62 test positions from last couple of months

[Vinvin]

14 positions posted individually in last months
+ 39 hard positions from the ERET suite (reposted 2 weeks ago)
+ 9 positions from the Chichitza suite (sometimes hard for engines)
the 62 EPD lines are listed at the end of this message.

Results with Stockfish_18111220 on 6*4GHz, 300 Seconds per positions, Syzygy 6 pieces.
4 runs. Timings are in second unit.

Code: Select all

   Solution             1st run           2nd run        3rd run          4th run    #found  avg time
 1) Nf3-g5            Nf3-g5    72     Nf3-g5   48    Nf3-g5     98    Nf3-g5   60      4        69,5
 2) Rd1-d3            Qh4-h6           b2xc3          Rd1-d3    125    b2xc3            1       125,0
 3) Bg5-f6            Nd4-b5           Nd2-f3         Bg5-f6    183    Ra1-c1           1       183,0
 4) Rg2xg7            Rg2xg7    23     Rg2xg7   27    Rg2xg7      7    Rg2xg7   20      4        19,3
 5) Qd1-h5            Bc4-d3           Qd1-h5  188    Qd1-h5     67    Qd1-h5  152      3       135,7
 6) Bg1-d4            Bg1-d4     4     Bg1-d4   14    Bg1-d4      6    Bg1-d4   10      4         8,5
 7) Ng3-h5            Ng3-h5    58     Ng3-h5   41    Ng3-h5    218    Ng3-h5   94      4       102,8
 8) e4-e5             e4-e5     50     e4-e5    86    e4-e5     129    e4-e5    78      4        85,8
 9) Bd3xh7            Bc7xb8           Bc7xb8         Bd3xh7     21    Bc7xb8           1        21,0
10) Rf1-c1            Rf1-c1    84     Rf1-c1   45    Rf1-c1     37    Rf1-c1   67      4        58,3
11) .. Qd3xg3         Qd3-e2           Qd3-e2         Qd3-d7           Qd3-e2           0    -------
12) .. f3xg2, Rd3-d2  Rd3-d2    17     f3xg2    14    Rd3-d2     13    Rd3-d2    3      4        11,8
13) b3-b4             b3-b4    114     Ng3-e2         b3-b4      25    b3-b4    56      3        65,0
14) Na8-c7, Rh5xh6    Rh5xh6     0     Rh5xh6    0    Rh5xh6      0    Rh5xh6    0      4         0,0
15) Nf8-g6            Nf8-g6   288     Nf8-g6  247    Nf8-g6    113    Nf8-g6   66      4       178,5
16) Qb3xd5            Qb3xd5     0     Qb3xd5    0    Qb3xd5      0    Qb3xd5    0      4         0,0
17) Qh3-d3            Qh3-d3    45     Qh3-d3   37    Qh3-d3     10    Qh3-d3   59      4        37,8
18) .. Rb8xb2         Rb8xb2     8     Rb8xb2    5    Rb8xb2      6    Rb8xb2   16      4         8,8
19) .. Qa5-g5         Qa5-g5     2     Qa5-g5    0    Qa5-g5      3    Qa5-g5    1      4         1,5
20) Ne3-f5            Ne3-f5   149     Ne3-f5  136    Nf3xd4           Ne3-f5   54      3       113,0
21) Bd3xh7            Bd3xh7     7     Rc2-c3         Bd3xh7     38    Bd3xh7    3      3        16,0
22) g2-g4             g2-g4     20     g2-g4     3    g2-g4       6    g2-g4    38      4        16,8
23) Nf1-g3            Kb1-c1           Nf1-g3  280    Nf1-g3    211    a2-a4            2       245,5
24) Na3xb5            Na3xb5     3     Na3xb5    1    Na3xb5      2    Na3xb5    7      4         3,3
25) b6-b7             Rf5-f8           b6-b7   217    b6-b7     123    Rf5-f8           2       170,0
26) Nc7-a8            Rc2-f2           Rc2-f2         Rc2-f2           Rc2-f2           0    -------
27) a2-a3             a2-a3      3     a2-a3    19    a2-a3       3    a2-a3    25      4        12,5
28) Rb3-b4            Rb3-b4     0     Rb3-b4   67    Rb3-b4      1    Rb3-b4   18      4        21,5
29) Nf4-d3            h4xg5            Nf4-d3  137    Nf4-d3     63    Nf4-d3  162      3       120,7
30) f2-f4             f2-f4      3     f2-f4     5    f2-f4       1    f2-f4     1      4         2,5
31) .. c4-c3          c4-c3     45     c4-c3    21    c4-c3      41    c4-c3    23      4        32,5
32) d5-d6             Ne2-c3           Ne2-c3         Ne2-c3           d5-d6    39      1        39,0
33) Qe3-d3            Qe3-d3     6     Qe3-d3   62    Qe3-d3     45    Qe3-d3   98      4        52,8
34) .. Qc7-b6         Qc7-b6    14     Qc7-b6   35    Qc7-b6     66    Qc7-b6   36      4        37,8
35) Kf2-e1            Rd5xd4           Rd5xd4         Rd5xd4           Kf2-e1   70      1        70,0
36) f4-f5             Nf2-e4           Nf2-e4         f4-f5       0    Nf2-e4           1         0,0
37) Qd1xe2            Qd1xe2   267     Qd1xe2   11    Re1xe2           Qd1xe2   54      3       110,7
38) .. Qh5-f5         g4xh3            g4xh3          g4xh3            g4xh3            0    -------
39) g5xf6             g5xf6     45     g5xf6    34    g5xf6      33    g5xf6    14      4        31,5
40) Qe2xe8            Qe2xe8    56     Qe2xe8  157    Qe2xe8     45    Qe2xe8   76      4        83,5
41) .. Bg5-c1         Bg5-c1     7     Bg5-c1    5    Bg5-c1      4    Bg5-c1    6      4         5,5
42) Bh6-g7            Bh6-e3           Bh6-g7  206    Bh6-e3           Be2xc4           1       206,0
43) c4-c5             c4-c5      3     c4-c5     9    c4-c5      80    c4-c5    18      4        27,5
44) e7-e8N            e7-e8N     7     e7-e8N   24    e7-e8N     17    e7-e8N    0      4        12,0
45) f3-f4             Ke8-d7           Ke8-d7         Ke8-d7           Ke8-d7           0    -------
46) Nf7-d6            Nf7-h6           Nf7-h6         Nf7-h6           Nf7-h6           0    -------
47) .. Rd6-f6         Rd6-d7           Rd6-f6  184    Rd6-d7           Rd6-f6  235      2       209,5
48) Nf3xg5            Nf3xg5    10     Nf3xg5   18    Nf3xg5     16    Nf3xg5    4      4        12,0
49) Ke5-f6            Ke5-f6    98     Ke5-f6  259    Ke5-f6     55    Ke5-f6   73      4       121,3
50) c4-c5             Bf2-e3           c4-c5   232    c4-c5      55    Kd3-e3           2       143,5
51) Kf1-e2(?)         Re4-e8    10     Re4-e8   12    Re4-e8      5    Re4-f4    0      4         6,8
52) Kb7-c8            a5-a6            a5-a6          a5-a6            a5-a6            0    -------
53) .. Rb8-b5         Rb8-b5    22     Rb8-b5    8    Rb8-b5     32    Rb8-b5    4      4        16,5
54) Nh8-f7            Nh8-f7     0     Nh8-f7    5    Nh8-f7      0    Nh8-f7    1      4         1,5
55) Nb8-c6            Bc1-d2           Nb8-d7         Nh3-f2           Nb8-d7           0    -------
56) g4-g5             g4-g5      0     g4-g5     0    g4-g5       0    g4-g5     0      4         0,0
57) Nh7-f8            e7-e8Q           e7-e8Q         Kd3-c3           e7-e8Q           0    -------
58) Bf4-e3            Bf4-e3     1     Bf4-e3  106    Be4-d3           Bf4-e3   23      3        43,3
59) Bd1-b3            Bd1-b3     0     g6xh7          g6xh7            Bd1-b3    0      2         0,0
60) Nh3-g5            Nh3-g5     0     Nh3-g5    0    Nh3-g5      0    Nh3-g5    0      4         0,0
61) Qa3-h3            Qa3-h3   292     Bb7-c8         Bb7-c8           Bb7-c8           1       292,0
62) Nc6xe7            Nf5-d4           Kd1-d2         Rc1-c3           Nc6xe7    2      1         2,0

