/4k3/8/5P2/4Bq2/5P2/5K2 b - - 0 1"]

1... Kf5

[Result "41"]
[FEN "8/6kP/1p6/p7/Pr6/K2B4/8/8 b - - 0 1"]

{Rb4->h4 and next Kg7->e5}

[Result "42"]
[FEN "8/8/2b1N3/5p2/3B4/2K5/6kp/R7 w - - 0 1"]

1. Rh1

[Result "43"]
[FEN "8/8/4kpp1/3p1b2/p6P/2B5/6P1/6K1 b - - 0 1"]

1... Bh3

[Result "44"]
[FEN "5rk1/5ppp/p1Q1p3/1R6/q7/4b1P1/P2RPP1P/6K1 w - - 0 1"]

1. Rd8 {win}

[Result "45"]
[FEN "r7/1b1r4/k1p1p1p1/1p1pPpPp/p1PP1P1P/PP1K4/8/4Q3 w - - 0 1"]

1. Qa5

[Result "46"]
[FEN "3B4/1r2p3/r2p1p2/bkp1P1p1/1p1P1PPp/p1P4P/PPB1K3/8 w - - 0 1"]

1. Ba4

[Result "47"]
[FEN "2k5/2p5/1q1p4/pPpPp1pp/N1P1Pp2/P4PbP/KQ4P1/8 w - - 0 1"]

{avoid Nxb6}

[Result "48"]
[FEN "1r6/4k3/r2p2p1/2pR1p1p/2P1pP1P/pPK1P1P1/P7/1B6 b - - 0 1"]

1... Rxb3

[Result "49"]
[FEN "8/5k2/6p1/4BP1p/6p1/p1p3PP/6P1/1n2K2R b K - 0 1"]

1... a2 2. fxg6 Kg8

[Result "50"]
[FEN "8/3k1b1r/2p1p1p1/rpPpPpPp/p2P1P1P/P2K4/8/4B3 w - - 0 1"]

1. Bb4

[Result "51"]
[FEN "7b/p1p1p3/P1PpPp2/2nP1kpr/5P1p/p3KBPP/P7/8 w - - 0 1"]

1. Be4

[Result "52"]
[FEN "7r/p1p1p1pk/3pPp1p/2pP1PP1/P1P4P/1K6/P6B/8 w - - 0 1"]

1. g6 Kg8 2. a5 a6 3. Bxd6 cxd6 4. h5 {or 2. Bxd6 cxd6 3. h5}

[Result "53"]
[FEN "8/1p1q1k2/1Pp5/p1Pp4/P2Pp1p1/4PpPp/1N3P1P/3B2K1 w - - 0 1"]

1. Bb3 Qc8 2. Nd1 Qa8 3. Bc4

[Result "54"]
[FEN "8/8/2pk4/8/p1p3B1/PpP5/1P6/r1NK4 w - - 0 1"]

1. Bf5 Ra2 2. Nxa2 bxa2 3. Kc1 a1Q 4. Bb1

[Result "55"]
[FEN "1R3b2/5ppQ/6Pp/6PP/R6P/P7/7K/2q1k3 w - - 0 1"]

1. Rb1 Qxb1 2. gxf7

[Result "56"]
[FEN "Kn6/8/8/3R2PB/8/2p2NP1/1q6/2k5 w - - 0 1"]

1. Rd1

[Result "57"]
[FEN "1B3B1B/2B5/p6B/8/8/8/8/1k1K4 w - - 0 1"]

1. Bce5

[Result "58"]
[FEN "4kr2/5p1K/3p1Q2/1p4P1/4P3/1PP5/7b/8 w - - 0 1"]

1. Kh6 {win}

[Result "59"]
[FEN "6R1/8/2pB3k/2P4p/5p1q/5P2/4P1K1/8 w - - 0 1"]

1. Bf8 {win}

[Result "60"]
[FEN "n2Bqk2/5p1p/Q4KP1/p7/8/8/8/8 w - - 0 1"]

1. Qc8 Kg8 2. Bc7 {win}

[Result "61"]
[FEN "8/5p2/8/8/p7/rpK4p/1p3ppr/bQ1N1bqk w - - 0 1"]

