tcec practical hard mate test

[Uri Blass]

next 2 positions in the suite

2B5/8/3p1n2/5K2/2P4k/8/2R5/b7 w - - 0 1 bm Rc1 dm 24
8/1R6/3pk3/p7/8/R7/P7/1KB2q2 w - - 0 1 bm Re3+ dm 38

analysis with slowchess after going forward and backward not from clear hash

FEN: 2B5/8/3p1n2/5K2/2P4k/8/2R5/b7 w - - 0 1

Slow64-avx2 [001]:

39/48 00:02 16,334k 6,980k +M24 Rc2-c1 Ba1-b2 Rc1-d1 Nf6-e8 Rd1-d3 Ne8-f6 Rd3xd6 Nf6-g8 Bc8-d7 Ng8-e7+ Kf5-e6 Ne7-g8 c4-c5 Bb2-c3 Ke6-f7 Bc3-a5 Rd6-g6 Ng8-h6+ Rg6xh6+ Kh4-g5 Rh6-f6 Ba5-d8 c5-c6 Bd8-c7 Kf7-e6 Bc7-b8 Rf6-f7 Kg5-g4 Ke6-d5+ Kg4-g5 Kd5-e4 Kg5-g6 Bd7-e6 Bb8-h2 c6-c7 Bh2xc7 Rf7xc7 Kg6-g5 Ke4-e5 Kg5-g6 Rc7-c3 Kg6-g7 Ke5-f5 Kg7-h6 Kf5-f6 Kh6-h7 Rc3-h3+

8/1R6/3pk3/p7/8/R7/P7/1KB2q2 w - - 0 1

FEN: 8/1R6/3pk3/p7/8/R7/P7/1KB2q2 w - - 0 1

Slow64-avx2 [001]:

45/75 00:02 17,209k 5,873k +M38 Ra3-e3+ Ke6-d5 Rb7-b2 Qf1-f5+ Rb2-c2 a5-a4 Bc1-b2 Qf5-g6 Re3-c3 a4-a3 Rc3xa3 Qg6-e4 Ra3-c3 Qe4-e1+ Rc2-c1 Qe1-e4+ Kb1-a1 Qe4-e2 Rc3-a3 Kd5-e6 Ra3-a4 Ke6-d7 Ra4-d4 Qe2-e5 Rc1-d1 Kd7-e6 Bb2-a3 d6-d5 Ba3-b2 Ke6-d6 Rd4-a4 Qe5-e2 Rd1-g1 Kd6-c6 Ra4-a5 Qe2-e3 Rg1-d1 Qe3-g5 Rd1-c1+ Kc6-d7 Ra5-a7+ Kd7-e6 Ra7-a6+ Ke6-f5 Rc1-e1 Qg5-g3 Ra6-f6+ Kf5-g5 Re1-f1 Kg5-h4 Rf6-h6+ Kh4-g5 Rh6-h8 Kg5-g4 Rh8-g8+ Kg4-h3 Rf1-g1 Qg3-f2 Rg8-h8+ Qf2-h4 Rh8xh4+ Kh3xh4 Bb2-d4 Kh4-h3 a2-a4 Kh3-h2 a4-a5 Kh2-h3 a5-a6 Kh3-h4 a6-a7 Kh4-h5 a7-a8Q Kh5-h4 Qa8-h8+

[Uri Blass]

next position
slow chess after some backward analysis

8/4kp1p/6p1/6P1/5R1P/2B4r/2K5/8 w - - 0 1 bm Kb3 dm 34

FEN: 8/4kp1p/6p1/6P1/5R1P/2B4r/2K5/8 w - - 0 1

Slow64-avx2 [001]:

42/67 00:01 10,863k 7,242k +M34 Kc2-b3 Rh3-h1 Kb3-c4 Rh1-c1 Kc4-d4 Ke7-e6 Rf4-f6+ Ke6-e7 Bc3-b4+ Ke7-e8 Rf6-f4 f7-f5 g5xf6/ep Ke8-f7 Bb4-c3 Rc1-b1 Kd4-c4 Rb1-b7 Bc3-d4 h7-h6 Kc4-d5 g6-g5 h4xg5 h6xg5 Rf4-e4 Rb7-d7+ Kd5-c6 Rd7xd4 Re4xd4 Kf7xf6 Kc6-d5 Kf6-f5 Rd4-e4 g5-g4 Kd5-d4 Kf5-g5 Re4-e8 Kg5-f6 Re8-g8 Kf6-f5 Rg8-g7 Kf5-f4 Rg7-f7+ Kf4-g5 Kd4-e5 Kg5-g6 Rf7-f5 g4-g3 Rf5-f3 g3-g2 Rf3-g3+ Kg6-f7 Rg3xg2 Kf7-e7 Rg2-g7+ Ke7-e8 Ke5-e6 Ke8-d8 Rg7-h7 Kd8-c8 Ke6-d6 Kc8-b8 Kd6-c6 Kb8-a8 Kc6-b6 Ka8-b8 Rh7-h8+

update of the hard test positions to compare chess engines

7R/2k1p2P/r2rP3/8/3p1R2/8/2P2p2/2K5 w - - 0 1 bm Rc8 dm 26
r7/4pk2/PP1r4/2R2P2/8/1KP5/8/R7 w - - 0 1 bm Rb5 dm 14
4r1k1/r7/2P1n1P1/1P1B1R2/P2b4/K7/3B4/7R w - - 0 1 bm b6 dm 13
8/6R1/3P4/4Q1p1/2p1P3/3rkP1P/6PK/4q3 w - - 0 1 bm Qc5+ dm 24
r6k/5p1P/1n3Np1/3P2P1/2n1PK2/1R6/p7/2R5 w - - 0 1 bm Ra1 dm 18
8/4n3/2p5/1k6/p1p1B2R/8/PB2n3/1K6 w - - 0 1 bm Be5 dm 22
1r2k3/2qb1p2/p3pBr1/4P1Pp/2P5/3Q4/1P1RBPP1/1K6 w - - 0 1 bm Bxh5 dm 20
8/3b4/kp4r1/3P4/p1P1p2R/4N3/1R5K/8 w - - 0 1 bm Rh7 dm 20
4r3/2P1rk2/4p1p1/2K1Qp1p/3P3P/2P2P2/6P1/8 w - - 0 1 bm d5 dm 23
8/8/2n5/7P/3K4/k1pB4/3b4/1R6 w - - 0 1 bm Kd5 dm 25
2r5/p4k2/6p1/1KP3Pp/1PR4P/4R3/8/6r1 w - - 0 1 bm c6 dm 23
2B5/8/3p1n2/5K2/2P4k/8/2R5/b7 w - - 0 1 bm Rc1 dm 24
8/1R6/3pk3/p7/8/R7/P7/1KB2q2 w - - 0 1 bm Re3+ dm 38
8/4kp1p/6p1/6P1/5R1P/2B4r/2K5/8 w - - 0 1 bm Kb3 dm 34

[peter]

update of the hard test positions to compare chess engines

Thanks for collecting, but how should these positions be used for any comparison between more then 2 engines or settings of one?
With what a hardware- time?
Having seen your own problems with DsTM, which one results to be counted "solved"?
SlowChess would probably sparkle as for getting any output with somewhat "correct" DsTM but take very long for the (probably) best one lines, Huntsman being probably only second best as for #-output at all but have at least a chance to get correct DsTM in the easier ones in about 10 minutes or more. The harder ones even Huntsman would have to have >30 minutes for, started with empty hash.
Are specialised mate search- programs to be tested too at all?
With which one settings? Finding best params for Chest e.g. would help for some of the postions, not for others, anyhow it was a big difference as for this one engine, same with Gustav.

Huntsman has mate search checked by default and SlowChess uses it in game playing too, but e.g. Houdini4? DTM to be set in option or not? MateFish (other one program from Jörg Oster) needs any DTM to be set to work at all, but for that you have to use a GUI like Arena or console- mode allowing to run mate in x- mode,
regards

[Uri Blass]

update of the hard test positions to compare chess engines

Thanks for collecting, but how should these positions be used for any comparison between more then 2 engines or settings of one?
With what a hardware- time?
Having seen your own problems with DsTM, which one results to be counted "solved"?
SlowChess would probably sparkle as for getting any output with somewhat "correct" DsTM but take very long for the (probably) best one lines, Huntsman being probably only second best as for #-output at all but have at least a chance to get correct DsTM in the easier ones in about 10 minutes or more. The harder ones even Huntsman would have to have >30 minutes for, started with empty hash.
Are specialised mate search- programs to be tested too at all?
With which one settings? Finding best params for Chest e.g. would help for some of the postions, not for others, anyhow it was a big difference as for this one engine, same with Gustav.

Huntsman has mate search checked by default and SlowChess uses it in game playing too, but e.g. Houdini4? DTM to be set in option or not? MateFish (other one program from Jörg Oster) needs any DTM to be set to work at all, but for that you have to use a GUI like Arena or console- mode allowing to run mate in x- mode,
regards

You can have some type of comparison between 2 engines:

1)Which engine needs less time to see a mate score
2)Which engine can see shorter mate if you give it a fixed time to search(you can use one hour and in case the distance is equal the winner is the side who saw the fastest mate faster).

next position(I use the TCEC games and it is from game 33 ) is the following mate in 20 or faster
You can see the game in the following link
https://tcec-chess.com/#div=p&game=33&season=23