Code: Select all

1r3rk1/3bqpp1/p3p2p/n1ppP2N/2nP1P1P/2PQ1N2/P3B1P1/2R2RK1 w - - bm Ng5;
r2q1rk1/p1pn1p2/1p2pPp1/3p2B1/2PP3Q/2b5/PP3P1P/2KR2Nb w - - bm Rd3;
r1b1qk1r/pn3pp1/1p2p3/3pP1Bp/1bPN4/4Q1R1/P2N1PP1/R5K1 w - - bm Bf6; 
6r1/2rp1kpp/2qQp3/p3Pp1P/1pP2P2/1P2KP2/P5R1/6R1 w - - bm Rxg7+ ; c0 Shirov mate in 14
rnbq3r/pppp4/3b1pkp/5p2/2BP4/4P3/PPP2PPP/RN1QK2R w KQ - bm Qh5+;
8/8/5p2/6Q1/8/p1K5/p2pp2p/k5B1 w - - bm Bd4;
2R5/p4pkp/2br1qp1/5P2/3p4/1P2Q1NP/P1P3P1/6K1 w - - bm Nh5+;
1N6/2pp4/3k1P2/p7/1pK1P3/5P1P/3r2N1/8 w - - bm e5+;
1r3rk1/1pB2ppp/2b1p3/3pP3/p4Q2/P2B4/1P3PPP/2R3K1 w - - bm Bxh7+; c0 mate in 12 ;
8/2r3k1/8/1p1p1p2/p2PbPp1/PB4P1/1P1K4/5R2 w - - bm Rc1; c0 fortress;
7k/4PBNp/7P/2p5/2P5/2rq2Pp/1P3P1K/8 b - - bm Qxg3+;
5rk1/6b1/2Bp2p1/1RpP2np/P1P1P2P/3r1p2/1P3BP1/4R1K1 b - - bm fxg2 Rd2; easy ;
1k1r2r1/pb5n/1qpp2pP/1pb1p3/4P3/1PNP1QN1/1PPB4/2K2R1R w - - bm b4; c0 already in hard 2018 ;
Nq3n1k/8/P1p2Npp/2Kp3R/pp6/n3p3/8/4Q3 w - - bm Nc7; c0 Rxh6??
r1n2N1k/2n2K1p/3pp3/5Pp1/b5R1/8/1PPP4/8 w - - bm Ng6; id "ERET 002 - Zugzwang";
r2qk2r/ppp1bppp/2n5/3p1b2/3P1Bn1/1QN1P3/PP3P1P/R3KBNR w KQkq - bm Qxd5; id "ERET 008 - Zentrum";
8/p2p4/r7/1k6/8/pK5Q/P7/b7 w - - bm Qd3; id "ERET 015 - Endspiel";
1r3rk1/6p1/p1pb1qPp/3p4/4nPR1/2N4Q/PPP4P/2K1BR2 b - - bm Rxb2; id "ERET 017 - Koenigsangriff";
r1b1kb1r/1p1n1p2/p3pP1p/q7/3N3p/2N5/P1PQB1PP/1R3R1K b kq - bm Qg5; id "ERET 018 - Entwicklung";
3kB3/5K2/7p/3p4/3pn3/4NN2/8/1b4B1 w - - bm Nf5; id "ERET 019 - Endspiel";
1nrrb1k1/1qn1bppp/pp2p3/3pP3/N2P3P/1P1B1NP1/PBR1QPK1/2R5 w - - bm Bxh7; id "ERET 020 - Laeuferopfer h7";
8/3Pk1p1/1p2P1K1/1P1Bb3/7p/7P/6P1/8 w - - bm g4; id "ERET 027 - Zugzwang";
8/7p/5P1k/1p5P/5p2/2p1p3/P1P1P1P1/1K3Nb1 w - - bm Ng3; id "ERET 032 - Zugzwang";
r3k2r/5ppp/3pbb2/qp1Np3/2BnP3/N7/PP1Q1PPP/R3K2R w KQkq - bm Nxb5; id "ERET 035 - Qualitaetsopfer";
r1k1n2n/8/pP6/5R2/8/1b1B4/4N3/1K5N w - - bm b7; id "ERET 036 - Endspiel";
1k6/bPN2pp1/Pp2p3/p1p5/2pn4/3P4/PPR5/1K6 w - - bm Na8; id "ERET 037 - Zugzwang";
r1b1k2r/pp3ppp/1qn1p3/2bn4/8/6P1/PPN1PPBP/RNBQ1RK1 w kq - bm a3; id "ERET 039 - Entwicklung";
5rk1/p1p1rpb1/q1Pp2p1/3Pp2p/4Pn2/1R4N1/P1BQ1PPP/R5K1 w - - bm Rb4; id "ERET 045 - Initiative";
8/4nk2/1p3p2/1r1p2pp/1P1R1N1P/6P1/3KPP2/8 w - - bm Nd3; id "ERET 046 - Endspiel";
r1b1kq1r/1p1n2bp/p2p2p1/3PppB1/Q1P1N3/8/PP2BPPP/R4RK1 w kq - bm f4; id "ERET 049 - Entwicklung";
2b1r3/5pkp/6p1/4P3/QppqPP2/5RPP/6BK/8 b - - bm c3; id "ERET 054 - Endspiel";
r2qr1k1/pp1bbp2/n5p1/2pPp2p/8/P2PP1PP/1P2N1BK/R1BQ1R2 w - - bm d6; id "ERET 057 - Abtausch";
rq6/5k2/p3pP1p/3p2p1/6PP/1PB1Q3/2P5/1K6 w - - bm Qd3; id "ERET 059 - Endspiel";
1r3rk1/2qbppbp/3p1np1/nP1P2B1/2p2P2/2N1P2P/1P1NB1P1/R2Q1RK1 b - - bm Qb6; id "ERET 065 - Zwischenzug";
8/2pN1k2/p4p1p/Pn1R4/3b4/6Pp/1P3K1P/8 w - - bm Ke1; id "ERET 066 - Endspiel";
1r4k1/1nq3pp/pp1pp1r1/8/PPP2P2/6P1/5N1P/2RQR1K1 w - - bm f5; id "ERET 071 - Ablenkung";
r4rk1/ppp2ppp/1nnb4/8/1P1P3q/PBN1B2P/4bPP1/R2QR1K1 w - - bm Qxe2; id "ERET 073 - Mobilitaet";
6r1/6r1/2p1k1pp/p1pbP2q/Pp1p1PpP/1P1P2NR/1KPQ3R/8 b - - bm Qf5; id "ERET 075 - Festung";
r3r1k1/1bq2ppp/p1p2n2/3ppPP1/4P3/1PbB4/PBP1Q2P/R4R1K w - - bm gxf6; id "ERET 077 - Rochadeangriff";
r1bqr1k1/3n1ppp/p2p1b2/3N1PP1/1p1B1P2/1P6/1PP1Q2P/2KR2R1 w - - bm Qxe8; id "ERET 079 - Damenopfer";
5rk1/1ppbq1pp/3p3r/pP1PppbB/2P5/P1BP4/5PPP/3QRRK1 b - - bm Bc1; id "ERET 080 - Raeumung";
4r1k1/1r1np3/1pqp1ppB/p7/2b1P1PQ/2P2P2/P3B2R/3R2K1 w - - bm Bg7; id "ERET 084 - Koenigsangriff";
r3k2r/pp2pp1p/8/q2Pb3/2P5/4p3/B1Q2PPP/2R2RK1 w kq - bm c5; id "ERET 086 - Qualitaetsopfer";
8/2P1P3/b1B2p2/1pPRp3/2k3P1/P4pK1/nP3p1p/N7 w - - bm e8N; id "ERET 089 - Unterverwandlung";           
4K1k1/8/1p5p/1Pp3b1/8/1P3P2/P1B2P2/8 w - - bm f4; id "ERET 090 - Endspiel";
2b1r3/r2ppN2/8/1p1p1k2/pP1P4/2P3R1/PP3PP1/2K5 w - - bm Nd6; id "ERET 093 - Endspiel";
2k2Br1/p6b/Pq1r4/1p2p1b1/1Ppp2p1/Q1P3N1/5RPP/R3N1K1 b - - bm Rf6; id "ERET 094 - Damenopfer";
r2qk2r/ppp1b1pp/2n1p3/3pP1n1/3P2b1/2PB1NN1/PP4PP/R1BQK2R w KQkq - bm Nxg5; id "ERET 095 - Damenopfer";
8/8/4p1Pk/1rp1K1p1/4P1P1/1nP2Q2/p2b1P2/8 w - - bm Kf6; id "ERET 096 - Endspiel";
2k5/p7/Pp1p1b2/1P1P1p2/2P2P1p/3K3P/5B2/8 w - - bm c5; id "ERET 097 - Endspiel";
8/6pp/5k2/1p1r4/4R3/7P/5PP1/5K2 w - - am Ke2; id "ERET 098 - Endspiel";
4k1br/1K1p1n1r/2p2pN1/P2p1N2/2P3pP/5B2/P2P4/8 w - - bm Kc8; id "ERET 103 - Zugzwang";
1r1r2k1/2pq3p/4p3/2Q1Pp2/1PNn1R2/P5P1/5P1P/4R2K b - - bm Rb5; id "ERET 107 - Verteidigung";
2k4N/Q1np4/2p2Bpp/1p1P4/pPP1p2P/P7/7q/1K6 w - - bm Nf7; 
1N4K1/1pp1p3/7k/2r3pP/p2pp1P1/P6N/8/2B5 w - - bm Nc6; 
4B3/k1K1pp2/p3bq2/2p1p3/1p2P1P1/4P2Q/nR6/8 w - - bm g5; 
8/4Pr1N/8/6PN/8/3K1ppp/4prkb/4Bbnn w - - bm Nf8;
8/q1p1N1p1/3p1p1p/pk5P/1p2BB2/8/PK3P2/8 w - - bm Be3; 
6kq/2p4p/6P1/5nN1/K7/2P5/7B/3B4 w - - bm Bb3+;
5k2/2p4p/6P1/1p3n2/3q4/PB4BN/KP5P/8 w - - bm Ng5;
8/1B3b1p/7P/p2p4/P2pp1kp/Q7/1N1Pq2P/7K w - - bm Qh3;
6k1/1qr1p2p/ppN5/3p1N2/6p1/1P1P2Pp/PP2PP1P/2RK4 w - - bm Ncxe7+;

[peter]

Hi Vincent!

11) .. Qd3xg3 Qd3-e2 Qd3-e2 Qd3-d7 Qd3-e2 0 -------
[/code]

Code: Select all

7k/4PBNp/7P/2p5/2P5/2rq2Pp/1P3P1K/8 b - - bm Qxg3+;

Thanks for the nice collection.
From the ones, I didn't know already, I like nr. 11 most.
Sting seems to be a class of its own here once again.
And I'm sure, I remember that position with the desperado- Rook or a very similar one, but it's not in my database, where it should be.
Is the position different a little bit since last time posted? When was it here lately and where is it from?

[Vinvin]

Hi Vincent!

11) .. Qd3xg3 Qd3-e2 Qd3-e2 Qd3-d7 Qd3-e2 0 -------
[/code]

Code: Select all

7k/4PBNp/7P/2p5/2P5/2rq2Pp/1P3P1K/8 b - - bm Qxg3+;

Thanks for the nice collection.
From the ones, I didn't know already, I like nr. 11 most.
Sting seems to be a class of its own here once again.
And I'm sure, I remember that position with the desperado- Rook or a very similar one, but it's not in my database, where it should be.
Is the position different a little bit since last time posted? When was it here lately and where is it from?

Position is from here : viewtopic.php?p=769949#p769949
Note if you type the string "7k/4PBNp/7P/2p5/2P5/2rq2Pp/1P3P1K/8" in the search, it will find it.

Thanks for your interest,
Vincent

[peter]

Position is from here : viewtopic.php?p=769949#p769949
Note if you type the string "7k/4PBNp/7P/2p5/2P5/2rq2Pp/1P3P1K/8" in the search, it will find it.

I knew that I knew it, it's from Mihai Neghina's "Chase", shame on me!
But cutting off the first move, so that the white Bishop's gone, displacing the white Knight, changing side to move and so making draw out of white win (deriving from a side- line of the study with wrong white move) was too much for my poor old capacity for remembering.

And thanks for the hint for searching for fens, had tried string including move number, that doesn't work.

[Dann Corbit]

The really difficult problem from this set of 62 is this one:
Nq3n1k/8/P1p2Npp/2Kp3R/pp6/n3p3/8/4Q3 w - - acd 59; acs 620; bm Nc7; c0 "Rxh6+ is bad (leads to a draw) while Nc7 wins"; c3 "Nc7"; c6 Arves.15772; ce 32712; dm 28; pm Nc7; pv Nc7 Qd8 Rxh6+ Kg7 a7 Nc4 Nfe8+ Kxh6 a8=Q Nd7+ Kxc6 Nde5+ Kb7 Qxa8+ Kxa8 Kg5 Nxd5 Kf5 Nxe3+ Nxe3 Qxe3 a3 Ng7+ Kf6 Qf4+ Kxg7 Qxe5+ Kh7 Kb7 a2 Qh2+ Kg7 Qxa2 Kf6 Qb2+ Kf5 Kc6 Ke4 Qxb4+ Kd3 Kd5 Ke3 Qe4+ Kf2 Qg4 Ke3 Kc4 Kd2 Qf3 Kc1 Qc3+ Kd1 Kd3 g5 Qa1#;

