Extremely long forced mate from S11 Stockfish vs Chiron match

[AndrewGrant]

The following position comes from the final adjudicated position of one of the Stockfish vs Chiron matches in S11 for TCEC.

[d]2q3k1/1p3prb/p1p2b2/P1P1nP2/1P2R3/7Q/2B2P2/2B2K1R w - - 1 50

Here Ethereal resolves the line, with the following output, after nearly 24 hours of search, and 4 TRILLION nodes searched.

info depth 46 seldepth 74 score mate 32 time 92587321 nodes 4049199386496 nps 43733000 tbhits 0 hashfull 1 pv e4d4 e5g6 d4d6 f6e5 f5g6 c8h3 h1h3 g7g6 d6d7 g6g1 f1g1 h7c2 h3e3 e5a1 d7b7 g8f8 b7b8 f8g7 b8b6 g7g6 b6c6 g6f5 e3f3 f5e4 f3f4 e4e5 f4f7 c2b3 f7e7 e5f5 c6a6 a1f6 e7e8 f6e5 e8e5 f5e5 a6d6 b3c2 a5a6 e5f5 a6a7 c2e4 d6d8 f5f6 a7a8q e4a8 d8a8 f6e7 c5c6 e7d6 a8a6 d6e6 c6c7 e6d7 c1f4 d7c8 a6c6 c8d7 c7c8q d7e7 c8e6 e7d8 c6c8

Full UCI output can be found here : https://pastebin.com/raw/8Rv7xHFE

I'm curious if other engines will take as long, or even find the mate.

[Uri Blass]

The following position comes from the final adjudicated position of one of the Stockfish vs Chiron matches in S11 for TCEC.

[d]2q3k1/1p3prb/p1p2b2/P1P1nP2/1P2R3/7Q/2B2P2/2B2K1R w - - 1 50

Here Ethereal resolves the line, with the following output, after nearly 24 hours of search, and 4 TRILLION nodes searched.

info depth 46 seldepth 74 score mate 32 time 92587321 nodes 4049199386496 nps 43733000 tbhits 0 hashfull 1 pv e4d4 e5g6 d4d6 f6e5 f5g6 c8h3 h1h3 g7g6 d6d7 g6g1 f1g1 h7c2 h3e3 e5a1 d7b7 g8f8 b7b8 f8g7 b8b6 g7g6 b6c6 g6f5 e3f3 f5e4 f3f4 e4e5 f4f7 c2b3 f7e7 e5f5 c6a6 a1f6 e7e8 f6e5 e8e5 f5e5 a6d6 b3c2 a5a6 e5f5 a6a7 c2e4 d6d8 f5f6 a7a8q e4a8 d8a8 f6e7 c5c6 e7d6 a8a6 d6e6 c6c7 e6d7 c1f4 d7c8 a6c6 c8d7 c7c8q d7e7 c8e6 e7d8 c6c8

Full UCI output can be found here : https://pastebin.com/raw/8Rv7xHFE

I'm curious if other engines will take as long, or even find the mate.

stockfish can find faster mate with less nodes.

