New test set 'pure'

[peter]

Another one cyclic zugzwang position is nr.126

n7/b1p1K3/1pP4p/1P4p1/6p1/1p4Pn/1P2N1br/3NRn1k w - - 0 1

No original source is given and even if the position was discussed here already several times I couldn't find any author so far neither. Position is in Chest database too, DTM126 will be reached with best move 1.Kf6 only, but e.g. 1.Kf8 (?!) will delay mate for 2 moves only again, eg. with 1...Bb8 2.Ke7 Ba7 having reached original starting position again.
Don't want to be misunderstood, as for mate in x problem that's not a dual, yet for a test position for engines in automatically evaluated suite it's not so good as for my pov, regards

[peter]

130

qnb5/rp1p4/pPpP4/P1P4k/2P2KN1/8/8/8 w - - 0 1

Didn't find author neither so far, given DTM of 42 seems to be too long

qnb5/rp1p4/pPpP4/P1P4k/2P2KN1/8/8/8 w - - 0 1

Analysis by The Huntsman 1:

1.Sf2 Kh4 2.Kf3 Kh5 3.Ke3 Kg5 4.Ke4 Kh5 5.Kf5 Kh4 6.Kf4 Kh5 7.Sh3 Kg6 8.Sg1 Kh5 9.Sf3 Kg6 10.Sd4 Kh6 11.Kf5 Kh5 12.Sf3 Kh6 13.Sh4 Kh5 14.Sg2 Kh6 15.Sf4 Kg7 16.Sh5+ Kf7 17.Kg5 Ke6 18.Kf4 Kf7 19.Kf5 Kg8 20.Kg6 Kf8 21.Sf4 Kg8 22.Sd3 Kf8 23.Se5 Kg8 24.Sf7 Kf8 25.Sh6 Ke8 26.Sg8 Kd8 27.Se7 Ke8 28.Sxc8 Kd8 29.Sxa7 Ke8 30.Sc8 Kf8 31.Se7 Ke8 32.Kg7 Kd8 33.Kf7 Da7 34.bxa7 b6 35.axb8D#
+- (#35) Tiefe: 96/72 00:01:16 4169MN

qnb5/rp1p4/pPpP4/P1P4k/2P2KN1/8/8/8 w - - 0 1

Analysis by The Huntsman 1:

1. +- (#35): 1.Sf2 Kh4 2.Kf3 Kh5 3.Ke4 Kg5 4.Ke5 Kh5 5.Kf5 Kh4 6.Kf4 Kh5 7.Sh3 Kg6 8.Sg5 Kh5 9.Sf3 Kh6 10.Sh4 Kh5 11.Sf5 Kg6 12.Sg3 Kf6 13.Sh5+ Kg6 14.Kg4 Kh6 15.Sf4 Kg7 16.Kg5 Kf7 17.Sh5 Ke6 18.Kf4 Kf7 19.Kf5 Kg8 20.Kg6 Kf8 21.Sf4 Kg8 22.Sd3 Kf8 23.Se5 Kg8 24.Sf7 Kf8 25.Sh6 Ke8 26.Sf5 Kd8 27.Se7 Ke8 28.Sxc8 Kd8 29.Sxa7 Ke8 30.Sc8 Kf8 31.Se7 Ke8 32.Kg7 Kd8 33.Kf7 Da7 34.bxa7 b6 35.axb8D#

2. +- (#37): 1.Kg3 Kg6 2.Kf4 Kh5 3.Sf2 Kh4 4.Kf3 Kh5 5.Ke4 Kg5 6.Ke5 Kh5 7.Kf5 Kh4 8.Kf4 Kh5 9.Sh3 Kg6 10.Sg5 Kh5 11.Sf3 Kh6 12.Sh4 Kh5 13.Sf5 Kg6 14.Sg3 Kf6 15.Sh5+ Kg6 16.Kg4 Kh6 17.Sf4 Kg7 18.Kg5 Kf7 19.Sh5 Ke6 20.Kf4 Kf7 21.Kf5 Kg8 22.Kg6 Kf8 23.Sf4 Kg8 24.Sd3 Kf8 25.Se5 Kg8 26.Sf7 Kf8 27.Sh6 Ke8 28.Sf5 Kd8 29.Se7 Ke8 30.Sxc8 Kd8 31.Sxa7 Ke8 32.Sc8 Kf8 33.Se7 Ke8 34.Kg7 Kd8 35.Kf7 Da7 36.bxa7 b6 37.axb8D#

[peter]

Nr.135 starts after 180 moves of O.Blathy- study with

rBb5/P2p2K1/P2Pp3/1B1p4/2prn3/1Rnk1p2/1b1p1p1p/3B1N1N w - - 0 1

Analysis by The Huntsman 1:

1. +- (#31): 180.Kf8 Lc1 181.Ke7 Lb2 182.Kd8 Lc1 183.Kc7 Lb2 184.Kb6 Lc1 185.Ka5 Lb2 186.Kb4 La1 187.Ka3 e5 188.Kb4 Lb2 189.Ka5 Lc1 190.Kb6 Lb2 191.Kc7 Lc1 192.Kd8 Lb2 193.Ke7 Lc1 194.Kf8 Lb2 195.Kg7 Lc1 196.Kh6 Lxa6 197.Lxa6 Lb2 198.Kg7 Lc1 199.Kf8 Lb2 200.Ke7 La1 201.Kd8 Lb2 202.Kc7 Lc1 203.Kb6 Lb2 204.Ka5 La1 205.Lb5 Txa7+ 206.Lxa7
2. +- (#33): 180.Kh8 Lc1 181.Kg7 Lb2 182.Kf8 Lc1 183.Ke7 Lb2 184.Kd8 Lc1 185.Kc7 Lb2 186.Kb6 Lc1 187.Ka5 Lb2 188.Kb4 La1 189.Ka3 e5 190.Kb4 Lb2 191.Ka5 Lc1 192.Kb6 Lb2 193.Kc7 Lc1 194.Kd8 Lb2 195.Ke7 Lc1 196.Kf8 Lb2 197.Kg7 Lc1 198.Kh6 Lxa6 199.Lxa6 Lb2 200.Kg7 Lc1 201.Kf8 Lb2 202.Ke7 La1 203.Kd8 Lb2 204.Kc7 Lc1 205.Kb6 Lb2 206.Ka5

[Ajedrecista]

Hello Peter:

130

qnb5/rp1p4/pPpP4/P1P4k/2P2KN1/8/8/8 w - - 0 1

Didn't find author neither so far, given DTM of 42 seems to be too long

[...]

