Previous amazing Alpha Zero position is not amazing anymore!

[Nay Lin Tun]

Leela ID 31252, engine version 19.4, can reproduce Alpha Zero move, 21. Bg5!! at 15 secs, 26k nodes in my GTX 1060 GPU. (see the link)
https://ibb.co/dXwuAL
[d]rn3r1k/pn1p1ppq/bpp4p/7P/4N1Q1/6P1/PP3PB1/R1B1R1K1 w - - 3 21

[Jhoravi]

In contrast, How long can the latest Stockfish find it?

[Nay Lin Tun]

Dont know, probably 3 mins, 3 hours or 3 days in my 4 cores CPU.

[Werewolf]

SF got this quickly on my machine a few months ago IIRC

[jp]

Leela ID 31252, engine version 19.4, can reproduce Alpha Zero move, 21. Bg5!! at 15 secs, 26k nodes in my GTX 1060 GPU.

Did you try other Leela IDs? Maybe many 1xxxx and 2xxxx IDs are able to find that.

[Uri Blass]

Leela ID 31252, engine version 19.4, can reproduce Alpha Zero move, 21. Bg5!! at 15 secs, 26k nodes in my GTX 1060 GPU. (see the link)
https://ibb.co/dXwuAL
[d]rn3r1k/pn1p1ppq/bpp4p/7P/4N1Q1/6P1/PP3PB1/R1B1R1K1 w - - 3 21