The idea is to have positions based on all the premier TCEC division games(so far I always can find mates that the engines did not find)

r3n3/P4r1p/3R2nk/2B1p3/2P1PpBP/5P2/8/R6K w - - 0 1 bm Rc6 dm 20

Slow64-avx2 [001]:
2/1 00:00 1k 0 +7.04 Rd6-c6 Rf7-b7 Bc5-f8+ Ne8-g7
3/3 00:00 3k 0 +7.36 Rd6-c6 Rf7-b7 Bc5-b6
4/5 00:00 6k 0 +6.84 Rd6-c6 Ne8-f6 Bg4-e6 Rf7xa7 Bc5xa7 Ng6xh4
5/5 00:00 8k 0 +6.84 Rd6-c6 Ne8-f6 Bg4-e6 Rf7xa7 Bc5xa7 Ng6xh4
6/7 00:00 13k 0 +7.00 Rd6-c6 Ne8-f6 Bg4-e6 Rf7xa7 Bc5xa7 Ng6xh4 Be6-h3 Kh6-g5
7/7 00:00 16k 0 +7.00 Rd6-c6 Ne8-f6 Bg4-e6 Rf7xa7 Bc5xa7 Ng6xh4 Be6-h3 Kh6-g5 Ra1-g1+
8/13 00:00 56k 5,571k +7.19 Rd6-c6 Ne8-f6 Bg4-e6 Rf7-b7 Bc5-b6 Ra8xa7 Bb6xa7 Rb7-b3 Be6-d5 Nf6xd5 c4xd5 Rb3xf3
9/13 00:00 80k 7,968k +6.84 Rd6-c6 Ne8-f6 Bg4-e6 Rf7-g7 Bc5-b6 Kh6-h5 c4-c5 Ng6xh4 Be6-c4 Nf6-d7
9/13+ 00:00 89k 8,863k +6.85 Rd6xg6+
9/14 00:00 109k 10,923k +7.00 Rd6xg6+ h7xg6 Bg4-e6 Rf7-b7 Be6-d5 Ra8xa7 Ra1xa7 Rb7-b1+ Kh1-g2 Ne8-f6 Bd5-e6 Rb1-b3
9/14+ 00:00 114k 5,711k +7.01 Rd6-b6
9/14 00:00 120k 5,998k +7.32 Rd6-b6 Rf7-c7 Rb6-b8 Ra8xa7 Bc5xa7 Ne8-f6 Bg4-e6 Rc7-g7 Be6-d5 Ng6xh4
10/14 00:00 163k 8,128k +6.88 Rd6-b6 Rf7-c7 Rb6-b8 Ra8xa7 Bc5xa7 Ne8-f6 Bg4-e6 Ng6xh4 Rb8-b3 Nh4-g6 Rb3-b2 Ng6-h4
10/14+ 00:00 164k 8,180k +6.89 Rd6-c6
10/14 00:00 169k 5,638k +7.56 Rd6-c6 Ne8-f6 Bg4-e6 Rf7-g7 Be6-f5 Nf6-h5 Bf5xg6 h7xg6 Bc5-b6 Nh5-g3+ Kh1-g2 Rg7-b7
10/14+ 00:00 170k 5,651k +7.67 Rd6xg6+
11/17 00:00 389k 5,556k +8.16 Rd6-c6 Ne8-f6 Rc6-c8 Rf7xa7 Ra1xa7 Ra8xa7 Bc5xa7 Ng6xh4 c4-c5 Kh6-g5 c5-c6 h7-h5 Bg4xh5
12/20 00:00 524k 5,824k +7.96 Rd6-c6 Rf7-f6 Bg4-d7 Rf6-f7 Rc6xg6+ Kh6xg6 Bd7-e6 Rf7-b7 Be6-d5 Ra8xa7 Ra1xa7 Rb7-b1+ Kh1-g2 Rb1-b2+ Kg2-f1 Rb2-b3 Kf1-e2
13/21+ 00:00 743k 5,714k +9.46 Rd6-c6
13/21 00:00 777k 5,976k +9.08 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-h8 Bc5xe7 Ra8xa7 Be7-f6+ Ne8xf6 Rc6xf6 Ra7-a1+ Kh1-h2
13/22 00:00 869k 5,792k +9.08 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-h8 Bc5xe7 Ra8xa7 Be7-f6+ Ne8xf6 Rc6xf6 Ra7-a1+ Kh1-h2
14/22 00:00 1,005k 5,909k +9.16 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-h8 Bc5xe7 Ra8xa7 Be7-f6+ Kh8-g8 Bf6xe5 Ra7-a5 c4-c5 Ra5-a3 Be5xf4
15/26 00:00 1,386k 6,024k +9.88 Rd6-c6 Rf7-f6 Ra1-a6 Rf6xc6 Ra6xc6 Kh6-g7 h4-h5 Ng6-e7 h5-h6+ Kg7-h8 Bc5xe7 Ra8xa7 Be7-f6+ Ne8xf6 Rc6xf6 Ra7-a8 Rf6-f5 Ra8-e8 Kh1-g2 Re8-a8
16/31 00:00 1,951k 6,292k +10.12 Rd6-c6 Rf7-f6 Ra1-a6 Rf6xc6 Ra6xc6 Kh6-g7 h4-h5 Ng6-e7 h5-h6+ Kg7-f7 Bg4-h5+ Ne7-g6 Bh5xg6+ h7xg6 h6-h7 Kf7-g7 Rc6xg6+ Kg7xh7 Rg6-e6 Ne8-g7 Re6-e7 Kh7-g6 Re7xe5 Kg6-f6
17/31 00:00 2,909k 6,464k +10.24 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Ng6-h4 h5-h6+ Kg7-f7 Bg4-h5+ Nh4-g6 Rc6xf6+ Ne8xf6 Bh5xg6+ h7xg6 Ra6-b6 Nf6-d7 Rb6-b7 Kf7-e6 Bc5-a3 g6-g5 h6-h7
18/33 00:00 3,554k 6,582k +10.52 Rd6-c6 Ne8-f6 Rc6-c8 Ra8xa7 Ra1xa7 Rf7xa7 Bc5xa7 Ng6-e7 Rc8-c5 Ne7-g6 h4-h5 Nf6xg4 h5xg6 h7xg6 f3xg4 Kh6-g5 Rc5xe5+ Kg5xg4 c4-c5 f4-f3 c5-c6 Kg4-f4
19/33 00:00 6,619k 7,042k +11.12 Rd6-c6 Ne8-f6 Rc6-c8 Ra8xa7 Ra1xa7 Rf7xa7 Bc5xa7 Ng6-e7 Rc8-c5 Ne7-g6 h4-h5 Nf6xh5 Bg4xh5 Kh6xh5 Kh1-g2 Kh5-g5 Ba7-b8 Kg5-f6 Rc5-c6+ Kf6-e7 Kg2-f2 Ke7-f7 Rc6xg6 h7xg6 Bb8xe5 g6-g5 Kf2-e2
20/35 00:02 19,269k 7,271k +12.32 Rd6-c6 Ne8-f6 Rc6-c8 Ra8xa7 Ra1xa7 Rf7xa7 Bc5xa7 Ng6-e7 Rc8-c5 Ne7-g6 h4-h5 Nf6xg4 h5xg6 Ng4-e3 Rc5xe5 Ne3xc4 g6xh7 Kh6xh7 Re5-f5 Nc4-b2 Rf5xf4 Kh7-g8 Kh1-g2 Nb2-d3 Kg2-g3 Nd3-c1 Rf4-f5 Nc1-d3 Ba7-d4
21/37 00:04 35,291k 7,430k +12.63 Rd6-c6 Kh6-g7 h4-h5 Rf7-f6 Rc6xf6 Ne8xf6 h5xg6 Nf6xg4 f3xg4 h7xg6 Kh1-g2 Kg7-f6 Ra1-a6+ Kf6-f7 Bc5-d6 Kf7-e6 Bd6-b8+ Ke6-d7 Bb8xe5 f4-f3+ Kg2xf3 g6-g5 Be5-f6 Kd7-c8 Bf6xg5 Kc8-b7
22/40 00:07 53,964k 7,485k +12.92 Rd6-c6 Ne8-f6 Rc6-c8 Ra8xa7 Ra1xa7 Rf7xa7 Bc5xa7 Ng6-e7 Rc8-c5 Ne7-g6 h4-h5 Nf6xh5 Bg4xh5 Kh6xh5 Kh1-g2 Ng6-h4+ Kg2-f2 Nh4-g6 Ba7-b8 Kh5-g5 Bb8xe5 Kg5-h6 Rc5-c6 Kh6-g5 Rc6xg6+ h7xg6 c4-c5 Kg5-h4 Be5xf4 g6-g5 Bf4xg5+
23/40 00:10 81,213k 7,444k +13.24 Rd6-c6 Ne8-f6 Rc6-c8 Ra8xa7 Ra1xa7 Rf7xa7 Bc5xa7 Ng6-e7 Rc8-c5 Kh6-g7 Rc5xe5 Kg7-f7 Bg4-h5+ Nf6xh5 Re5xh5 Ne7-c6 Rh5xh7+ Kf7-g6 Rh7-h8 Nc6-e5 Kh1-g2 Ne5xc4 Rh8-g8+ Kg6-f7 Rg8-g4 Nc4-b2 Rg4xf4+ Kf7-g8 Ba7-c5 Nb2-d3 Rf4-f5 Kg8-h7 h4-h5 Kh7-g8 h5-h6
24/47 00:15 113,049k 7,442k +13.36 Rd6-c6 Ne8-f6 Rc6-c8 Ra8xa7 Ra1xa7 Rf7xa7 Bc5xa7 Ng6-e7 Rc8-c5 Ne7-g6 h4-h5 Nf6xh5 Bg4xh5 Kh6xh5 Kh1-g2 Kh5-h6 Ba7-b8 Ng6-f8 Bb8xe5 Kh6-g6 Rc5-c6+ Kg6-f7 Rc6-f6+ Kf7-g7 Rf6xf8+ Kg7xf8 Be5xf4 Kf8-f7 Kg2-g3 Kf7-e7 Kg3-g4 Ke7-d7 Bf4-e3 Kd7-d6 Kg4-g5 Kd6-d7 Kg5-h6 Kd7-e7 Kh6xh7 Ke7-f8 c4-c5
25/47 00:34 253,384k 7,450k +13.84 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-f7 Bg4-h5+ Ne7-g6 Kh1-g2 Ra8-d8 Kg2-h3 Rd8-a8 Bh5xg6+ h7xg6 Kh3-h4 g6-g5+ Kh4xg5 Kf7-g8 Kg5-f5 Kg8-h7 Kf5xe5 Kh7-h8 Ke5xf4 Kh8-h7 Bc5-d4 Kh7-g8 Kf4-f5 Kg8-h7 Rc6-e6 Kh7-g8 Re6xe8+ Ra8xe8 c4-c5 Kg8-f7
26/49+ 01:17 593,177k 7,691k +17.91 Rd6-c6
26/60 01:51 826,383k 7,406k +18.00 Rd6-c6 Ne8-f6 Rc6-c8 Ra8xc8 Bg4xc8 Rf7xa7 Ra1xa7 Nf6-g8 Bc8-f5 Ng6xh4 Ra7xh7+ Kh6-g5 Rh7-g7+ Kg5-f6 Rg7xg8 Nh4xf3 Rg8-g6+ Kf6-f7 Rg6-e6 Nf3-h4 Re6xe5 f4-f3 Bc5-f2 Nh4-g2 Bf5-g4 Ng2-f4 Re5-f5+ Kf7-e6 Rf5xf4+ Ke6-e5 Rf4xf3 Ke5xe4 Kh1-g2 Ke4-e5 Rf3-f5+ Ke5-d6 Rf5-d5+
26/60 02:01 898,915k 7,369k +15.24 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 Bc5xe7 Ra8xa7 h5-h6+ Kg7-f7 Be7-c5 Ra7-a8 Bg4-h5+ Kf7-g8 Rc6-e6 Ne8-g7 h6xg7 Kg8xg7 Re6xe5 Kg7-h6 Re5-f5 Kh6-g7 Kh1-g2 Ra8-d8 Rf5xf4 h7-h6 Kg2-g3 Kg7-h7 Rf4-f7+ Kh7-g8 Rf7-a7 Rd8-d1 Bh5-f7+ Kg8-g7 Kg3-f4 Rd1-h1 e4-e5 Rh1-h2 Bf7-d5+ Kg7-g6 Bd5-e4+
27/60+ 02:29 1,081,241k 7,215k +20.12 Rd6-c6
27/60 03:36 1,539,333k 7,099k +23.80 Rd6-c6 Ne8-f6 Rc6-c8 Rf7xa7 Ra1xa7 Ra8xa7 Bc5xa7 Ng6xh4 c4-c5 Nf6xg4 f3xg4 Nh4-g6 Rc8-c6 f4-f3 Rc6xg6+ Kh6xg6 c5-c6 Kg6-g5 c6-c7 f3-f2 Ba7xf2 Kg5xg4 c7-c8Q+ Kg4-f3 Qc8-f5+ Kf3-e2 Kh1-g2 Ke2-d3 Qf5xe5 Kd3-c2 Qe5-c7+ Kc2-b3 Qc7xh7 Kb3-c3 e4-e5 Kc3-b3 Qh7-b7+ Kb3-c3 Qb7-f7 Kc3-c2 Qf7-h7+
27/60 04:18 1,842,794k 7,116k +16.48 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 Bc5xe7 Ra8xa7 h5-h6+ Kg7-f7 Be7-c5 Ra7-a8 Bg4-h5+ Kf7-g8 Rc6-e6 Ne8-g7 h6xg7 Kg8xg7 Re6xe5 Ra8-a1+ Kh1-g2 Ra1-a2+ Kg2-h3 Ra2-d2 Kh3-g4 Rd2-d8 Kg4xf4 Kg7-h6 Re5-g5 Rd8-b8 e4-e5 Rb8-h8 e5-e6 Rh8-d8 e6-e7 Rd8-a8
28/60 04:22 1,867,447k 7,110k +18.16 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 Bc5xe7 Ra8xa7 h5-h6+ Kg7-f7 Be7-c5 Ra7-a8 Bg4-h5+ Kf7-g8 Rc6-e6 Ne8-g7 h6xg7 Kg8xg7 Re6xe5 Ra8-a1+ Kh1-g2 Ra1-c1 Re5-g5+ Kg7-f6 Rg5-f5+ Kf6-e6 Bh5-f7+ Ke6-d7 e4-e5 Kd7-c7 e5-e6 Rc1xc4 e6-e7 Rc4-c2+ Kg2-f1 Rc2xc5 Rf5xc5+ Kc7-d6 e7-e8Q Kd6xc5 Qe8-e5+ Kc5-c6 Bf7-e8+ Kc6-b6 Qe5-d6+ Kb6-b7 Qd6xf4 Kb7-b6 Qf4-d6+ Kb6-a5 Qd6-c5+
29/62 04:28 1,907,815k 7,112k +20.60 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 Bc5xe7 Ra8xa7 h5-h6+ Kg7-f7 Be7-c5 Ra7-a8 Bg4-h5+ Kf7-g8 Rc6-e6 Ne8-g7 h6xg7 Kg8xg7 Re6xe5 Ra8-a1+ Kh1-g2 Ra1-a8 Kg2-h3 Ra8-c8 Kh3-g4 Kg7-f6 Re5-f5+ Kf6-e6 Bh5-f7+ Ke6-d7 e4-e5 Rc8xc5 e5-e6+ Kd7-d6 Rf5xc5 Kd6xc5 e6-e7 h7-h5+ Kg4xf4 h5-h4 e7-e8Q Kc5-b4 Qe8-e1+ Kb4-c5 Qe1-e7+ Kc5-b6 Qe7xh4 Kb6-a5 Qh4-e7