I think that it is a mate in 28 and not a mate in 17 like the original problem states, because black's best response after Nc7 is Qd8 and not gxh5 as suggested in the original problem. From Arves, the original problem is stated as follows:
[pgn] [Event "1.hm e4 e5 10 JT"] [Site ""] [Date "2017"] [Round ""] [White "Peter S. Krug & Mario García"] [Black "No.139"] [Result "1-0"] [EventDate "2017"] [SetUp "1"] [FEN "Nq3n1k/8/P1p2Npp/2Kp3R/pp6/n3p3/8/4Q3 w - - 0 1"] [PlyCount "33"] [SourceDate "2017.11.29"] 1. Nc7 $1 (1. Rxh6+ $2 Kg7 2. Nc7 Kxf6 3. Kxc6 Nc4 $11) 1... gxh5 (1... Ne6+ 2. Nxe6 Qa7+ 3. Kxc6 Qxa6+ 4. Kd7 $18) 2. Qg3 $1 (2. Qg1 $2 Nd7+ 3. Nxd7 Qxc7 $11) 2... Ne6+ 3. Nxe6 Qxg3 (3... Qb5+ 4. Kd6 $18) 4. a7 Qd6+ $1 5. Kxd6 Nb5+ 6. Ke7 Nxa7 7. Kf8 $1 (7. Kf7 $2 Nc8 8. Nf4 Ne7 9. Kxe7 Kg7 10. N6xh5+ Kg8 $11) (7. Nf4 $2 Kg7 8. Ne8+ Kg8 $11) 7... Nc8 8. Nf4 Ne7 9. Nd3 Ng6+ (9... e2 10. Ne5 e1=Q 11. Nf7#) 10. Kf7 e2 11. Kxg6 e1=Q 12. Nxe1 b3 13. Nd3 b2 14. Nxb2 a3 15. Nd3 a2 16. Ne5 a1=Q 17. Nf7# 1-0 [/pgn]

My best analysis for this game (in reverse order) is as follows:

Code: Select all

7k/8/2p2NKp/3pN2p/8/8/8/q7 w - - ce 32766; dm 1; bm Nf7+; 
7k/8/2p2NKp/3pN2p/8/8/p7/8 b - - ce -32765; dm -1; bm d4; 
7k/8/2p2NKp/3p3p/8/3N4/p7/8 w - - ce 32764; dm 2; bm Ne5; 
7k/8/2p2NKp/3p3p/8/p2N4/8/8 b - - ce -32763; dm -2; bm h4; 
7k/8/2p2NKp/3p3p/8/p7/1N6/8 w - - ce 32762; dm 3; bm Nd3; 
7k/8/2p2NKp/3p3p/p7/8/1N6/8 b - - ce -32761; dm -3; bm h4; 
7k/8/2p2NKp/3p3p/p7/3N4/1p6/8 w - - ce 32760; dm 4; bm Nxb2; 
7k/8/2p2NKp/3p3p/p7/1p1N4/8/8 b - - ce -32759; dm -4; bm b2; 
7k/8/2p2NKp/3p3p/p7/1p6/8/4N3 w - - ce 32758; dm 5; bm Nd3; 
7k/8/2p2NKp/3p3p/pp6/8/8/4N3 b - - ce -32757; dm -5; bm b3; 
7k/8/2p2NKp/3p3p/pp6/3N4/8/4q3 w - - ce 32756; dm 6; bm Nxe1; 
7k/8/2p2NKp/3p3p/pp6/3N4/4p3/8 b - - ce -32755; dm -6; bm e1=R; 
7k/5K2/2p2Nnp/3p3p/pp6/3N4/4p3/8 w - - ce 32754; dm 7; bm Kxg6; 
7k/5K2/2p2Nnp/3p3p/pp6/3Np3/8/8 b - - ce -32753; dm -7; bm b3; 
5K1k/8/2p2Nnp/3p3p/pp6/3Np3/8/8 w - - ce 32752; dm 8; bm Kf7; 
5K1k/4n3/2p2N1p/3p3p/pp6/3Np3/8/8 b - - ce -32751; dm -8; bm Ng6+; 
5K1k/4n3/2p2N1p/3p3p/pp3N2/4p3/8/8 w - - ce 32750; dm 9; bm Nd3; 
2n2K1k/8/2p2N1p/3p3p/pp3N2/4p3/8/8 b - - ce -32749; dm -9; bm Ne7; 
2n2K1k/8/2p1NN1p/3p3p/pp6/4p3/8/8 w - - ce 32748; dm 10; bm Nf4; 
5K1k/n7/2p1NN1p/3p3p/pp6/4p3/8/8 b - - ce -32747; dm -10; bm Nc8; 
7k/n3K3/2p1NN1p/3p3p/pp6/4p3/8/8 w - - ce 32746; dm 11; bm Kf8; 
7k/P3K3/2p1NN1p/1n1p3p/pp6/4p3/8/8 b - - ce -32745; dm -11; bm Nxa7; 
7k/P7/2pKNN1p/1n1p3p/pp6/4p3/8/8 w - - ce 32744; dm 12; bm Ke7; 
7k/P7/2pKNN1p/3p3p/pp6/n3p3/8/8 b - - ce -32743; dm -12; bm Nb5+; 
7k/P7/2pqNN1p/2Kp3p/pp6/n3p3/8/8 w - - ce 32742; dm 13; bm Kxd6; 
7k/P7/2p1NN1p/2Kp3p/pp6/n3p1q1/8/8 b - - ce -32741; dm -13; bm Qg8; 
7k/8/P1p1NN1p/2Kp3p/pp6/n3p1q1/8/8 w - - ce 32740; dm 14; bm a7; 
1q5k/8/P1p1NN1p/2Kp3p/pp6/n3p1Q1/8/8 b - - ce -32739; dm -14; bm Qxg3; 
1q5k/2N5/P1p1nN1p/2Kp3p/pp6/n3p1Q1/8/8 w - - ce 32738; dm 15; bm Nxe6; 
1q3n1k/2N5/P1p2N1p/2Kp3p/pp6/n3p1Q1/8/8 b - - ce -32737; dm -15; bm Ne6+; 
1q3n1k/2N5/P1p2N1p/2Kp3p/pp6/n3p3/8/4Q3 w - - ce 32736; dm 16; bm Qg3; 
1q3n1k/2N5/P1p2Npp/2Kp3R/pp6/n3p3/8/4Q3 b - - ce -32711; dm -28; bm Qd8; 
Nq3n1k/8/P1p2Npp/2Kp3R/pp6/n3p3/8/4Q3 w - - ce 32710; dm 29; bm Nc7; 

[Dann Corbit]

Test suite with full analysis:

Code: Select all

1k1r2r1/pb5n/1qpp2pP/1pb1p3/4P3/1PNP1QN1/1PPB4/2K2R1R w - - acd 47; acs 1800; bm b4; c0 "already in hard 2018"; c1 "Hard"; c3 "b4"; ce 189; id "hard2018.26"; pm b4; pv b4 Bxb4; 
1k6/bPN2pp1/Pp2p3/p1p5/2pn4/3P4/PPR5/1K6 w - - acd 53; acs 10196; bm Na8; c0 "Garcia 2000"; c2 "Garcia 2000"; c3 "Na8"; c5 "ERET.037 - Zugzwang"; ce 9780; id "ERET 037 - Zugzwang"; pm Na8; pv Na8 Nxc2; 
1N4K1/1pp1p3/7k/2r3pP/p2pp1P1/P6N/8/2B5 w - - acd 47; acs 8760; bm Nc6; c0 "http://www.chessvideos.tv/forum/viewtopic.php?t=10770"; c3 "Nc6"; c5 "09 Standstill == http://chichitza.ro/Chess.html?lang=en&aux=09"; ce 0; id "09 Standstill   =="; pm Nc6; pv Nc6 bxc6 Nxg5 Rxg5+ Kh8 e3 Bxe3 d3 Bf4 c5 Bc1 e5 Bf4 c4 Bc1 c3 Be3 e4 Bd2 cxd2; 
1N6/2pp4/3k1P2/p7/1pK1P3/5P1P/3r2N1/8 w - - acd 43; acs 3403; bm e5+; c3 "e5+"; c6 Arves.00412; ce 1929; pm e5+; pv e5+ Ke6 Nf4+ Kxe5 f7 Kxf4 f8=Q+ Kg3 Qf5 d5+ Kb5 Kf2 Qg5 Rd1 Nc6 b3 Qe5 Rb1 Nxa5 b2 Qxd5 Kg1 Qa2 Rd1 Qxb2 Rd5+ Ka4 Rd7 Nc6 Rd6 Qc2 Kf1 Qc1+ Kg2 Qg5+ Kh1 Qc5 Rd1 Ne5 Ra1+ Kb4 Rb1+ Ka3 Ra1+ Kb2 Rd1 Qc2 Rd5 Qc6 Rd1 Qxc7 Rd5 Ka3 Rd1 Kb4; 
1nrrb1k1/1qn1bppp/pp2p3/3pP3/N2P3P/1P1B1NP1/PBR1QPK1/2R5 w - - acd 44; acs 1844; bm Bxh7+; c2 "Burmakin-Ziatdinov, Moskau 2009"; c3 "Bxh7+"; c5 "ERET.020 - Laeuferopfer h7"; ce 249; id "ERET 020 - Laeuferopfer h7"; pm Bxh7+; pv Bxh7+ Kxh7 Ng5+ Kh6 Rc3 f5 exf6 Bxf6 Qc2 Bg6 Rxc7 Qxc7 Qxc7 Rxc7 Rxc7 Bxg5 hxg5+ Kxg5 Nxb6 Bd3 Rxg7+ Kf6 Rb7 Bb5 Ba3 Rg8 f3 Bc6 Rc7 Rg7 Rc8 Rb7 Bc5 Bb5 a4 Bc6 g4 a5 f4 Kg6 Kg3 Kf6 Kf2 Kg6 Ke3 Kf6 Kf2; 
1r1r2k1/2pq3p/4p3/2Q1Pp2/1PNn1R2/P5P1/5P1P/4R2K b - - acd 46; acs 3598; bm Rb5; c3 "Rb5"; c5 "ERET.107 - Verteidigung"; ce -51; id "ERET 107 - Verteidigung"; pm Rb5; pv Rb5 Rxd4 Qxd4 Qxb5 Qxf2 Rc1 Qf3+ Kg1 Rd1+ Rxd1 Qxd1+ Kf2 Qc2+ Ke3 Qe4+ Kd2 Qg2+ Kc3 Qf3+ Ne3 Qxe3+ Qd3 Qxe5+ Kc4 Kf8 a4 Ke7 a5 c6 a6 Qb5+ Kc3 Qa4 Kd2 Qa2+ Ke1 Qa1+ Kf2 Qb2+ Kf1 Qa1+ Ke2 Qb2+ Kf3 Qxb4 a7 Qa4 Qe3 Kf7 Qb6 Qd1+ Kg2 Qd5+ Kh3 Qc4 Qb7+ Kg6 Qb2 Qf1+ Qg2 Qa6 Qf2 Qa4 Kg2 Kf7 h3 h5 Qc5 e5 Qxe5 Qxa7 Qxf5+ Kg8 Qg6+ Kf8 Qd6+ Kg7; 
1r3rk1/1pB2ppp/2b1p3/3pP3/p4Q2/P2B4/1P3PPP/2R3K1 w - - acd 25; acs 44; bm Bxh7+; c0 "mate in 12"; c3 "Bxh7+"; ce 32744; dm 12; pm Bxh7+; pv Bxh7+ Kxh7 Qh4+ Kg8 Rc3 f6 Bxb8 Bd7 Rg3 Rc8 Qh6 Rc1+ Qxc1 Kf7 exf6 gxf6 Qh6 Ke7 Qh7+ Kd8 Rg8+ Be8 Qc7+; 
1r3rk1/2qbppbp/3p1np1/nP1P2B1/2p2P2/2N1P2P/1P1NB1P1/R2Q1RK1 b - - acd 41; acs 600; bm Qb6; c3 "Qb6"; c5 "ERET.065 - Zwischenzug"; ce -113; id "ERET 065 - Zwischenzug"; pm Qb6; pv Qb6 Kh2 Bxb5 e4 Ra8 Kh1 Rfd8 Ra2 Qb7 Qe1 Be8 Qf2 Nb3 Rxa8 Rxa8 Nxc4 Rc8 e5 dxe5 Bxf6 Bxf6 fxe5 Bg7 d6 Nc5 dxe7 Qxe7 Nd6 Rc6; 
1r3rk1/3bqpp1/p3p2p/n1ppP2N/2nP1P1P/2PQ1N2/P3B1P1/2R2RK1 w - - acd 41; acs 1799; am dxc5; bm Ng5; c0 "http://talkchess.com/forum3/viewtopic.php?f=2&t=68310"; c3 "Ng5"; ce 455; id "StunFun.00"; pm Ng5; pv Ng5; 
1r3rk1/6p1/p1pb1qPp/3p4/4nPR1/2N4Q/PPP4P/2K1BR2 b - - acd 39; acs 446; bm Rxb2; c0 "level: hard-16"; c3 "Rxb2"; c4 "Rb8xPb2 (got a !? but game-theor optimal) (Krogius_EofCM) #1229 black_wins"; c5 "ERET.017 - Koenigsangriff"; ce 70; id "ERET 017 - Koenigsangriff"; pm Rxb2; pv Rxb2 Nxe4 dxe4 Bc3 Ba3 Bxf6 Rb3+ Bb2 Bxb2+ Kb1 Rxh3 Kxb2 Rxh2 Re1 Re8 f5 e3 Ra4 Rf2 Rxa6 Rxf5 Rxc6 Kf8 Kc3 e2 Rd6 Rfe5 Rd4 Ke7 Rf4 Rd8 Rf2 Re3+ Kb2 h5 Kc1 Re4 Rfxe2 Rxe2 Rxe2+ Kf6 Rh2 Kxg6 Kb2 Rh8 a4 Kf5 a5 g5 a6 h4 a7 Ra8 Rf2+ Ke4; 
1r4k1/1nq3pp/pp1pp1r1/8/PPP2P2/6P1/5N1P/2RQR1K1 w - - acd 37; acs 173; bm f5; c3 "f5"; c5 "ERET.071 - Ablenkung"; ce 192; id "ERET 071 - Ablenkung"; pm f5; pv f5; 
2b1r3/5pkp/6p1/4P3/QppqPP2/5RPP/6BK/8 b - - acd 44; acs 146; bm c3; c0 "Jussupow-Kasparov, Linares 1990"; c3 "c3"; c5 "ERET.054 - Endspiel"; ce 592; id "ERET 054 - Endspiel"; pm c3; pv c3; 
2b1r3/r2ppN2/8/1p1p1k2/pP1P4/2P3R1/PP3PP1/2K5 w - - acd 57; acs 3479; bm Nd6+; c0 "Rf3+, Nh6+ and Nd6+ probably all draw, but Nd6+ is the most clear and obvious"; c1 "Hard"; c3 "Nd6+"; c4 "The following pv has a score of -451 at a depth of 49:	Nd6+ exd6 Rf3+ Ke6 Re3+ Kf7 Rf3+ Ke7 Re3+ Kd8 Rxe8+ Kxe8 a3 Bb7 Kd1 Ra8 Ke2 Kf7 Kf1 Rg8 f3 Kf6 Kf2 Kf5 g3 Ra8 Kg2 Rh8 Kg1 Kf6 Kg2 Kg5 Kg1"; c5 "The following pv has a score of 0 at a depth of 57: Nh6+ Kf6 Ng4+ Ke6 Re3+ Kf5 Rg3 d6 Ne3+ Ke6 Rh3 Rf8 f3 Bb7 Rh1 Raa8 Re1 Rh8 Kc2 Kf7 a3 Rag8 Rf1 Rh4 Kd1 e6 Ke2 Bc6 Ng4 Be8 Rg1 Bd7 Rd1 Rh5 Ne3 Rgh8 Kf2 Rh4 Rd2 Bc6 Ng4 Rh1 Ke3 Rg8 Re2 Bd7 Kd2 Rh7 Ne3 Rh4 Kd3 Rh1 Kd2 Bc6 Ng4 Rh4 Kd3 Ke7 Rd2 Be8 Ne3 Rh1 Ke2 Rgh8 Kf2 Bg6"; ce 0; id "ERET 093 - Endspiel"; pm Nd6+; pv Nd6+ exd6 Rf3+ Ke6 Re3+ Kf7 Rf3+ Ke7 Re3+ Kd8 Rxe8+ Kxe8 a3 Rc7 Kd2 Bb7 Ke3 Rc4 f3 Rc8; 
2k2Br1/p6b/Pq1r4/1p2p1b1/1Ppp2p1/Q1P3N1/5RPP/R3N1K1 b - - acd 50; acs 3327; bm Rf6; c0 "http://immortalchess.net/forum/archive/index.php/t-17360.html"; c1 "Hard"; c3 "Rf6"; c5 "ERET.094 - Damenopfer"; ce 705; id "ERET 094 - Damenopfer"; pm Rf6; pv Rf6 Bc5 Be3 Raa2 Rxf2 Rxf2 Bxf2+ Kxf2 Qh6 Qa2 Qe3+ Kf1 Rg6 Ne4 Qxe4 Qf2 Qf4 Bxd4 Rxa6 Be3 Qxf2+ Bxf2 Bd3+ Kg1 Ra3 Bg3 Rxc3 Bxe5 Rb3 Bd6 Bh7 Kf2 c3 Ke3 c2+ Kd2 Rb1 Nxc2 Rb2 Ke3 Rxc2 g3 Bf5 Kf4 Bd7 Kg5 Rxh2 Bc5 Kb7 Bf8 Re2 Bg7 Re4 Bf8 Kc6 Kh4 Re2 Bg7 Rh2+ Kg5 Rg2 Be5 Rc2 Bf6 Kb7 Be7 Re2 Bf8 Rd2 Bg7; 
2k4N/Q1np4/2p2Bpp/1p1P4/pPP1p2P/P7/7q/1K6 w - - acd 62; acs 12360; bm Nf7; c2 "1"; c3 "Nf7"; c5 "06 Guard Change +- http://chichitza.ro/Chess.html?lang=en&aux=06"; c6 Arves.02237; ce 200; id "06 Guard Change +-"; pm Nf7; pv Nf7 Qg3 Qxc7+ Qxc7 d6 Qb8 c5 Kb7 Nd8+ Ka6 Kc2 Qc8 Kd2 Qb8 Ke3 Qc8 Kxe4 Qb8 Be7 Qc8 Ke5 Qa8 Kf6 g5 hxg5 hxg5 Kxg5 Qc8 Kf6 Ka7 Kf7 Ka8 Ke8 Ka7 Bf8 Ka8 Ke7 Ka7 Ne6 Ka8 Nd4 Ka7 Nf3 Ka8 Ne5 Ka7 Nxd7 Qb7 Bg7 Ka6 Bf6 Ka7 Ke8 Qc8+ Bd8 Kb7 Nf6; 
2k5/p7/Pp1p1b2/1P1P1p2/2P2P1p/3K3P/5B2/8 w - - acd 80; acs 1757; bm c5; c0 "level: hard-16"; c1 "Hard"; c3 "c5"; c5 "ERET.097 - Endspiel"; ce 193; id "ERET 097 - Endspiel"; pm c5; pv c5; 
2R5/p4pkp/2br1qp1/5P2/3p4/1P2Q1NP/P1P3P1/6K1 w - - acd 25; acs 41; bm Nh5+; c0 "http://talkchess.com/forum3/viewtopic.php?f=2&t=68033"; c3 "Nh5+"; ce 32744; dm 12; id "TI-e.130"; pm Nh5+; pv Nh5+ gxh5 Qg3+ Qg6 fxg6 Rxg6 Qe5+ Kh6 Rc7 Bd5 Qxd5 Rf6 Rc5 Kg7 Qe5 h6 Rc6 Kf8 Qxf6 Ke8 Rc7 Kf8 Qxf7+; 
3kB3/5K2/7p/3p4/3pn3/4NN2/8/1b4B1 w - - acd 42; acs 300; bm Nf5; c3 "Nf5"; c5 "ERET.019 - Endspiel"; ce 928; id "ERET 019 - Endspiel"; pm Nf5; pv Nf5 Ng5+ Nxg5 Bxf5 Nf3 Bg4 Nxd4 Bh5+ Kf8 Bg4; 
4B3/k1K1pp2/p3bq2/2p1p3/1p2P1P1/4P2Q/nR6/8 w - - acd 53; acs 4122; bm g5; c3 "g5"; c5 "10 Shelter == http://chichitza.ro/Chess.html?lang=en&aux=10"; ce 0; id "10 Shelter      =="; pm g5; pv g5 Qxg5 Qxe6 fxe6 Rxa2 Qg8 Ra4 Qxe8 Rxa6+ Kxa6; 