It is clearly not amazing because it seems white can win by 21.b4

Stockfish_18111220_x64_modern:
1/1 00:00 145 73k +1.62 21.Bf4
2/2 00:00 341 171k +1.67 21.Bd2 c5
3/3 00:00 502 251k +1.29 21.Bd2 c5 22.Bf4
4/4 00:00 2k 654k -2.21 21.Qd1 d5 22.Bf4 dxe4
5/5 00:00 2k 764k -1.93 21.Kh1 d5 22.Bf4 dxe4
6/7 00:00 5k 1,142k -0.36 21.Qf4 d5 22.Nf6 Qc2 23.Qf3 Rc8
7/8 00:00 6k 1,438k +0.63 21.Qf4 d5 22.Nf6
8/11 00:00 9k 1,702k -0.55 21.Qf4 d5 22.Nc3 Nc5 23.Re7 Nbd7 24.Rxf7 Rxf7 25.Qxf7
9/13 00:00 17k 1,844k -0.03 21.Qf4 d5 22.Nd6 Nxd6 23.Qxd6 Kg8
10/12 00:00 25k 2,121k -0.51 21.Qf4 d5 22.Nd6 Nxd6 23.Qxd6 Kg8 24.Bf4 Qf5 25.Qa3 Bb5 26.Bd6 Nd7
11/16 00:00 37k 2,184k +0.03 21.Qf4 d5 22.Nd6 Nd7 23.Re7 Nxd6 24.Qxd6
12/14 00:00 44k 2,184k 0.00 21.Qf4 d5 22.Nd6 Nxd6 23.Qxd6 Rg8 24.Qf4 Rf8
13/21 00:00 81k 2,081k +0.15 21.Qf4 d5 22.Nd6 Nxd6 23.Qxd6 Rg8 24.Bh3 Bd3 25.b3 Be4 26.Qf4 Na6 27.Qxf7
14/23 00:00 161k 1,959k +0.09 21.Qf4 d5 22.Nd6 Nxd6 23.Qxd6 Kg8 24.b3 Qf5 25.Bb2 Nd7 26.Qxc6 Nc5 27.Qxd5 Qxd5 28.Bxd5 Rad8 29.Bf3 Nd3
15/21 00:00 335k 2,122k -0.04 21.Qf4 d5 22.Nd6 Nxd6 23.Qxd6 Kg8 24.Bd2 Qf5 25.Re7 Bb5 26.a4 Bc4 27.Rae1 Na6 28.Qxc6 Qxh5 29.R7e5
16/26 00:00 555k 2,136k +0.33 21.Qf4 d5 22.Nd6 Nxd6 23.Qxd6 Kg8 24.b3 Qf5 25.Ba3 Rc8 26.Re5 Qd7 27.Re7 Qxd6 28.Bxd6 Rd8 29.Bc7 Rc8 30.Rae1
17/28 00:00 974k 2,224k +0.09 21.Qf4 d5 22.Nd6 Nxd6 23.Qxd6 Kg8 24.b3 Qf5 25.Ba3 Rc8 26.Re5 Qf6 27.Qxf6 gxf6 28.Re7 Rd8 29.Rc1 c5 30.Bb2 Nc6 31.Rc7 Nd4 32.Bxd4 cxd4
18/31 00:00 1,314k 2,281k +0.14 21.Qf4 d5 22.Nd6 Nxd6 23.Qxd6 Kg8 24.b3 Qf5 25.Ba3 Rc8 26.Re5 Qf6 27.Qxf6 gxf6 28.Re7 Rd8 29.Rc1 c5 30.Ree1 Bb7 31.b4 Nd7 32.bxc5 bxc5 33.Bxc5 Nxc5 34.Rxc5 Re8 35.Rxe8+ Rxe8 36.Bxd5
19/25 00:00 1,632k 2,301k +0.18 21.b4 d5 22.Nf6 gxf6 23.Bb2 Qg7 24.Qf5 Nd6 25.Qf4 Nd7 26.Qxd6 Ne5 27.Bxe5 fxe5 28.Qxc6 Bc4 29.Bxd5 Rac8 30.Qb7 Bxd5 31.Qxd5
20/28 00:01 3,688k 2,352k +0.37 21.b4 d5 22.Nc3 Bc4 23.a4 Qc2 24.Nd1 Nd6 25.b5 Qf5 26.Qxf5 Nxf5 27.Nb2 Bb3 28.Nd3 c5 29.Nf4 Nd4 30.Bxd5 Bxd5
21/29 00:03 7,615k 2,322k +0.79 21.Nc3 d5 22.b4 Nd6 23.a4 Qd3 24.Bf4 Nc4 25.Rac1 Bc8 26.Qh4 Qf5 27.b5 Be6 28.Ne2 Nd7 29.bxc6 Nf6 30.Nd4
22/34+ 00:04 12,116k 2,432k +0.89 21.b4
22/34+ 00:05 13,958k 2,467k +0.99 21.b4