30/65+ 06:33 2,766,405k 7,025k +29.32 Rd6-c6
30/65 08:16 3,358,230k 6,764k +34.20 Rd6-c6 Kh6-g7 h4-h5 Ne8-c7 Bc5-b6 Nc7-d5 e4xd5 Ng6-e7 Rc6-c7 Ne7-g8 Rc7xf7+ Kg7xf7 Bg4-e6+ Kf7-e7 Be6xg8 e5-e4 f3xe4 Ke7-d6 c4-c5+ Kd6-e5 Bg8xh7 f4-f3 d5-d6 Ke5-e6 Bh7-f5+ Ke6-e5 d6-d7 Ra8-h8 a7-a8Q Rh8xa8 Ra1xa8 f3-f2 Kh1-g2 Ke5-f4 Kg2xf2 Kf4-g5 d7-d8Q+
30/65+ 08:31 3,452,418k 6,748k +M239 Rd6-c6
30/65- 08:37 3,493,094k 6,744k +M250 Rd6-c6 Kh6-g7
31/65 09:58 3,985,147k 6,654k +35.68 Rd6-c6 Kh6-g7 h4-h5 Rf7-f6 Rc6xf6 Ne8xf6 h5xg6 h7xg6 Bg4-e6 g6-g5 Kh1-g2 g5-g4 Bc5-d6 Kg7-g6 Bd6xe5 Nf6-h7 Be6-f5+ Kg6-f7 Bf5xh7 Kf7-e6 Be5xf4 g4-g3 Bh7-f5+ Ke6-e7 Kg2xg3 Ra8-g8+ Kg3-f2 Rg8-a8 Ra1-a6 Ke7-e8 Bf5-e6 Ke8-e7 Be6-d5 Ra8-h8 Bf4-b8 Rh8-e8 a7-a8Q Ke7-f8 Qa8-b7 Re8-e7 Ra6-f6+
32/65+ 09:59 3,986,579k 6,653k +M239 Rd6-c6
32/65- 10:26 4,146,393k 6,615k +M250 Rd6-c6 Kh6-g7
33/65 15:19 6,001,980k 6,531k +M23 Rd6-c6 Kh6-g7 h4-h5 Rf7-c7 Rc6xc7+ Ne8xc7 h5xg6 h7xg6 Bc5-d6 Nc7-e8 Bd6xe5+ Kg7-f7 Bg4-d7 Ne8-f6 Be5xf6 Kf7xf6 Bd7-c6 Ra8xa7 Ra1xa7 Kf6-e5 Kh1-g2 Ke5-d4 Bc6-d5 g6-g5 Ra7-a6 g5-g4 f3xg4 Kd4-e3 e4-e5 f4-f3+ Bd5xf3 Ke3-d4 e5-e6 Kd4xc4 e6-e7 Kc4-b5 Bf3-e2+ Kb5-c5 e7-e8Q Kc5-b4 Qe8-e5 Kb4-b3 Ra6-b6+ Kb3-c2 Qe5-b2+
34/65 15:19 6,003,286k 6,531k +M22 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-f7 Bg4-h5+ Ne7-g6 Kh1-g2 Ra8-d8 Bh5xg6+ h7xg6 Kg2-h3 Rd8-a8 Kh3-h4 Kf7-g8 Kh4-g5 Kg8-f7 Rc6xg6 Ra8-c8 Rg6-b6 Rc8-a8 Rb6-b8 Ne8-c7 h6-h7 Nc7-e6+ Kg5-g4 Ne6xc5 h7-h8Q Kf7-e6 Rb8-b6+ Ke6-d7 Qh8-g7+ Kd7-c8 Rb6-c6+ Kc8-d8 Rc6-c7 Kd8-e8 Qg7-e7+
35/65 15:19 6,003,311k 6,531k +M22 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-f7 Bg4-h5+ Ne7-g6 Kh1-g2 Ra8-d8 Bh5xg6+ h7xg6 Kg2-h3 Rd8-a8 Kh3-h4 Kf7-g8 Kh4-g5 Kg8-f7 Rc6xg6 Ra8-c8 Rg6-b6 Rc8-a8 Rb6-b8 Ne8-c7 h6-h7 Nc7-e6+ Kg5-g4 Ne6xc5 h7-h8Q Kf7-e6 Rb8-b6+ Ke6-d7 Qh8-g7+ Kd7-c8 Rb6-c6+ Kc8-d8 Rc6-c7 Kd8-e8 Qg7-e7+
36/65 15:19 6,003,334k 6,531k +M22 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-f7 Bg4-h5+ Ne7-g6 Kh1-g2 Ra8-d8 Bh5xg6+ h7xg6 Kg2-h3 Rd8-a8 Kh3-h4 Kf7-g8 Kh4-g5 Kg8-f7 Rc6xg6 Ra8-c8 Rg6-b6 Rc8-a8 Rb6-b8 Ne8-c7 h6-h7 Nc7-e6+ Kg5-g4 Ne6xc5 h7-h8Q Kf7-e6 Rb8-b6+ Ke6-d7 Qh8-g7+ Kd7-c8 Rb6-c6+ Kc8-d8 Rc6-c7 Kd8-e8 Qg7-e7+
37/65 15:19 6,003,367k 6,531k +M22 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-f7 Bg4-h5+ Ne7-g6 Kh1-g2 Ra8-d8 Bh5xg6+ h7xg6 Kg2-h3 Rd8-a8 Kh3-h4 Kf7-g8 Kh4-g5 Kg8-f7 Rc6xg6 Ra8-c8 Rg6-b6 Rc8-a8 Rb6-b8 Ne8-c7 h6-h7 Nc7-e6+ Kg5-g4 Ne6xc5 h7-h8Q Kf7-e6 Rb8-b6+ Ke6-d7 Qh8-g7+ Kd7-c8 Rb6-c6+ Kc8-d8 Rc6-c7 Kd8-e8 Qg7-e7+
38/65 15:19 6,003,403k 6,531k +M22 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-f7 Bg4-h5+ Ne7-g6 Kh1-g2 Ra8-d8 Bh5xg6+ h7xg6 Kg2-h3 Rd8-a8 Kh3-h4 Kf7-g8 Kh4-g5 Kg8-f7 Rc6xg6 Ra8-c8 Rg6-b6 Rc8-a8 Rb6-b8 Ne8-c7 h6-h7 Nc7-e6+ Kg5-g4 Ne6xc5 h7-h8Q Kf7-e6 Rb8-b6+ Ke6-d7 Qh8-g7+ Kd7-c8 Rb6-c6+ Kc8-d8 Rc6-c7 Kd8-e8 Qg7-e7+
39/65 15:19 6,003,437k 6,531k +M22 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-f7 Bg4-h5+ Ne7-g6 Kh1-g2 Ra8-d8 Bh5xg6+ h7xg6 Kg2-h3 Rd8-a8 Kh3-h4 Kf7-g8 Kh4-g5 Kg8-f7 Rc6xg6 Ra8-c8 Rg6-b6 Rc8-a8 Rb6-b8 Ne8-c7 h6-h7 Nc7-e6+ Kg5-g4 Ne6xc5 h7-h8Q Kf7-e6 Rb8-b6+ Ke6-d7 Qh8-g7+ Kd7-c8 Rb6-c6+ Kc8-d8 Rc6-c7 Kd8-e8 Qg7-e7+
40/65 15:19 6,003,471k 6,531k +M22 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-f7 Bg4-h5+ Ne7-g6 Kh1-g2 Ra8-d8 Bh5xg6+ h7xg6 Kg2-h3 Rd8-a8 Kh3-h4 Kf7-g8 Kh4-g5 Kg8-f7 Rc6xg6 Ra8-c8 Rg6-b6 Rc8-a8 Rb6-b8 Ne8-c7 h6-h7 Nc7-e6+ Kg5-g4 Ne6xc5 h7-h8Q Kf7-e6 Rb8-b6+ Ke6-d7 Qh8-g7+ Kd7-c8 Rb6-c6+ Kc8-d8 Rc6-c7 Kd8-e8 Qg7-e7+
41/65 15:19 6,003,552k 6,531k +M22 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-f7 Bg4-h5+ Ne7-g6 Kh1-g2 Ra8-d8 Bh5xg6+ h7xg6 Kg2-h3 Rd8-a8 Kh3-h4 Kf7-g8 Kh4-g5 Kg8-f7 Rc6xg6 Ra8-c8 Rg6-b6 Rc8-a8 Rb6-b8 Ne8-c7 h6-h7 Nc7-e6+ Kg5-g4 Ne6xc5 h7-h8Q Kf7-e6 Rb8-b6+ Ke6-d7 Qh8-g7+ Kd7-c8 Rb6-c6+ Kc8-d8 Rc6-c7 Kd8-e8 Qg7-e7+
42/65 15:19 6,003,592k 6,531k +M22 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-f7 Bg4-h5+ Ne7-g6 Kh1-g2 Ra8-d8 Bh5xg6+ h7xg6 Kg2-h3 Rd8-a8 Kh3-h4 Kf7-g8 Kh4-g5 Kg8-f7 Rc6xg6 Ra8-c8 Rg6-b6 Rc8-a8 Rb6-b8 Ne8-c7 h6-h7 Nc7-e6+ Kg5-g4 Ne6xc5 h7-h8Q Kf7-e6 Rb8-b6+ Ke6-d7 Qh8-g7+ Kd7-c8 Rb6-c6+ Kc8-d8 Rc6-c7 Kd8-e8 Qg7-e7+
43/65 15:19 6,003,670k 6,531k +M22 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-f7 Bg4-h5+ Ne7-g6 Kh1-g2 Ra8-d8 Bh5xg6+ h7xg6 Kg2-h3 Rd8-a8 Kh3-h4 Kf7-g8 Kh4-g5 Kg8-f7 Rc6xg6 Ra8-c8 Rg6-b6 Rc8-a8 Rb6-b8 Ne8-c7 h6-h7 Nc7-e6+ Kg5-g4 Ne6xc5 h7-h8Q Kf7-e6 Rb8-b6+ Ke6-d7 Qh8-g7+ Kd7-c8 Rb6-c6+ Kc8-d8 Rc6-c7 Kd8-e8 Qg7-e7+
44/65 15:19 6,003,815k 6,531k +M22 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-f7 Bg4-h5+ Ne7-g6 Kh1-g2 Ra8-d8 Bh5xg6+ h7xg6 Kg2-h3 Rd8-a8 Kh3-h4 Kf7-g8 Kh4-g5 Kg8-f7 Rc6xg6 Ra8-c8 Rg6-b6 Rc8-a8 Rb6-b8 Ne8-c7 h6-h7 Nc7-e6+ Kg5-g4 Ne6xc5 h7-h8Q Kf7-e6 Rb8-b6+ Ke6-d7 Qh8-g7+ Kd7-c8 Rb6-c6+ Kc8-d8 Rc6-c7 Kd8-e8 Qg7-e7+
45/65 15:20 6,009,703k 6,530k +M22 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-f7 Bg4-h5+ Ne7-g6 Kh1-g2 Ra8-d8 Bh5xg6+ h7xg6 Kg2-h3 Rd8-a8 Kh3-h4 Kf7-g8 Kh4-g5 Kg8-f7 Rc6xg6 Ra8-c8 Rg6-b6 Rc8-a8 Rb6-b8 Ne8-c7 h6-h7 Nc7-e6+ Kg5-g4 Ne6xc5 h7-h8Q Kf7-e6 Rb8-b6+ Ke6-d7 Qh8-g7+ Kd7-c8 Rb6-c6+ Kc8-d8 Rc6-c7 Kd8-e8 Qg7-e7+
46/65 15:22 6,025,960k 6,529k +M22 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-f7 Bg4-h5+ Ne7-g6 Kh1-g2 Ra8-d8 Bh5xg6+ h7xg6 Kg2-h3 Rd8-a8 Kh3-h4 Kf7-g8 Kh4-g5 Kg8-f7 Rc6xg6 Ra8-c8 Rg6-b6 Rc8-a8 Rb6-b8 Ne8-c7 h6-h7 Nc7-e6+ Kg5-g4 Ne6xc5 h7-h8Q Kf7-e6 Rb8-b6+ Ke6-d7 Qh8-g7+ Kd7-c8 Rb6-c6+ Kc8-d8 Rc6-c7 Kd8-e8 Qg7-e7+
47/65 16:31 6,428,832k 6,484k +M22 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-f7 Bg4-h5+ Ne7-g6 Kh1-g2 Ra8-d8 Bh5xg6+ h7xg6 Kg2-h3 Rd8-a8 Kh3-h4 Kf7-g8 Kh4-g5 Kg8-f7 Rc6xg6 Ra8-c8 Rg6-b6 Rc8-a8 Rb6-b8 Ne8-c7 h6-h7 Nc7-e6+ Kg5-g4 Ne6xc5 h7-h8Q Kf7-e6 Rb8-b6+ Ke6-d7 Qh8-g7+ Kd7-c8 Rb6-c6+ Kc8-d8 Rc6-c7 Kd8-e8 Qg7-e7+
48/65 17:22 6,740,932k 6,466k +M22 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-f7 Bg4-h5+ Ne7-g6 Kh1-g2 Ra8-d8 Bh5xg6+ h7xg6 Kg2-h3 Rd8-a8 Kh3-h4 Kf7-g8 Kh4-g5 Kg8-f7 Rc6xg6 Ra8-c8 Rg6-b6 Rc8-a8 Rb6-b8 Ne8-c7 h6-h7 Nc7-e6+ Kg5-g4 Ne6xc5 h7-h8Q Kf7-e6 Rb8-b6+ Ke6-d7 Qh8-g7+ Kd7-c8 Rb6-c6+ Kc8-d8 Rc6-c7 Kd8-e8 Qg7-e7+
49/73 17:58 6,956,751k 6,450k +M22 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 h5-h6+ Kg7-f7 Bg4-h5+ Ne7-g6 Kh1-g2 Ra8-d8 Bh5xg6+ h7xg6 Kg2-h3 Rd8-a8 Kh3-h4 Kf7-g8 Kh4-g5 Kg8-f7 Rc6xg6 Ra8-c8 Rg6-b6 Rc8-a8 Rb6-b8 Ne8-c7 h6-h7 Nc7-e6+ Kg5-g4 Ne6xc5 h7-h8Q Kf7-e6 Rb8-b6+ Ke6-d7 Qh8-g7+ Kd7-c8 Rb6-c6+ Kc8-d8 Rc6-c7 Kd8-e8 Qg7-e7+
50/73 34:06 13,911,548k 6,799k +M20 Rd6-c6 Rf7-f6 Ra1-a6 Kh6-g7 h4-h5 Rf6xc6 Ra6xc6 Ng6-e7 Bc5xe7 Ra8xa7 h5-h6+ Kg7-f7 Be7-h4 Ra7-a1+ Kh1-g2 Ra1-a2+ Kg2-h3 Ra2-a8 Bg4-h5+ Kf7-f8 Rc6-e6 Ne8-g7 h6xg7+ Kf8xg7 Bh4-f6+ Kg7-g8 Re6-e7 Ra8-f8 Re7-g7+ Kg8-h8 Bf6xe5 h7-h6 Bh5-g6 Rf8-f6 Be5xf6 h6-h5 Bg6-h7 h5-h4 Rg7-a7+