[d]2q3k1/1p3prb/p1p2b2/P1P1nP2/1P2R3/7Q/2B2P2/2B2K1R w - - 1 50


Stockfish_18071408_x64_modern:
1/1 00:00 318 318k +4.63 50.Bf4
2/2 00:00 410 410k +6.34 50.Rd4 b6
3/3 00:00 527 264k +5.97 50.Rd4 b6 51.axb6
4/4 00:00 602 301k +5.97 50.Rd4 b6 51.axb6 a5
5/5 00:00 862 431k +6.36 50.Rd4 b6 51.Rd6 bxa5 52.Rxf6
6/6 00:00 1k 557k +6.29 50.Rd4 b6 51.Rd6 Nc4 52.Rxf6 bxc5
7/7 00:00 2k 909k +6.47 50.Rd4 b6 51.Rd6 bxa5 52.Rxf6 Ng4 53.Rd6
8/8 00:00 5k 1,173k +6.70 50.Rd4 Kf8 51.Qh6 Nd7 52.Rxd7 Be5 53.Rd3 f6
9/11 00:00 14k 1,569k +6.76 50.Rd4 Nf3 51.Rd6 Nd4 52.Be4 Be5 53.Rh6 Qd8 54.Rxh7
10/16 00:00 59k 2,020k +7.16 50.Rd4 Nf3 51.Rg4 Rxg4 52.Qxg4+ Kh8 53.Qxf3 Kg7 54.Bh6+ Kh8 55.Rg1 Qd7 56.Be3
11/18 00:00 95k 2,113k +7.41 50.Rd4 Nf3 51.Rg4 Rxg4 52.Qxg4+ Kf8 53.Rxh7 Ne5 54.Bh6+ Ke7 55.Qd4 Qd7 56.Qxd7+ Kxd7 57.Be3
12/23 00:00 189k 2,452k +7.52 50.Rd4 Kf8 51.Bh6 Nd3 52.Qxd3 Bxf5 53.Bxg7+ Kxg7 54.Qg3+ Kf8 55.Bxf5 Qxf5 56.Rd6 Ke7
13/21 00:00 475k 3,187k +8.80 50.Rd4 Kf8 51.Bh6 Qe8 52.Bxg7+ Bxg7 53.Qxh7 Nf3 54.Rf4 Ng5 55.Qh5 f6 56.Kg2 Qxh5 57.Rxh5
14/19 00:00 584k 3,319k +8.62 50.Rd4 Ng6 51.Rd6 Be7 52.Bh6 Nf4 53.Qc3 f6 54.Qc4+ Nd5 55.Bxg7 Bxd6 56.Bxf6 Bxf5 57.Rh8+ Kf7 58.Rxc8
15/21 00:00 804k 3,420k +8.59 50.Rd4 Ng6 51.Rd6 Be5 52.Bh6 Nf8 53.Bxg7 Bxg7 54.Qg4 Bxf5 55.Bxf5 Qc7 56.Rdh6 Ng6 57.Bxg6 fxg6 58.Qxg6 Kf8 59.Qd6+ Qxd6 60.Rxd6
16/22 00:00 941k 3,474k +8.67 50.Rd4 Ng6 51.Rd6 Be5 52.Bh6 Nf8 53.Bxg7 Bxg7 54.Qg4 Bg6 55.f3 Qe8 56.fxg6 Nxg6 57.Bxg6 fxg6 58.Rxg6 Qf7 59.Qc8+ Qf8 60.Qxf8+ Kxf8 61.Kf2
17/32 00:00 2,089k 3,987k +9.19 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Rxb7 f6 57.Rb6 Bf5 58.Rh4 Bd3 59.Rxc6 Bb5 60.Rc8+ Kf7 61.Bh6 f5
18/35 00:00 2,956k 4,180k +9.44 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Rxb7 f6 57.Rb6 Be4 58.Rxa6 Kf7 59.Rh4 f5 60.Ra7+ Ke6 61.Be3 Kd5 62.f4 Bf6 63.Rh6
19/34 00:00 4,119k 4,317k +9.50 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Rxb7 Kg7 57.Ra7 Ba4 58.Rxa6 Kg6 59.Bh6 f6 60.Ra8 Bc2 61.Rg8+ Kf5 62.Rg7 Be4 63.Be3
20/39 00:02 9,265k 4,540k +9.94 50.Rd4 Nf3 51.Rg4 Rxg4 52.Qxg4+ Kh8 53.Qxf3 Qg8 54.Qh3 Qg7 55.Qh2 Be5 56.f6 Bxh2 57.fxg7+ Kxg7 58.Bxh7 Kxh7 59.Rxh2+ Kg7 60.Rh6 f6 61.Be3 f5 62.Rd6
21/35 00:02 11,049k 4,570k +10.14 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Re3 Bf6 57.Rxb7 Kg7 58.Rg3+ Bg6 59.Ra7 Bd4 60.Rxa6 Be5 61.Rh3 Kf6 62.Rxc6+ Kg7
22/35+ 00:03 15,186k 4,600k +10.40 50.Rd4
22/40 00:03 17,265k 4,610k +10.44 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Re3 Ba1 57.Rxb7 Kg7 58.Rb6 f6 59.Rxc6 Bd4 60.Rg3+ Kf7 61.Rxa6 Be5 62.Re3 Bd4 63.Rf3 Kg6 64.Rg3+ Kf5 65.Be3
23/33+ 00:04 20,512k 4,587k +10.52 50.Rd4
23/33+ 00:04 22,255k 4,603k +10.59 50.Rd4
23/37 00:05 23,377k 4,616k +10.63 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Re3 Ba1 57.Rxb7 Bd4 58.Rg3+ Bg6 59.Ra7 Be5 60.Rg4 Kf8 61.Rxa6 Bd3 62.Ra7 Bg6 63.Bf4 Bc3 64.Rc7 Kg8 65.Bh6 Kh7 66.Bc1 Kg7 67.Rxc6 Kf8
24/40+ 00:05 26,880k 4,631k +10.71 50.Rd4
24/40+ 00:06 28,974k 4,655k +10.78 50.Rd4
24/40+ 00:06 32,294k 4,657k +10.90 50.Rd4
24/41 00:07 34,581k 4,657k +10.95 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Re3 Ba1 57.Rxb7 Kg7 58.Rb6 f6 59.Rxc6 Kg6 60.Rxa6 Kf5 61.Ra3 Be5 62.Be3 Be4 63.b5 Kg6 64.f4 Bb8 65.Bd4 Bxf4 66.Rxf6+ Kg5 67.Rf8 Bc7
25/49+ 00:08 41,749k 4,691k +11.03 50.Rd4
25/49+ 00:09 42,851k 4,692k +11.10 50.Rd4
25/49+ 00:09 45,705k 4,700k +11.22 50.Rd4
25/49 00:10 51,064k 4,704k +11.32 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Re3 Ba1 57.Rxb7 Bf5 58.Rg3+ Bg6 59.Bf4 Kg7 60.Rb6 Kf6 61.Rxc6+ Kf5 62.Bd2 Be5 63.Rg5+ Ke4 64.Rxa6 Bg7 65.b5 Bf8 66.c6 Be7 67.c7 Bxg5 68.c8Q Bxd2 69.Ra8
26/47+ 00:12 60,269k 4,718k +11.39 50.Rd4
26/47+ 00:14 67,021k 4,731k +11.47 50.Rd4
26/47 00:15 72,589k 4,741k +11.52 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Re3 Ba1 57.Rxb7 Bf5 58.Rg3+ Bg6 59.Bf4 Kg7 60.Rb6 Kf6 61.Rxc6+ Kf5 62.Bd2 Be5 63.Rg5+ Ke4 64.Rxa6 Bh7 65.Rh6 Bg6 66.Rh3 Bb8 67.Rh8 Be5 68.Re8 Kd3 69.Rgxe5 Kxd2 70.Re3
27/39+ 00:16 80,525k 4,747k +11.60 50.Rd4
27/43+ 00:17 84,875k 4,747k +11.67 50.Rd4
27/43+ 00:18 88,629k 4,748k +11.78 50.Rd4
27/45 00:21 101,260k 4,739k +11.92 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Re3 Ba1 57.Rxb7 Bf5 58.Rg3+ Bg6 59.Bf4 Kg7 60.Rb6 Kf6 61.Rxc6+ Kf5 62.Bd2 f6 63.Bc3 Bxc3 64.Rxc3 Bf7 65.Rf3+ Ke5 66.Rfxf6 Bh5 67.Rcd6 Ke4 68.Kg2 Ke5 69.Rxa6 Kd4 70.Rab6
28/47+ 00:23 113,172k 4,738k +12.00 50.Rd4
28/47+ 00:24 117,730k 4,736k +12.07 50.Rd4
28/47+ 00:26 125,449k 4,737k +12.18 50.Rd4
28/47+ 00:27 129,174k 4,731k +12.34 50.Rd4
28/47+ 00:29 140,206k 4,736k +12.56 50.Rd4
28/47+ 00:31 148,768k 4,732k +12.85 50.Rd4
28/47+ 00:35 168,056k 4,735k +13.23 50.Rd4
28/47+ 00:40 190,053k 4,738k +13.73 50.Rd4
28/47+ 00:48 230,711k 4,752k +14.38 50.Rd4
28/47 01:00 288,278k 4,760k +14.73 50.Rd4 Nc4 51.Rxc4 Qd7 52.Bh6 Bxf5 53.Qxf5 Qxf5 54.Bxf5 Bg5 55.Bxg7 Kxg7 56.Bc8 Kg6 57.Bxb7 Bd8 58.Bxc6 Kf5 59.Bb7 Ke6 60.Bxa6 Bc7 61.Bb7 Kd7 62.Rh7 Ke6 63.Bc6 Kf6
29/36- 01:01 290,591k 4,760k +14.56 50.Rd4 Nd7
29/37+ 01:02 297,866k 4,761k +14.73 50.Rd4
29/37+ 01:04 308,177k 4,765k +14.85 50.Rd4
29/37+ 01:06 317,254k 4,769k +15.00 50.Rd4
29/43+ 01:08 326,664k 4,773k +15.22 50.Rd4
29/43+ 01:14 356,372k 4,764k +15.51 50.Rd4
29/43+ 01:27 419,237k 4,781k +15.90 50.Rd4
29/43+ 01:38 470,625k 4,789k +16.40 50.Rd4
29/43+ 02:01 586,064k 4,821k +17.04 50.Rd4
29/45+ 02:22 686,468k 4,824k +17.87 50.Rd4
29/46+ 03:04 898,746k 4,861k +18.92 50.Rd4
29/50 04:26 1,305,619k 4,901k +20.13 50.Rd4 Nc4 51.Rxc4 Qd7 52.Bh6 Bxf5 53.Qxf5 Qxf5 54.Bxf5 Bg5 55.Bxg7 Kxg7 56.Bc8 f5 57.Bxb7 Kf7 58.Bxa6 Ke6 59.Bb7 Kd5 60.a6 Kxc4 61.a7 Kb3 62.a8Q Bd2 63.Bxc6 Kb2 64.b5 Bc1 65.b6 Kb3 66.Rh3+ Kb2 67.Qa3+ Kb1 68.Qd3+ Kb2 69.Qxf5
30/43- 04:27 1,313,378k 4,902k +18.92 50.Rd4 Ng6
30/46+ 04:39 1,371,162k 4,904k +20.13 50.Rd4
30/46+ 04:50 1,426,065k 4,908k +20.24 50.Rd4
30/46- 04:54 1,446,072k 4,908k +19.85 50.Rd4 Nc4
30/46- 04:55 1,449,824k 4,908k +19.62 50.Rd4 Nc4
30/46- 04:56 1,457,690k 4,908k +19.32 50.Rd4 Nc4
30/46+ 04:58 1,464,237k 4,909k +19.60 50.Rd4
30/46+ 05:00 1,475,193k 4,910k +20.10 50.Rd4
30/50- 05:39 1,670,700k 4,927k +18.94 50.Rd4 Qe8
30/50+ 05:41 1,682,310k 4,928k +19.85 50.Rd4
30/50+ 06:09 1,825,299k 4,941k +20.90 50.Rd4
30/50+ 07:30 2,243,060k 4,978k +22.23 50.Rd4
30/53+ 10:19 3,119,071k 5,038k +23.92 50.Rd4
30/53 12:19 3,748,433k 5,069k +25.17 50.Rd4 Nc4 51.Rxc4 Qd7 52.Bh6 Bxf5 53.Qxf5 Qxf5 54.Bxf5 Bg5 55.Bxg7 Kxg7 56.Bc8 Bf6 57.Bxb7 Be5 58.Bxa6 Kf6 59.Bb7 Ke6 60.Bxc6 Bb8 61.a6 f6 62.Bb7 f5 63.b5 f4 64.b6 f3 65.Rh7 Kf5 66.a7 Be5 67.a8Q Bf6 68.Bxf3 Be5 69.Qe4+ Kf6
31/48- 12:20 3,753,884k 5,069k +24.15 50.Rd4 Ng6
31/49+ 12:37 3,843,840k 5,072k +25.17 50.Rd4
31/50- 12:52 3,918,606k 5,074k +23.80 50.Rd4 Nc4
31/52+ 12:53 3,926,185k 5,074k +24.67 50.Rd4
31/52+ 13:00 3,959,776k 5,075k +24.89 50.Rd4
31/52+ 13:18 4,055,105k 5,078k +25.18 50.Rd4
31/52+ 13:54 4,240,374k 5,084k +25.57 50.Rd4
31/52+ 14:17 4,364,479k 5,091k +26.07 50.Rd4
31/52+ 16:19 5,007,006k 5,113k +26.71 50.Rd4
31/52+ 17:39 5,428,282k 5,126k +27.54 50.Rd4
31/52+ 19:47 6,055,286k 5,099k +28.59 50.Rd4
31/52+ 21:51 6,708,399k 5,116k +29.92 50.Rd4
31/52+ 23:41 7,288,099k 5,128k +31.61 50.Rd4
31/52+ 25:40 7,915,316k 5,139k +33.74 50.Rd4
31/52+ 27:27 8,475,313k 5,145k +36.42 50.Rd4
31/52+ 28:29 8,801,814k 5,149k +39.78 50.Rd4
31/52+ 29:09 9,009,881k 5,151k +44.01 50.Rd4
31/52+ 29:49 9,225,664k 5,154k +49.32 50.Rd4
31/52+ 31:58 9,904,964k 5,164k +55.97 50.Rd4
31/58- 34:31 10,712,323k 5,172k +23.70 50.Rd4 Qe8
31/58+ 34:32 10,718,393k 5,172k +44.00 50.Rd4
31/58+ 34:36 10,741,205k 5,172k +57.07 50.Rd4
31/58 35:50 11,133,935k 5,177k +70.17 50.Rd4 Qe8 51.Bh6 Bg6 52.Rd6 Rh7 53.Rxf6 Qd7 54.fxg6 Qxh3+ 55.Rxh3 Rxh6 56.gxf7+ Nxf7 57.Rhxh6 Nxh6 58.Rxh6 Kf7 59.Rh7+ Ke6 60.Rxb7 Kd5 61.Rb6 Ke5 62.Rxa6 Kd4 63.Rxc6 Kc3 64.Be4 Kd4 65.Rb6 Ke5 66.a6 Kxe4 67.a7 Ke5 68.a8Q Kf4 69.Qa7 Ke5 70.c6 Ke4 71.c7 Kd4 72.Rc6+ Ke5 73.c8Q
32/46- 35:51 11,136,930k 5,177k +59.81 50.Rd4 Ng6
32/46+ 36:14 11,265,547k 5,180k +70.17 50.Rd4
32/46- 36:26 11,328,008k 5,180k +61.59 50.Rd4 Kf8
32/46- 36:32 11,359,902k 5,181k +60.80 50.Rd4 Nf3
32/46+ 36:37 11,383,290k 5,181k +65.40 50.Rd4
32/46+ 36:40 11,402,846k 5,181k +65.85 50.Rd4
32/46+ 36:46 11,435,390k 5,182k +66.23 50.Rd4
32/46+ 36:48 11,444,695k 5,182k +66.76 50.Rd4
32/46+ 36:50 11,454,530k 5,182k +67.43 50.Rd4
32/46+ 36:53 11,470,011k 5,182k +68.25 50.Rd4
32/46+ 36:56 11,488,568k 5,182k +69.30 50.Rd4
32/46+ 37:22 11,622,531k 5,183k +70.64 50.Rd4
32/50+ 37:51 11,778,118k 5,185k +72.32 50.Rd4
32/50+ 38:29 11,985,192k 5,188k +74.45 50.Rd4
32/54- 38:31 11,993,979k 5,189k +59.85 50.Rd4 Ng6
32/54+ 38:37 12,022,801k 5,189k +68.85 50.Rd4
32/54+ 38:44 12,060,100k 5,189k +73.08 50.Rd4
32/58+ 39:23 12,267,723k 5,191k +78.39 50.Rd4
32/58+ 39:54 12,432,704k 5,193k +86.93 50.Rd4
32/58+ 40:02 12,476,687k 5,193k +132.70 50.Rd4
32/58 43:10 13,474,736k 5,202k +M31 50.Rd4 Qe8 51.Bh6 Bxf5 52.Bxf5 Rg6 53.Rd6 Rxh6 54.Qxh6 Bg7 55.Qh4 Nf3 56.Rd8 Nxh4 57.Rxe8+ Bf8 58.Rxh4 Kg7 59.Rh7+ Kf6 60.Rxf8 Kxf5 61.Rfxf7+ Ke6 62.Rxb7 Ke5 63.Rh5+ Ke4 64.Rh6 Kd5 65.Rd6+ Ke4 66.Rxc6 Kd3 67.Rxa6 Kd2 68.Rab6 Kc1 69.a6 Kb1 70.a7 Kb2 71.a8Q Kc2 72.c6 Kc3 73.c7 Kb2 74.c8Q
33/56 44:59 14,026,543k 5,197k +M25 50.Rd4 Qe8 51.Bh6 Nf3 52.Bxg7 Bxg7 53.Qxh7+ Kf8 54.Rd6 Qe7 55.f6 Bxf6 56.Qh6+ Bg7 57.Qh3 Qe6 58.Rxe6 Ng5 59.Re8+ Kxe8 60.Qc8+ Ke7 61.Qc7+ Ke8 62.Qb8+ Ke7 63.Qd6+ Ke8 64.Bf5 Ne6 65.Bxe6 fxe6 66.Qxe6+ Kf8 67.Qf5+ Ke8 68.Qg6+ Ke7 69.Qxg7+ Ke6 70.Qg4+ Kf6 71.Rh6+ Kf7 72.Qf5+ Ke7 73.Rh7+ Kd8 74.Qd7+