22/34 00:05 14,585k 2,482k +1.00 21.b4 d5 22.Nc3 Bc4 23.Bf4 Na6 24.Qd7 Nxb4 25.Qxb7 Qc2 26.Rac1 Qf5 27.Ne4 Nd3 28.Nd6 Qf6 29.Nxc4 dxc4 30.Bxc6 Rac8 31.Bd5 Nxc1 32.Rxc1 c3
23/35- 00:06 15,620k 2,507k +0.90 21.b4 d5
23/37+ 00:06 17,211k 2,540k +1.00 21.b4
23/37 00:07 20,272k 2,597k +1.11 21.b4 d5 22.Nc3 Bc4 23.Bf4 Na6 24.Qd7 Nxb4 25.Qxb7 Qc2 26.Rac1 Qf5 27.Ne4 Nd3 28.Nd6 Qxh5 29.Qxc6 Rad8 30.Qc7 Bxa2 31.Rcd1 Nxf4 32.gxf4 Qg6 33.Nb7 Ra8 34.Qc3
24/37- 00:09 24,146k 2,651k +1.01 21.b4 d5
24/37- 00:09 24,386k 2,654k +0.91 21.b4 d5
24/37+ 00:09 25,808k 2,668k +1.01 21.b4
24/41 00:11 32,044k 2,721k +1.20 21.b4 d5 22.Nc3 Bc4 23.Bf4 Na6 24.Qd7 Nxb4 25.Qxb7 Qc2 26.Rac1 Qf5 27.Ne4 Nd3 28.Nd6 Qf6 29.Nxc4 dxc4 30.Rf1 Nxc1 31.Rxc1 c5 32.Rxc4 Rad8 33.Qxa7 Rd1+ 34.Kh2 Rfd8 35.Qa6 Qb2
25/38- 00:12 34,569k 2,741k +1.11 21.b4 d5
25/38 00:13 37,974k 2,761k +1.09 21.b4 d5 22.Nc3 Bc4 23.Bf4 Na6 24.Qd7 Nxb4 25.Qxb7 Qc2 26.Rac1 Qf5 27.Ne4 Nd3 28.Nd6 Qf6 29.Nxc4 dxc4 30.Rf1 Nxc1 31.Rxc1 c5 32.Rxc4 Rae8 33.Qxa7 Re2 34.Rc1
26/35 00:17 49,650k 2,810k +1.13 21.b4 d5 22.Nc3 Bc4 23.Bf4 Na6 24.Qd7 Nxb4 25.Qxb7 Qc2 26.Rac1 Qf5 27.Ne4 Nd3 28.Nd6 Qf6 29.Red1 Nxc1 30.Rxc1 c5 31.Nxc4 dxc4 32.Rxc4 Rad8 33.Qxa7 Rd1+ 34.Kh2 Qf5 35.Be3 Qxh5+ 36.Rh4 Qg6 37.Bf3 Rd6 38.Qa6
27/39+ 00:27 78,225k 2,880k +1.23 21.b4
27/40- 00:27 79,425k 2,883k +1.04 21.b4 d5
27/40- 00:27 80,524k 2,885k +0.89 21.b4 d5
27/40+ 00:28 81,650k 2,885k +1.04 21.b4
27/48 00:29 85,330k 2,884k +1.09 21.b4 d5 22.Nc3 Bc4 23.Bf4 Na6 24.Qd7 Nxb4 25.Qxb7 Nc2 26.Qxc6 Rac8 27.Qb7 Nxe1 28.Rxe1 Qf5 29.Nxd5 Qxh5 30.Ne7 Rcd8 31.Bf3 Qa5 32.Rc1 Qxa2 33.Be5 Bd3 34.Bd5 Qa3 35.Rc3 Qa1+ 36.Kh2 Rde8
28/43- 00:30 88,320k 2,886k +1.00 21.b4 d5
28/44+ 00:31 90,752k 2,889k +1.09 21.b4
28/44+ 00:32 93,331k 2,891k +1.24 21.b4
28/44 00:32 95,413k 2,893k +1.23 21.b4 d5 22.Nc3 Bc4 23.Bf4 Na6 24.Qd7 Nxb4 25.Qxb7 Qc2 26.Rec1 Qf5 27.Ne4 Qxh5 28.Nd6 Nd3 29.Qxc6 Qg6 30.Qc7 Qf6 31.Nxc4 Rac8 32.Qd6 Nxc1 33.Rxc1 dxc4 34.Qxf6 gxf6 35.Bb7 Kg7 36.Bd6 Rfd8 37.Bxc8 Rxc8
29/45- 00:37 109,825k 2,904k +1.13 21.b4 d5
29/49- 00:38 113,262k 2,910k +1.04 21.b4 d5
29/49- 00:40 116,982k 2,911k +0.89 21.b4 d5
29/49+ 00:41 120,439k 2,915k +1.01 21.b4