That one is undoubtedly based on this cooked problem of 1891:

https://yacpdb.org/#284718
https://pdb.dieschwalbe.de/P1298591

The original source can be found at Google Books (problem No. 135):





Regards from Spain.

Ajedrecista.

[Ajedrecista]

Hello Peter:

Another one cyclic zugzwang position is nr.126

n7/b1p1K3/1pP4p/1P4p1/6p1/1p4Pn/1P2N1br/3NRn1k w - - 0 1

No original source is given and even if the position was discussed here already several times I couldn't find any author so far neither. Position is in Chest database too, DTM126 will be reached with best move 1.Kf6 only, but e.g. 1.Kf8 (?!) will delay mate for 2 moves only again, eg. with 1...Bb8 2.Ke7 Ba7 having reached original starting position again.
Don't want to be misunderstood, as for mate in x problem that's not a dual, yet for a test position for engines in automatically evaluated suite it's not so good as for my pov, regards

This one is undoubtedly based on this problem of 1952:

https://yacpdb.org/#305074
https://pdb.dieschwalbe.de/P1299273

Regards from Spain.

Ajedrecista.

[peter]

Thanks a lot, Jesus, will add the infos to my own databases, but in the meantime I made a new .epd 10 positions smaller out of Dann's suite, removing all the above shown doubtful ones, among those the two of them you found the sources of, so here these aren't included anymore anyhow:

Code: Select all

1B6/8/4K2p/R6p/1PP4P/1P2p3/1pppp1p1/1kqrrbQ1 w - - bm Rxh5; hmvc 0; id "Miloseski, B?._?_pure 01, 1";
1n6/2B5/2pP4/8/1p2N3/7p/3K2p1/6kr w - - bm d7; hmvc 0; id "Krosny=M_(+0314.14d2g1)_Szachy#48, 2";
1N6/pk2p1q1/1p2p2p/P6P/3N2p1/6P1/2K5/5R2 w - - bm a6+; am Nbc6; hmvc 0; id "Polasek, J._(+3102.36c2a6)_pure03, 3";
1r1q3k/6pp/p2P2Q1/p3p3/b1B5/6P1/3P1R2/6K1 w - - bm Bd3; am Rh2; hmvc 0; id "Minski=M Pervakov=O_(+4440.36g1f7)_pure05, 4";
2B5/1pp4K/8/2Rp1Npk/4p1p1/r7/2bp2N1/b3r3 w - - bm Rc3; hmvc 0; id "Kozdon, Baldur?_?_pure07, 5";
2B5/5pPb/2P3nP/6P1/5P1r/7p/8/2K2N1k w - - bm f5; am c7; hmvc 0; id "Pervakov=O Sumbatyan=K_(+0344.52c1h1)_pure08, 6";
2b5/n1p5/1p1pP2p/1P1P4/P7/6K1/1N6/k7 w - - bm Nc4; hmvc 0; id "Jahn=G_(+0034.44g3a1) U2_pure09, 7";
2K2Nqk/2N1pp2/6Pb/7P/2p1P1B1/2P5/8/6B1 w - - bm Bd4+; hmvc 0; id "Jasik=A_(+3052.43c8h8)_pure10, 8";
1r6/1pPp1pBp/1P1P1P1P/1K6/P3p3/8/ppp1P2P/qkn4R w - - bm cxb8=N; hmvc 0; id "Zinar=M_(+3413.88b5b1) TW_pure06, 9";
2kr4/2Np3q/2pPPp2/p1P2P2/2N1R3/8/5P2/4K3 w - - bm exd7+; am e7; hmvc 0; id "Panaiotov=P_(+3402.55e1c8)_pure11, 10";
2n3k1/p5p1/3p1pPP/1PpP1p2/2p2P2/1bP5/2R1P2r/R4K2 w - - bm h7+; hmvc 0; id "Timman=J_(+0533.77f1g8)_pure12, 11";
2N4r/5p1P/5p1k/5K1p/7P/1b6/3P4/6R1 w - - bm Rg8; am Ne7; hmvc 0; id "Cortlever=N_(+0431.33f5h6) U2_pure13, 12";
2Nn1qk1/1p1pQ1p1/1P1P2K1/6N1/3p1p1b/3P1P2/8/8 w - - bm Qxd8; hmvc 0; id "Kazantsev=A_(+4035.45g6h8) (v)_pure14, 13";
2Q5/8/7B/5N2/8/2Pp1P1R/1N2q2p/2K1kb1r w - - bm Qe6; hmvc 0; id "Timman, ?._Arves, 04202_pure15, 14";
2r3q1/1Ppp1r2/pP1N1k2/3Pp3/P1p1p2p/n1P1P1P1/1B6/4K2R w K - bm O-O+; am Rf1+; hmvc 0; id "Borodavkin=S_(+3714.77e1f6) U2_pure16, 15";
2R4B/4K3/8/7p/6pP/pp3pP1/pr2pP2/kn5R w - - bm Rc3; hmvc 0; id "Timman=J_(+0543.68e7a1)_pure17, 16";
2R5/8/pP1K4/4P3/7r/4pp1p/2RB3p/5nkr w - - bm Be1; hmvc 0; id "Keith=D_(+0813.25d6g1)_pure18, 17";
2r5/p4p2/1R3p1K/p2kN3/4R3/2r4P/1B6/8 w - - bm Rd4+; am Bxc3; hmvc 0; id "Holmqvist=G_(+0811.14h6d5)_pure19, 18";
2RN1q2/3pp1p1/5p1p/1pp4k/5P1P/1B6/6K1/8 w - - bm Kh3; am Kg3; hmvc 0; id "Avni=A_(+3111.27g2h5)_pure20, 19";
3K3k/b1ppP1pB/r1r1p3/6pb/1n4N1/qpp2p2/QRR5/8 w - - bm Bg6; hmvc 0; id "Arves.06495_#15_pure21, 20";
3Q4/6Kp/7P/1P6/B7/pP3P2/1ppppp1p/1rbqkn1R w - - bm Qd3; hmvc 0; id "Unknown, A._#9_pure22, 21";
3R2Kn/5P2/Rp2p1pb/1np4p/1kP5/2p1p2r/B1p1NrbB/8 w - - bm Rda8; hmvc 0; id "Karbowiak, U?._#6_pure23, 22";
3R4/2p5/4ppN1/6pk/2P1P1q1/3PP3/P4K2/8 w - - bm Ne5; hmvc 0; id "Gerhold=J_(+3102.54f2h4)_pure24, 23";
3r4/7b/3pNpnk/4N3/8/4P3/5KP1/8 w - - bm Nf7+; am Ng4+; hmvc 0; id "Atlas=D_(+0435.32f2h5)_pure25, 24";
3rk2r/2Pppp2/6Pp/2K5/3p1N2/8/4B3/8 w k - bm g7; hmvc 0; id "Garcia, M?._JT75_pure26, 25";
4k3/8/5K2/8/8/3pNNp1/1P1P1qP1/8 w - - bm Ke6; hmvc 0; id "Kekely=L_(+3002.32h6h8) U2_pure28, 26";
4Q3/ppp3p1/8/8/3p4/8/1ppp2K1/br1k3n w - - bm Qh5+; hmvc 0; id "Miljanic, Mirko_?_pure30, 27";
4rb2/1p1q1ppk/p1n1p2p/2p1Pn2/3PNR2/P1P2K2/3QBP2/6R1 w - - bm Rxf5; hmvc 0; id "Hashimar, Al?_Un, published?_pure31, 28";
5B1k/2r5/4NN2/p6P/5p2/6pn/3b4/K4R2 w - - bm Rc1; am h6; hmvc 0; id "Minski=M_(+0445.13a1h6)_pure32, 29";
5bq1/4p1p1/4P1P1/5K2/2P1P1B1/5RP1/4p3/3k4 w - - bm Rf4; am Rf1+; hmvc 0; id "Pitkanen=J_(+3140.53f5d1)_pure33, 30";
5n2/p3p2p/P5P1/1K1PP1P1/1p4p1/1kp1Q1P1/prr5/qb1B4 w - - bm Qb6; hmvc 0; id "Krug, P._?_pure34, 31";
5r2/8/8/6PN/3Q4/1K3ppp/4prkb/4Bbnn w - - bm Qd8; hmvc 0; id "Unknown, A.._#11_pure35, 32";
5R2/K7/3B4/8/p5p1/p5pp/P5kp/7b w - - bm Ka6; hmvc 0; id "Gameknot, ?._#19_pure36, 33";
5rk1/2pq2pp/3Pb3/RP2p2r/1n3p2/1Q6/1P3P1N/1BB2RK1 w - - bm Qxb4; hmvc 0; id "Unknown, S._?_pure37, 34";
6B1/7p/7P/1R6/p7/8/pbp1p1PK/rkrbR3 w - - bm Kh1; hmvc 0; id "Unknown, A._#9_pure38, 35";
6bk/p4n1p/6pP/8/3p3p/3Pp2P/1p2P1KB/bB6 w - - bm Bf4; hmvc 0; id "Timman=J_(+3083.67g2h8)_pure39, 36";
6bq/8/3p2PN/3pk3/1K2p3/P5N1/2P2P2/4B3 w - - bm Bc3+; am Ngf5; hmvc 0; id "Avni=A_(+3042.43b4e5)_pure40, 37";
6br/5pp1/3K2kp/5N1N/4BP2/8/8/n7 w - - bm Ke7; am Nfxg7+; hmvc 0; id "Krug=P_(+3455.13b6h7) TT_pure41, 38";
6k1/3K4/1p5p/1Pp5/8/1P6/P1Bb1P2/8 w - - bm Kc6; hmvc 0; id "Salai, Ladislav Jr._?_pure42, 39";
6k1/7p/7P/1p3r2/8/8/PP2P1p1/3Q2Kb w - - bm Qb3+; am Qd8+; hmvc 0; id "Kopyl=V Pogorelov=V_(+1330.43g1g8) TT_pure43, 40";
6N1/8/1nkB4/6b1/2N5/8/2K3p1/6Rb w - - bm Ne5+; am Nxb6; hmvc 0; id "Aberman=V_(+0175.11c1c7)_pure44, 41";
6N1/p1p1p1p1/P1P1P1P1/8/1KP5/3p1Bpp/3P2rq/R5bk w - - bm Nh6; hmvc 0; id "Timman=J_(+3740.77c3h1)_pure45, 42";