4k1br/1K1p1n1r/2p2pN1/P2p1N2/2P3pP/5B2/P2P4/8 w - - acd 29; acs 60; bm Kc8; c1 "Hard"; c3 "Kc8"; c5 "ERET.103 - Zugzwang"; ce 32740; dm 14; id "ERET 103 - Zugzwang"; pm Kc8; pv Kc8 gxf3 a6 f2 a7 f1=Q a8=N Qf4 Nc7+ Qxc7+ Kxc7 dxc4 Kc8 d5 a4 c3 dxc3 c5 a5 d4 a6 dxc3 a7 c2 a8=Q c1=Q Qc6+; 
4K1k1/8/1p5p/1Pp3b1/8/1P3P2/P1B2P2/8 w - - acd 76; acs 6342; bm f4; c0 "Šachová skladba 2011-12, 1st Prize"; c1 "Hard"; c3 "f4"; c4 "arasan19.189"; c5 "ERET.090 - Endspiel"; c6 Arves.04139; ce 695; id "ERET 090 - Endspiel"; pm f4; pv f4; 
4r1k1/1r1np3/1pqp1ppB/p7/2b1P1PQ/2P2P2/P3B2R/3R2K1 w - - acd 45; acs 3446; bm Bg7; c3 "Bg7"; c5 "ERET.084 - Koenigsangriff"; ce 166; id "ERET 084 - Koenigsangriff"; pm Bg7; pv Bg7; 
5k2/2p4p/6P1/1p3n2/3q4/PB4BN/KP5P/8 w - - acd 73; acs 8760; bm Ng5; c3 "Ng5"; c5 "* Smothering II +- http://chichitza.ro/Chess.html?lang=en&aux=16"; ce 432; id "* Smothering II +-"; pm Ng5; pv Ng5; 
5rk1/1ppbq1pp/3p3r/pP1PppbB/2P5/P1BP4/5PPP/3QRRK1 b - - acd 36; acs 175; bm Bc1; c3 "Bc1"; c5 "ERET.080 - Raeumung"; ce 66; id "ERET 080 - Raeumung"; pm Bc1; pv Bc1 f4; 
5rk1/6b1/2Bp2p1/1RpP2np/P1P1P2P/3r1p2/1P3BP1/4R1K1 b - - acd 37; acs 121; bm Rd2; c0 "easy"; c3 "fxg2 Rd2"; ce 525; pm Rd2; pv Rd2 hxg5 fxg2 Be3 Rc2 Ra5 Rf3 Ra8+ Kh7 Ra7 Rh3 Bf2 Rh1+ Kxg2 Rxe1 Rf7 Rxb2 a5 Ra2 a6 Kg8 a7 Kxf7 a8=Q Rxa8 Bxe1 Ra2+ Kf1 Be5 Bf2 Ke7 Bb5 Ra3 Kg2 Bd4 Bg3 Re3 Bf4 Rxe4 Kf3 Re1 Bd2 Rf1+ Ke2 Rg1 Kf3; 
5rk1/p1p1rpb1/q1Pp2p1/3Pp2p/4Pn2/1R4N1/P1BQ1PPP/R5K1 w - - acd 40; acs 157; bm Rb4; c3 "Rb4"; c5 "ERET.045 - Initiative"; ce 89; id "ERET 045 - Initiative"; pm Rb4; pv Rb4; 
6k1/1qr1p2p/ppN5/3p1N2/6p1/1P1P2Pp/PP2PP1P/2RK4 w - - acd 56; acs 14400; bm Ncxe7+; c3 "Ncxe7+"; c5 "18 Stronghold == http://chichitza.ro/Chess.html?lang=en&aux=18"; c6 Arves.06774; ce -776; id "18 Stronghold =="; pm Ncxe7+; pv Ncxe7+ Kf8 Rxc7 Qxc7 e3 Qe5 Ng6+ hxg6 Nd4 Kf7 a3 Qc7 Kd2 Kf6 Kd1 b5 Kd2 Qe7 Ke2 Qc5 Kd1 Ke5 Kd2 Qf8 Ke2 Qf7 Ke1 Kf6 Kd1 Ke7 Ke2 Kf8 Ke1 Ke8 Ke2 Ke7 Kf1 Kf6 Ke1 Qd7 Kd2 Qc7 Kd1 Ke5 Kd2 b4 a4 Kd6 Kd1 Kd7 Kd2 Qc8 Kd1 Ke7 Kd2 Qf8 Ke1 Kd6 Ke2 Qf7 Ke1 Kc5; 
6kq/2p4p/6P1/5nN1/K7/2P5/7B/3B4 w - - acd 63; acs 8760; bm Bb3+; c3 "Bb3+"; c5 "16 Smothering +- http://chichitza.ro/Chess.html?lang=en&aux=16"; c6 Arves.07031; ce 1814; id "16 Smothering +-"; pm Bb3+; pv Bb3+; 
6r1/2rp1kpp/2qQp3/p3Pp1P/1pP2P2/1P2KP2/P5R1/6R1 w - - acd 29; acs 31; bm Rxg7+; c0 "Shirov mate in 14"; c1 "Shirov mate in 14"; c2 "#15; 00:00 @ C0/R2/K4/P5/X23;"; c3 "Rxg7+"; ce 32740; dm 14; id "ChestDB.6147"; pm Rxg7+; pv Rxg7+ Rxg7 Rxg7+ Kxg7 Qe7+ Kg8 Qe8+ Kg7 h6+ Kxh6 Qf8+ Kh5 Qf7+ Kh4 Qxh7+ Kg3 Qg6+ Kh3 Kf2 Qc5+ Kf1 Qg1+ Qxg1 d5 Qg2+ Kh4 Qh2+; 
6r1/6r1/2p1k1pp/p1pbP2q/Pp1p1PpP/1P1P2NR/1KPQ3R/8 b - - acd 64; acs 2890; bm Qf5; c0 "id deep.09 fortress"; c1 "Hard"; c3 "Qf5"; c5 "ERET.075 - Festung"; ce 0; id "ERET 075 - Festung"; pm Qf5; pv Qf5 Nxf5 gxf5 Rg3 h5 Re2 Re7 Re1 Rf7 Qf2 Re8 Kc1 Rg7 Kd2 Rc8 Rgg1 Rgg8 Kc1 Rce8 Qg3 Re7 Qh2 Rc8 Kd2 Rg8 Qe2 Reg7 Rg3 Re8 Qf1 Rc8 Qf2 Rcg8 Re2 Re8 Kc1 Rgg8 Qh2 Bf3 Re1 Rg7 Kb2 Bd5 Rgg1 Reg8 Qg3 Re8 Re2 Ree7 Kc1 Bf3 Ree1 Bd5 Qh2 Rg8 Ref1 Ree8 Kd2 Re7 Qf2 Rge8 Re1 Rg8 Qg3 Bf3 Qxf3 gxf3; 
7k/4PBNp/7P/2p5/2P5/2rq2Pp/1P3P1K/8 b - - acd 72; acs 3900; bm Qxg3+; c3 "Qxg3+"; ce 0; pm Qxg3+; pv Qxg3+ fxg3 Rc2+ Kg1 h2+ Kh1 Rc1+ Kxh2 Rc2+ Kh3 Rh2+ Kg4 Rh4+ Kg5 Rg4+ Kf6 Rf4+ Ke6 Re4+ Kd7 Rxe7+ Kc6 Rc7+ Kb5 Rb7+ Kxc5 Rc7+ Kb4 Rxc4+ Ka3 Ra4+ Kb3 Rb4+ Kc2 Rc4+ Kb1 Rc1+ Ka2 Ra1+ Kb3 Ra3+; 
8/1B3b1p/7P/p2p4/P2pp1kp/Q7/1N1Pq2P/7K w - - acd 61; acs 4060; bm Qh3+; c3 "Qh3+"; c5 "17 Fishing Rod == http://chichitza.ro/Chess.html?lang=en&aux=17"; c6 Arves.08274; ce 0; id "17 Fishing Rod =="; pm Qh3+; pv Qh3+ Kxh3 Bc8+ Qg4 Nd1 e3 d3 Bg6 Bf5 Bh5 Be6 Be8 Bd7 Qxd7 Nf2+ exf2; 
8/2P1P3/b1B2p2/1pPRp3/2k3P1/P4pK1/nP3p1p/N7 w - - acd 20; acs 2; bm e8=N; c2 "#8; 00:02;"; c3 "e8=N"; c5 "ERET.089 - Unterverwandlung"; ce 32752; dm 2; id "ERET 089 - Unterverwandlung"; pm e8=N; pv e8=N f1=N+ Kf2 h1=N+ Kxf3 Nd2+ Kg2 Ne4 c8=N Bxc8 Nc7 Nd6 Na8 Nf2 Nb6#; 
8/2pN1k2/p4p1p/Pn1R4/3b4/6Pp/1P3K1P/8 w - - acd 69; acs 5100; bm Ke1; c1 "Hard"; c3 "Ke1"; c5 "ERET.066 - Endspiel"; ce 129; id "ERET 066 - Endspiel"; pm Ke1; pv Ke1 Bxb2; 
8/2r3k1/8/1p1p1p2/p2PbPp1/PB4P1/1P1K4/5R2 w - - acd 88; acs 2339; bm Rc1; c0 "fortress"; c3 "Rc1"; ce -296; pm Rc1; pv Rc1 Rxc1 Kxc1 axb3 Kd2 Kf6 Kc3 Ke6 Kb4 Bd3 Kxb3 Be2 Kb4 Kd6 b3 Kc6 Kc3 Bd1 b4 Ba4 Kd3 Kd6 Kd2 Ke6 Kd3 Kf6 Kd2 Kg6 Ke3 Bd1 Kf2 Kf6 Ke3 Bf3 Kd2 Be4 Ke3 Ke6 Kd2 Bg2 Ke3 Bf1 Kd2 Kf6 Kc3 Kg6 Kd2 Bh3 Ke3 Bg2 Kf2 Be4 Ke3 Bf3 Kf2 Kf7 Ke3 Ke7 Kd3 Be4+ Kc3 Kf7 Kd2 Bb1 Ke3 Bc2 Kd2 Bb3 Kc3 Ba4 Kd3 Kg7 Ke3 Kg6 Kd3 Bd1 Kd2 Bb3 Ke2 Kh5 Ke3 Kh6 Kd2 Kg7 Kc3 Ba2 Kb2 Bc4 Kc3 Kg6 Kd2 Ba2 Ke3 Kf6 Kf2 Bb3; 
8/3Pk1p1/1p2P1K1/1P1Bb3/7p/7P/6P1/8 w - - acd 74; acs 344; bm g4; c0 "DeLimburg 1900"; c3 "g4"; c5 "ERET.027 - Zugzwang"; ce 400; id "ERET 027 - Zugzwang"; pm g4; pv g4; 
8/4nk2/1p3p2/1r1p2pp/1P1R1N1P/6P1/3KPP2/8 w - - acd 55; acs 2432; bm Nd3; c0 "Grandelius-Raznikov, EU Youth Chess Ch B18, Albena 2011"; c1 "Hard"; c3 "Nd3"; c4 "arasan19.116"; c5 "ERET.046 - Endspiel"; ce 548; id "ERET 046 - Endspiel"; pm Nd3; pv Nd3; 
8/4Pr1N/8/6PN/8/3K1ppp/4prkb/4Bbnn w - - acd 41; acs 10; bm Nf8; c2 "3"; c3 "Nf8"; c5 "13 Shield +- http://chichitza.ro/Chess.html?lang=en&aux=13"; c6 Arves.10271; ce 32728; dm 20; id "13 Shield +-"; pm Nf8; pv Nf8 Rxf8 e8Q Rf7 Qe7 Rf6 Qe6 Rf8 Qd7 Rf5 Qd4 Rf6 Kc3 Rf8 Kb3 Rf5 Qd6 Rf7 Qd8 Rf5 Ka4 Rf7 g6 Rf5 Qg5 Rf7 g7 Ra7+ Qa5 Rf7 g8N Rf5 Ne7 Rxh5 Ng6 Rxa5+ Bxa5 e1Q Nf4+; 
8/6pp/5k2/1p1r4/4R3/7P/5PP1/5K2 w - - acd 67; acs 169; am Ke2; bm g4; c3 "g4"; c5 "ERET.098 - Endspiel"; ce 0; id "ERET 098 - Endspiel"; pm g4; pv g4 Rd7 f4 Rb7 Rb4 Ke7 Ke2 Kd6 Kd3 Kc5 Re4 b4 Re5+ Kd6 Kc2 Ra7 Rb5 Ra3 Rb7 Rc3+ Kb2 Rxh3 Rxg7 h5 Rg6+ Kc5 gxh5 Rxh5; 
8/7p/5P1k/1p5P/5p2/2p1p3/P1P1P1P1/1K3Nb1 w - - acd 53; acs 2942; bm Ng3; c2 "#26"; c3 "Ng3"; c5 "ERET.032 - Zugzwang"; ce 32716; dm 26; id "ERET 032 - Zugzwang"; pm Ng3; pv Ng3 fxg3 a3 Bf2 Ka1 Be1 Ka2 Bd2 Kb1 Be1 Kc1 Bf2 Kd1 Bg1 Ke1 Bf2+ Kf1 Kxh5 f7 Kg6 f8=Q h5 Qe8+ Kg5 Qxb5+ Kg6 Qe8+ Kh6 Qg8 h4 Qg4 h3 Qxh3+ Kg5 Qe6 Be1 Kxe1 Kf4 a4 Kg5 a5 Kf4 Qd5 Kg4 a6 Kf4 a7 Kg4 a8=Q Kh4 Qa4+; 
8/8/4p1Pk/1rp1K1p1/4P1P1/1nP2Q2/p2b1P2/8 w - - acd 129; acs 1156; bm Kf6; c3 "Kf6"; c5 "ERET.096 - Endspiel"; ce 32640; dm 64; id "ERET 096 - Endspiel"; pm Kf6; pv Kf6 Bxc3+ e5 Bxe5+ Kf7 Rb7+ Qxb7 a1Q g7 Bxg7 Kg8 Nd2 Qb8 Qh1 Qa7 Qa1 Qb7 c4 Qb8 Bh8 Qh2+ Kg6 Qh7+ Kf6 Qxh8+ Ke7 Qxa1 Nb3 Qa7+ Kd6 Qb6+ Ke5 Qc7+ Ke4 Qxc4+ Kf3 Qc3+ Kxf2 Qc2+ Kg3 Qc4 Nc5 Kf7 Nd7 Ke7 Nb6 Qd4 Na8 Qg1+ Kh4 Qd1 Kg3 Kf6 Kf2 Qb3 Kg1 Qb1+ Kf2 Kf7 Ke3 Qc1+ Kd4 Kf6 e5 Kg6 e4 Qb2+ Kd3 Qb3+ Ke2 Qc2+ Kf3 Qd1+ Ke3 Kf5 Nc7 Qb3+ Kd2 Qb4+ Kc1 Qe1+ Kc2 Qe3 Ne8 Kxe4; 