29/49 00:42 124,538k 2,924k +1.08 21.b4 d5 22.Nc3 Bc4 23.Bf4 Na6 24.Qd7 Nxb4 25.Qxb7 Qf5 26.Re5 Qc2 27.Rc1 Qb2 28.Qe7 Nd3 29.Re2 Rae8 30.Qxf8+ Rxf8 31.Rxb2 Nxb2 32.Re1 d4 33.Nb1 c5 34.Re7 Bxa2 35.Na3 Nd3 36.Bd6 Rd8 37.Rxa7 Re8 38.Rb7 Re1+ 39.Bf1 Be6
30/40- 00:47 138,752k 2,944k +0.98 21.b4 d5
30/41- 00:47 140,919k 2,946k +0.88 21.b4 d5
30/49+ 00:53 156,656k 2,954k +0.98 21.b4
30/49 00:54 162,581k 2,961k +1.03 21.b4 d5 22.Nc3 Bc4 23.Bf4 Na6 24.Qd7 Nxb4 25.Qxb7 Qf5 26.Re5 Qc2 27.Nd1 d4 28.a3 Nd3 29.Qxc6 Rac8 30.Qe4 Be6 31.Rb5 Nxf4 32.Qxf4 Rfd8 33.Rb2 Qf5 34.Rd2 Qxf4 35.gxf4 Bg4 36.Nb2 Bxh5 37.Nd3
31/43- 01:10 211,758k 2,997k +0.94 21.b4 d5
31/43- 01:12 216,200k 3,001k +0.84 21.b4 d5
31/47- 01:27 265,527k 3,027k +0.70 21.b4 d5
31/54 01:45 322,110k 3,044k +0.73 21.b4 d5 22.Nc3 Bc4 23.Bf4 Qg8 24.Re7 Nd8 25.b5 Re8 26.Rae1 Ne6 27.Rxe8 Qxe8 28.bxc6 Qxc6 29.Qf5 Nxf4 30.Qxf4 Nd7 31.Qxf7 Qf6 32.Re8+ Rxe8 33.Qxe8+ Kh7 34.Bxd5 Bxd5 35.Nxd5 Qd6 36.Qf7 Nc5 37.Kg2 Qe6 38.Qxe6 Nxe6 39.Ne7 Nd4 40.g4 Nb5 41.Kf3 Nc3 42.Nc8 Nxa2 43.Nxa7
32/56- 01:55 354,252k 3,063k +0.63 21.b4 d5
32/56+ 02:06 387,561k 3,073k +0.73 21.b4
32/56- 02:31 467,163k 3,074k +0.54 21.b4 d5
32/60 02:39 490,529k 3,076k +0.48 21.b4 d5 22.Nc3 Bc4 23.Bb2 Nd6 24.Qf4 Rd8 25.Rad1 Na6 26.b5 Bxb5 27.Nxd5 cxd5 28.Rxd5 Bc6 29.Rxd6 Rxd6 30.Qxd6 Bxg2 31.Kxg2 Nc5 32.Re7 Rf8 33.Bd4 Kg8 34.Bxc5 bxc5 35.Qd5 Qb1 36.Rxa7 Qb6 37.Ra8 Rxa8 38.Qxa8+ Kh7 39.Qe4+ g6 40.hxg6+ fxg6 41.Qe7+ Kg8 42.Qd7 h5 43.Qd5+ Kg7 44.a4 Qb4 45.Qe5+ Kh7
33/51+ 02:45 507,957k 3,075k +0.58 21.b4
33/51+ 02:47 514,418k 3,073k +0.67 21.b4
33/51+ 02:52 526,598k 3,061k +0.82 21.b4
33/51 03:21 612,351k 3,033k +0.90 21.b4 d5 22.Nd2 Bd3 23.Bb2 Kg8 24.Re7 Nd8 25.Rae1 Bf5 26.Qe2 Ne6 27.Nb3 a5 28.b5 Bd3 29.Qg4 Qf5 30.Qxf5 Bxf5 31.Nd4 Nxd4 32.Bxd4 cxb5 33.Bxd5 Nd7 34.Bxa8 Rxa8 35.Kg2 b4 36.f3 Rd8 37.Re8+ Rxe8 38.Rxe8+ Kh7 39.Rc8 Be6 40.Rc7 Kg8
34/44- 03:46 687,411k 3,031k +0.81 21.b4 d5
34/44+ 03:55 714,128k 3,033k +0.90 21.b4
34/50- 04:11 762,986k 3,029k +0.71 21.b4 d5
34/59+ 04:22 794,070k 3,029k +0.88 21.b4
34/59 04:26 805,476k 3,027k +0.87 21.b4 d5 22.Nd2 Bd3 23.Bb2 Nd8 24.Re7 Bf5 25.Qe2 Nd7 26.Nf3 Nf6 27.Bxf6 gxf6 28.Qb2 Qg7 29.Nh4 Bh7 30.b5 cxb5 31.Bxd5 Rc8 32.Qxb5 Qg4 33.Qb2 Nc6 34.Qxf6+ Qg7 35.Qxg7+ Kxg7 36.Rb7 Nb4 37.Bb3 Nd3 38.Rxa7 Nc5 39.Re1 Nxb3 40.axb3 Rfd8