6n1/R1B4P/5nPr/1Pp3p1/p1k5/4P3/pK6/8 w - - bm b6; am hxg8=Q+; hmvc 0; id "Sidorov=B_(+0416.44b2c4) (c)_pure46, 43";
6r1/1B6/P1P4k/qP1pp1p1/n3Pr1p/3Q1P1R/2K5/1R6 b - - bm Rgf8; hmvc 0; id "Unknown, S._?_pure47, 44";
6rk/p1q1r2p/2pnbR1P/4p3/2p1P1p1/P5P1/1R6/2BB1QK1 w - - bm Bg5; hmvc 0; id "Unknown, S._?_pure48, 45";
7B/1p6/1Rb5/k1K5/2BN4/2p1N3/PrP4p/6q1 w - - bm Ra6+; hmvc 0; id "Rowson=H_(+3452.23c5a5)_pure49, 46";
7k/6nP/1b1P4/1qB3Np/6PK/2Q5/p2p1p2/8 w - - bm Bd4; hmvc 0; id "Kozirev, V._HHdb, HHdb_pure 50, 47";
7n/3P3k/n2K3p/2p5/1b4N1/2p1p1P1/8/3B4 w - - bm Nf6+; am d8=Q; hmvc 0; id "Van Breukelen=G_(+0047.24d6h7) (c)_pure51, 48";
7n/3P4/n2K2kp/2p4N/Bb6/2p1p1P1/8/8 w - - bm Bc2+; hmvc 0; id "Rusz, Arpad_After, G.v.Breukelen_pure52, 49";
7n/5pbp/3Q4/N3rk1K/b3ppN1/4pr1n/4B3/8 w - - bm Bc4; hmvc 0; id "Kozdon, B?._?_pure53, 50";
7n/k6P/3N4/8/3K4/1p6/pP6/1b4R1 w - - bm Nb5+; am Rg7+; hmvc 0; id "Kekely=L_(+0134.22d4a7)_pure54, 51";
7r/3k3P/8/3B4/1P2K3/Np6/pp6/1N6 w - - bm Bg8; hmvc 0; id "Infantozzi=J_(+0312.23e4c7) U2_pure55, 52";
7r/5p1q/3p1pp1/6Pk/1P6/p4PRK/3P2P1/4R3 w - - bm Kh2; hmvc 0; id "Unknown, A._?_pure56, 53";
7R/qp6/bp6/1p4K1/1P1k4/1P6/1P6/8 w - - bm Kf6; hmvc 0; id "Shinkman=W_(+3130.34h3g1)_pure57, 54";
8/1b4K1/4p3/7k/1p2p3/1pp1P3/3p1NPP/1R6 w - - bm Rg1; am g4+; hmvc 0; id "Krug=P_(+0131.36g7h5) TT_pure58, 55";
8/1K2B3/1b6/k5p1/3p4/3B4/6p1/6Nb w - - bm Kc6; hmvc 0; id "Aitov=F Dolgov=V_(+0081.03c6a4)_pure59, 56";
8/1k6/pNq3p1/b6p/PB6/K4p2/QP5P/8 w - - bm Qf7+; am Nc4; hmvc 0; id "Joseph=F_(+4041.34a3b7)_pure60, 57";
8/1p3p2/8/1P1NP3/B4K2/2R5/pkPp4/8 w - - bm Rb3+; am Rd3; hmvc 0; id "Nestorescu=V_(+0111.34f4b2) U2_pure61, 58";
8/1p4P1/bP6/rp4kN/rp6/bP6/1pP5/1K6 w - - bm Ng3; hmvc 0; id "Mandinyan=R_(+0661.44b1g5)_pure62, 59";
8/1ppK3b/5Bp1/3k1PP1/N2p1RN1/2bP3p/5p2/5n1q w - - bm Be7; hmvc 0; id "Unknown, A._#7_pure 64, 60";
8/2B1p3/1p6/3p3p/1K1k1Nq1/2pP3p/2B2P1P/8 w - - bm Bb1; hmvc 0; id "Garcia=M_(+3321.68a1d4)_pure65, 61";
8/2B5/1N6/5k2/4N3/6p1/5prp/5Kbn w - - bm Nc5; hmvc 0; id "Seoane=J_(+0345.03e2c6)_pure66, 62";
8/2K5/3p2p1/3kp1Qn/P7/1P6/1q2P3/4N3 w - - bm e4+; hmvc 0; id "Slumstrup Nielsen=S Minski=M_(+4004.33c7d5)_pure68, 63";
8/2p1q3/p3P3/2P2k1p/1P1P3P/2N3P1/4B2K/8 w - - bm Nd5; hmvc 0; id "Troitzky, 1928_?_pure69, 64";
8/2p3pk/5R1P/R3P2K/2B1p1pP/P3q3/1Qp5/2r4r w - - bm Bg8+; hmvc 0; id "Kozirev, ?._?_pure70, 65";
8/2p4p/4p3/1pp2p2/8/8/5p2/1Q2rk1K w - - bm Qxb5+; hmvc 0; id "Krejcik=J_(+1400.08h1e2)_pure71, 66";
8/2Q5/8/8/1k1p4/4p1p1/3prpp1/3Kbbrn w - - bm Qh7; am Qb7+; hmvc 0; id "Halumbirek_?_pure72, 67";
8/3b1p2/6pp/p3k1P1/P3P1RP/4P3/5rn1/2KB4 w - - bm Rxg2; am gxh6; hmvc 0; id "Marinescu=M_(+0443.54c1e5)_pure73, 68";
8/3B3p/5k2/B7/1p5P/5K2/npN1N2P/8 w - - bm Na3; am Nxb4; hmvc 0; id "Sonntag=G_(+0025.23f3f6)_pure74, 69";
8/3p1p2/3p1p2/3pPp2/3pk3/6P1/2P1KP2/8 w - - bm e6; am f3+; hmvc 0; id "Akerblom=A_(+0000.47e2e4)_pure75, 70";
8/3p3p/2pP4/2p2p1P/5Pp1/B1R3Pp/5p1k/5Kbr w - - bm h6; hmvc 0; id "Gameknot, ?._?_pure76, 71";
8/3P4/n2K2kp/2p1n2N/1b6/2p1p1P1/8/3B4 w - - bm Bc2+; hmvc 0; id "VanBreukelen_Simplifikation_pure77, 72";
8/3p4/p2P4/P7/p4N2/rpK1p1pp/1p2Bkbr/bR5n w - - bm Kd4; hmvc 0; id "Gameknot, !._?_pure78, 73";
8/3PBp1p/5P1P/2p5/2K5/pp2p3/rpp1P2P/qkn4R w - - bm Kb5; hmvc 0; id "Zinar=M_(+3713.88d5b1)_pure79, 74";
8/3pR3/3pqp2/3pkpNK/3p1p2/8/2P1p3/3N4 w - - bm Rxe6+; am Nf3+; hmvc 0; id "Bent=C_(+3412.18h5e4) (c)_pure80, 75";
8/4p3/3p1p2/1PpP2N1/2P3K1/p1p1N3/rpPpQ3/kn5r w - - bm Qd1; hmvc 0; id "Campioli=M_(+1605.48g4a1)_pure81, 76";
8/4p3/p7/p1N4B/1kp5/1p1p4/P1R5/b2K4 w - - bm Rc1; am Nxa6+; hmvc 0; id "Sonntag=G_(+0141.16d1b4)_pure82, 77";
8/4q3/p7/3p1p1p/3B1k2/p1PP1N1P/P4K2/8 w - - bm Bb6; hmvc 0; id "Troitzky=A_(+3011.55f2h4) (c)_pure83, 78";
8/5kP1/5p1P/1p1p1p1K/1p1Pbp2/1P1p1p2/1P1P1P2/7B w - - bm Kh4; hmvc 0; id "Dittmann=W_(+0040.78h5f7)_pure84, 79";
8/5P1p/7P/2K1p3/8/1pP2p2/ppp1pP2/qkn4R w - - bm f8=N; hmvc 0; id "Zinar=M_(+3103.78c5b1)_pure85, 80";
8/5P2/6N1/4p3/4R3/4P1pB/3Kp1pP/5brk w - - bm Ke1; am f8=Q; hmvc 0; id "Krug=P Garcia=M_(+0441.44e1h1)_pure86, 81";
8/6B1/6P1/8/p7/3p4/prpPp3/kbR1K3 w - - bm Bh8; hmvc 0; id "Fekete=Z_(+0440.25e1a1)_pure87, 82";
8/8/1qp2Q2/8/7n/2P4p/p6p/R3K2k w Q - bm Ke2+; am O-O-O+; hmvc 0; id "Gonzalez=L_(+4103.14e1h1)_pure88, 83";
8/8/1r2n1n1/b2ppkpN/1p2b1p1/2N5/K3Q2p/8 w - - bm Qxe4+; hmvc 0; id "Kalashnikov=V Pankratiev=A_(+1368.06a2f3)_pure89, 84";
8/8/2P2B2/N2N3r/r5p1/4K1Q1/p5p1/6kb w - - bm Nb3; hmvc 0; id "Uapa, ?._?_pure90, 85";