[Joerg Oster]

update of the hard test positions to compare chess engines

Thanks for collecting, but how should these positions be used for any comparison between more then 2 engines or settings of one?
With what a hardware- time?
Having seen your own problems with DsTM, which one results to be counted "solved"?
SlowChess would probably sparkle as for getting any output with somewhat "correct" DsTM but take very long for the (probably) best one lines, Huntsman being probably only second best as for #-output at all but have at least a chance to get correct DsTM in the easier ones in about 10 minutes or more. The harder ones even Huntsman would have to have >30 minutes for, started with empty hash.
Are specialised mate search- programs to be tested too at all?
With which one settings? Finding best params for Chest e.g. would help for some of the postions, not for others, anyhow it was a big difference as for this one engine, same with Gustav.

Huntsman has mate search checked by default and SlowChess uses it in game playing too, but e.g. Houdini4? DTM to be set in option or not? MateFish (other one program from Jörg Oster) needs any DTM to be set to work at all, but for that you have to use a GUI like Arena or console- mode allowing to run mate in x- mode,
regards

For me the interesting question is what it is that makes these positions so tough for engines.
High number of legal moves, in general? Tactics? Promotions? (which most likely leads to problem #1)
Bad move ordering for this type of problems?

[Uri Blass]

7R/2k1p2P/r2rP3/8/3p1R2/8/2P2p2/2K5 w - - 0 1 bm Rc8 dm 26
r7/4pk2/PP1r4/2R2P2/8/1KP5/8/R7 w - - 0 1 bm Rb5 dm 14
4r1k1/r7/2P1n1P1/1P1B1R2/P2b4/K7/3B4/7R w - - 0 1 bm b6 dm 13
8/6R1/3P4/4Q1p1/2p1P3/3rkP1P/6PK/4q3 w - - 0 1 bm Qc5+ dm 24
r6k/5p1P/1n3Np1/3P2P1/2n1PK2/1R6/p7/2R5 w - - 0 1 bm Ra1 dm 18
8/4n3/2p5/1k6/p1p1B2R/8/PB2n3/1K6 w - - 0 1 bm Be5 dm 22
1r2k3/2qb1p2/p3pBr1/4P1Pp/2P5/3Q4/1P1RBPP1/1K6 w - - 0 1 bm Bxh5 dm 20
8/3b4/kp4r1/3P4/p1P1p2R/4N3/1R5K/8 w - - 0 1 bm Rh7 dm 20
4r3/2P1rk2/4p1p1/2K1Qp1p/3P3P/2P2P2/6P1/8 w - - 0 1 bm d5 dm 23
8/8/2n5/7P/3K4/k1pB4/3b4/1R6 w - - 0 1 bm Kd5 dm 25
2r5/p4k2/6p1/1KP3Pp/1PR4P/4R3/8/6r1 w - - 0 1 bm c6 dm 23
2B5/8/3p1n2/5K2/2P4k/8/2R5/b7 w - - 0 1 bm Rc1 dm 24
8/1R6/3pk3/p7/8/R7/P7/1KB2q2 w - - 0 1 bm Re3+ dm 38
8/4kp1p/6p1/6P1/5R1P/2B4r/2K5/8 w - - 0 1 bm Kb3 dm 34
r3n3/P4r1p/3R2nk/2B1p3/2P1PpBP/5P2/8/R6K w - - 0 1 bm Rc6 dm 20
2n5/2r1b3/2k5/P7/1p6/1K1QB3/1P6/8 w - - 7 1 bm Ka4 dm 24