35/54- 04:49 877,580k 3,028k +0.77 21.b4 d5
35/54 05:05 923,764k 3,027k +0.83 21.b4 d5 22.Nd2 Bd3 23.Bb2 Nd8 24.Re7 Bf5 25.Qe2 Nd7 26.Nf3 Nf6 27.Bxf6 gxf6 28.Nh4 Ne6 29.Qb2 Kg8 30.b5 cxb5 31.Bxd5 Rad8 32.Bxe6 Bxe6 33.Re1 Rd6 34.Ng6 Rfd8 35.Qxb5 Bxa2 36.Rxa7 Be6 37.Kh2 Kg7 38.Qb4 b5 39.Qxb5 Rd5 40.Qe2 R5d7 41.Rxd7 Rxd7 42.Nf4
36/55- 06:16 1,143,505k 3,036k +0.73 21.b4 d5
36/56+ 06:42 1,223,880k 3,039k +0.83 21.b4
36/56 06:48 1,240,481k 3,038k +0.85 21.b4 d5 22.Nd2 Bd3 23.Bb2 Nd8 24.Re7 Bf5 25.Qe2 Nd7 26.Nf3 Bg4 27.Qd2 Nf6 28.Bxf6 gxf6 29.Nh4 Bxh5 30.Bxd5 cxd5 31.Qxd5 Nc6 32.Qxc6 Qg7 33.Rae1 Rac8 34.Qd7 Bg4 35.Qxa7 f5 36.Qxb6 f4 37.Qd6 fxg3 38.fxg3 Rcd8
37/45 07:25 1,353,909k 3,039k +0.84 21.b4 d5 22.Nd2 Bd3 23.Bb2 Nd8 24.Re7 Bf5 25.Qe2 Nd7 26.Nf3 Bg4 27.Qd2 Nf6 28.Bxf6 gxf6 29.Nh4 Bxh5 30.Bxd5 cxd5 31.Qxd5 Nc6 32.Qxc6 Qg7 33.Rae1 Rac8 34.Qd7 Bg4 35.Qxa7 f5 36.Qxb6 f4 37.Qd6 fxg3 38.fxg3 Rcd8 39.Qe5 Qxe5 40.R7xe5 Ra8
38/47- 07:52 1,437,900k 3,043k +0.75 21.b4 d5
38/51+ 08:14 1,506,413k 3,045k +0.84 21.b4
38/58+ 09:03 1,660,033k 3,054k +0.99 21.b4
38/58- 09:41 1,780,314k 3,062k +0.65 21.b4 d5
38/59+ 11:37 2,144,823k 3,075k +0.92 21.b4
38/70 11:50 2,187,874k 3,077k +0.90 21.b4 d5 22.Nc3 Bc4 23.a4 Nd8 24.b5 Ne6 25.bxc6 Nxc6 26.Nxd5 Ncd4 27.Rxe6 fxe6 28.Ne7 Rad8 29.Ng6+ Kg8 30.Bb2 Be2 31.Qh3 Rf6 32.Be4 Nf3+ 33.Bxf3 Bxf3 34.Bxf6 gxf6 35.Qxe6+ Qf7 36.Qf5 Bb7 37.Nf4 Bc8 38.Qb5 Re8 39.Rc1 Bd7 40.Qb4 Rc8 41.Ra1 Kg7 42.a5 bxa5 43.Qxa5 Bg4 44.Re1 Re8 45.Rxe8 Qxe8 46.Qxa7+ Qf7 47.Qb6 Bxh5 48.Qc5 Bg4 49.Kh2 Bf3 50.Qf5 Kg8
39/70+ 12:23 2,293,241k 3,083k +1.00 21.b4
39/70- 13:02 2,415,591k 3,085k +0.80 21.b4 d5
39/70+ 13:33 2,513,480k 3,088k +0.95 21.b4
39/70 13:48 2,559,550k 3,091k +0.83 21.b4 d5 22.Nc3 Bc4 23.a4 Na6 24.b5 Nb4 25.Ba3 c5 26.Bxb4 cxb4 27.Nxd5 Bxd5 28.Bxd5 Rab8 29.Bxb7 Rxb7 30.Qxb4 Rd8 31.Rad1 Qg8 32.Qg4 Rc7 33.Re5 Rxd1+ 34.Qxd1 Qc8 35.Qd3 Rc1+ 36.Kh2 Rc5 37.Rd5 Rxd5 38.Qxd5 Qc7 39.Qe4 Qd7 40.g4 g6 41.hxg6 Qd6+ 42.Kg2 Qxg6 43.Qd4+ Qg7 44.Qd7 Kg8 45.Qf5
40/49+ 14:38 2,716,845k 3,092k +0.92 21.b4
40/49+ 14:48 2,746,496k 3,092k +1.02 21.b4
40/76- 15:56 2,965,562k 3,101k +0.73 21.b4 d5
40/76+ 16:25 3,057,757k 3,104k +0.95 21.b4