[Uri Blass]

with more time stockfish see mate in 19

34/54 48:57 15,251,119k 5,192k +M19 50.Rd4 Qe8 51.Bh6 Nf3 52.Bxg7 Bxg7 53.Qxh7+ Kf8 54.Rd6 Qe7 55.f6 Bxf6 56.Qh6+ Bg7 57.Qh3 Qe1+ 58.Kg2 Qe8 59.Qxf3 Qe5 60.Rd8+ Ke7 61.Rhd1 Qg5+ 62.Kf1 Bd4 63.R1xd4 Qc1+ 64.Rd1 f5 65.Qxf5 Qxd1+ 66.Rxd1 Ke8 67.Qf6 b6 68.Bg6+
35/42 51:25 16,020,687k 5,192k +M19 50.Rd4 Qc7 51.Bh6 Nf3 52.Bxg7 Bxg7 53.Rd6 Qe7 54.Qxh7+ Kf8 55.f6 Bxf6 56.Qh6+ Bg7 57.Qh3 Qe1+ 58.Kg2 Qe6 59.Rxe6 Ng5 60.Re8+ Kxe8 61.Qc8+ Ke7 62.Qc7+ Ke8 63.Qb8+ Ke7 64.Qd6+ Ke8 65.Re1+ Be5 66.Rxe5+ Ne6 67.Rxe6+ fxe6 68.Bg6+

More analysis for other options stockfish suggested for black at smaller depth except Qc7 and Qe8
After 50.Rd4 Ng6 there is mate in 17


35/34 00:20 104,934k 5,057k +M17 51.Rd6 Be5 52.Qh6 Kf8 53.Bg5 Bxd6 54.fxg6 Qe6 55.gxh7 Qc4+ 56.Ke1 Qc3+ 57.Bd2 Qe5+ 58.Kd1 Qa1+ 59.Ke2 Qe5+ 60.Be3 Ke8 61.h8Q+ Bf8 62.Rd1 Qe6 63.Q6xg7 Qc4+ 64.Kf3 Qg4+ 65.Qxg4 f5 66.Qg6+ Ke7 67.Bg5+


after 50.Rd4 Nc4 mate in 14
31/36 00:34 170,662k 4,937k +M14 51.Rxc4 Kf8 52.Bh6 Bg6 53.Bxg7+ Bxg7 54.fxg6 Qxh3+ 55.Rxh3 b5 56.Re4 f5 57.Rf4 Ke8 58.Rxf5 Bd4 59.Rf7 Bf6 60.Rxf6 Ke7 61.Rf7+ Ke6 62.Re3+ Kd5 63.Bb3+ Kd4 64.Rf4+

[AndrewGrant]

Thank you for the thorough analysis.

I'm surprised that Ethereal got stuck at M32, and could not resolve down to a faster one. I gave it a few depths after the first mate.

Also, were you using table bases here? I was not.

[Uri Blass]

Thank you for the thorough analysis.

I'm surprised that Ethereal got stuck at M32, and could not resolve down to a faster one. I gave it a few depths after the first mate.

Also, were you using table bases here? I was not.

I did not use tablebases.

I tried also Booot that needed less nodes relative to stockfish to see the mate but more time.

In both cases I use 3 cores and 1024 mbytes hash(I have 4 cores but I use only 3 in order not to have problems with doing other tasks at the same time).