analysis of last problem by slowchess




FEN: 2n5/2r1b3/2k5/P7/1p6/1K1QB3/1P6/8 w - - 7 1 dm 24

Slow64-avx2 [001]:
2/1 00:00 4k 0 +7.44 Be3-f4 Rc7-d7 Qd3-c4+ Kc6-b7 Qc4-b5+ Nc8-b6 Qb5xb6+
3/3 00:00 10k 0 +7.48 Be3-f4 Be7-d6 Qd3-a6+ Kc6-d5 Bf4xd6 Nc8xd6
3/5 00:00 14k 0 +7.60 Qd3-c4+ Kc6-d7 Qc4-b5+ Rc7-c6 a5-a6
4/7 00:00 17k 0 +7.72 Qd3-c4+ Kc6-b7 a5-a6+ Kb7-b8 Qc4-b5+ Kb8-a8 Qb5-d5+ Ka8-b8
4/7 00:00 22k 0 +7.88 Qd3-a6+ Kc6-d7 Qa6-b5+ Rc7-c6 a5-a6 Be7-d6
5/9 00:00 25k 0 +7.80 Qd3-a6+ Kc6-d7 Qa6-b5+ Rc7-c6 a5-a6 Be7-d6 a6-a7
6/10 00:00 36k 0 +7.20 Qd3-a6+ Kc6-d7 Qa6-b5+ Rc7-c6 Qb5-b7+ Rc6-c7 Qb7-d5+ Nc8-d6 a5-a6 Rc7-c6 a6-a7
6/10+ 00:00 38k 0 +7.21 Be3-f4
6/10 00:00 47k 0 +7.52 Be3-f4 Be7-d6 Bf4xd6 Nc8xd6 Qd3-f3+ Kc6-d7 Qf3-g4+ Kd7-c6 Qg4-g2+
6/11+ 00:00 57k 0 +7.53 Qd3-e4+
7/11 00:00 87k 8,714k +7.56 Be3-f4 Be7-d6 Bf4xd6 Nc8xd6 Qd3-f3+ Kc6-d7 Qf3-h3+ Kd7-d8 a5-a6
7/11+ 00:00 90k 9,019k +7.57 Qd3-e4+
7/11+ 00:00 94k 9,369k +7.57 Qd3-c4+
8/14 00:00 125k 6,272k +7.68 Be3-f4 Be7-d6 Qd3-f3+ Kc6-d7 Qf3-h3+ Kd7-d8 Qh3-h4+ Kd8-d7 Qh4-g4+ Kd7-d8 Qg4-g5+ Kd8-d7 Qg5-f5+ Kd7-d8 Bf4xd6
8/14+ 00:00 142k 7,094k +7.69 Qd3-e4+
8/14 00:00 165k 5,514k +8.00 Qd3-e4+ Kc6-d7 a5-a6 Be7-d6 Qe4-g4+ Kd7-c6 Qg4-e6 Nc8-a7 Qe6-c4+ Kc6-d7 Qc4-g4+ Kd7-c6 Qg4-e4+ Kc6-d7
9/14 00:00 171k 5,699k +8.00 Qd3-e4+ Kc6-d7 a5-a6 Be7-d6 Qe4-g4+ Kd7-c6 Qg4-e6 Nc8-a7 Qe6-c4+ Kc6-d7 Qc4-g4+ Kd7-c6 Qg4-e4+ Kc6-d7 Qe4-d5
10/17 00:00 212k 7,058k +8.40 Qd3-e4+ Kc6-d7 a5-a6 Be7-d6 Qe4-g4+ Kd7-c6 Qg4-e6 Nc8-e7 Be3-f4 Ne7-c8 a6-a7 Kc6-b7 a7-a8Q+ Kb7xa8 Bf4xd6 Nc8xd6
11/19 00:00 297k 5,942k +8.72 Qd3-e4+ Kc6-d7 a5-a6 Be7-d6 Qe4-g4+ Kd7-d8 Qg4-g5+ Bd6-e7 Qg5-g8+ Kd8-d7 Qg8-d5+ Be7-d6 Qd5-f5+ Kd7-d8 Be3-g5+ Bd6-e7 Qf5-d5+ Rc7-d7 Bg5xe7+
12/20 00:00 382k 6,363k +8.44 Qd3-e4+ Kc6-d7 a5-a6 Be7-d6 Qe4-g4+ Kd7-d8 Qg4-g5+ Kd8-d7 Qg5-f5+ Kd7-d8 Be3-d4 Bd6-e7 Qf5-e6 Be7-d6 Bd4-f6+
12/20+ 00:00 490k 6,121k +8.45 Kb3-a4
12/21 00:00 753k 5,794k +9.72 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 Bf4xd6 Be7xd6 a5-a6 Rc7-a7 Ka4-b5 Ra7-c7 Qd3-d5 b4-b3 Kb5-b6 Rc7-c8 Qd5-f7+ Bd6-e7 Qf7xb3
13/26 00:00 1,077k 5,984k +10.44 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 b4-b3 Bf4xd6 Be7xd6 Qd3-b5+ Kd7-d8 Qb5-b8+ Kd8-d7 a6-a7 Rc7-c4+ Ka4xb3 Bd6xb8 a7xb8N+ Kd7-c7 Kb3xc4 Kc7xb8 Kc4-d5
14/26 00:00 1,486k 6,462k +10.44 Kb3-a4 Nc8-d6 Be3-f4 Rc7-b7 Bf4xd6 Be7xd6 Qd3-e4+ Kc6-c7 a5-a6 Rb7-b6 a6-a7 Rb6-a6+ Ka4-b5 Ra6xa7 Qe4-c6+ Kc7-d8 Qc6xd6+ Ra7-d7 Qd6xd7+ Kd8xd7 Kb5xb4 Kd7-d8 Kb4-b5
15/26 00:00 1,566k 6,265k +10.56 Kb3-a4 Nc8-d6 Be3-f4 Rc7-b7 Bf4xd6 Be7xd6 Qd3-e4+ Kc6-c7 a5-a6 Rb7-b6 a6-a7 Rb6-a6+ Ka4-b5 Ra6xa7 Qe4-c6+ Kc7-d8 Qc6xd6+ Ra7-d7 Qd6xd7+ Kd8xd7 Kb5xb4 Kd7-d8 Kb4-b5 Kd8-e8 Kb5-a6 Ke8-f8 b2-b4
16/34 00:00 2,347k 6,904k +10.68 Kb3-a4 Nc8-d6 Be3-f4 Rc7-b7 Bf4xd6 Be7xd6 Qd3-e4+ Kc6-c7 a5-a6 Rb7-b6 a6-a7 Rb6-a6+ Ka4-b5 Ra6xa7 Qe4-c6+ Kc7-d8 Qc6xd6+ Ra7-d7 Qd6-b8+ Kd8-e7 Kb5-c6 Rd7-d8 Qb8xb4+ Ke7-e8 Qb4-b5 Ke8-f8 Kc6-c7 Rd8-e8 Qb5xe8+ Kf8xe8 b2-b4 Ke8-f8
17/36 00:00 3,268k 7,263k +10.76 Kb3-a4 Nc8-d6 Be3-f4 Rc7-b7 Bf4xd6 Be7xd6 Qd3-e4+ Kc6-c7 a5-a6 Rb7-b6 a6-a7 Rb6-a6+ Ka4-b5 Ra6xa7 Qe4-c6+ Kc7-d8 Qc6xd6+ Ra7-d7 Qd6-b8+ Kd8-e7 Kb5-c6 Rd7-d8 Qb8xb4+ Ke7-f7 Qb4-h4 Kf7-e8 Qh4-h5+ Ke8-f8 Qh5-f5+ Kf8-e8 Qf5-b5 Ke8-f8 Kc6-c7 Rd8-e8
18/39 00:01 9,565k 8,540k +11.48 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 Be7-f8 Bf4xd6 Bf8xd6 Qd3-b5+ Kd7-e6 Qb5-b6 Rc7-h7 Qb6-e3+ Bd6-e5 Ka4xb4 Ke6-f6 Kb4-b3 Rh7-h8 Qe3-f3+ Kf6-e6 Qf3-c6+ Ke6-e7 Qc6-b7+ Ke7-d6 a6-a7 Kd6-c5 Qb7-b4+
19/39 00:01 15,535k 8,877k +11.78 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 Be7-f8 Bf4xd6 Bf8xd6 Qd3-b5+ Kd7-e6 Qb5-b6 Rc7-d7 a6-a7 Rd7xa7+ Qb6xa7 Bd6-e7 Ka4-b5 Ke6-f6 Qa7-f2+ Kf6-g7 Qf2-f3 Kg7-g6 Qf3-g2+ Kg6-f6 Kb5-c6 Kf6-f7 Qg2-e2 b4-b3 Qe2-c4+ Kf7-f6 Qc4-f1+ Kf6-g5 Qf1-b5+
20/39 00:01 16,322k 8,823k +11.78 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 Be7-f8 Bf4xd6 Bf8xd6 Qd3-b5+ Kd7-e6 Qb5-b6 Rc7-h7 Qb6-e3+ Bd6-e5 Ka4xb4 Rh7-h1 Kb4-b5 Rh1-a1 Qe3-e4 Ke6-d6 b2-b4 Be5-b2 Qe4-g6+ Kd6-e7 a6-a7 Ke7-f8 Qg6-b6 Kf8-f7 Qb6-b7+ Kf7-f6 a7-a8Q
21/42 00:03 29,105k 8,662k +12.20 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 Be7-f8 Bf4xd6 Bf8xd6 Qd3-b5+ Kd7-e6 Qb5-b6 Rc7-h7 Qb6-e3+ Bd6-e5 Ka4xb4 Rh7-h1 Kb4-b5 Rh1-a1 Qe3-e4 Ke6-f6 b2-b4 Kf6-e6 Kb5-b6 Ke6-f6 b4-b5 Ra1-f1 Qe4-c4 Rf1-b1 a6-a7 Rb1-a1
22/46 00:06 57,816k 8,827k +12.48 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 Be7-f8 Bf4xd6 Bf8xd6 Qd3-b5+ Kd7-e6 Qb5-b6 Rc7-h7 Qb6-e3+ Bd6-e5 Ka4xb4 Rh7-h1 Kb4-b5 Rh1-a1 Qe3-e4 Ke6-f6 b2-b4 Ra1-a3 Kb5-b6 Be5-d6 a6-a7 Bd6-g3 a7-a8Q Ra3xa8 Qe4xa8 Kf6-g5 Qa8-e4 Bg3-h4 Kb6-b7 Kg5-h5 Qe4-e6 Kh5-g5
23/46 00:06 61,224k 8,847k +12.76 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 Be7-f8 Bf4xd6 Bf8xd6 Qd3-b5+ Kd7-e6 Qb5-b6 Rc7-h7 Qb6-e3+ Bd6-e5 Ka4xb4 Rh7-h1 Kb4-b5 Rh1-a1 Qe3-e4 Ke6-d6 Qe4-c6+ Kd6-e7 b2-b4 Be5-f6 a6-a7 Ke7-f7 a7-a8Q Ra1xa8 Qc6xa8 Kf7-g7 Qa8-g2+ Kg7-h6 Qg2-h3+ Kh6-g5 Qh3-h1 Bf6-g7 Qh1-g1+ Kg5-f6 Kb5-c6 Bg7-h6 Qg1-a1+
24/49+ 00:14 134,285k 9,417k +16.25 Kb3-a4