8/8/3k2p1/6pb/3P2p1/1P6/1P3N2/4K3 w - - bm Ne4+; hmvc 0; id "Smyslov, V._?_pure91, 86";
8/8/3p3k/5K1p/5p2/5p2/B4N1p/B4b2 w - - bm Bg8; hmvc 0; id "Gogberashvili=M_(+0051.05f5h6)_?, 87";
8/8/5p1r/2R2p2/5pp1/3kp1N1/4Nn1P/1Kb5 w - - bm Rc3+; hmvc 0; id "Zlatanov=A_(+0435.15b1d3) (c)_pure93, 88";
8/8/7k/8/4Q3/8/3p1pp1/3Kbrrb w - - bm Qb7; hmvc 0; id "Halumbirek, J._?_pure94, 89";
8/8/8/1pQ5/3p4/1k1p4/pp1p4/rrbK4 w - - bm Qxd4; hmvc 0; id "Halumbirek=J_(+1630.06d1c4) U2_pure95, 90";
8/8/8/4p2R/2p5/2p4B/p1p1p3/rbK1k3 w - - bm Rf5; am Bg4; hmvc 0; id "Becker=R_(+0440.06c1e1)_pure96, 91";
8/8/p7/8/1p6/2p5/p1p1K3/qbk2N1Q w - - bm Nd2+; hmvc 0; id "Gorgiev=T_(+4032.05e2b2)_pure97, 92";
8/K3p3/5q2/5b2/1Np5/Bp6/p4Q2/k7 w - - bm Qf1+; hmvc 0; id "Somov Nasimovich=E_(+4041.04b6b1)_pure99, 93";
8/k7/2Pp1p1p/2pP3P/2p2p2/2p2p2/K1P2P2/8 w - - bm Kb1; hmvc 0; id "Zinar, M._?_pure99, 94";
8/k7/3Q4/8/3p4/1p1p4/pp1p4/rrbK4 w - - bm Qd5; hmvc 0; id "Halumbirek, J._?_pure100, 95";
8/p1p1P3/P1P5/2P5/5Kp1/3p1Pp1/3p1ppb/3R1bkq w - - bm e8=N; hmvc 0; id "Zimbeck=D_(+3160.78e4g1)_pure101, 96";
8/p1p1P3/P1P5/5p1p/7P/p2P1K2/rpp5/qkn1R3 w - - bm e8=N; hmvc 0; id "Bron=V_(+3434.67g2b1)_pure102, 97";
8/P6b/8/2p3Bp/7K/4N3/ppp5/2k5 w - - bm Nc4+; am Nd5+; hmvc 0; id "Krug=P_(+0041.15h4c1)_pure103, 98";
8/P6K/6pp/1p1P2pk/P2P4/1Pp3P1/2Bp3n/1b6 w - - bm Bd1+; hmvc 0; id "Slepyan=G_(+0043.66h7h5)_pure104, 99";
8/pn2p3/k3N3/1n6/2N4p/5p1p/5K2/8 w - - bm Kg1; hmvc 0; id "Blum=N_(+0028.05e3a6)_pure105, 100";
8/pp1p4/7R/k1KN4/p1pN4/8/q1P5/8 w - - bm Ra6+; hmvc 0; id "Ulanov=L_(+3102.15c5a5)_pure106, 101";
8/pp5p/3BK3/4p1kP/nQ4p1/3pP1Pp/1p5P/r1n1qN2 w - - bm Nd2; hmvc 0; id "Rossi, P._?_pure107, 102";
8/pp6/8/K1P5/1pk4p/6p1/PP1RP3/8 w - - bm c6; am e3; hmvc 0; id "Wotawa=A_(+0100.45a5c4) (c)_pure108, 103";
8/pppp4/3k1p2/1q4p1/1N6/P2PN3/P1BPPpP1/5K2 w - - bm a4; hmvc 0; id "Somov Nasimovich=E_(+3012.67f1d6)_pure110, 104";
b2B4/rN3p1p/kPB5/p1p5/P4p1p/5P1P/2r2P1K/8 w - - bm Kg1; hmvc 0; id "Soukup=M_(+0651.56d2a6)_pure111, 105";
brn3r1/k6N/3P4/K2PR3/2BN4/8/8/8 w - - bm Re6; am d7; hmvc 0; id "Bazlov=Y_(+0775.31c5a6)_pure112, 106";
k1b3n1/1p1pBp2/1P1PpPp1/6P1/8/p1p3P1/PpK1N2b/qB6 w - - bm Bf8; hmvc 0; id "Melnichenko=E_(+3084.68c2a7)_pure113, 107";
K2B1n2/3p1r2/N1Pp4/3N2R1/p1p1p3/k7/Pp3p2/1Bb3q1 w - - bm Nab4; hmvc 0; id "Karbowiak, U._?_pure114, 108";
k3b2q/1RK1pnQ1/1Pnp3r/6R1/8/2N5/8/r7 w - - bm Na2; hmvc 0; id "Nissl, T._?_pure115, 109";
k4B2/1p3p2/1P2P2R/7K/3pp1pN/7q/1np5/3b2Q1 w - - bm Qg3; hmvc 0; id "Jasik=A_(+4145.26h5a8)_pure116, 110";
k4n2/1R6/p1B1p3/5p1K/1N4p1/2p1p2p/r3p3/4b3 w - - bm Bh1; hmvc 0; id "Kozdon, B.._?_pure117, 111";
k5br/2R1pp2/1K5q/1p3PPr/3Np3/4N2p/2n4p/8 w - - bm f6; am g6; hmvc 0; id "Roxlau=M_(+3778.38a3c8)_pure118, 112";
K6n/1BR1p1N1/1P1kP1br/3pnp1q/p1pP4/r6p/P4B2/2b5 w - - bm Be1; hmvc 0; id "Karbowiak, U.._?_pure119, 113";
k7/2p5/2K5/1PPP1B2/P2r3p/1P6/1p6/8 w - - bm d6; am Kxc7; hmvc 0; id "Mitrofanov=L Belyavsky=A_(+0310.53c6a8) (c)_pure120, 114";
k7/4pp2/2K3r1/1P2P3/2p5/2p1p3/5pP1/3R4 w - - bm e6; am Kc7; hmvc 0; id "Kostadinov=D Stanchev=L_(+0800.46d5b7)_pure121, 115";
kb6/2r5/pPP3p1/P2B2p1/8/6p1/7P/6K1 w - - bm Kh1; am hxg3; hmvc 0; id "Bron=V_(+0340.54g1a7)_pure123, 116";
krb5/bn1p3p/3p4/2pB1p2/2P5/2p2p2/2P2P1P/R4K2 w - - bm Ke1; hmvc 0; id "Kovalenko=V_(+0473.67e1a8)_pure124, 117";
krn5/pp2p3/1q1pN2b/3B2r1/3R1pPp/2P1B3/5P1p/6QK w - - bm Qb1; hmvc 0; id "Dinis de Sousa=J & P_(+4754.37h1a8)_pure1625, 118";
nk3b2/r7/3P1pp1/5R2/2K2B2/8/1P6/8 w - - bm d7+; hmvc 0; id "Josten=G_(+0443.22c4b8)_pure127, 119";
nKB1k3/2p1p2R/1p2N3/1P1P2Pb/6p1/6Rr/pNp1p1r1/6b1 w - - bm d6; hmvc 0; id "Stjoptschkin, A._?_pure128, 120";
Q4r2/8/5p1p/4nP1k/p1Q4P/p1n3bK/4b1P1/8 w - - bm Qxf8; hmvc 0; id "Joseph=F_(+1366.54h3h5) TT_pure129, 121";
r1b5/Np1p1p2/1PpP1P2/3p4/6p1/2P1PpPk/5BrP/5B1K w - - bm Be1; hmvc 0; id "Rewitz=P_(+0651.77h1h3) U2_pure131, 122";
R3b1nq/N1K3p1/k1p2p2/8/p1p4P/1n3r1B/rN1P4/8 w - - bm Bf1; hmvc 0; id "Unknown, A._?_pure132, 123";
r6r/6pk/p7/4p3/4Npnq/8/1RBR1Qn1/3b1K2 w - - bm Ng5+; hmvc 0; id "Daniel=A_(+4847.04f1h7)_pure133, 124";
R7/5p1B/1p6/3pP3/6pp/7p/2N4p/1K5k w - - bm Ne3; hmvc 0; id "Tarnopolsky=K_(+0111.17b1h1) (c)_pure134, 125";
rk3q2/pP1p4/K2p3R/3R3B/4P3/8/8/8 w - - bm Bf7; am bxa8=Q+; hmvc 0; id "Timman=J_(+3510.23a6c8)_pure136, 126";
rn3b2/3p1N2/4p1N1/4PkPK/p2B1PpP/1PPPRp1b/3n1p2/5r2 w - - bm Re2; hmvc 0; id "Scheffler, G._?_pure137, 127";
rnbqkbnr/pppppppp/8/1Q2R2B/4N1N1/8/8/5K2 w - - bm Re6; hmvc 0; id "Van Essen=M_(+4778.08f1e8)_pure138, 128";