[d]2q3k1/1p3prb/p1p2b2/P1P1nP2/1P2R3/7Q/2B2P2/2B2K1R w - - 1 50

Booot6:
15+ 00:00 629k 2,116k +7.25 50.Rd4
15 00:00 698k 2,028k +7.27 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd8+ Kg7 55.Re8 Bf6 56.Bf4 Bd4 57.Re7 Kg8
16+ 00:00 859k 2,117k +7.37 50.Rd4
16+ 00:00 984k 2,097k +7.47 50.Rd4
16+ 00:00 1,177k 2,091k +7.64 50.Rd4
16+ 00:00 1,468k 2,088k +7.90 50.Rd4
16 00:00 1,508k 2,097k +7.86 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Re3 f6 57.Rxb7 Bg6 58.Rb6 Bd4
17 00:00 1,628k 2,125k +7.86 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Re3 f6 57.Rxb7 Bg6 58.Rb6 Bd4 59.Rg3
18+ 00:00 1,821k 2,117k +7.96 50.Rd4
18+ 00:00 1,955k 2,121k +8.06 50.Rd4
18 00:00 2,096k 2,127k +8.12 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Re3 Bg7 57.Rxb7 Ba4 58.Re8+ Kh7 59.Rxf7 Kg6 60.Ree7 Bf6 61.Rc7
19+ 00:01 2,548k 2,145k +8.22 50.Rd4
19+ 00:01 2,897k 2,156k +8.32 50.Rd4
19+ 00:01 3,316k 2,187k +8.49 50.Rd4
19 00:01 3,421k 2,189k +8.45 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Kg7 55.Rxb7 Rg1+ 56.Kxg1 Bxc2 57.Rb6 Ba4 58.Bh6+ Kg6 59.Rxa6 f6 60.Rb6 Bb5 61.a6
20+ 00:01 4,142k 2,190k +8.55 50.Rd4
20 00:01 4,255k 2,196k +8.56 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Re3 Bf6 57.Rxb7 Kf8 58.Rb8+ Kg7 59.Rb6 Ba4 60.Rxa6 Bb5 61.Rg3+ Kh7 62.Rb6
21+ 00:02 5,149k 2,212k +8.66 50.Rd4
21+ 00:02 5,731k 2,236k +8.76 50.Rd4
21+ 00:02 6,533k 2,248k +8.93 50.Rd4
21+ 00:03 7,893k 2,255k +9.19 50.Rd4
21 00:03 8,092k 2,252k +9.07 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Re3 Bf6 57.Rxb7 Kf8 58.Rb6 Bd4 59.Rg3 Be4 60.Rxa6 f5 61.Bf4 Ke7 62.Ra7+ Kf6
22+ 00:04 10,073k 2,238k +9.17 50.Rd4
22+ 00:04 10,645k 2,241k +9.27 50.Rd4
22+ 00:04 10,923k 2,247k +9.44 50.Rd4
22+ 00:06 13,688k 2,258k +9.70 50.Rd4
22+ 00:07 17,125k 2,288k +10.07 50.Rd4
22 00:08 18,449k 2,288k +9.76 50.Rd4 Qf8 51.Bh6 Kh8 52.Bg5 Bxg5 53.f6 Ng6 54.fxg7+ Qxg7 55.Qc8+ Qg8 56.Qxb7 Bf6 57.Rg4 Bd8 58.Qxc6 Qg7 59.Qxa6 Qa1+ 60.Kg2 Nf4+ 61.Kh2 Qe5 62.Qh6 Nd3+ 63.Kg2 Qd5+ 64.Kg1
23+ 00:08 19,301k 2,292k +9.86 50.Rd4
23+ 00:08 19,527k 2,293k +9.96 50.Rd4
23+ 00:08 20,386k 2,297k +10.13 50.Rd4
23+ 00:10 23,454k 2,306k +10.39 50.Rd4
23 00:10 24,077k 2,310k +10.24 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Re3 Bf6 57.Rxb7 Kf8 58.Rg3 Bg6 59.Rb6 Be5 60.Rxg6 fxg6 61.Rxa6 Bc3 62.Rxc6 Bxb4 63.a6
24+ 00:11 25,702k 2,327k +10.34 50.Rd4
24+ 00:11 26,788k 2,339k +10.44 50.Rd4
24+ 00:13 31,261k 2,354k +10.61 50.Rd4
24 00:14 33,016k 2,353k +10.74 50.Rd4 Qf8 51.Bh6 Kh8 52.Bg5 Bxg5 53.f6 Ng6 54.Bxg6 fxg6 55.fxg7+ Qxg7 56.Rd7 Be7 57.Rxb7 Qf7 58.Qxh7+ Qxh7 59.Rxh7+ Kxh7 60.Rxe7+ Kh6 61.Rc7 Kg5 62.Rxc6 Kf4 63.Rxg6 Ke4
25+ 00:15 36,811k 2,361k +10.84 50.Rd4
25+ 00:16 39,956k 2,359k +10.94 50.Rd4
25+ 00:17 40,987k 2,361k +11.11 50.Rd4
25 00:19 45,704k 2,396k +11.25 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Re3 Bf6 57.Rxb7 Kg7 58.Rc7 Bd4 59.Rg3+ Kf6 60.Rxc6+ Ke5 61.Rxa6 Kd5 62.c6 Be5 63.Rg5 Kd6
26 00:19 47,243k 2,404k +11.28 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Re3 Ba1 57.Rxb7 Kg7 58.Rb6 Bd4 59.Rg3+ Kf8 60.Rxc6 Be4 61.Rxa6 Bxc5 62.bxc5 f5 63.Rh6 f4 64.Bxf4 Ke7
27+ 00:21 52,243k 2,435k +11.38 50.Rd4
27+ 00:23 57,775k 2,467k +11.48 50.Rd4
27 00:26 65,056k 2,496k +11.63 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Re3 Ba1 57.Rxb7 Kg7 58.Rb6 Kf8 59.Rxc6 Bd4 60.Rg3 Be5 61.Bh6+ Ke7 62.Re3 Kd7 63.Rxa6 Bc7 64.b5 Kc8 65.Re7 Ba4
28+ 00:27 69,495k 2,517k +11.73 50.Rd4
28+ 00:30 75,880k 2,529k +11.83 50.Rd4
28+ 00:31 81,346k 2,545k +12.00 50.Rd4
28 00:36 93,904k 2,564k +12.15 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Re3 Ba1 57.Rxb7 Kg7 58.Rb6 Kf8 59.Rxc6 Bd4 60.Rg3 Be5 61.Bh6+ Ke7 62.Re3 f6 63.Rxa6 Kd8 64.Bg5 Kc8 65.Bxf6 Ba4 66.Bxe5 Bb5 67.Rd6
29+ 00:39 101,402k 2,580k +12.25 50.Rd4
29+ 00:40 104,629k 2,582k +12.35 50.Rd4
29 00:45 117,424k 2,578k +12.44 50.Rd4 Ng6 51.Rd6 Be5 52.fxg6 Qxh3+ 53.Rxh3 Rxg6 54.Rd7 Rg1+ 55.Kxg1 Bxc2 56.Re3 Ba1 57.Rxb7 Kg7 58.Rb6 Bd4 59.Rg3+ Kf8 60.Rxc6 Be5 61.Bh6+ Ke7 62.Re3 f6 63.Rxa6 Kd7 64.b5 Kc8 65.Rc6+ Kb7 66.Rb6+ Ka8 67.Bg7 f5 68.Bxe5 Ka7 69.Rd6
30+ 00:50 130,021k 2,599k +12.54 50.Rd4
30+ 00:51 134,292k 2,603k +12.64 50.Rd4
30+ 00:53 138,448k 2,610k +12.81 50.Rd4
30+ 00:59 156,766k 2,629k +13.07 50.Rd4
30+ 01:05 171,529k 2,638k +13.44 50.Rd4
30+ 01:24 223,578k 2,662k +13.95 50.Rd4
30+ 01:38 262,894k 2,674k +14.63 50.Rd4
30+ 02:06 340,830k 2,690k +15.53 50.Rd4
30+ 02:50 462,274k 2,707k +16.70 50.Rd4
30 04:12 693,782k 2,743k +18.10 50.Rd4 Qe8 51.Bh6 Nf3 52.Bxg7 Bxg7 53.Rg4 Nd2+ 54.Kg2 Bg6 55.fxg6 Qd7 56.gxf7+ Kf8 57.Qh8+ Bxh8 58.Rxh8+ Kxf7 59.Rh7+ Ke6 60.Rg6+ Kd5 61.Rxd7+ Kc4 62.Rxd2 Kxb4 63.Be4 Kxc5 64.Rd7 Kc4 65.Rxb7 Kd4 66.Bxc6 Kc4 67.Bd7 Kd3 68.Rxa6
31+ 04:17 707,421k 2,745k +18.20 50.Rd4
31+ 04:26 732,590k 2,748k +18.15 50.Rd4
31+ 04:59 820,587k 2,742k +18.41 50.Rd4
31+ 05:12 853,451k 2,731k +18.78 50.Rd4
31 06:00 941,835k 2,615k +19.19 50.Rd4 Ng6 51.Rd6 Be5 52.Qh6 Kf8 53.fxg6 Bg8 54.gxf7 Bxf7 55.Qh8+ Bg8 56.Bh6 Ke7 57.Bxg7 Bc4+ 58.Bd3 Qxh8 59.Bxh8 Bxd3+ 60.Rxd3 Bf4 61.Rh7+ Ke6 62.Rxb7 Bg5 63.Ra7 Be7 64.Rxa6 Kf7 65.Rxc6 Kg8 66.Rg6+ Kf7 67.Rg7+ Ke6 68.Re3+ Kd5 69.Rgxe7 Kc4 70.R3e4+ Kb5 71.Rb7+ Kc6
32+ 06:28 1,001,737k 2,575k +19.29 50.Rd4
32+ 06:35 1,014,207k 2,566k +19.39 50.Rd4