1. Kb4 {or Kd4 win}

[Result "62"]
[FEN "8/8/7p/3KNN1k/2p4p/8/3P2p1/8 w - - 0 1"]

1. Kc6

[Result "63"]
[FEN "1R6/pPk1r3/2p5/K7/8/2B1b3/8/8 w - - 0 1"]

1. Ka6

[Result "64"]
[FEN "8/p7/qkpN1p2/8/1B1P4/PP3K2/5P2/8 w - - 0 1"]

1. Ba5 {win}

[Result "65"]
[FEN "2N5/p7/P7/8/1KPp1p1p/3p1Bpp/3P2rq/R5bk w - - 0 1"]

1. Nb6 {win}

[Result "66"]
[FEN "5kN1/3p1q2/5P2/5PP1/2pK4/1p1R4/1P6/8 w - - 0 1"]

1. Rxb3

[Result "67"]
[FEN "2b1rk2/5p2/p1P5/2p2P2/2p5/7B/P7/2KR4 w - - 0 1"]

1. f6

[Result "68"]
[FEN "2r5/prkpR1p1/2p1ppK1/P1p1N1B1/P1P1P3/8/8/8 w - - 0 1"]

1. Bf4

[Result "69"]
[FEN "rk1b4/p2p2p1/1P6/2R2P2/8/2K5/8/5B2 w - - 0 1"]

1. Rc8 {win}

[Result "70"]
[FEN "3k4/4pp2/n2n4/5BN1/3N4/b7/4K3/8 w - - 0 1"]

1. Nxf7

[Result "71"]
[FEN "4b3/8/1P6/3K4/6p1/5pP1/5P1B/7k w - - 0 1"]

1. b7 Bb5 2. b8R

[Result "72"]
[FEN "8/5pKN/5Pp1/5kP1/8/Bb6/8/7q w - - 0 1"]

1. Bc5 {or any move} Qxh7+

[Result "73"]
[FEN "8/p5p1/1pP3p1/p5p1/k3p3/4p3/K7/8 w - - 0 1"]

1. c7 {win}

[Result "74"]
[FEN "q7/8/2p5/B2p2pp/5pp1/2N3k1/6P1/7K w - - 0 1"]

1. Ne4 Kh4 2. Ng3 fxg3 3. Bb6

[Result "75"]
[FEN "q7/7R/k7/1p6/1p6/1P2B3/7K/8 w - - 0 1"]

1. Bd4 {win}

[Result "76"]
[FEN "1q1r3k/3P1pp1/ppBR1n1p/4Q2P/P4P2/8/5PK1/8 w - - 0 1"]

1. Rxf6

[Result "77"]
[FEN "1r3q1k/2N2P1p/6pQ/4p3/7p/n6P/3B4/7K w - - 0 1"]

1. Qf4 {win}

[Result "78"]
[FEN "5nr1/2Pp2pk/3Pp1p1/4P1P1/6P1/5K2/8/7n w - - 0 1"]

1. c8N

[Result "79"]
[FEN "2K3k1/1p6/R3p1p1/1rB1P1P1/8/8/1Pb5/8 w - - 0 1"]

1. Rc6

[Result "80"]
[FEN "4q3/2r1r2p/3P3P/1p6/kP6/Pp6/1P6/KB2R3 w - - 0 1"]

1. Rxe7 Qxe7 {or 1... Rxe7 2. dxe7} 2. dxc7

[Result "81"]
[FEN "3k4/8/7p/2p1p1pP/1pPpPpP1/1P1P1P2/N7/2K5 w - - 0 1"]

{Na2->h4}

[Result "82"]
[FEN "8/8/8/1k3p2/p1p1pPp1/PpPpP1Pp/1P1P3P/QNK2NRR w - - 0 1"]

{win}

[Result "83"]
[FEN "4b1k1/P4pPp/1R3P1P/2r5/8/1P6/1K6/8 w - - 0 1"]

1. a8B

[Result "84"]
[FEN "4N2k/4PB1p/7P/B1p5/2P5/3q2Pp/1P3P1K/2r5 w - - 0 1"]

1. Bc3 Rxc3 2. Nc7

[Result "85"]
[FEN "1k6/3p4/1B6/4Pp1p/1p5R/1p4p1/pP3n2/K6n w - - 0 1"]