Here are again two first runs with 15" (just to see the changes to the bigger suite of before), Crystal had 28 threads of 16x3.5GHz CPU, Lc0 had 2, the 3070ti GPU and the 2790M- net.

Crystal 6 PMT solved 110/128:

Code: Select all

         1   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16  17  18  19  20
 -------------------------------------------------------------------------------------
   0 |   -   0  15   5   0   0   2   0   -   0   0   0   0   0   0   0   0   0   0   0
  20 |   0   2   3   0   0   4   -   0   0   1   0   -   4   -   2   2   0   0   3   -
  40 |   1   -   3   4  15   0   -   6   0   0   2   0   0   -  10   0   0   0   -   0
  60 |   0   -   0   0   3   -  15   3   -   1   0   2   0   -   3   8   -   2   0   0
  80 |   0  15   0   0   3   0   8   0   2  15   0   1   1   -   0   1   4   0   0   0
 100 |   0   4   1   1   1   0   -   1   0   0   0   1   0   1   3   0   1   0   0   0
 120 |   0   -   1   0   0   0   0   0

  K/s: 40.106.601  
  TotTime: 13:46m    SolTime: 8:06m

And Lc0 v0.31.0-dag+git.e429eeb0 solved 79/128:

Code: Select all

         1   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16  17  18  19  20
 -------------------------------------------------------------------------------------
   0 |   -   0   -   -   0   0   -   2   -   1   0   0   8   3   -   0   0   0   -   0
  20 |   -   -   0   -   -   0   -   0   5   0   0   9   -   -   -   2   -   -   0   0
  40 |   -   -   2   0   -   0   0   0   0   1   0   0   -   2   0   0   2   -   1   7
  60 |   0   -   0   -   0   0   -   0   -   -   -   9   0   -   0   6   0   0   -   -
  80 |   -   1   0   0   1   0   -   5   -   -   0   -   -   0   -   -   -   6   -   0
 100 |   0   -   0   -   -   -   0   -   0   0   6   -   5   0   -   0   5   0   3   0
 120 |  11   0   3   5   -   5   1   0

  K/s: 44.869  
  TotTime: 11:55m    SolTime: 9:56m

Seems that with this one smaller suite 15"/pos."are rather ok than that was the case as for the bigger one, at least SMP with good hardware and the best engines as for solving such problems. Of course the positions are still very special, favoring engines with refined code for mate- problems but that's an interesting ability of it's own to me too anyhow, and even if it's none of Lc0's best strenghts, it scores not so bad here, regards

[Paloma]

... I made a new .epd 10 positions smaller out of Dann's suite, removing all the above shown doubtful ones, ...

So you have remove Nr. 4, 27, 29, 63, 67, 109, 122, 126, 130, 135
but you mentioned above first Nr. 63, 67 etc.

But what is wrong with Nr. 4, 27, 29 ?

And Nr. 30 is in ?

[Paloma]

But what is wrong with Nr. 4 ?

[peter]

... I made a new .epd 10 positions smaller out of Dann's suite, removing all the above shown doubtful ones, ...

So you have remove Nr. 4, 27, 29, 63, 67, 109, 122, 126, 130, 135
but you mentioned above first Nr. 63, 67 etc.

But what is wrong with Nr. 4, 27, 29 ?

And Nr. 30 is in ?

I removed all those, of which best move isn't well enough to be discriminated to second best one. E.g. nr.4 (you ask for in extra posting) is 9moves of a Blathy- study cut off.