24/49 00:14 134,712k 9,420k +16.25 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 Be7-f8 Bf4xd6 Bf8xd6 Qd3-b5+ Kd7-e6 Qb5-b6 Rc7-d7 a6-a7 Rd7xa7+ Qb6xa7 Bd6-e7 Ka4-b5 Ke6-f6 Qa7-b6+ Kf6-g7 Qb6-g1+ Kg7-f7 Qg1-f1+ Kf7-g7 Qf1-g2+ Kg7-f7 Qg2-f2+ Be7-f6 Qf2-a7+ Kf7-g6 Qa7-g1+ Kg6-f7 Qg1-f1 b4-b3 Qf1-f3 Kf7-g6 Qf3xb3 Kg6-g7 Qb3-d5 Kg7-h6 Qd5-g2 Bf6-h4 Qg2-g4
24/49 00:14 136,125k 9,427k +16.25 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 Be7-f8 Bf4xd6 Bf8xd6 Qd3-b5+ Kd7-e6 Qb5-b6 Rc7-d7 a6-a7 Rd7xa7+ Qb6xa7 Bd6-e7 Ka4-b5 Ke6-f6 Qa7-b6+ Kf6-g7 Qb6-g1+ Kg7-f7 Qg1-f1+ Kf7-g7 Qf1-g2+ Kg7-f7 Qg2-f2+ Be7-f6 Qf2-a7+ Kf7-g6 Qa7-g1+ Kg6-f7 Qg1-f1 b4-b3 Qf1-f3 Kf7-g6 Qf3xb3 Kg6-g7 Qb3-d5 Kg7-h6 Qd5-b7 Bf6-h4 Qb7-f7 Kh6-g5 Qf7-f3 Bh4-g3 Qf3xg3+
25/49 00:14 138,651k 9,438k +16.25 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 Be7-f8 Bf4xd6 Bf8xd6 Qd3-b5+ Kd7-e6 Qb5-b6 Rc7-d7 a6-a7 Rd7xa7+ Qb6xa7 Bd6-e7 Ka4-b5 Ke6-f6 Qa7-b6+ Kf6-g7 Qb6-g1+ Kg7-f7 Qg1-f1+ Kf7-e6 Qf1-f3 Ke6-e5 Qf3-e3+ Ke5-f6 Kb5-c6 b4-b3 Qe3xb3 Kf6-g7 Qb3-b7 Kg7-f7 Qb7-d7 Kf7-f6 Qd7-a7 Be7-f8 Qa7-f2+ Kf6-g7 b2-b4 Kg7-g8 Qf2-a2+ Kg8-g7 Qa2-a1+ Kg7-f7 b4-b5
26/53+ 00:34 321,634k 9,407k +21.77 Kb3-a4
26/53 00:34 323,715k 9,402k +21.77 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 Be7-f8 Bf4xd6 Bf8xd6 Qd3-b5+ Kd7-e6 Qb5-b6 Rc7-d7 a6-a7 Rd7xa7+ Qb6xa7 Bd6-e7 Ka4-b5 Be7-f6 Kb5xb4 Ke6-d5 Kb4-a4 Bf6-d4 Qa7-b7+ Kd5-e5 Qb7-f3 Ke5-e6 Qf3-e2+ Ke6-f6 Ka4-b5 Bd4-e5 Kb5-c6 Be5-b8 Qe2-h5 Kf6-g7 Qh5-f3 Kg7-g8 Qf3-d5+ Kg8-h7 Qd5-f7+ Kh7-h6 Qf7-f8+ Kh6-h5 Qf8xb8
26/56 00:35 329,360k 9,397k +21.77 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 Be7-f8 Bf4xd6 Bf8xd6 Qd3-b5+ Kd7-e6 Qb5-b6 Rc7-d7 a6-a7 Rd7xa7+ Qb6xa7 Bd6-e7 Ka4-b5 Be7-f6 Kb5xb4 Ke6-d5 Kb4-a4 Bf6-d4 Qa7-b7+ Kd5-e5 Qb7-f3 Ke5-e6 Qf3-e2+ Ke6-f6 Ka4-b5 Bd4-e5 Kb5-c6 Be5-b8 Qe2-h5 Kf6-g7 Qh5-f3 Kg7-g8 Qf3-d5+ Kg8-g7 Qd5-d4+ Kg7-g6 Qd4-e4+ Kg6-f6 Qe4-h4+ Kf6-g6 Qh4-e7 Kg6-h6 Qe7-f8+
27/56+ 01:04 567,128k 8,849k +31.48 Kb3-a4
27/56+ 01:15 664,431k 8,793k +M150 Kb3-a4
27/56- 01:15 667,920k 8,792k +M250 Kb3-a4 Nc8-d6
28/63 01:16 674,269k 8,794k +32.81 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 Be7-f8 Bf4xd6 Bf8xd6 Qd3-b5+ Kd7-e6 Qb5-b6 Rc7-d7 a6-a7 Rd7xa7+ Qb6xa7 Bd6-e7 Ka4-b5 Be7-d6 Qa7-a8 Ke6-f6 Kb5-a4 Kf6-g7 Qa8-b7+ Kg7-f6 Qb7-f3+ Kf6-e5 Qf3-e3+ Ke5-f5 Qe3-d3+ Kf5-e6 Qd3-e4+ Ke6-f6 Qe4-d4+ Kf6-e7 Ka4-b5 Ke7-d7 Qd4-d5 Kd7-e7 Kb5-c6 Bd6-h2 Qd5-e4+ Ke7-f6 Qe4-h4+ Kf6-f5 Qh4xh2 Kf5-g4 Qh2-e2+ Kg4-f4 Qe2-c4+ Kf4-f3 Qc4xb4
29/63+ 01:16 675,247k 8,793k +M150 Kb3-a4
29/63- 01:17 682,930k 8,794k +M250 Kb3-a4 Nc8-d6
30/63 02:01 1,040,216k 8,564k +M32 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 Be7-f8 Bf4xd6 Bf8xd6 Qd3-b5+ Kd7-e6 Qb5-b6 Rc7-d7 a6-a7 Rd7xa7+ Qb6xa7 Bd6-e7 Ka4-b5 Be7-d6 Qa7-e3+ Ke6-f6 Qe3-f3+ Kf6-e6 Kb5-c4 Bd6-e5 Kc4xb4 Be5-f6 Kb4-b5 Ke6-e5 b2-b4 Bf6-g5 Kb5-c4 Bg5-f4 b4-b5 Ke5-f5 b5-b6 Kf5-g5 b6-b7 Bf4-e5 Qf3-f7 Kg5-g4 Qf7-g8+ Kg4-f5 b7-b8Q Be5xb8 Qg8xb8 Kf5-g4 Kc4-d5 Kg4-f3 Qb8-h2 Kf3-e3 Qh2-g3+ Ke3-e2 Qg3-f4 Ke2-d3 Qf4-f3+ Kd3-d2 Kd5-c4
31/63 02:27 1,239,811k 8,386k +M29 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 Be7-f8 Bf4xd6 Bf8xd6 Qd3-b5+ Kd7-e6 Qb5-b6 Rc7-f7 a6-a7 Rf7-f8 Qb6-b7 Ke6-e5 Qb7-g7+ Ke5-f5 Qg7xf8+ Bd6xf8 a7-a8Q Bf8-d6 Qa8-f3+ Kf5-e5 Ka4-b5 Bd6-e7 Qf3-e3+ Ke5-d6 Kb5xb4 Kd6-d7+ Kb4-c4 Kd7-d6 Qe3-e4 Be7-f6 Qe4-f5 Bf6-e5 Qf5-g6+ Kd6-e7 Kc4-d5 Be5xb2 Qg6-d6+ Ke7-f7 Qd6-f4+ Kf7-e7 Qf4-b4+ Ke7-f7 Qb4xb2 Kf7-g6 Kd5-e6 Kg6-g5 Qb2-d4 Kg5-h6 Ke6-f6 Kh6-h7 Kf6-f7 Kh7-h6 Qd4-h4+
32/63 02:44 1,367,456k 8,299k +M27 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 Be7-f8 Bf4xd6 Bf8xd6 Qd3-b5+ Kd7-e6 Qb5-b6 Rc7-f7 a6-a7 Rf7-f8 Qb6-b7 Ke6-e5 Qb7-g7+ Ke5-f5 Qg7xf8+ Bd6xf8 a7-a8Q Bf8-d6 Qa8-f3+ Kf5-e5 Ka4-b5 Ke5-d4 Qf3-d1+ Kd4-e5 Kb5-c6 Bd6-f8 Qd1-d5+ Ke5-f6 Qd5-f3+ Kf6-e7 Qf3-e3+ Ke7-f6 Qe3-f4+ Kf6-e7 Qf4-e5+ Ke7-f7 Kc6-d7 Kf7-g8 Qe5-f5 Bf8-g7 Qf5-e6+ Kg8-h7 Kd7-e8 Bg7xb2 Ke8-f7 Bb2-g7 Qe6-g6+ Kh7-h8 Qg6xg7+
33/65 02:56 1,459,945k 8,284k +M27 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 Be7-f8 Bf4xd6 Bf8xd6 Qd3-b5+ Kd7-e6 Qb5-b6 Rc7-h7 Qb6-e3+ Bd6-e5 a6-a7 Rh7-h1 Qe3-b3+ Ke6-e7 Qb3xb4+ Ke7-f6 Qb4-f8+ Kf6-g5 a7-a8Q Rh1-a1+ Ka4-b5 Ra1xa8 Qf8xa8 Kg5-f4 Kb5-c4 Kf4-e3 Qa8-a3+ Ke3-e4 Qa3-e7 Ke4-f5 Kc4-d5 Be5xb2 Qe7-e3 Kf5-f6 Qe3-f2+ Kf6-g5 Qf2xb2 Kg5-f4 Qb2-f2+ Kf4-g5 Kd5-e6 Kg5-g4 Qf2-e3 Kg4-h5 Ke6-f5 Kh5-h4 Qe3-a3 Kh4-h5 Qa3-h3+
34/65 03:28 1,693,702k 8,107k +M26 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 Be7-f8 Bf4xd6 Bf8xd6 Qd3-b5+ Kd7-e6 Qb5-b6 Rc7-h7 Qb6-e3+ Bd6-e5 a6-a7 Rh7-h1 Qe3-b3+ Ke6-e7 Qb3xb4+ Ke7-f6 Qb4-f8+ Kf6-g5 a7-a8Q Rh1-a1+ Ka4-b5 Ra1xa8 Qf8xa8 Kg5-f4 Kb5-c4 Kf4-e3 Qa8-g2 Be5-d6 Kc4-d5 Bd6-c7 Qg2-h3+ Ke3-f4 Qh3-h2+ Kf4-f3 Qh2xc7 Kf3-e3 Qc7-g3+ Ke3-d2 Kd5-c4 Kd2-c2 Qg3-g2+ Kc2-c1 Kc4-b3 Kc1-d1 Qg2-f2 Kd1-c1 Qf2-c2+