8/8/5p2/6Q1/8/p1K5/p2pp2p/k5B1 w - - acd 39; acs 431; bm Bd4; c0 "http://www.arves.org/arves/index.php/en/awards/awards-replayable/1166-probleemblad-2007-2008"; c3 "Bd4"; c6 Arves.12590; ce 32730; dm 19; pm Bd4; pv Bd4 d1Q Qh4 f5 Bg7 f4 Qe7 h1Q Kc4+ Kb1 Qb4+ Qb3+ Qxb3+ Kc1 Qc3+ Kd1 Qa1+ Kd2 Qxh1 e1Q Bc3+ Ke3 Qxe1+ Kf3 Qh4 a1Q Bxa1 Ke4 Qh5 Ke3 Bd4+ Kd2 Qh2+ Kd1 Kd3 Ke1 Qg1+; 
8/p2p4/r7/1k6/8/pK5Q/P7/b7 w - - acd 171; acs 303; bm Qd3+; c3 "Qd3+"; c5 "ERET.015 - Endspiel"; c6 Arves.14701; ce 32598; dm 85; id "ERET 015 - Endspiel"; pm Qd3+; pv Qd3+ Ka5 Qd5+ Kb6 Qxd7 Kc5 Qf5+ Kb6 Qc8 Ra5 Qd8+ Kb5 Qc7 Ra6 Qb7+ Rb6 Qd5+ Ka6+ Kxa3 Rb5 Qc6+ Rb6 Qd7 Rb7 Qd1 Bb2+ Ka4 Rb6 Qd5 Rb8 Qc6+ Rb6 Qc7 Bf6 Qc8+ Rb7 Qc4+ Kb6 Qe6+ Kc7 Qxf6; 
8/q1p1N1p1/3p1p1p/pk5P/1p2BB2/8/PK3P2/8 w - - acd 86; acs 4860; bm Be3; c3 "Be3"; c5 "15 Harassment +- http://chichitza.ro/Chess.html?lang=en&aux=15"; ce 170; id "15 Harassment   +-"; pm Be3; pv Be3; 
Nq3n1k/8/P1p2Npp/2Kp3R/pp6/n3p3/8/4Q3 w - - acd 59; acs 620; bm Nc7; c0 "Rxh6+ is bad (leads to a draw) while Nc7 wins"; c3 "Nc7"; c6 Arves.15772; ce 32712; dm 28; pm Nc7; pv Nc7 Qd8 Rxh6+ Kg7 a7 Nc4 Nfe8+ Kxh6 a8=Q Nd7+ Kxc6 Nde5+ Kb7 Qxa8+ Kxa8 Kg5 Nxd5 Kf5 Nxe3+ Nxe3 Qxe3 a3 Ng7+ Kf6 Qf4+ Kxg7 Qxe5+ Kh7 Kb7 a2 Qh2+ Kg7 Qxa2 Kf6 Qb2+ Kf5 Kc6 Ke4 Qxb4+ Kd3 Kd5 Ke3 Qe4+ Kf2 Qg4 Ke3 Kc4 Kd2 Qf3 Kc1 Qc3+ Kd1 Kd3 g5 Qa1#;
r1b1k2r/pp3ppp/1qn1p3/2bn4/8/6P1/PPN1PPBP/RNBQ1RK1 w kq - acd 33; acs 119; bm a3; c3 "a3"; c5 "ERET.039 - Entwicklung"; ce 42; id "ERET 039 - Entwicklung"; pm a3; pv a3 O-O b4 Be7 Ne3 Bf6 Ra2 Bd4 Nxd5 exd5 Bb2 Bxb2 Rxb2 d4 Nd2 Rd8 Nb3 Ne5 Nc5 d3 Nxd3 Bg4 Qc1 Nxd3 exd3 Rxd3 Rc2 Rf8 Qf4 Qe6 Rfc1 Bh3 Bxh3 Qxh3 Rc7 Qe6 Qc4 Qxc4 R1xc4 Rfd8 a4; 
r1b1kb1r/1p1n1p2/p3pP1p/q7/3N3p/2N5/P1PQB1PP/1R3R1K b kq - acd 39; acs 103; bm Qg5; c3 "Qg5"; c5 "ERET.018 - Entwicklung"; ce 0; id "ERET 018 - Entwicklung"; pm Qg5 {13}; pv Qg5 Rf4 e5 Nd5 exd4 Qxd4 Kd8 Ne7 Qc5 Nxc8 Kxc8 Qe4 Rb8 Rd1 Kc7 Rf5 Qc6 Rfd5 Kb6 Qf4 Re8 Bf3 Ka7 Rb1 Qc8 Qd4+ Bc5 Rxc5 Nxc5 Qxc5+ Qxc5 Rxb7+ Ka8 Rb3+ Ka7 Rb7+; 
r1b1kq1r/1p1n2bp/p2p2p1/3PppB1/Q1P1N3/8/PP2BPPP/R4RK1 w kq - acd 33; acs 161; bm f4; c3 "f4"; c5 "ERET.049 - Entwicklung"; ce 67; id "ERET 049 - Entwicklung"; pm f4; pv f4; 
r1b1qk1r/pn3pp1/1p2p3/3pP1Bp/1bPN4/4Q1R1/P2N1PP1/R5K1 w - - acd 46; acs 3138; bm Bf6; c3 "Bf6"; ce 277; id "Sikorsky H.-Novak J., ICCF 2017"; pm Bf6; pv Bf6 gxf6 exf6 Qd7 N2f3 Qd6 Qg5 Ke8 Nb5 Qc5 a3 Qxc4 axb4 Qxb5 Ne5 Qxb4 Nxf7 Qb2 Rc1 Qxc1+ Qxc1 Kxf7 Qc7+ Kxf6; 
r1bqr1k1/3n1ppp/p2p1b2/3N1PP1/1p1B1P2/1P6/1PP1Q2P/2KR2R1 w - - acd 46; acs 2827; bm Qxe8+; c1 "Hard"; c3 "Qxe8+"; c5 "ERET.079 - Damenopfer"; ce 174; id "ERET 079 - Damenopfer"; pm Qxe8+; pv Qxe8+ Qxe8 gxf6 g6 Ne7+ Kf8 Rd3 Nxf6 Bxf6 Qb5 Rxd6 Bxf5 Rd5 Qb6 Bd4 Qb7 Bc5 Be6 Nxg6+ Ke8 Ne5 f6 Rd6 fxe5 Rxe6+ Kf7 Re7+ Qxe7 Bxe7 Kxe7 Re1 Kf6 Rxe5 Rg8 Rh5 Rg4 Rxh7 Rxf4 c4 a5 Ra7 Rf5 Kb1 Rh5 Rb7 Rxh2 Rb5 Rh3 Ka2 Rh1 Rxa5 Ke7 Rb5 Rc1 Rxb4 Kd6 Rb5 Kc6 Rh5; 
r1k1n2n/8/pP6/5R2/8/1b1B4/4N3/1K5N w - - acd 42; acs 3295; bm b7+; c1 "Hard"; c3 "b7+"; c5 "ERET.036 - Endspiel"; ce 1233; id "ERET 036 - Endspiel"; pm b7+; pv b7+; 
r1n2N1k/2n2K1p/3pp3/5Pp1/b5R1/8/1PPP4/8 w - - acd 69; acs 3600; bm Ng6+; c1 "Hard"; c3 "Ng6+"; c4 "ERET 002 - Zugzwang"; c5 "ERET.002 - Zugzwang"; ce 0; id "ERET 002 - Zugzwang"; pm Ng6+; pv Ng6+ hxg6 Rg2 Be8+ Kf8 Ra4 b4 Rxb4 c4 Rxc4 d4 Rxd4 Rh2+ Rh4 Rxh4+ gxh4 fxg6 Bxg6; 
r2q1rk1/p1pn1p2/1p2pPp1/3p2B1/2PP3Q/2b5/PP3P1P/2KR2Nb w - - acd 3240; acs 177; bm Rd3; c3 "Rd3"; ce 699; pm Rd3; pv Rd3 Bg2 Rxc3 c5 Nf3 cxd4 Ne5 Nxf6 Ra3 Nh5 Bxd8 Rfxd8 Rxa7 Rf8 Rxa8 Rxa8 Qe7 Rf8 Nd7 Ra8 Nxb6 Rxa2 Nd7 Ra1+ Kd2 Rb1 Qf8+ Kh7 Qxf7+ Kh6 Qf8+ Kh7 c5 Rxb2+ Kc1 Re2 Qf7+ Ng7 Nf8+ Kh8 Nxg6+ Kh7 Nf4 Rxf2 Qg6+ Kh8 Nxg2 Kg8 Qg3 Rf1+ Kd2 Kf8 Nf4 Nf5 Qg5 Ke8 Qg6+ Kd8 Qf6+ Kc7 Nxe6+ Kb7; 
r2qk2r/ppp1b1pp/2n1p3/3pP1n1/3P2b1/2PB1NN1/PP4PP/R1BQK2R w KQkq - acd 41; acs 1800; bm Nxg5; c0 "Smagin,S-Sahovic,D, Biel op (10), EXP 19 1990"; c1 "diff=8"; c2 "Position 3"; c3 "Nxg5"; c4 "OP.0229"; c5 "ERET.095 - Damenopfer"; ce 188; id "ERET 095 - Damenopfer"; pm Nxg5; pv Nxg5; 
r2qk2r/ppp1bppp/2n5/3p1b2/3P1Bn1/1QN1P3/PP3P1P/R3KBNR w KQkq - acd 36; acs 490; bm Qxd5; c3 "Qxd5"; c5 "ERET.008 - Zentrum"; ce 23; id "ERET 008 - Zentrum"; pm Qxd5 {8} Nxd5 {4} Qxb7 {1} a3 {1}; pv Qxd5 Qxd5 Nxd5 Bb4+ Nxb4 Nxb4 Rc1 c6 a3 Nd3+ Bxd3 Bxd3 f3 Nf6 Kf2 Nh5 Bg3 f6 Ne2 Rd8 Rc5 Bxe2 Kxe2 g5 Bf2 Kf7 h4 h6 f4 a6 Kf3 Ng7 f5 Rhg8 Rg1 Rd5 e4 Rxc5 dxc5 Rd8 hxg5 hxg5; 
r2qr1k1/pp1bbp2/n5p1/2pPp2p/8/P2PP1PP/1P2N1BK/R1BQ1R2 w - - acd 43; acs 3240; bm d6; c3 "d6"; c5 "ERET.057 - Abtausch"; ce 89; id "ERET 057 - Abtausch"; pm d6; pv d6 Bxd6; 
r3k2r/5ppp/3pbb2/qp1Np3/2BnP3/N7/PP1Q1PPP/R3K2R w KQkq - acd 37; acs 161; bm Nxb5; c3 "Nxb5"; c5 "ERET.035 - Qualitaetsopfer"; ce 76; id "ERET 035 - Qualitaetsopfer"; pm Nxb5; pv Nxb5; 
r3k2r/pp2pp1p/8/q2Pb3/2P5/4p3/B1Q2PPP/2R2RK1 w kq - acd 34; acs 150; bm c5; c3 "c5"; c5 "ERET.086 - Qualitaetsopfer"; ce 198; id "ERET 086 - Qualitaetsopfer"; pm c5; pv c5 O-O; 
r3r1k1/1bq2ppp/p1p2n2/3ppPP1/4P3/1PbB4/PBP1Q2P/R4R1K w - - acd 38; acs 569; bm gxf6; c3 "gxf6"; c5 "ERET.077 - Rochadeangriff"; ce 360; id "ERET 077 - Rochadeangriff"; pm gxf6; pv gxf6 Bxb2 Qg4 g6 Qh4 Qd8 Rad1 Ba3 Rf3 Be7 Rh3 Bxf6 Qxh7+ Kf8 fxg6 Ke7 Qxf7+ Kd6 Qxb7 Qb8 Qxb8+ Raxb8 Bc4 Rg8 Rg3 Rg7 exd5 c5 Bd3 Rf8 Kg2 Re7 Rg4 Bg7 h4 a5 Kg3 Bh6 h5 Rf4 Be4 a4 c4 axb3 axb3 Ra7 Rxf4 exf4+ Kg4 Re7 Kf3 Ra7 Bd3 Ra3; 
r4rk1/ppp2ppp/1nnb4/8/1P1P3q/PBN1B2P/4bPP1/R2QR1K1 w - - acd 43; acs 7260; bm Qxe2; c0 "Qxe2=10, Bxf7+=6, Nxe2=3, Rxe2=6"; c3 "Qxe2"; c5 "ERET.073 - Mobilitaet"; ce 85; id "ERET 073 - Mobilitaet"; pm Qxe2; pv Qxe2 a5 Nb5 axb4 Nxd6 cxd6 Qb5 Nc8 axb4 Rxa1 Rxa1 Nxd4 Qc4 Nf5 Qxh4 Nxh4 Ra5 b6 Rb5 g6 Bxb6 Nxb6 Rxb6 Nf5 Rb7 Kg7 b5 Kf6 Rd7 Rb8 Rxf7+ Ke5 Bc4 d5 Bd3 Kd4 Bf1 Rh8 Rd7 Kc5 f3 Nd6 Be2 Nxb5 Bxb5 Kxb5 Rxd5+ Kc6 Rd2 Rb8 Kf2 Kc7 Ke3 Rb3+ Ke4 Kc6; 
rnbq3r/pppp4/3b1pkp/5p2/2BP4/4P3/PPP2PPP/RN1QK2R w KQ - acd 17; acs 180; bm Qh5+; c3 "Qh5+"; ce 32752; dm 8; pm Qh5+; pv Qh5+ Kxh5 Bf7+ Kh4 Nd2 Bb4 c3 f4 Nf3+ Kg4 e4 Bxc3+ bxc3 Qe8 h3+; 
rq6/5k2/p3pP1p/3p2p1/6PP/1PB1Q3/2P5/1K6 w - - acd 47; acs 3173; bm Qd3; c3 "Qd3"; c5 "ERET.059 - Endspiel"; ce 781; id "ERET 059 - Endspiel"; pm Qd3; pv Qd3 Qh8; 