[pgn][Event "Souhaits de Noel"] [Site "?"] [Date "1925.??.??"] [Round "?"] [White "Blathy=O"] [Black "(+4868.18c1g8)"] [Result "1-0"] [SetUp "1"] [FEN "1r1Nb1kq/ppbR1R2/P7/4ppr1/3np1p1/8/5npp/NQK5 w - - 0 1"] [PlyCount "147"] [EventDate "1925.??.??"] {also Wiener Schachzeitung#584 Wiener Schachzeitung=1 1/1926 .} 1. Rf8+ Kxf8 2. Qb4+ Kg8 3. Qc4+ Kf8 4. Qc5+ Kg8 5. Qd5+ Kf8 6. Rf7+ Kg8 7. Rxc7+ Kf8 8. Rf7+ Kg8 9. Rxb7+ Kf8 10. Rf7+ Kg8 11. Rxa7+ Kf8 12. Rf7+ Kg8 13. Rb7+ Kf8 14. Ne6+ Nxe6 15. Qd6+ Kg8 16. Qxe6+ Kf8 17. Qe7+ Kg8 18. Qxg5+ Kf8 19. Qxf5+ Kg8 20. Qe6+ Kf8 21. Qd6+ Kg8 22. Qd5+ Kf8 23. Qc5+ Kg8 24. Qc4+ Kf8 25. Qb4+ Kg8 26. Qb3+ Kf8 27. Qa3+ Kg8 28. Qa2+ Kf8 29. Qxf2+ Kg8 30. Qa2+ Kf8 31. Qa3+ Kg8 32. Qb3+ Kf8 33. Qb4+ Kg8 34. Qc4+ Kf8 35. Qc5+ Kg8 36. Qd5+ Kf8 37. Qd6+ Kg8 38. Qe6+ Kf8 39. Qf5+ Kg8 40. Qxg4+ Kf8 41. Qf5+ Kg8 42. Qe6+ Kf8 43. Qd6+ Kg8 44. Qd5+ Kf8 45. Qc5+ Kg8 46. Qc4+ Kf8 47. Qb4+ Kg8 48. Qb3+ Kf8 49. Qa3+ Kg8 50. Qa2+ Kf8 51. Qf2+ Kg8 52. Qxg2+ Kf8 53. Qf1+ Kg8 54. Qc4+ Kf8 55. Qc5+ Kg8 56. Qd5+ Kf8 57. Qd6+ Kg8 58. Qe6+ Kf8 59. Qe7+ Kg8 60. Rxb8 h1=Q+ 61. Kb2 Q8h2+ 62. Nc2 Qxc2+ 63. Kxc2 Qh2+ 64. Kb3 Qg3+ 65. Ka2 Qf2+ 66. Rb2 Bf7+ 67. Ka3 Qe3+ 68. Ka4 Qd4+ 69. Rb4 Qa1+ 70. Kb5 Qf1+ 71. Ka5 Qa1+ 72. Kb6 Qg1+ 73. Qc5 Qg6+ 74. Kc7 1-0 [/pgn]

https://www.yacpdb.org/#search/MXIxTmIx ... LzEvMA==/1

9.(1.) Rxb7+ is a clear best move with shortest DTM, but to let the position be run in a suite automatically adjudicated, it's too hard for any engine (even Huntsman) to find correct DTM in reasonable TC (for a 138 position- suite, so at maybe seconds to few minutes/pos.) and if that's not te be expected to be found and evaluated really correctly, every success of "solving" was anyhow more or less pure accident, you see?

Huntsman is able to keep mate- score in output backwarding way to position after 9th move Rxb7+ Kf8:

1r1Nbk1q/pR6/P7/3Qppr1/3np1p1/8/5npp/N1K5 w - - 0 1

Analysis by The Huntsman 1:

10.Tf7+ Kg8 11.Txa7+ Kf8 12.Tf7+ Kg8 13.Tb7+ Kf8 14.Se6+ Sxe6 15.Dd6+ Kg8 16.Dxe6+ Kf8 17.De7+ Kg8 18.Dxg5+ Kf8 19.Dxf5+ Kg8 20.De6+ Kf8 21.Dd6+ Kg8 22.Dd5+ Kf8 23.Dc5+ Kg8 24.Dc4+ Kf8 25.Db4+ Kg8 26.Db3+ Kf8 27.Da3+ Kg8 28.Da2+ Kf8 29.Dxf2+ Kg8 30.Da2+ Kf8 31.Da3+ Kg8 32.Db3+ Kf8 33.Db4+ Kg8 34.Dc4+ Kf8 35.Dc5+ Kg8 36.Dd5+ Kf8 37.Dd6+ Kg8 38.De6+ Kf8 39.Df5+ Kg8 40.Dxg4+ Kf8 41.Df5+ Kg8 42.De6+ Kf8 43.Dd6+ Kg8 44.Dd5+ Kf8 45.Dc5+ Kg8 46.Dc4+ Kf8 47.Db4+ Kg8 48.Db3+ Kf8 49.Da3+ Kg8 50.Da2+ Kf8 51.Df2+ Kg8 52.Dxg2+ Kf8 53.Df1+ Kg8 54.Dc4+ Kf8 55.Dc5+ Kg8 56.Dd5+ Kf8 57.Dd6+ Kg8
+- (#85) Tiefe: 52/95 00:00:06 464MN

DTM is too long, but at least mate is within horizon.
Taking back only two plies more makes output look like this in depth 35 of MultiPV=4:

1r1Nb1kq/pp3R2/P7/3Qppr1/3np1p1/8/5npp/N1K5 w - - 0 1

Analysis by The Huntsman 1:

1. +- (3.55): 9.Tc7+ Kf8 10.Dc5+ Kg8 11.Dc4+ Kf8 12.Tf7+ Kg8 13.Td7+ Kf8 14.Dc5+ Kg8 15.Dd5+ Kf8 16.Se6+ Sxe6 17.Dd6+ Kg8 18.Dxe6+ Kf8 19.De7+ Kg8 20.Dxg5+ Kf8 21.Dxf5+ Kg8 22.De6+ Kf8 23.Dd6+ Kg8 24.Dd5+ Kf8 25.Dc5+ Kg8 26.Dc4+ Kf8 27.Db4+ Kg8 28.Db3+ Kf8 29.Da3+ Kg8 30.Da2+ Kf8 31.Dxf2+ Kg8 32.Da2+ Kf8 33.Da3+ Kg8 34.Db3+ Kf8 35.Db4+ Kg8 36.Dc4+ Kf8 37.Dc5+ Kg8 38.Dd5+ Kf8 39.Dd6+ Kg8 40.De6+ Kf8 41.Df5+ Kg8 42.Dxg4+ Kf8 43.Df5+ Kg8 44.De6+ Kf8
2. +- (2.66): 9.Txb7+ Kf8 10.Tf7+ Kg8 11.Td7+ Kf8 12.Dc5+ Kg8 13.Dc4+ Kf8 14.Tf7+ Kg8 15.Txa7+ Kf8 16.Tf7+ Kg8 17.Tb7+ Kf8 18.Dc5+ Kg8 19.Dd5+ Kf8 20.Se6+ Sxe6 21.Dd6+ Kg8 22.Dxe6+ Kf8 23.De7+ Kg8 24.Dxg5+ Kf8 25.Dxf5+ Kg8 26.De6+ Kf8 27.Dd6+ Kg8 28.Dd5+ Kf8 29.Dc5+ Kg8 30.Dc4+ Kf8 31.Db4+ Kg8 32.Db3+ Kf8 33.Da3+ Kg8 34.Da2+ Kf8 35.Dxf2+ Kg8 36.Da2+ Kf8 37.Da3+ Kg8 38.Db3+ Kf8 39.Db4+ Kg8 40.Dc4+ Kf8 41.Dc5+ Kg8 42.Dd5+ Kf8 43.Dd6+ Kg8 44.De6+ Kf8 45.Df5+ Kg8 46.Dxg4+ Kf8 47.Df5+ Kg8 48.De6+ Kf8 49.Dd6+ Kg8 50.Dd5+ Kf8 51.Dc5+ Kg8 52.Dc4+ Kf8 53.Db4+ Kg8 54.Db3+ Kf8
3. +- (2.43): 9.Td7+ Kf8 10.Tf7+ Kg8 11.Tc7+ Kf8 12.Dc5+ Kg8 13.Dc4+ Kf8 14.Tf7+ Kg8 15.Txb7+ Kf8 16.Tf7+ Kg8 17.Tc7+ Kf8 18.Dc5+ Kg8 19.Dd5+ Kf8 20.Tf7+ Kg8 21.Txa7+ Kf8 22.Tf7+ Kg8 23.Tb7+ Kf8 24.Se6+ Sxe6 25.Dd6+ Kg8 26.Dxe6+ Kf8 27.De7+ Kg8 28.Dxg5+ Kf8 29.Dxf5+ Kg8 30.De6+ Kf8 31.Dd6+ Kg8 32.Dd5+ Kf8 33.Dc5+ Kg8 34.Dc4+ Kf8 35.Db4+ Kg8 36.Db3+ Kf8 37.Da3+ Kg8 38.Da2+ Kf8 39.Dxf2+ Kg8 40.Da2+ Kf8 41.Da3+ Kg8 42.Db3+ Kf8 43.Db4+ Kg8 44.Dc4+ Kf8 45.Dc5+ Kg8 46.Dd5+ Kf8 47.Dd6+ Kg8 48.De6+ Kf8 49.Df5+ Kg8 50.Dxg4+ Kf8 51.Df5+ Kg8 52.De6+ Kf8 53.Dd6+ Kg8 54.Dd5+ Kf8
4. +- (2.23): 9.Te7+ Kf8 10.Tf7+ Kg8 11.Txb7+ Kf8 12.Tf7+ Kg8 13.Txa7+ Kf8 14.Tf7+ Kg8 15.Tb7+ Kf8 16.Se6+ Sxe6 17.Dd6+ Kg8 18.Dxe6+ Kf8 19.De7+ Kg8 20.Dxg5+ Kf8 21.Dxf5+ Kg8 22.De6+ Kf8 23.Dd6+ Kg8 24.Dd5+ Kf8 25.Dc5+ Kg8 26.Dc4+ Kf8 27.Db4+ Kg8 28.Db3+ Kf8 29.Da3+ Kg8 30.Da2+ Kf8 31.Dxf2+ Kg8 32.Da2+ Kf8 33.Da3+ Kg8 34.Db3+ Kf8 35.Db4+ Kg8 36.Dc4+ Kf8 37.Dc5+ Kg8 38.Dd5+ Kf8 39.Dd6+ Kg8 40.De6+ Kf8 41.Df5+ Kg8 42.Dxg4+ Kf8 43.Df5+ Kg8 44.De6+ Kf8 45.Dd6+ Kg8 46.Dd5+ Kf8 47.Dc5+ Kg8 48.Dc4+ Kf8 49.Db4+ Kg8 50.Db3+ Kf8

And the point it this one: e.g. 9.Rc7 (?!) doesn't cost the clear win, after 9...Kf8 10.Rf7+ position with transposition to the one before 9th move (the nr.4-one in suite) is reached agaain and the detour delays mate for just two moves all in all, that isn't enough discrimination between best and second best with such a long way to mate to go still, if not as for exact DTM itself. It's not a dual for a mate in x- problem (study-wise), but for a STC- test position for engines I'd call it a dual yet.

If the engine "sees" the advantage and yet choses not the very best but second best move, that doesn't have best DTM but yet doesn't give away the win, that would be a better performance in STC but to find Rxb7+ with 0.00- eval accidentally.
Guess you know, what I mean. Shorter: the position is simply too hard for a suite of short to moderate TC, for that aim many more moves had to be cut off the way to mate as it's done with several other positions of the suite as well.

Nr.30 isn't really solvable as for DTM in STC neither, but at least the move is to be discriminated to second best one with engine getting the "plan" of it;

4Q3/ppp3p1/8/8/3p4/8/1ppp2K1/br1k3n w - - 0 1

Analysis by The Huntsman 1:

1.Dh5+ Kc1 2.Dg5 Kd1 3.Dg4+ Kc1 4.Df4 c6 5.Dg5 Kd1 6.Dg4+ Kc1 7.Df4 g6 8.Dg5 Kd1 9.Dg4+ Kc1 10.Df4 a6 11.Dg5 Kd1 12.Dg4+ Kc1 13.Df4 a5 14.Dg5 Kd1 15.Dg4+ Kc1 16.Df4 c5 17.Dg5 Kd1 18.Dg4+ Ke1 19.De4+ Kd1 20.Df3+ Kc1 21.Df4 a4 22.Dg5 Kd1 23.Dg4+ Kc1 24.Df4 a3 25.Dg5 Kd1 26.Dg4+ Ke1 27.De4+ Kd1 28.Df3+ Kc1 29.Df4 c4 30.Dg5 Kd1 31.Dg4+ Ke1 32.De4+ Kd1 33.Df3+ Kc1 34.Df4 c3 35.Dg5 Kd1 36.Dg4+ Ke1 37.De4+ Kd1 38.Df3+ Kc1 39.Df4 g5 40.Dxg5 Kd1 41.Dg4+ Ke1 42.De4+ Kd1 43.Df3+ Kc1 44.Df4 Sf2 45.Kxf2 Kd1 46.Dxd4 c1S 47.Dxc3 Sd3+ 48.Ke3 Ke1 49.Dxd2+ Kf1 50.Dxd3+ Kg2 51.Dxb1 b5 52.Dg6+ Kh2
+- (152.65 ++) Tiefe: 81/109 00:03:17 16187MN

that was got after starting with empty hash (32G, 30 threads of 16core Ryzen).
And it's the one of the three positions made out of the Miljanic- study with the least number of moves cut off of the original study and without second best move about as good as best one (alternatives are game changing). See the according posting about those three positions above,
regards

[Dann Corbit]

Thanks to all for these efforts. Believe it or not , I did analyze all of these with multi-pv at long time control with several engines.