32+ 06:59 1,055,671k 2,519k +19.56 50.Rd4
32+ 08:06 1,201,071k 2,468k +19.82 50.Rd4
32+ 09:16 1,329,607k 2,391k +20.19 50.Rd4
32+ 10:51 1,527,219k 2,343k +20.70 50.Rd4
32+ 12:21 1,738,730k 2,344k +21.38 50.Rd4
32+ 14:20 2,023,414k 2,350k +22.28 50.Rd4
32 15:24 2,174,080k 2,352k +20.50 50.Rd4 Ng6 51.Rd6 Be5 52.Qh6 Kf8 53.fxg6 Bg8 54.gxf7 Bxf7 55.Qh8+ Bg8 56.Bh6 Ke7 57.Bxg7 Bc4+ 58.Bd3 Qxh8 59.Bxh8 Bxd3+ 60.Rxd3 Bf4 61.Rh7+ Ke6 62.Rxb7 Kf5 63.Ra7 Bc1 64.Rxa6 Ke4 65.Rd4+ Kf5 66.Rxc6 Bb2 67.Rf6+ Kg5 68.Rd5+ Kg4 69.Rg6+ Kf4 70.Bxb2 Ke4 71.Rgd6 Kf3
33+ 15:31 2,188,258k 2,348k +20.60 50.Rd4
33+ 15:33 2,190,968k 2,348k +20.70 50.Rd4
33+ 15:35 2,196,796k 2,349k +20.87 50.Rd4
33+ 15:37 2,201,908k 2,348k +21.13 50.Rd4
33+ 15:40 2,207,500k 2,347k +21.50 50.Rd4
33+ 15:43 2,213,185k 2,346k +22.01 50.Rd4
33+ 16:35 2,313,892k 2,323k +22.69 50.Rd4
33+ 18:40 2,576,542k 2,300k +23.59 50.Rd4
33 18:49 2,593,562k 2,297k +23.41 50.Rd4 Ng6 51.Rd6 Be5 52.Qh6 Kf8 53.fxg6 Bg8 54.gxf7 Bxf7 55.Qh8+ Bg8 56.Bh6 Ke7 57.Bxg7 Bc4+ 58.Bd3 Qxh8 59.Bxh8 Bxd3+ 60.Rxd3 Bf4 61.Rh7+ Ke6 62.Rxb7 Kf5 63.Ra7 Bc1 64.Rxa6 Ke4 65.Rd4+ Kf5 66.Rxc6 Ba3 67.a6 Bb2 68.Rf6+ Kg5 69.Rd5+ Kg4 70.Rg6+ Kf4 71.Bxb2 Ke4 72.a7 Kxd5
34+ 18:54 2,604,157k 2,295k +23.51 50.Rd4
34+ 19:54 2,732,697k 2,287k +23.61 50.Rd4
34+ 21:13 2,899,176k 2,277k +23.78 50.Rd4
34+ 22:04 2,992,421k 2,260k +24.04 50.Rd4
34+ 22:31 3,046,933k 2,254k +24.41 50.Rd4
34 24:23 3,238,406k 2,212k +24.57 50.Rd4 Ng6 51.Rd6 Be5 52.Qh6 Kf8 53.fxg6 Bg8 54.gxf7 Bxf7 55.Qh8+ Bg8 56.Bh6 Ke7 57.Bxg7 Bc4+ 58.Bd3 Qxh8 59.Bxh8 Bxd3+ 60.Rxd3 Bf4 61.Rh7+ Ke6 62.Rxb7 Kf5 63.Ra7 Bc1 64.Rxa6 Kg5 65.Rxc6 Bf4 66.Rd5+ Kg4 67.Rd7 Kf3 68.a6 Bh6 69.Rd3+ Kf4 70.Rd4+ Kg5 71.Rxh6 Kxh6 72.a7
35+ 26:04 3,404,764k 2,176k +24.67 50.Rd4
35+ 27:14 3,521,427k 2,154k +24.77 50.Rd4
35+ 28:05 3,608,436k 2,141k +24.94 50.Rd4
35+ 28:50 3,683,395k 2,128k +24.83 50.Rd4
35+ 29:00 3,698,719k 2,126k +24.71 50.Rd4
35+ 30:42 3,864,470k 2,098k +24.50 50.Rd4
35+ 32:16 4,105,280k 2,120k +26.01 50.Rd4
35+ 36:11 4,728,291k 2,177k +27.94 50.Rd4
35 38:21 5,074,690k 2,205k +28.39 50.Rd4 Ng6 51.Rd6 Be5 52.Qh6 Kf8 53.fxg6 Bg8 54.gxf7 Bxf7 55.Qh8+ Bg8 56.Bh6 Ke7 57.Bxg7 Bc4+ 58.Bd3 Qxh8 59.Bxh8 Bxd3+ 60.Rxd3 Bf4 61.Rh7+ Ke6 62.Rxb7 Bc1 63.Ra7 Bg5 64.Rxa6 Kf5 65.Rxc6 Bf4 66.Rd5+ Kg4 67.Rd4 Kg5 68.a6 Bb8 69.Rd7 Kf5 70.Rf6+ Kg4 71.Rf8 Bf4 72.a7 Kh5 73.Rd5+ Kg4 74.a8Q
36+ 38:32 5,104,365k 2,207k +28.49 50.Rd4
36+ 38:38 5,122,229k 2,209k +28.59 50.Rd4
36+ 38:47 5,146,309k 2,211k +28.76 50.Rd4
36+ 40:58 5,497,937k 2,237k +29.02 50.Rd4
36+ 41:22 5,562,363k 2,241k +29.39 50.Rd4
36+ 42:06 5,683,538k 2,249k +29.90 50.Rd4
36+ 43:20 5,884,648k 2,263k +30.58 50.Rd4
36+ 45:31 6,245,664k 2,287k +31.48 50.Rd4
36 45:44 6,280,230k 2,288k +31.81 50.Rd4 Ng6 51.Rd6 Be5 52.Qh6 Kf8 53.fxg6 Bg8 54.gxf7 Bxf7 55.Qh8+ Bg8 56.Bh6 Ke7 57.Bxg7 Bc4+ 58.Bd3 Qxh8 59.Bxh8 Bxd3+ 60.Rxd3 Bf4 61.Rh7+ Ke6 62.Rxb7 Bc1 63.Ra7 Bg5 64.Rxa6 Kf5 65.Rxc6 Bf4 66.a6 Bb8 67.Rd7 Kg4 68.Rg6+ Kf4 69.Rb6 Kg4 70.Rxb8 Kh3 71.a7 Kh4 72.a8Q Kg5 73.Rg8+ Kf5 74.Qf3+
37+ 45:49 6,293,767k 2,289k +31.91 50.Rd4
37+ 45:52 6,301,582k 2,290k +32.01 50.Rd4
37+ 45:56 6,313,398k 2,290k +32.18 50.Rd4
37+ 47:53 6,557,260k 2,282k +32.44 50.Rd4
37+ 48:56 6,689,773k 2,278k +32.81 50.Rd4
37+ 49:16 6,730,531k 2,277k +33.32 50.Rd4
37+ 49:24 6,747,955k 2,276k +34.00 50.Rd4
37+ 50:57 6,948,414k 2,272k +34.90 50.Rd4
37+ 51:55 7,090,862k 2,276k +36.07 50.Rd4
37+ 52:16 7,147,267k 2,278k +37.58 50.Rd4
37+ 53:40 7,365,642k 2,287k +39.51 50.Rd4
37+ 54:13 7,451,196k 2,290k +41.97 50.Rd4
37+ 54:48 7,542,470k 2,294k +45.09 50.Rd4
37+ 55:20 7,626,030k 2,296k +49.04 50.Rd4
37+ 55:30 7,651,187k 2,297k +54.02 50.Rd4
37+ 55:37 7,671,224k 2,298k +60.32 50.Rd4
37+ 55:39 7,675,416k 2,298k +68.34 50.Rd4
37+ 55:42 7,682,293k 2,299k +M109 50.Rd4
37+ 57:55 7,984,588k 2,297k +M109 50.Rd4
37 1:02:35 8,634,569k 2,299k +M22 50.Rd4 Ng6 51.Rd6 Be5 52.Qh6 Kf8 53.fxg6 Bg8 54.gxf7 Bxf7 55.Qh8+ Bg8 56.Bh6 Ke7 57.Bxg7 Bc4+ 58.Bd3 Qxh8 59.Bxh8 Bxd3+ 60.Rxd3 Bxh8 61.Rxh8 Kf6 62.Rh6+ Kg5 63.Rhd6 Kf5 64.Rf3+ Ke5 65.Rf7 Ke4 66.Rf8 Ke5 67.f3 b5 68.axb6 a5 69.b7 axb4 70.b8Q b3 71.Rdd8+
38 1:03:15 8,730,348k 2,300k +M22 50.Rd4 Ng6 51.Rd6 Be5 52.Qh6 Kf8 53.fxg6 Bg8 54.gxf7 Bxf7 55.Qh8+ Bg8 56.Bh6 Ke7 57.Bxg7 Bc4+ 58.Bd3 Qxh8 59.Bxh8 Bxd3+ 60.Rxd3 Bxh8 61.Rxh8 Kf6 62.Rh6+ Kg5 63.Rhd6 Kf5 64.Rf3+ Ke5 65.Rf7 Ke4 66.Rf8 Ke5 67.f3 b5 68.axb6 a5 69.b7 axb4 70.b8Q b3 71.Qe8+
39 1:04:03 8,846,933k 2,302k +M22 50.Rd4 Ng6 51.Rd6 Be5 52.Qh6 Kf8 53.fxg6 Bg8 54.gxf7 Bxf7 55.Qh8+ Bg8 56.Bh6 Ke7 57.Bxg7 Bc4+ 58.Bd3 Qxh8 59.Bxh8 Bxd3+ 60.Rxd3 Bxh8 61.Rxh8 Kf6 62.Rh6+ Kg5 63.Rhd6 Kf5 64.Rf3+ Ke5 65.Rf7 Ke4 66.Rf8 Ke5 67.f3 b5 68.axb6 a5 69.b7 axb4 70.b8Q b3 71.Qe8+
40 1:05:00 8,980,582k 2,303k +M22 50.Rd4 Ng6 51.Rd6 Be5 52.Qh6 Kf8 53.fxg6 Bg8 54.gxf7 Bxf7 55.Qh8+ Bg8 56.Bh6 Ke7 57.Bxg7 Bc4+ 58.Bd3 Qxh8 59.Bxh8 Bxd3+ 60.Rxd3 Bxh8 61.Rxh8 Kf6 62.Rh6+ Kg5 63.Rhd6 Kf5 64.Rf3+ Ke5 65.Rf7 Ke4 66.Rf8 Ke5 67.f3 b5 68.axb6 a5 69.b7 axb4 70.b8Q b3 71.Qe8+
41 1:07:36 9,368,793k 2,310k +M21 50.Rd4 Ng6 51.Rd6 Be5 52.Qh6 Kf8 53.fxg6 Bg8 54.gxf7 Bxf7 55.Qh8+ Bg8 56.Bh6 Qg4 57.Bxg7+ Qxg7 58.Rd8+ Ke7 59.Qxg8 Qxg8 60.Rxg8 b6 61.Rh7+ Ke6 62.Re8+ Kf6 63.Rf8+ Kg5 64.Rg8+ Bg7 65.Rgxg7+ Kf6 66.axb6 a5 67.b7 Ke6 68.b8Q Kd5 69.Rg4 axb4 70.Qd6+