Bare test suite with typographical errors corrected and no analysis:

Code: Select all

1k1r2r1/pb5n/1qpp2pP/1pb1p3/4P3/1PNP1QN1/1PPB4/2K2R1R w - - bm b4; 
1k6/bPN2pp1/Pp2p3/p1p5/2pn4/3P4/PPR5/1K6 w - - bm Na8; 
1N4K1/1pp1p3/7k/2r3pP/p2pp1P1/P6N/8/2B5 w - - bm Nc6; 
1N6/2pp4/3k1P2/p7/1pK1P3/5P1P/3r2N1/8 w - - bm e5+; 
1nrrb1k1/1qn1bppp/pp2p3/3pP3/N2P3P/1P1B1NP1/PBR1QPK1/2R5 w - - bm Bxh7+; 
1r1r2k1/2pq3p/4p3/2Q1Pp2/1PNn1R2/P5P1/5P1P/4R2K b - - bm Rb5; 
1r3rk1/1pB2ppp/2b1p3/3pP3/p4Q2/P2B4/1P3PPP/2R3K1 w - - bm Bxh7+; 
1r3rk1/2qbppbp/3p1np1/nP1P2B1/2p2P2/2N1P2P/1P1NB1P1/R2Q1RK1 b - - bm Qb6; 
1r3rk1/3bqpp1/p3p2p/n1ppP2N/2nP1P1P/2PQ1N2/P3B1P1/2R2RK1 w - - am dxc5; bm Ng5; 
1r3rk1/6p1/p1pb1qPp/3p4/4nPR1/2N4Q/PPP4P/2K1BR2 b - - bm Rxb2; 
1r4k1/1nq3pp/pp1pp1r1/8/PPP2P2/6P1/5N1P/2RQR1K1 w - - bm f5; 
2b1r3/5pkp/6p1/4P3/QppqPP2/5RPP/6BK/8 b - - bm c3; 
2b1r3/r2ppN2/8/1p1p1k2/pP1P4/2P3R1/PP3PP1/2K5 w - - bm Nd6+; 
2k2Br1/p6b/Pq1r4/1p2p1b1/1Ppp2p1/Q1P3N1/5RPP/R3N1K1 b - - bm Rf6; 
2k4N/Q1np4/2p2Bpp/1p1P4/pPP1p2P/P7/7q/1K6 w - - bm Nf7; 
2k5/p7/Pp1p1b2/1P1P1p2/2P2P1p/3K3P/5B2/8 w - - bm c5; 
2R5/p4pkp/2br1qp1/5P2/3p4/1P2Q1NP/P1P3P1/6K1 w - - bm Nh5+; 
3kB3/5K2/7p/3p4/3pn3/4NN2/8/1b4B1 w - - bm Nf5; 
4B3/k1K1pp2/p3bq2/2p1p3/1p2P1P1/4P2Q/nR6/8 w - - bm g5; 
4k1br/1K1p1n1r/2p2pN1/P2p1N2/2P3pP/5B2/P2P4/8 w - - bm Kc8; 
4K1k1/8/1p5p/1Pp3b1/8/1P3P2/P1B2P2/8 w - - bm f4; 
4r1k1/1r1np3/1pqp1ppB/p7/2b1P1PQ/2P2P2/P3B2R/3R2K1 w - - bm Bg7; 
5k2/2p4p/6P1/1p3n2/3q4/PB4BN/KP5P/8 w - - bm Ng5; 
5rk1/1ppbq1pp/3p3r/pP1PppbB/2P5/P1BP4/5PPP/3QRRK1 b - - bm Bc1; 
5rk1/6b1/2Bp2p1/1RpP2np/P1P1P2P/3r1p2/1P3BP1/4R1K1 b - - bm Rd2; 
5rk1/p1p1rpb1/q1Pp2p1/3Pp2p/4Pn2/1R4N1/P1BQ1PPP/R5K1 w - - bm Rb4; 
6k1/1qr1p2p/ppN5/3p1N2/6p1/1P1P2Pp/PP2PP1P/2RK4 w - - bm Ncxe7+; 
6kq/2p4p/6P1/5nN1/K7/2P5/7B/3B4 w - - bm Bb3+; 
6r1/2rp1kpp/2qQp3/p3Pp1P/1pP2P2/1P2KP2/P5R1/6R1 w - - bm Rxg7+; 
6r1/6r1/2p1k1pp/p1pbP2q/Pp1p1PpP/1P1P2NR/1KPQ3R/8 b - - bm Qf5; 
7k/4PBNp/7P/2p5/2P5/2rq2Pp/1P3P1K/8 b - - bm Qxg3+; 
8/1B3b1p/7P/p2p4/P2pp1kp/Q7/1N1Pq2P/7K w - - bm Qh3+; 
8/2P1P3/b1B2p2/1pPRp3/2k3P1/P4pK1/nP3p1p/N7 w - - bm e8=N; 
8/2pN1k2/p4p1p/Pn1R4/3b4/6Pp/1P3K1P/8 w - - bm Ke1; 
8/2r3k1/8/1p1p1p2/p2PbPp1/PB4P1/1P1K4/5R2 w - - bm Rc1; 
8/3Pk1p1/1p2P1K1/1P1Bb3/7p/7P/6P1/8 w - - bm g4; 
8/4nk2/1p3p2/1r1p2pp/1P1R1N1P/6P1/3KPP2/8 w - - bm Nd3; 
8/4Pr1N/8/6PN/8/3K1ppp/4prkb/4Bbnn w - - bm Nf8; 
8/6pp/5k2/1p1r4/4R3/7P/5PP1/5K2 w - - am Ke2; bm g4; 
8/7p/5P1k/1p5P/5p2/2p1p3/P1P1P1P1/1K3Nb1 w - - bm Ng3; 
8/8/4p1Pk/1rp1K1p1/4P1P1/1nP2Q2/p2b1P2/8 w - - bm Kf6; 
8/8/5p2/6Q1/8/p1K5/p2pp2p/k5B1 w - - bm Bd4; 
8/p2p4/r7/1k6/8/pK5Q/P7/b7 w - - bm Qd3+; 
8/q1p1N1p1/3p1p1p/pk5P/1p2BB2/8/PK3P2/8 w - - bm Be3; 
Nq3n1k/8/P1p2Npp/2Kp3R/pp6/n3p3/8/4Q3 w - - bm Nc7; 
r1b1k2r/pp3ppp/1qn1p3/2bn4/8/6P1/PPN1PPBP/RNBQ1RK1 w kq - bm a3; 
r1b1kb1r/1p1n1p2/p3pP1p/q7/3N3p/2N5/P1PQB1PP/1R3R1K b kq - bm Qg5; 
r1b1kq1r/1p1n2bp/p2p2p1/3PppB1/Q1P1N3/8/PP2BPPP/R4RK1 w kq - bm f4; 
r1b1qk1r/pn3pp1/1p2p3/3pP1Bp/1bPN4/4Q1R1/P2N1PP1/R5K1 w - - bm Bf6; 
r1bqr1k1/3n1ppp/p2p1b2/3N1PP1/1p1B1P2/1P6/1PP1Q2P/2KR2R1 w - - bm Qxe8+; 
r1k1n2n/8/pP6/5R2/8/1b1B4/4N3/1K5N w - - bm b7+; 
r1n2N1k/2n2K1p/3pp3/5Pp1/b5R1/8/1PPP4/8 w - - bm Ng6+; 
r2q1rk1/p1pn1p2/1p2pPp1/3p2B1/2PP3Q/2b5/PP3P1P/2KR2Nb w - - bm Rd3; 
r2qk2r/ppp1b1pp/2n1p3/3pP1n1/3P2b1/2PB1NN1/PP4PP/R1BQK2R w KQkq - bm Nxg5; 
r2qk2r/ppp1bppp/2n5/3p1b2/3P1Bn1/1QN1P3/PP3P1P/R3KBNR w KQkq - bm Qxd5; 
r2qr1k1/pp1bbp2/n5p1/2pPp2p/8/P2PP1PP/1P2N1BK/R1BQ1R2 w - - bm d6; 
r3k2r/5ppp/3pbb2/qp1Np3/2BnP3/N7/PP1Q1PPP/R3K2R w KQkq - bm Nxb5; 
r3k2r/pp2pp1p/8/q2Pb3/2P5/4p3/B1Q2PPP/2R2RK1 w kq - bm c5; 
r3r1k1/1bq2ppp/p1p2n2/3ppPP1/4P3/1PbB4/PBP1Q2P/R4R1K w - - bm gxf6; 
r4rk1/ppp2ppp/1nnb4/8/1P1P3q/PBN1B2P/4bPP1/R2QR1K1 w - - bm Qxe2; 
rnbq3r/pppp4/3b1pkp/5p2/2BP4/4P3/PPP2PPP/RN1QK2R w KQ - bm Qh5+; 
rq6/5k2/p3pP1p/3p2p1/6PP/1PB1Q3/2P5/1K6 w - - bm Qd3; 