35/67 04:27 2,159,256k 8,070k +M26 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 Be7-f8 Bf4xd6 Bf8xd6 Qd3-b5+ Kd7-e6 Qb5-b6 Rc7-h7 Qb6-e3+ Bd6-e5 a6-a7 Rh7-h1 Qe3-b3+ Ke6-e7 Qb3xb4+ Ke7-f6 Qb4-f8+ Kf6-g5 a7-a8Q Rh1-a1+ Ka4-b5 Ra1xa8 Qf8xa8 Kg5-f4 Kb5-c4 Kf4-e3 Qa8-g2 Be5-d6 Kc4-d5 Bd6-f8 Qg2-e4+ Ke3-d2 Qe4-f4+ Kd2-d3 Qf4xf8 Kd3-e3 Qf8-f5 Ke3-e2 Kd5-d4 Ke2-d2 Qf5-f2+ Kd2-c1 Kd4-c4 Kc1-b1 Kc4-b3 Kb1-c1 Qf2-c2+
36/67 06:34 3,157,109k 8,013k +M26 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 b4-b3 Ka4xb3 Rc7-a7 Bf4xd6 Be7xd6 Qd3-h7+ Bd6-e7 Qh7-e4 Be7-d6 Kb3-c4 Kd7-d8 Kc4-b5 Ra7-d7 Qe4-a8+ Kd8-e7 a6-a7 Bd6-e5 Qa8-e4 Rd7xa7 Qe4xe5+ Ke7-f7 Qe5-f4+ Kf7-g6 Qf4-e4+ Kg6-h5 Qe4-h1+ Kh5-g6 Qh1-g1+ Kg6-f6 Qg1xa7 Kf6-g6 Qa7-e3 Kg6-f5 Kb5-c6 Kf5-g4 Kc6-d5 Kg4-f5 Qe3-f3+ Kf5-g5 Kd5-e6 Kg5-h4 Qf3-g2 Kh4-h5 Ke6-f5 Kh5-h6 Qg2-g6+
37/67 07:07 3,411,021k 7,979k +M26 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 b4-b3 Ka4xb3 Rc7-a7 Bf4xd6 Be7xd6 Qd3-h7+ Bd6-e7 Qh7-e4 Be7-d6 Kb3-c4 Kd7-d8 Kc4-b5 Ra7-d7 Qe4-a8+ Kd8-e7 a6-a7 Bd6-e5 Qa8-e4 Rd7xa7 Qe4xe5+ Ke7-f7 Qe5-f4+ Kf7-g6 Qf4-e4+ Kg6-h5 Qe4-h1+ Kh5-g6 Qh1-g1+ Kg6-f6 Qg1xa7 Kf6-g6 Qa7-e3 Kg6-f5 Kb5-c6 Kf5-g4 Kc6-d5 Kg4-f5 Qe3-f3+ Kf5-g5 Kd5-e6 Kg5-h4 Qf3-g2 Kh4-h5 Ke6-f5 Kh5-h6 Qg2-g6+
38/67 09:07 4,351,276k 7,946k +M25 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 b4-b3 Ka4xb3 Rc7-a7 Bf4xd6 Be7xd6 Kb3-a4 Ra7-c7 Qd3-d5 Kd7-e7 Ka4-b5 Rc7-d7 Kb5-c6 Rd7-c7+ Kc6-b6 Rc7-c8 Qd5-g5+ Ke7-d7 Qg5-f5+ Kd7-d8 a6-a7 Bd6-h2 Qf5xc8+ Kd8xc8 Kb6-c6 Kc8-d8 a7-a8Q+ Kd8-e7 Kc6-d5 Ke7-f7 Qa8-c6 Bh2-g1 Qc6-e6+ Kf7-g7 Kd5-e5 Bg1-e3 Ke5-f5 Be3-g5 Qe6-g6+ Kg7-h8 Qg6xg5 Kh8-h7 Kf5-f6 Kh7-h8 Qg5-g7+
39/67 11:35 5,452,147k 7,836k +M25 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 b4-b3 Ka4xb3 Rc7-a7 Bf4xd6 Be7xd6 Kb3-a4 Ra7-c7 Qd3-d5 Kd7-e7 Ka4-b5 Rc7-d7 Kb5-c6 Rd7-c7+ Kc6-b6 Rc7-c8 Qd5-g5+ Ke7-d7 Qg5-f5+ Kd7-d8 a6-a7 Bd6-h2 Qf5xc8+ Kd8xc8 Kb6-c6 Kc8-d8 a7-a8Q+ Kd8-e7 Kc6-d5 Ke7-f7 Qa8-c6 Bh2-g1 Qc6-e6+ Kf7-g7 Kd5-e5 Bg1-e3 Ke5-f5 Be3-g5 Qe6-g6+ Kg7-h8 Qg6xg5 Kh8-h7 Kf5-f6 Kh7-h8 Qg5-g7+
40/67 11:59 5,629,088k 7,825k +M25 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 b4-b3 Ka4xb3 Rc7-a7 Bf4xd6 Be7xd6 Kb3-a4 Ra7-c7 Qd3-d5 Kd7-e7 Ka4-b5 Rc7-d7 Kb5-c6 Rd7-c7+ Kc6-b6 Rc7-c8 Qd5-g5+ Ke7-d7 Qg5-f5+ Kd7-d8 a6-a7 Bd6-h2 Qf5xc8+ Kd8xc8 Kb6-c6 Kc8-d8 a7-a8Q+ Kd8-e7 Kc6-d5 Ke7-f7 Qa8-c6 Bh2-g1 Qc6-e6+ Kf7-g7 Kd5-e5 Bg1-e3 Ke5-f5 Be3-g5 Qe6-g6+ Kg7-h8 Qg6xg5 Kh8-h7 Kf5-f6 Kh7-h8 Qg5-g7+
41/67 19:28 9,370,993k 8,022k +M24 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 b4-b3 Bf4xd6 Be7xd6 Qd3-d4 Rc7-c6 a6-a7 Rc6-a6+ Ka4-b5 Ra6-a1 Qd4-g4+ Kd7-c7 Qg4-g7+ Kc7-c8 Qg7-g8+ Kc8-d7 a7-a8Q Ra1xa8 Qg8xa8 Kd7-e6 Kb5-c6 Bd6-f4 Qa8-e8+ Ke6-f6 Kc6-d5 Kf6-g5 Qe8-g8+ Kg5-f5 Qg8-f8+ Kf5-g4 Kd5-e4 Bf4-c1 Qf8-f5+ Kg4-g3 Qf5-f3+ Kg3-h2 Qf3-f2+ Kh2-h3 Ke4-f3 Bc1-f4 Qf2-g2+ Kh3-h4 Qg2-g4+
42/67 21:16 10,217,272k 8,006k +M24 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 b4-b3 Bf4xd6 Be7xd6 Qd3-d4 Rc7-c6 a6-a7 Rc6-a6+ Ka4-b5 Ra6-a1 Qd4-g4+ Kd7-c7 Qg4-g7+ Kc7-c8 Qg7-g8+ Kc8-d7 a7-a8Q Ra1xa8 Qg8xa8 Kd7-e6 Kb5-c6 Bd6-f4 Qa8-e8+ Ke6-f6 Kc6-d5 Kf6-g5 Qe8-g8+ Kg5-f5 Qg8-f8+ Kf5-g4 Kd5-e4 Bf4-c1 Qf8-f5+ Kg4-g3 Qf5-f3+ Kg3-h2 Qf3-f2+ Kh2-h3 Ke4-f3 Bc1-f4 Qf2-g2+ Kh3-h4 Qg2-g4+
43/67 22:26 10,781,518k 8,007k +M24 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 b4-b3 Bf4xd6 Be7xd6 Qd3-d4 Rc7-c6 a6-a7 Rc6-a6+ Ka4-b5 Ra6-a1 Qd4-g4+ Kd7-c7 Qg4-g7+ Kc7-c8 Qg7-g8+ Kc8-d7 a7-a8Q Ra1xa8 Qg8xa8 Kd7-e6 Kb5-c6 Bd6-f4 Qa8-e8+ Ke6-f6 Kc6-d5 Kf6-g5 Qe8-g8+ Kg5-f5 Qg8-f8+ Kf5-g4 Kd5-e4 Bf4-c1 Qf8-f5+ Kg4-g3 Qf5-f3+ Kg3-h2 Qf3-f2+ Kh2-h3 Ke4-f3 Bc1-f4 Qf2-g2+ Kh3-h4 Qg2-g4+
44/67 24:51 11,920,545k 7,990k +M24 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 b4-b3 Bf4xd6 Be7xd6 Qd3-d4 Rc7-c6 a6-a7 Rc6-a6+ Ka4-b5 Ra6-a1 Qd4-g4+ Kd7-c7 Qg4-g7+ Kc7-c8 Qg7-g8+ Kc8-d7 a7-a8Q Ra1xa8 Qg8xa8 Kd7-e6 Kb5-c6 Bd6-f4 Qa8-e8+ Ke6-f6 Kc6-d5 Kf6-g5 Qe8-g8+ Kg5-f5 Qg8-f8+ Kf5-g4 Kd5-e4 Bf4-c1 Qf8-f5+ Kg4-g3 Qf5-f3+ Kg3-h2 Qf3-f2+ Kh2-h3 Ke4-f3 Bc1-f4 Qf2-g2+ Kh3-h4 Qg2-g4+
45/67 30:55 14,773,469k 7,960k +M24 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 b4-b3 Bf4xd6 Be7xd6 Qd3-d4 Rc7-c6 a6-a7 Rc6-a6+ Ka4-b5 Ra6-a1 Qd4-g4+ Kd7-c7 Qg4-g7+ Kc7-c8 Qg7-g8+ Kc8-d7 a7-a8Q Ra1xa8 Qg8xa8 Kd7-e6 Kb5-c6 Bd6-f4 Qa8-e8+ Ke6-f6 Kc6-d5 Kf6-g5 Qe8-g8+ Kg5-f5 Qg8-f8+ Kf5-g4 Kd5-e4 Bf4-c1 Qf8-f5+ Kg4-g3 Qf5-f3+ Kg3-h2 Qf3-f2+ Kh2-h3 Ke4-f3 Bc1-f4 Qf2-g2+ Kh3-h4 Qg2-g4+
46/69 33:08 15,835,205k 7,964k +M24 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 b4-b3 Bf4xd6 Be7xd6 Qd3-d4 Rc7-c6 a6-a7 Rc6-a6+ Ka4-b5 Ra6-a1 Qd4-g4+ Kd7-c7 Qg4-g7+ Kc7-c8 Qg7-g8+ Kc8-d7 a7-a8Q Ra1xa8 Qg8xa8 Kd7-e6 Kb5-c6 Bd6-f4 Qa8-e8+ Ke6-f6 Kc6-d5 Kf6-g5 Qe8-g8+ Kg5-f5 Qg8-f8+ Kf5-g4 Kd5-e4 Bf4-c1 Qf8-f5+ Kg4-g3 Qf5-f3+ Kg3-h2 Qf3-f2+ Kh2-h3 Ke4-f3 Bc1-f4 Qf2-g2+ Kh3-h4 Qg2-g4+
47/75 43:31 20,958,662k 8,024k +M24 Kb3-a4 Nc8-d6 Be3-f4 Kc6-d7 a5-a6 b4-b3 Bf4xd6 Be7xd6 Qd3-d4 Rc7-c6 a6-a7 Rc6-a6+ Ka4-b5 Ra6-a1 Qd4-g4+ Kd7-c7 Qg4-g7+ Kc7-c8 Qg7-g8+ Kc8-d7 a7-a8Q Ra1xa8 Qg8xa8 Kd7-e6 Kb5-c6 Bd6-f4 Qa8-e8+ Ke6-f6 Kc6-d5 Kf6-g5 Qe8-g8+ Kg5-f5 Qg8-f8+ Kf5-g4 Kd5-e4 Bf4-c1 Qf8-f5+ Kg4-g3 Qf5-f3+ Kg3-h2 Qf3-f2+ Kh2-h3 Ke4-f3 Bc1-f4 Qf2-g2+ Kh3-h4 Qg2-g4+