[Uri Blass]

Booot after more time claim mate in 16

FEN: 2q3k1/1p3prb/p1p2b2/P1P1nP2/1P2R3/7Q/2B2P2/2B2K1R w - - 1 50

Booot6:

42 1:14:39 10,495,408k 2,343k +M18 50.Rd4 Nc4 51.Rxc4 Qd7 52.Rg4 Kf8 53.Rxg7 Bxg7 54.Bh6 Qd4 55.f6 Qxf6 56.Qc8+ Ke7 57.Bxg7 Bd3+ 58.Bxd3 Qxg7 59.Qxb7+ Kf8 60.Qb8+ Ke7 61.Qd6+ Ke8 62.Rh7 Qf8 63.Qxc6+ Ke7 64.Bf5 Qg7 65.Qd6+ Ke8 66.Rxg7 f6 67.Qe7+
43 1:19:01 11,182,904k 2,359k +M16 50.Rd4 Nc4 51.Rxc4 Qd7 52.Rg4 Kf8 53.Bf4 Qd5 54.Bd6+ Ke8 55.Rxg7 Bxg7 56.Qe3+ Be5 57.Rxh7 Qc4+ 58.Bd3 Qf4 59.Bxe5 Qxe3 60.fxe3 Ke7 61.Bc4 Ke8 62.Bxf7+ Ke7 63.Be6+ Ke8 64.f6 Kd8 65.Rh8+
44 1:20:33 11,434,558k 2,366k +M16 50.Rd4 Nc4 51.Rxc4 Qd7 52.Rg4 Kf8 53.Bf4 Qd5 54.Bd6+ Ke8 55.Rxg7 Bxg7 56.Qe3+ Be5 57.Rxh7 Qc4+ 58.Bd3 Qf4 59.Bxe5 Qxe3 60.fxe3 Ke7 61.Bc4 Ke8 62.Bxf7+ Ke7 63.Be6+ Ke8 64.f6 Kd8 65.Rh8+
45 1:21:30 11,591,630k 2,370k +M16 50.Rd4 Nc4 51.Rxc4 Qd7 52.Rg4 Kf8 53.Bf4 Qd5 54.Bd6+ Ke8 55.Rxg7 Bxg7 56.Qe3+ Be5 57.Rxh7 Qc4+ 58.Bd3 Qf4 59.Bxe5 Qxe3 60.fxe3 Ke7 61.Bc4 Ke8 62.Bxf7+ Ke7 63.Be6+ Ke8 64.f6 Kd8 65.Rh8+
46 1:23:05 11,825,490k 2,372k +M16 50.Rd4 Nc4 51.Rxc4 Qd7 52.Rg4 Kf8 53.Bf4 Qd5 54.Bd6+ Ke8 55.Rxg7 Bxg7 56.Qe3+ Be5 57.Rxh7 Qc4+ 58.Bd3 Qf4 59.Bxe5 Qxe3 60.fxe3 Ke7 61.Bc4 Ke8 62.Bxf7+ Ke7 63.Be6+ Ke8 64.f6 Kd8 65.Rh8+
47 1:24:26 12,033,175k 2,375k +M16 50.Rd4 Nc4 51.Rxc4 Qd7 52.Rg4 Kf8 53.Bf4 Qd5 54.Bd6+ Ke8 55.Rxg7 Bxg7 56.Qe3+ Be5 57.Rxh7 Qc4+ 58.Bd3 Qf4 59.Bxe5 Qxe3 60.fxe3 Ke7 61.Bc4 Ke8 62.Bxf7+ Ke7 63.Be6+ Ke8 64.f6 Kd8 65.Rh8+
48 1:27:03 12,463,939k 2,386k +M16 50.Rd4 Nc4 51.Rxc4 Qd7 52.Rg4 Kf8 53.Bf4 Qd5 54.Bd6+ Ke8 55.Rxg7 Bxg7 56.Qe3+ Be5 57.Rxh7 Qc4+ 58.Bd3 Qf4 59.Bxe5 Qxe3 60.fxe3 Ke7 61.Bc4 Ke8 62.Bxf7+ Ke7 63.Be6+ Ke8 64.f6 Kd8 65.Rh8+