1. Rxh1 Nxh1 2. e6 dxe6 3. Bc7

[Result "86"]
[FEN "N3kb2/pq4p1/4B1P1/1p1P2B1/p7/3P4/2P5/2K5 w - - 0 1"]

1. Bf7 Kd7 2. Be6 Kd6 3. Bf4 Kc5 4. Be3 Kb4 5. Bd2 Ka3 6. Kb1

[Result "87"]
[FEN "8/1B3b1p/7P/p2p4/P2pp1kp/Q7/1N1Pq2P/7K w - - 0 1"]

1. Qh3

[Result "88"]
[FEN "1B2b2k/2N1qr2/4n2p/4p1PQ/1r2N3/1p6/7P/2KB4 w - - 0 1"]

1. Nd5 Rc4 2. Kb1 Rc1 3. Kb2 Rf2 4. Nf2 Rb1 5. Kb1 Qh7 6. g6 Bg6 7. Bc2 bxc2

8. Kc1 Bxh5 9. Be5 Ng7 10. Ne7

[Result "89"]
[FEN "2k4N/Q1np4/2p2Bpp/1p1P4/pPP1p2P/P7/7q/1K6 w - - 0 1"]

1. Nf7 Qg3 2. Qxc7 {win}

[Result "90"]
[FEN "8/4nk2/1p3p2/2rp2pp/1P1R1N1P/6P1/3KPP2/8 b - - 0 1"]

{avoid 1... Rb5}

[Result "91"]
[FEN "5BK1/5p1N/5Pp1/6Pk/8/1b6/8/7q b - - 0 1"]

1... Qa8 2.Kg7 Qd5 {or Qg2 and next Qxg5}

[Result "92"]
[FEN "2b5/1pr4p/3bp1pk/1p6/1PpN2PP/K1P1n3/P3N1R1/3R4 w - - 0 1"]

1. Nxb5 Nxd1 2. Nd6 b5 3. g5 Kh5 4. Nxc8 Rxc8 5. Nf4 Kxh4 6. Nxg6

[Result "93"]
[FEN "8/1p1pNpbk/q2P4/p3p2K/PP2N3/4P1P1/3P4/8 w - - 0 1"]

1. b5 Qb6 2. Nc8

[Result "94"]
[FEN "1rr5/6pk/7p/8/8/7P/1Pb1RRPK/8 b - - 0 1"]

{avoid Rxb2}

[Result "95"]
[FEN "6Q1/8/8/8/8/7k/ppp1p3/brrbK3 w - - 0 1"]

1. Qg1 {win}

[Result "96"]
[FEN "1B1K1k2/4N2p/3pP1pP/6p1/p7/3N2b1/2r2p2/8 w - - 0 1"]

1. Nc6 {win}

[Result "97"]
[FEN "8/4Pr1N/8/6PN/8/3K1ppp/4prkb/4Bbnn w - - 0 1"]

1. Nf8 {win}

[Result "98"]
[FEN "8/b7/3p2b1/5p1n/5Pk1/4P1p1/B5P1/R4K2 w - - 0 1"]

1. Ke2

[Result "99"]
[FEN "5K2/8/5B2/p7/8/p4p2/pn1PpPp1/kb2R3 w - - 0 1"]

1. Bh8 a4 2. Kg7 {win}

[Result "100"]
[FEN "3rqQ2/3ppppp/7k/R7/8/8/1PPP2K1/8 w - - 0 1"]

1. Ra3
[/pgn]

The authors of studies selected to the "IQ" test:

by YACPDB:

Blathy Otto - 3, 12, 13
Benko Pal - 16, 75
Hasek Josef - 22, 28
Gurvich Abram - 23
Kasparyan Genrikh - 24
Neghina Mihai - 27
Grasemann Herbert - 37
Popov Georgy & Hanyan Aleksei - 39 (part of study)
Rudolph William - 46
Troitzky Aleksei - 57
Reti Richard - 58
Matous Mario - 60
Behting Carl - 62
Klyatskin Mikhail - 66
Kubbel Karl - 69
Novomesky Daniel - 73
Lazard Frederic - 74
Marwitz Jan - 79
Lamford Paul - 82
Simkhovich Froim - 86

by other sources:

Solovyov Y. - 6
Babic M. - 10
Neghina Mihai - 11, 31, 84, 87, 89, 92
Simkhovich Froim - 20
van Breukelen Gijs - 36
Hoch Yehuda & Aloni Hillel - 55
Troitzky Aleksei - 59
Smyslov Vasily - 67
Bondarenko F. & Kuznetsov A. - 68
Surya Sekhar Ganguly - 81
Stavrietsky Aleksandr - 88
Kazantsev A. - 93
Ryabinin Nikolaj - 96
Neghina Mihai & Rusz Arpad- 97
Kamody Mario & Neghina Mihai - 98
Fekete Zoltan - 99 (part of study)

Position 35 is part of the study Detour (2010), which has been discussed here in some topics over the years:
White to move and win.
[d]7q/b1p5/1p1Npkb1/pPP2ppP/P1P5/3B2P1/5P1R/K3R3 w - - 0 1
Have fun!

Kornrade wrote: ↑Thu Dec 12, 2019 7:59 pm Position 35 is part of the study Detour (2010), which has been discussed here in some topics over the years:
White to move and win.
[d]7q/b1p5/1p1Npkb1/pPP2ppP/P1P5/3B2P1/5P1R/K3R3 w - - 0 1
Have fun!

Probably here ("IQ" test) are many positions based on studies. The position 35 rather doesn't happen in the solution of your study (King on a1).
The version of "IQ" test seems to be the last and is open (forum) for commentaries.

[d]4b3/8/1P6/3K4/6p1/5pP1/5P1B/7k w - - 0 1
IQ-Test Nr.71:
Analysis by Stockfish 101219 64 BMI2:

1. +- (#33): 1.Kc5 Bg6 2.Kd4 Be8 3.b7 Bb5 4.b8R Bf1 5.Rb1 Kg2 6.Ke3 Bc4 7.Rb4 Be6 8.Rb6 Bc8 9.Rh6 Bf5 10.Kf4 Bd7 11.Rh4 Kxf2 12.Rxg4 Kg2 13.Bg1 Be6 14.Rg6 Kxg1 15.Kxf3 Bd5+ 16.Kf4 Kf2 17.g4 Bc4 18.g5 Ke2 19.Rd6 Bg8 20.g6 Bc4 21.Ke5 Bg8 22.Rd8 Ba2 23.Rd5 Bxd5 24.Kxd5 Kd2 25.Kd4 Ke2 26.g7 Kf3 27.g8Q Kf4 28.Qf7+ Kg4 29.Ke3 Kg5 30.Kf3 Kh6 31.Qg8 Kh5 32.Qg7 Kh4 33.Qg4#
2. +- (#33): 1.b7 Bb5 2.b8R Ba6 3.Rb6 Bd3 4.Kd4 Bf1 5.Rb1 Kg2 6.Ke3 Bc4 7.Rb4 Be6 8.Rb6 Bc8 9.Rh6 Bf5 10.Kf4 Bd7 11.Rh4 Kxf2 12.Rxg4 Kg2 13.Bg1 Be6 14.Rg6 Kxg1 15.Kxf3 Bd5+ 16.Kf4 Kf2 17.Rd6 Bb3 18.g4 Ke2 19.g5 Bf7 20.g6 Bb3 21.Ke5 Bg8 22.Rd8 Ba2 23.Rd5 Bxd5 24.Kxd5 Kd2 25.Ke5 Ke3 26.g7 Ke2 27.g8Q Kd3 28.Qb3+ Ke2 29.Qc3 Kf1 30.Qb2 Kg1 31.Ke4 Kh1 32.Kf3 Kg1 33.Qg2#

(, 24.12.2019)

1.b7 AND 1.Kc5, both are mate in 33# (After a long try with backwards/forwards, 3cores @ 3.7GHz and 16GB Hash)

And the transformation into a rook is necessary (2.b8R or 4.b8R)

Paloma wrote: ↑Tue Dec 24, 2019 2:06 am And the transformation into a rook is necessary (2.b8R or 4.b8R)

All is ok. The move 1.Kc5 instead of 1.b7 makes the solution only a bit longer without any sense.