[Uri Blass]

update of the hard test positions to compare chess engines

Thanks for collecting, but how should these positions be used for any comparison between more then 2 engines or settings of one?
With what a hardware- time?
Having seen your own problems with DsTM, which one results to be counted "solved"?
SlowChess would probably sparkle as for getting any output with somewhat "correct" DsTM but take very long for the (probably) best one lines, Huntsman being probably only second best as for #-output at all but have at least a chance to get correct DsTM in the easier ones in about 10 minutes or more. The harder ones even Huntsman would have to have >30 minutes for, started with empty hash.
Are specialised mate search- programs to be tested too at all?
With which one settings? Finding best params for Chest e.g. would help for some of the postions, not for others, anyhow it was a big difference as for this one engine, same with Gustav.

Huntsman has mate search checked by default and SlowChess uses it in game playing too, but e.g. Houdini4? DTM to be set in option or not? MateFish (other one program from Jörg Oster) needs any DTM to be set to work at all, but for that you have to use a GUI like Arena or console- mode allowing to run mate in x- mode,
regards

For me the interesting question is what it is that makes these positions so tough for engines.
High number of legal moves, in general? Tactics? Promotions? (which most likely leads to problem #1)
Bad move ordering for this type of problems?

The choice of the positions was in order to make them hard.
One condition for choosing the position is that both players and the kibitzer did not see a mate score during the game.
second condition in order not to make them too hard is that later at least the kibitzer or one of the players could see a mate score.

In theory we may get impossible to solve problem if the position is a draw and immediately after a blunder one engine see a mate score but so far in the analysis of the first games it never happened.

[peter]

For me the interesting question is what it is that makes these positions so tough for engines.
High number of legal moves, in general? Tactics? Promotions? (which most likely leads to problem #1)
Bad move ordering for this type of problems?

There isn't any type of problems arising in game playing of course, "type" of "such" postions depending on the game leading to them. As many games as can be searched for DTM- positions, as many as that there are "such" positions arising sooner or later.
Difference as for TCEC- games is only the hardware- time used for game playing there, so you see DTM- outputs arising sooner.

And to let engines ponder started with empty hash is waste of hardware- time with "such" positions anyhow too, you won't be able to compare such results with the outputs of engines playing these games, cause those have much time to fill their hash with pondering step by step nearer and nearer to mate in game playing too, on the other hand, engines at game playing don't have best settings for search of DTM, e.g. NNUE- engines most of the time get longer DTM- outputs sooner without usage of NNUE- eval, Syzaygys (or other tbs without DTM- info stored) are most of times better switched off too.

Forward- Backward solves "such" positions much faster with all engines you try, at least you can rely much faster on DTM for "solution", the point of "finding" the (provable?) DTM depends simply on starting- position some nearer or some further away from mate.
Or to ask shorter again: how to know for such long DsTM, "solution" found is the very right one without giving Forward- Backward a try too?

Just my two cents regards

[Chessqueen]

[quote="Uri Blass" post_id=935943 time=1665633842 user_id=192]
next 2 positions in the suite

2B5/8/3p1n2/5K2/2P4k/8/2R5/b7 w - - 0 1 bm Rc1 dm 24
8/1R6/3pk3/p7/8/R7/P7/1KB2q2 w - - 0 1 bm Re3+ dm 38

analysis with slowchess after going forward and backward not from clear hash

FEN: 2B5/8/3p1n2/5K2/2P4k/8/2R5/b7 w - - 0 1

Slow64-avx2 [001]:

39/48 00:02 16,334k 6,980k +M24 Rc2-c1 Ba1-b2 Rc1-d1 Nf6-e8 Rd1-d3 Ne8-f6 Rd3xd6 Nf6-g8 Bc8-d7 Ng8-e7+ Kf5-e6 Ne7-g8 c4-c5 Bb2-c3 Ke6-f7 Bc3-a5 Rd6-g6 Ng8-h6+ Rg6xh6+ Kh4-g5 Rh6-f6 Ba5-d8 c5-c6 Bd8-c7 Kf7-e6 Bc7-b8 Rf6-f7 Kg5-g4 Ke6-d5+ Kg4-g5 Kd5-e4 Kg5-g6 Bd7-e6 Bb8-h2 c6-c7 Bh2xc7 Rf7xc7 Kg6-g5 Ke4-e5 Kg5-g6 Rc7-c3 Kg6-g7 Ke5-f5 Kg7-h6 Kf5-f6 Kh6-h7 Rc3-h3+

Uri which version of Slowchess are you using and how many cores ?

[Uri Blass]

next 2 positions in the suite

2B5/8/3p1n2/5K2/2P4k/8/2R5/b7 w - - 0 1 bm Rc1 dm 24
8/1R6/3pk3/p7/8/R7/P7/1KB2q2 w - - 0 1 bm Re3+ dm 38

analysis with slowchess after going forward and backward not from clear hash

FEN: 2B5/8/3p1n2/5K2/2P4k/8/2R5/b7 w - - 0 1

Slow64-avx2 [001]:

39/48 00:02 16,334k 6,980k +M24 Rc2-c1 Ba1-b2 Rc1-d1 Nf6-e8 Rd1-d3 Ne8-f6 Rd3xd6 Nf6-g8 Bc8-d7 Ng8-e7+ Kf5-e6 Ne7-g8 c4-c5 Bb2-c3 Ke6-f7 Bc3-a5 Rd6-g6 Ng8-h6+ Rg6xh6+ Kh4-g5 Rh6-f6 Ba5-d8 c5-c6 Bd8-c7 Kf7-e6 Bc7-b8 Rf6-f7 Kg5-g4 Ke6-d5+ Kg4-g5 Kd5-e4 Kg5-g6 Bd7-e6 Bb8-h2 c6-c7 Bh2xc7 Rf7xc7 Kg6-g5 Ke4-e5 Kg5-g6 Rc7-c3 Kg6-g7 Ke5-f5 Kg7-h6 Kf5-f6 Kh6-h7 Rc3-h3+

Uri which version of Slowchess are you using and how many cores ?

I use slowchessblitz2.9 with 7 cores.