After 50.Rd4 Qe8 stockfish's line it says mate in 15

FEN: 4q1k1/1p3prb/p1p2b2/P1P1nP2/1P1R4/7Q/2B2P2/2B2K1R w - - 3 51

Booot6:
34 00:00 853k 3,411k +M15 51.Bh6 Kf8 52.Rd6 Qe7 53.Rg1 Nc4 54.Bxg7+ Bxg7 55.Qxh7 Nxd6 56.Rxg7 Qf6 57.Qg8+ Ke7 58.cxd6+ Kxd6 59.Rxf7 Qxf7 60.Qxf7 c5 61.Qe6+ Kc7 62.bxc5 Kd8 63.f6 Kc7 64.Qd6+ Kc8 65.Bf5+

After Rd4 Qc7 also Booot say mate in 15

FEN: 6k1/1pq2prb/p1p2b2/P1P1nP2/1P1R4/7Q/2B2P2/2B2K1R w - - 3 51

Booot6:
41 01:45 301,402k 2,848k +M15 51.Bh6 Kf8 52.Rd6 Qe7 53.Rg1 Nc4 54.Bxg7+ Bxg7 55.Qxh7 Nxd6 56.Rxg7 Qf6 57.Qg8+ Ke7 58.cxd6+ Kxd6 59.Rxf7 Qxf7 60.Qxf7 c5 61.Qe6+ Kc7 62.bxc5 Kd8 63.f6 Kc7 64.Qd6+ Kc8 65.Bf5+

[zullil]

with more time stockfish see mate in 19

34/54 48:57 15,251,119k 5,192k +M19 50.Rd4 Qe8 51.Bh6 Nf3 52.Bxg7 Bxg7 53.Qxh7+ Kf8 54.Rd6 Qe7 55.f6 Bxf6 56.Qh6+ Bg7 57.Qh3 Qe1+ 58.Kg2 Qe8 59.Qxf3 Qe5 60.Rd8+ Ke7 61.Rhd1 Qg5+ 62.Kf1 Bd4 63.R1xd4 Qc1+ 64.Rd1 f5 65.Qxf5 Qxd1+ 66.Rxd1 Ke8 67.Qf6 b6 68.Bg6+
35/42 51:25 16,020,687k 5,192k +M19 50.Rd4 Qc7 51.Bh6 Nf3 52.Bxg7 Bxg7 53.Rd6 Qe7 54.Qxh7+ Kf8 55.f6 Bxf6 56.Qh6+ Bg7 57.Qh3 Qe1+ 58.Kg2 Qe6 59.Rxe6 Ng5 60.Re8+ Kxe8 61.Qc8+ Ke7 62.Qc7+ Ke8 63.Qb8+ Ke7 64.Qd6+ Ke8 65.Re1+ Be5 66.Rxe5+ Ne6 67.Rxe6+ fxe6 68.Bg6+

Latest Cfish says mate-in-15. The search is ongoing.

info depth 46 seldepth 30 multipv 1 score mate 15 nodes 23682901017 nps 52393364 hashfull 999 tbhits 0 time 452021 pv e4d4 g8f8 c1h6 c8c7 d4d6 e5c4 d6f6 f8e8 h6g7 c7f4 h3d3 c4d2 f1e2 f4g4 e2d2 g4b4 d2d1 b4g4 f2f3 g4g3 f6d6 g3f3 d3f3 f7f6 f3e3 e8f7 d6d7 f7g8 c2b3

[kgburcham]

[d]2q3k1/1p3prb/p1p2b2/P1P1nP2/1P2R3/7Q/2B2P2/2B2K1R w - -


Nalimov 6 men EGTB available - 999 MB cache
Engine: Houdini 6.01 Pro x64-pext (8192 MB)
by Robert Houdart
8 threads used
15/34 0:00 +10.38 1.Rd4 Nc4 2.Rxc4 Qd7 3.Rg4 Rxg4 4.Qxg4+ Bg6 5.Rg1 Kf8 6.fxg6 Qxg4 7.Rxg4 fxg6 8.Rxg6 (9.057.797) 16773
16/36 0:00 +10.46 1.Rd4 Nc4 2.Rxc4 Qd7 3.Rg4 Rxg4 4.Qxg4+ Bg6 5.Rg1 Kf8 6.Bh6+ Ke8 7.fxg6 Qxg4 8.Rxg4 fxg6 9.Bxg6+ Ke7 10.Re4+ Kd7 11.Bf5+ Kd8 (12.456.494) 17421 TB:3
17/53 0:02 +11.71 1.Rd4 Nc4 2.Rxc4 Qd7 3.Rg4 Rxg4 4.Qxg4+ Bg6 5.Qg3 Qd5 6.Qb8+ Qd8 7.Qxd8+ Bxd8 8.fxg6 fxg6 9.Bxg6 Bf6 10.Rh7 Bg7 11.Kg2 (36.461.237) 18194 TB:56
18/53 0:03 +12.80 1.Rd4 Qf8 2.Bh6 Nf3 3.Rg4 Rxg4 4.Bxf8 Nd2+ 5.Ke2 Rh4 6.Qg3+ Kxf8 7.Rxh4 Bxh4 8.Qxh4 Bxf5 9.Bxf5 Nb3 10.Qh6+ Ke7 11.Qd6+ Ke8 12.Qb8+ Ke7 13.Qxb7+ Kf6 14.Qxc6+ (61.748.410) 18007 TB:191
19/53 0:03 +11.98 1.Rd4 Qf8 2.Bh6 Nf3 3.Rg4 Rxg4 4.Bxf8 Rh4 5.Qxf3 Rxh1+ 6.Qxh1 Bxf5 7.Bxf5 Kxf8 8.Qh6+ Ke7 9.Qf4 Kf8 10.Qb8+ Kg7 11.Qxb7 Bc3 12.Be6 Kh7 (64.499.388) 18056 TB:210
20/53 0:04 +12.62 1.Rd4 Qf8 2.Bh6 Nf3 3.Rg4 Rxg4 4.Bxf8 Rh4 5.Qxf3 Rxh1+ 6.Qxh1 Bxf5 7.Bxf5 Kxf8 8.Qh6+ Ke7 9.Qf4 Kf8 10.Bc8 Bc3 11.Qd6+ Ke8 12.Bxb7 f5 (74.086.829) 18402 TB:330
21/53 0:07 +12.28 1.Rd4 Nc4 2.Rxc4 Qd7 3.Rg4 Rxg4 4.Qxg4+ Bg6 5.Rg1 Qd4 6.fxg6 Qxg4 7.Rxg4 Kg7 8.gxf7+ Kxf7 9.Bf5 Bc3 10.Bc8 Ke7 11.Bxb7 Kd8 12.Bxa6 (131.707.168) 18708 TB:771
22/53 0:08 +13.52 1.Rd4 Nc4 2.Rxc4 Qd7 3.Rg4 Rxg4 4.Qxg4+ Bg6 5.Rg1 Qd4 6.fxg6 Qxg4 7.Rxg4 fxg6 8.Bxg6 Kf8 9.Bf5 Kf7 10.Bc8 Bc3 11.Bxb7 Ke6 12.Bxc6 Ke7 13.Bb7 (162.181.700) 18622 TB:1.331
23/53 0:11 +13.97 1.Rd4 Nc4 2.Rxc4 Qd7 3.Bh6 Bxf5 4.Qxf5 Qxf5 5.Bxf5 Bg5 6.Bxg7 Kxg7 7.Rg4 Kf6 8.Bc8 Bd2 9.Bxb7 Ke7 10.Bxa6 f5 11.Rd4 Bc3 12.Rh7+ Ke8 13.Rf4 (215.611.979) 18901 TB:1.941
24/53 1:07 +19.26 1.Rd4 Nc4 2.Rxc4 Qd7 3.Rg4 Rxg4 4.Qxg4+ Bg6 5.Bh6 b5 6.cxb6 Qd5 7.Rh3 Qd7 8.Qg2 Qd4 9.fxg6 Qa1+ 10.Ke2 Qe5+ 11.Be3 Bg7 12.gxf7+ Kxf7 13.Rh7 Kf8 14.Qxc6 (1.477.171.733) 21843 TB:77.995
25/71 3:23 +22.49 1.Rd4 Kf8 2.Bh6 b5 3.axb6 Bg8 4.Rd6 Ke8 5.Rxf6 Rg4 6.Qe3 Qb8 7.Rd6 f6 8.Rxf6 Bc4+ 9.Ke1 Kd7 10.Rd6+ Qxd6 11.cxd6 c5 12.bxc5 Nc6 13.Bf4 Rg8 14.Rh7+ (4.624.085.204) 22687 TB:432.228
26/71 5:15 +26.39 1.Rd4 Kf8 2.Bh6 Bxf5 3.Bxf5 Qb8 4.Rd6 Ke8 5.Bxg7 Bxg7 6.Qh8+ Bxh8 7.Rxh8+ Ke7 8.Rxb8 b5 9.axb6 Nc4 10.Rbd8 Nd2+ 11.Rxd2 Kf6 12.Bc8 Kg7 13.b7 f5 14.b8Q (7.247.207.619) 22959 TB:561.521
27/71 6:29 +25.13 1.Rd4 Qe8 2.Bh6 Nf3 3.Bxg7 Bxg7 4.Qxh7+ Kf8 5.Rg4 Qe5 6.Kg2 Ng5 7.Rxg5 Qd5+ 8.Kh2 Qe5+ 9.Kh3 Qf6 10.Rg4 Qe5 11.Rg3 b6 12.axb6 a5 13.b7 Ke7 14.Qxg7 (8.975.989.661) 23053 TB:704.058
28/71 8:35 +89.92 1.Rd4 Nc4 2.Rxc4 Qd7 3.Bh6 Bxf5 4.Qxf5 Qxf5 5.Bxf5 Kf8 6.Rg4 Ke7 7.Bxg7 Bxg7 8.Rxg7 Kf6 9.Rxf7+ Kxf7 10.Rh7+ Kf6 11.Rxb7 Ke5 12.Ra7 Kd4 13.Rxa6 Kc3 14.Rxc6 (11.993.488.907) 23244 TB:1.050.313
29/71 8:59 +92.72 1.Rd4 Nc4 2.Rxc4 Qd7 3.Bh6 Bxf5 4.Qxf5 Qxf5 5.Bxf5 Rg6 6.Bxg6 fxg6 7.Rf4 Be7 8.Rg1 Kh7 9.Rf7+ Kxh6 10.Rxe7 g5 11.Rxb7 Kg6 12.Rb6 Kf5 13.Rxg5+ Kxg5 14.Rxa6 (12.538.772.384) 23242 TB:1.083.611
30/71 9:15 +92.72 1.Rd4 Nc4 2.Rxc4 Qd7 3.Bh6 Bxf5 4.Qxf5 Qxf5 5.Bxf5 Rg6 6.Bxg6 fxg6 7.Rf4 Be7 8.Rg1 Kh7 9.Rf7+ Kxh6 10.Rxe7 g5 11.Rxb7 Kg6 12.Rb6 Kf5 13.Rxg5+ Kxg5 14.Rxa6 (12.924.275.945) 23262 TB:1.106.101
31/71 9:18 +92.72 1.Rd4 Nc4 2.Rxc4 Qd7 3.Bh6 Bxf5 4.Qxf5 Qxf5 5.Bxf5 Rg6 6.Bxg6 fxg6 7.Rf4 Be7 8.Rg1 Kh7 9.Rf7+ Kxh6 10.Rxe7 g5 11.Rxb7 Kg6 12.Rb6 Kf5 13.Rxg5+ Kxg5 14.Rxa6 (12.994.919.394) 23266 TB:1.108.484
32/71 9:45 +93.72 1.Rd4 Nc4 2.Rxc4 Qd7 3.Bh6 Bxf5 4.Qxf5 Qxf5 5.Bxf5 Rg6 6.Bxg6 fxg6 7.Rf4 Be7 8.Rg1 Kh7 9.Rf7+ Kxh6 10.Rxe7 g5 11.Rxb7 Kg6 12.Rb6 Kf5 13.Rxa6 Ke6 14.Rxg5 (13.620.423.246) 23258 TB:1.161.030
33/71 10:35 +M19 1.Rd4 Nc4 2.Rxc4 Qd7 3.Bh6 Bxf5 4.Qxf5 Qxf5 5.Bxf5 Rg6 6.Bxg6 fxg6 7.Rf4 Be7 8.Rg1 Kh7 9.Rf7+ Kxh6 10.Rxe7 g5 11.Re6+ Kg7 12.Rxg5+ Kf8 13.Rd6 Kf7 14.Rh6 (14.786.625.340) 23253 TB:1.255.826
34/71 11:35 +M19 1.Rd4 Nc4 2.Rxc4 Qd7 3.Bh6 Bxf5 4.Qxf5 Qxf5 5.Bxf5 Rg6 6.Bxg6 fxg6 7.Rf4 Be7 8.Rg1 Kh7 9.Rf7+ Kxh6 10.Rxe7 g5 11.Re6+ Kg7 12.Rxg5+ Kf8 13.Rd6 Kf7 14.Rh6 (16.181.728.793) 23261 TB:1.376.658
35/71 11:47 +M17 1.Rd4 Nc4 2.Rxc4 Qd7 3.Bh6 Bxf5 4.Qxf5 Qxf5 5.Bxf5 Rg6 6.Bxg6 fxg6 7.Rf4 Be7 8.Rg1 Kh7 9.Bg5 Bxg5 10.Rxg5 Kh6 11.Rg1 Kg7 12.Rf5 Kh6 13.Rf6 Kg7 14.Rgxg6+ (16.463.100.628) 23260 TB:1.398.209
36/71 12:40 +M17 1.Rd4 Nc4 2.Rxc4 Qd7 3.Bh6 Bxf5 4.Qxf5 Qxf5 5.Bxf5 Rg6 6.Bxg6 fxg6 7.Rf4 Be7 8.Rg1 Kh7 9.Bg5 Bxg5 10.Rxg5 Kh6 11.Rg1 Kg7 12.Rf5 Kh6 13.Rf6 Kg7 14.Rgxg6+ (17.638.722.462) 23204 TB:1.681.147
37/71 19:31 +M17 1.Rd4 Nf3 2.Rg4 Qe8 3.Qxh7+ Kf8 4.Bh6 Nd2+ 5.Kg2 Qe5 6.Bxg7+ Bxg7 7.Rd1 Qd5+ 8.Be4 Qxe4+ 9.Rxe4 Nxe4 10.Qh4 Bf6 11.Qxe4 b6 12.Qxc6 Kg7 13.Rd7 bxc5 14.Qe6 (27.212.257.802) 23238 TB:2.283.020
38/71 21:25 +M16 1.Rd4 Nf3 2.Rg4 Qe8 3.Qxh7+ Kf8 4.Bh6 Nd2+ 5.Kg2 Qe5 6.Bxg7+ Bxg7 7.Re1 Qxe1 8.Qxg7+ Ke7 9.Qg5+ Ke8 10.Qg8+ Ke7 11.f6+ Ke6 12.Qe8+ Kxf6 13.Rf4+ Kg5 14.Qg8+ (29.884.237.601) 23241 TB:2.765.888