[peter]

Hi Dann!

I think that it is a mate in 28 and not a mate in 17 like the original problem states, because black's best response after Nc7 is Qd8 and not gxh5 as suggested in the original problem. From Arves, the original problem is stated as follows:
[pgn] [Event "1.hm e4 e5 10 JT"] [Site ""] [Date "2017"] [Round ""] [White "Peter S. Krug & Mario García"] [Black "No.139"] [Result "1-0"] [EventDate "2017"] [SetUp "1"] [FEN "Nq3n1k/8/P1p2Npp/2Kp3R/pp6/n3p3/8/4Q3 w - - 0 1"] [PlyCount "33"] [SourceDate "2017.11.29"] 1. Nc7 $1 (1. Rxh6+ $2 Kg7 2. Nc7 Kxf6 3. Kxc6 Nc4 $11) 1... gxh5 (1... Ne6+ 2. Nxe6 Qa7+ 3. Kxc6 Qxa6+ 4. Kd7 $18) 2. Qg3 $1 (2. Qg1 $2 Nd7+ 3. Nxd7 Qxc7 $11) 2... Ne6+ 3. Nxe6 Qxg3 (3... Qb5+ 4. Kd6 $18) 4. a7 Qd6+ $1 5. Kxd6 Nb5+ 6. Ke7 Nxa7 7. Kf8 $1 (7. Kf7 $2 Nc8 8. Nf4 Ne7 9. Kxe7 Kg7 10. N6xh5+ Kg8 $11) (7. Nf4 $2 Kg7 8. Ne8+ Kg8 $11) 7... Nc8 8. Nf4 Ne7 9. Nd3 Ng6+ (9... e2 10. Ne5 e1=Q 11. Nf7#) 10. Kf7 e2 11. Kxg6 e1=Q 12. Nxe1 b3 13. Nd3 b2 14. Nxb2 a3 15. Nd3 a2 16. Ne5 a1=Q 17. Nf7# 1-0 [/pgn]

27 at most.

After Backward of your line:

Nq3n1k/8/P1p2Npp/2Kp3R/pp6/n3p3/8/4Q3 w - - 0 1

Analysis by Cfish 111118 x64 POP N:

1.Nc7 Qd8 2.Rxh6+ Kg7 3.a7 Qe7+ 4.Kxc6 Qxf6+ 5.Kb7 Qf7 6.a8Q Nb5 7.Qd8 Qxc7+ 8.Qxc7+ Nxc7 9.Rh3 Nce6 10.Rxe3 b3 11.Rxe6 Nxe6 12.Qxe6 d4 13.Qe7+ Kh6 14.Qh4+ Kg7 15.Qxd4+ Kh6 16.Qxa4 b2 17.Qb4 Kh7 18.Qxb2 Kh6 19.Qe2 Kg5 20.Qe4 Kh5 21.Kc7 Kh6 22.Kd6 Kg7 23.Qf4 Kg8 24.Ke7 Kg7 25.Qf8+ Kh7 26.Kf6 g5 27.Qg7#
+- (#27) Depth: 44/54 00:04:02 8333MN

And of course you're right about best move as for length to mate, but that's not the theme of the study, it isn't a mate in x- problem, so the thematic try to show, is rather the taking of the Rook asap, I'd say.

So I kept author's line as PV, making a .pgn of my own, the deviations to your line commented with "Dann" to make it easier for you to find them.

[pgn] [Event "2018, CCC VL 62"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "Krug, Peter"] [Black "Garcia, Mario"] [Result "1-0"] [Annotator "Martan,Peter"] [SetUp "1"] [FEN "Nq3n1k/8/P1p2Npp/2Kp3R/pp6/n3p3/8/4Q3 w - - 0 1"] [PlyCount "33"] 1. Nc7 gxh5 (1... Qd8 $1 2. Rxh6+ Kg7 3. a7 Nb5 (3... Nc4 4. Nfe8+ Kxh6 5. a8=Q Ne6+ (5... Nd7+ 6. Kxc6 Nde5+ 7. Kb7 Qxa8+ 8. Kxa8 Kg5 9. Nxd5 a3 (9... Kf5 $5 {Dann} 10. Qb1+ (10. Nxe3+ $5 {Dann} Nxe3 11. Qxe3 a3 12. Ng7+ Kf6 13. Qf4+ Kxg7 14. Qxe5+ Kf7 15. Kb7 b3 16. Qd5+ Kf6 17. Qxb3 a2 18. Qxa2 Kf5 19. Qa4 Ke6 20. Kc6 Ke5 21. Qg4 g5 22. Kc5 Kf6 23. Kd6 Kg7 24. Qxg5+ Kf7 25. Kd7 Kf8 26. Ke6 Ke8 27. Qe7#) 10... Ke6 11. Nec7+ Kd7 12. Qxb4 Nd6 13. Qxa4+ Nc6 14. Nb4 Ke7 15. Qxc6 Kf6 16. Qxd6+ Kf5 17. Nd3 Kg4 18. Qf4+ Kh3 19. Qg5 Kh2 20. Nf4 e2 21. Qg2#) 10. Qf1 Nb6+ 11. Nxb6 a2 12. Qf6+ Kg4 13. Qxe5 g5 14. Nf6+ Kf3 15. Nbd5 b3 16. Qxe3+ Kg2 17. Qc3 Kf1 18. Ne4 a1=Q+ 19. Qxa1+ Ke2 20. Qa6+ Kf3 21. Qd3+ Kg4 22. Nf2+ Kh5 23. Qh7#) 6. Kxc6 Ne5+ 7. Kb7 Qxa8+ 8. Kxa8 Nxc7+ 9. Nxc7 Kg5 10. Qxe3+ Kf5 11. Nxd5 Nd7 12. Qh3+ Ke5 13. Qxd7 b3 14. Qb5 b2 15. Nb6+ Kd4 16. Qxb2+ Kd3 17. Nxa4 Ke4 18. Nc5+ Kf4 19. Qd4+ Kf5 20. Qe4+ Kf6 21. Nd7+ Kg5 22. Qf3 Kh6 23. Qf6 Kh7 24. Nf8+ Kg8 25. Ne6 Kh7 26. Qg7#) 4. Nfe8+ Kxh6 5. Qxe3+ g5 6. a8=Q Nxc7 7. Nxc7 Qxa8 8. Nxa8 b3 9. Qc3 Ne6+ 10. Kxc6 Kg6 11. Qd3+ Kf6 12. Nc7 Nxc7 13. Kxc7 b2 14. Qd4+ Kf5 15. Qxb2 Ke4 16. Kd6 a3 17. Qxa3 d4 18. Qg3 g4 19. Qxg4+ Ke3 20. Kd5 d3 21. Qe4+ Kf2 22. Qxd3 Kg2 23. Qe2+ Kg3 24. Ke5 Kh4 25. Qg2 Kh5 26. Kf5 Kh6 27. Qg6#) 2. Qg3 Ne6+ 3. Nxe6 Qxg3 4. a7 Qg8 5. Nxg8 Kxg8 6. a8=Q+ Kf7 7. Nd4 Nc2 8. Qb7+ Kg6 9. Qxc6+ Kg5 10. Qxd5+ Kh4 11. Nxc2 Kg4 12. Nd4 a3 13. Qf3+ Kg5 14. Qf5+ Kh4 15. Ne2 a2 16. Qf4+ Kh3 17. Qg3# 1-0 [/pgn]

[Vinvin]

The really difficult problem from this set of 62 is this one:
Nq3n1k/8/P1p2Npp/2Kp3R/pp6/n3p3/8/4Q3 w - - acd 59; acs 620; bm Nc7; c0 "Rxh6+ is bad (leads to a draw) while Nc7 wins"; c3 "Nc7"; c6 ...

Thanks to your message, I just see that Arena misinterpreted the EPD. "Rxh6?" was a remark but Arena accepts it as a bm

Code: Select all

14) Na8-c7, Rh5xh6    Rh5xh6     0     Rh5xh6    0    Rh5xh6      0    Rh5xh6    0      4         0,0

[Dann Corbit]

The really difficult problem from this set of 62 is this one:
Nq3n1k/8/P1p2Npp/2Kp3R/pp6/n3p3/8/4Q3 w - - acd 59; acs 620; bm Nc7; c0 "Rxh6+ is bad (leads to a draw) while Nc7 wins"; c3 "Nc7"; c6 ...

Thanks to your message, I just see that Arena misinterpreted the EPD. "Rxh6?" was a remark but Arena accepts it as a bm

Code: Select all

14) Na8-c7, Rh5xh6    Rh5xh6     0     Rh5xh6    0    Rh5xh6      0    Rh5xh6    0      4         0,0

On your best moves, there are a few check signs missing.

[Vinvin]

The really difficult problem from this set of 62 is this one:
Nq3n1k/8/P1p2Npp/2Kp3R/pp6/n3p3/8/4Q3 w - - acd 59; acs 620; bm Nc7; c0 "Rxh6+ is bad (leads to a draw) while Nc7 wins"; c3 "Nc7"; c6 ...

Thanks to your message, I just see that Arena misinterpreted the EPD. "Rxh6?" was a remark but Arena accepts it as a bm

Code: Select all

14) Na8-c7, Rh5xh6    Rh5xh6     0     Rh5xh6    0    Rh5xh6      0    Rh5xh6    0      4         0,0

On your best moves, there are a few check signs missing.

Yes, I saw your corrections but the most missing "+" come from the ERET position, I copy-past as it was.