[kgburcham]

[d]2q3k1/1p3prb/p1p2b2/P1P1nP2/1P2R3/7Q/2B2P2/2B2K1R w - -


Engine: Stockfish 140718 64 BMI2 (8192 MB)
by T. Romstad, M. Costalba, J. Kiiski, G.

32/54 5:40 +72.06++ 1.Rd4 (7.248.070.334) 21281
32/56 5:42 +57.46-- 1.Rd4 Ng6 (7.297.063.563) 21292
32/56 5:42 +67.26++ 1.Rd4 (7.297.428.952) 21292
32/56 5:43 +73.91++ 1.Rd4 (7.322.201.773) 21296
32/56 5:50 +82.27++ 1.Rd4 (7.474.023.994) 21324
32/56 5:52 +93.77++ 1.Rd4 (7.523.027.957) 21333
32/56 5:53 +M50++ 1.Rd4 (7.533.326.720) 21336
32/56 6:40 +M29 1.Rd4 Nc4 2.Rxc4 Qd7 3.Bh6 Bxf5 4.Qxf5 Qxf5 5.Bxf5 Rg6 6.Bxg6 fxg6 7.Rf4 Bg7 8.Bxg7 g5 9.Rf8+ Kxg7 10.Rb8 g4 11.Rxb7+ Kf6 12.Rb6 Ke5 13.Rxc6 Kd5 14.Rg6 (8.615.939.380) 21523
33/58 6:48 +M27 1.Rd4 Nc4 2.Rxc4 Qd7 3.Bh6 Bxf5 4.Qxf5 Qxf5 5.Bxf5 Rg6 6.Bxg6 fxg6 7.Rf4 Be7 8.Rg1 Kh7 9.Rf7+ Kxh6 10.Rxe7 g5 11.Rxb7 Kg6 12.Rc7 Kf5 13.Rxc6 Ke4 14.Rxg5 (8.808.522.180) 21566
34/48 7:05 +M36-- 1.Rd4 Qf8 (9.200.737.208) 21630
34/48 7:07 +M27++ 1.Rd4 (9.242.706.624) 21637
34/48 7:19 +M22 1.Rd4 Qf8 2.Bh6 Nf3 3.Rd6 Ng1 4.Bxg7 Nxh3 5.Bxf8 Kxf8 6.Rxf6 Ng5 7.f4 Bxf5 8.Bxf5 Ne6 9.Bxe6 Ke7 10.Rxf7+ Kxe6 11.Rxb7 Kd5 12.Rb6 Kc4 13.Rxc6 Kd4 14.Rxa6 (9.522.698.828) 21669
35/40 7:49 +M20 1.Rd4 Kf8 2.Bh6 Qe8 3.Bxg7+ Bxg7 4.Qxh7 Nd7 5.Qh8+ Bxh8 6.Rxh8+ Kg7 7.Rxe8 Nf6 8.Rb8 Kh7 9.Rxb7 Kg7 10.Rd6 Ne8 11.Rxc6 Nf6 12.Bb3 Kh6 13.Rxf7 Kg5 14.Rcxf6 (10.158.791.783) 21645
36/40 7:52 +M20 1.Rd4 Kf8 2.Bh6 Qe8 3.Bxg7+ Bxg7 4.Qxh7 Nd7 5.Qh8+ Bxh8 6.Rxh8+ Kg7 7.Rxe8 Nf6 8.Rb8 Kh7 9.Rxb7 Kg7 10.Rd6 Ne8 11.Rxc6 Nf6 12.Bb3 Kh6 13.Rxf7 Kg5 14.Rcxf6 (10.222.906.995) 21649
37/38 8:27 +M19 1.Rd4 Kf8 2.Bh6 Qe8 3.Bxg7+ Bxg7 4.Qxh7 Nd7 5.Qh8+ Bxh8 6.Rxh8+ Kg7 7.Rxe8 Nf6 8.Rb8 Kh7 9.Rxb7 Kg7 10.Rd6 Ne8 11.Rxc6 Nf6 12.Rxf6 Kxf6 13.c6 Ke5 14.c7 (11.033.085.428) 21725
38/46 8:30 +M19 1.Rd4 Kf8 2.Bh6 Qe8 3.Bxg7+ Bxg7 4.Qxh7 Nf3 5.Rg4 Qe5 6.Kg2 Nd2 7.Rd1 Qd5+ 8.Be4 Qxe4+ 9.Rxe4 Nxe4 10.Rd7 Nf6 11.Rd8+ Ke7 12.Qxg7 Kxd8 13.Qxf6+ Ke8 14.Qe5+ (11.094.742.304) 21732
39/38 8:47 +M19 1.Rd4 Kf8 2.Bh6 Qc7 3.Bxg7+ Bxg7 4.Qxh7 Nf3 5.Rg4 Qe5 6.Kg2 Nd2 7.Rd1 Qd5+ 8.Be4 Qxe4+ 9.Rxe4 Nxe4 10.Rd7 Nf6 11.Rd8+ Ke7 12.Qxg7 Kxd8 13.Qxf6+ Ke8 14.Qe5+ (11.469.752.588) 21734
40/38 10:11 +M19 1.Rd4 Nc4 2.Rxc4 Qd7 3.Bh6 Bxf5 4.Qxf5 Qxf5 5.Bxf5 Bg5 6.Bxg7 Kxg7 7.Rh7+ Kf6 8.Bd3 Ke7 9.Re4+ Kf6 10.f4 Bh6 11.Rxh6+ Kg7 12.Rd6 Kf8 13.Rd8+ Kg7 14.Re7 (13.251.873.070) 21654
41/36 10:35 +M18 1.Rd4 Nc4 2.Rxc4 Qd7 3.Bh6 Bxf5 4.Qxf5 Qxf5 5.Bxf5 Bg5 6.Bxg7 Kxg7 7.Rh7+ Kf6 8.Bd3 Bd2 9.Ke2 Bg5 10.f4 Bh4 11.Rxh4 Ke6 12.Re4+ Kf5 13.Re8+ Kf6 14.Rg4 (13.766.788.458) 21674
42/34 12:15 +M16 1.Rd4 Kf8 2.Bh6 Qe8 3.Bxg7+ Bxg7 4.Qxh7 Nd7 5.Rd6 Nf6 6.Rxf6 Bxf6 7.Rg1 Ke7 8.Bb3 Bc3 9.f6+ Kd7 10.Rg8 Qe1+ 11.Kg2 Qe6 12.Qd3+ Qd5+ 13.Bxd5 Bxf6 14.Bb3+ (15.906.443.981) 21617
43/32 12:19 +M16 1.Rd4 Kf8 2.Bh6 Qe8 3.Bxg7+ Bxg7 4.Qxh7 Nd7 5.Rd6 Nf6 6.Rxf6 Bxf6 7.Rg1 Ke7 8.Bb3 Bc3 9.f6+ Kd7 10.Rg8 Qe1+ 11.Kg2 Qe6 12.Qd3+ Qd5+ 13.Bxd5 Bxf6 14.Bb3+ (15.990.476.890) 21624
44/32 12:36 +M16 1.Rd4 Kf8 2.Bh6 Qe8 3.Bxg7+ Bxg7 4.Qxh7 Nd7 5.Rd6 Nf6 6.Rxf6 Bxf6 7.Rg1 Ke7 8.Bb3 Bc3 9.f6+ Kd7 10.Rg8 Qe1+ 11.Kg2 Qe6 12.Qd3+ Qd5+ 13.Bxd5 Bxf6 14.Bb3+ (16.393.905.898) 21659
45/32 13:09 +M16 1.Rd4 Kf8 2.Bh6 Qe8 3.Bxg7+ Bxg7 4.Qxh7 Nd7 5.Rd6 Nf6 6.Rxf6 Bxf6 7.Rg1 Ke7 8.Bb3 Bc3 9.f6+ Kd7 10.Rg8 Qe1+ 11.Kg2 Qe6 12.Qd3+ Qd5+ 13.Bxd5 Bxf6 14.Bb3+ (17.113.689.081) 21686
46/32 13:45 +M16 1.Rd4 Kf8 2.Bh6 Qe8 3.Bxg7+ Bxg7 4.Qxh7 Nd7 5.Rd6 Nf6 6.Rxf6 Bxf6 7.Rg1 Ke7 8.Bb3 Bc3 9.f6+ Kd7 10.Rg8 Qe1+ 11.Kg2 Qe6 12.Qd3+ Qd5+ 13.Bxd5 Bxf6 14.Bb3+ (17.852.835.529) 21616
47/32 14:44 +M16 1.Rd4 Kf8 2.Bh6 Qe8 3.Bxg7+ Bxg7 4.Qxh7 Nd7 5.Rd6 Nf6 6.Rxf6 Bxf6 7.Rg1 Ke7 8.Bb3 Bc3 9.f6+ Kd7 10.Rg8 Qe1+ 11.Kg2 Qe6 12.Qd3+ Qd5+ 13.Bxd5 Bxf6 14.Bb3+ (19.060.638.792) 21555
48/32 15:27 +M16 1.Rd4 Nf3 2.Rg4 Qe8 3.Qxh7+ Kf8 4.Bh6 Nd2+ 5.Kg2 Qe5 6.Bxg7+ Bxg7 7.Re1 Qxe1 8.Qxg7+ Ke7 9.Qg5+ Ke8 10.Qg8+ Ke7 11.f6+ Ke6 12.Qe8+ Kxf6 13.Rf4+ Kg5 14.Qg8+ (19.989.842.552) 21548
49/32 17:14 +M16 1.Rd4 Kf8 2.Bh6 Qe8 3.Bxg7+ Bxg7 4.Qxh7 Nd7 5.Rd6 Nf6 6.Rxf6 Bxf6 7.Rg1 Ke7 8.Bb3 Bc3 9.f6+ Kd7 10.Rg8 Qe1+ 11.Kg2 Qe6 12.Qd3+ Qd5+ 13.Bxd5 Bxf6 14.Bb3+ (22.387.694.100) 21648
50/32 17:46 +M16 1.Rd4 Kf8 2.Bh6 Qe8 3.Bxg7+ Bxg7 4.Qxh7 Nd7 5.Rd6 Nf6 6.Rxf6 Bxf6 7.Rg1 Ke7 8.Bb3 Bc3 9.f6+ Kd7 10.Rg8 Qe1+ 11.Kg2 Qe6 12.Qd3+ Qd5+ 13.Bxd5 Bxf6 14.Bb3+ (23.129.127.915) 21693
51/32 18:10 +M16 1.Rd4 Kf8 2.Bh6 Qe8 3.Bxg7+ Bxg7 4.Qxh7 Nd7 5.Rd6 Nf6 6.Rxf6 Bxf6 7.Rg1 Ke7 8.Bb3 Bc3 9.f6+ Kd7 10.Rg8 Qe1+ 11.Kg2 Qe6 12.Qd3+ Qd5+ 13.Bxd5 Bxf6 14.Bb3+ (23.687.369.578) 21729
52/32 19:54 +M16 1.Rd4 Kf8 2.Bh6 Qe8 3.Bxg7+ Bxg7 4.Qxh7 Nd7 5.Rd6 Nf6 6.Rxf6 Bxf6 7.Rg1 Ke7 8.Bb3 Bc3 9.f6+ Kd7 10.Rg8 Qe1+ 11.Kg2 Qe6 12.Qd3+ Qd5+ 13.Bxd5 Bxf6 14.Bb3+ (26.131.144.856) 21874
53/32 20:40 +M16 1.Rd4 Kf8 2.Bh6 Qe8 3.Bxg7+ Bxg7 4.Qxh7 Nd7 5.Rd6 Nf6 6.Rxf6 Bxf6 7.Rg1 Ke7 8.Bb3 Bc3 9.f6+ Kd7 10.Rg8 Qe1+ 11.Kg2 Qe6 12.Qd3+ Qd5+ 13.Bxd5 Bxf6 14.Bb3+ (27.215.587.478) 21938
54/32 26:55 +M15 1.Rd4 Kf8 2.Bh6 Qe8 3.Rd6 Qe7 4.Rg1 Nc4 5.Bxg7+ Bxg7 6.Qxh7 Nxd6 7.Qxg7+ Ke8 8.Qd4 f6 9.cxd6 Qf7 10.Bb3 Qf8 11.Qe4+ Kd7 12.Qe6+ Kd8 13.Rg8 Qxg8 14.Qe7+ (35.683.705.408) 22094

[Uri Blass]

The following position comes from the final adjudicated position of one of the Stockfish vs Chiron matches in S11 for TCEC.

[d]2q3k1/1p3prb/p1p2b2/P1P1nP2/1P2R3/7Q/2B2P2/2B2K1R w - - 1 50

Here Ethereal resolves the line, with the following output, after nearly 24 hours of search, and 4 TRILLION nodes searched.

info depth 46 seldepth 74 score mate 32 time 92587321 nodes 4049199386496 nps 43733000 tbhits 0 hashfull 1 pv e4d4 e5g6 d4d6 f6e5 f5g6 c8h3 h1h3 g7g6 d6d7 g6g1 f1g1 h7c2 h3e3 e5a1 d7b7 g8f8 b7b8 f8g7 b8b6 g7g6 b6c6 g6f5 e3f3 f5e4 f3f4 e4e5 f4f7 c2b3 f7e7 e5f5 c6a6 a1f6 e7e8 f6e5 e8e5 f5e5 a6d6 b3c2 a5a6 e5f5 a6a7 c2e4 d6d8 f5f6 a7a8q e4a8 d8a8 f6e7 c5c6 e7d6 a8a6 d6e6 c6c7 e6d7 c1f4 d7c8 a6c6 c8d7 c7c8q d7e7 c8e6 e7d8 c6c8

Full UCI output can be found here : https://pastebin.com/raw/8Rv7xHFE

I'm curious if other engines will take as long, or even find the mate.

My conclusion from all the discussion is that stockfish is probably the best free source code to find mates.
It is maybe better if people who write a new engine start only by testing it in mates positions with the idea to become faster and only after they become as fast as stockfish start to test it in games.

Note that I do not know if I can trust stockfish in finding mates because I know one of the change was a decision to take a significant risk to have a hash collision in order to become faster so I think that it may be interesting to try to verify by a different program if all the mates that it reports are really correct(meaning no case that it says mate in X when there is practically only longer mate or even no mate).