40/76 16:48 3,132,969k 3,106k +0.87 21.b4 d5 22.Nc3 Bc4 23.a4 Nd8 24.b5 Ne6 25.bxc6 Nxc6 26.Nxd5 Ncd4 27.Rxe6 fxe6 28.Ne7 Rad8 29.Ng6+ Kg8 30.Bb2 Be2 31.Qh3 Rf6 32.Be4 Nf3+ 33.Bxf3 Bxf3 34.Bxf6 gxf6 35.Qxe6+ Qf7 36.Qf5 Bb7 37.Nf4 Bc8 38.Qb5 Qe8 39.Qb4 Bg4 40.Kh2 Bxh5 41.a5 Bf7 42.axb6 axb6 43.Qxb6 Rd2 44.Rc1 Qd8 45.Qa7 Be8 46.Rc4 f5 47.Qc5 Rd1 48.Rc1 Rxc1 49.Qxc1 Bf7 50.Qc3
41/61+ 17:48 3,320,649k 3,108k +0.97 21.b4
41/65- 18:35 3,469,904k 3,111k +0.77 21.b4 d5
41/82+ 19:06 3,570,945k 3,116k +0.92 21.b4
41/82 19:24 3,629,416k 3,117k +0.94 21.b4 d5 22.Nc3 Bc4 23.a4 Nd8 24.b5 Ne6 25.bxc6 Nxc6 26.Nxd5 Ncd4 27.Rxe6 fxe6 28.Ne7 Rad8 29.Ng6+ Kg8 30.Bb2 Be2 31.Qh3 Rf6 32.Be4 Nf3+ 33.Bxf3 Bxf3 34.Bxf6 gxf6 35.Qxe6+ Qf7 36.Qf5 Bb7 37.Nf4 Bc8 38.Qb5 Bg4 39.a5 bxa5 40.Qxa5 Rd7 41.Qc5 Rc7 42.Qd6 Rd7 43.Qc6 Rc7 44.Qa8+ Kg7 45.Qe4 Re7 46.Qb4 Rd7 47.Qc5 Rc7 48.Qa3 Kg8 49.Re1
42/64- 22:00 4,135,609k 3,132k +0.84 21.b4 d5
42/64+ 23:57 4,499,636k 3,131k +0.94 21.b4
42/64 27:09 5,108,226k 3,135k +1.00 21.b4 d5 22.Nc3 Bc4 23.a4 Qg8 24.Bb2 Na6 25.Re7 Nxb4 26.Rxb7 Nd3 27.Nd1 c5 28.Rc7 Rad8 29.Ba3 f5 30.Qh4 d4 31.Nb2 Nxb2 32.Bxb2 Bd5 33.Bxd5 Qxd5 34.Re1 Rd7 35.Rxd7 Qxd7 36.Qe7 Rd8 37.Qxd7 Rxd7 38.Kg2 c4 39.Rd1 d3 40.Kf3 Re7 41.Bc3 Kg8 42.Kf4 Kf7 43.Kxf5 Re2 44.f4 Re3 45.Be5
43/56- 32:41 6,173,524k 3,148k +0.90 21.b4 d5
43/56- 34:59 6,621,389k 3,154k +0.81 21.b4 d5
43/56+ 35:47 6,773,278k 3,154k +0.90 21.b4
43/61+ 36:21 6,881,786k 3,154k +1.11 21.b4
43/65 40:24 7,656,033k 3,158k +0.86 21.b4 d5 22.Nc3 Bc4 23.a4 Na6 24.b5 Nb4 25.Ba3 c5 26.Bxb4 cxb4 27.Nxd5 Bxd5 28.Bxd5 Rab8 29.Bxb7 Rxb7 30.Qxb4 Rc8 31.Qg4 Rd8 32.Rad1 Qg8 33.Rxd8 Qxd8 34.Rd1 Qe8 35.Qf5 Re7 36.Rd4 f6 37.Kg2 Qa8+ 38.f3 Re2+ 39.Kh3 Qe8 40.Rc4 Re5 41.Rc8 Rxf5 42.Rxe8+ Kh7 43.Kg4 Rc5 44.Kf4 Rxh5 45.Re7 Kg6 46.Rxa7 Rc5 47.Rb7 Rc4+ 48.Ke3 Rxa4
44/63+ 41:28 7,865,023k 3,160k +0.96 21.b4
44/67 42:29 8,064,287k 3,163k +0.92 21.b4 d5 22.Nc3 Bc4 23.a4 Na6 24.b5 Nb4 25.Ba3 c5 26.Bxb4 cxb4 27.Nxd5 Bxd5 28.Bxd5 Rab8 29.Bxb7 Rxb7 30.Qxb4 Rd8 31.Rad1 Qg8 32.Qg4 Rc7 33.Qf5 f6 34.Qe4 Qf8 35.Kg2 Qg8 36.Qf3 Rxd1 37.Rxd1 Qc8 38.Rd6 Rd7 39.Re6 Qb7 40.Qc6 Rc7 41.Qxb7 Rxb7 42.Kf3 Kg8 43.Rc6 Re7 44.Kf4 Kf7 45.Rc4 g6 46.Kg4 Kg7 47.f4 f5+ 48.Kh4 Re1 49.Rc7+ Kf8 50.Kh3
45/45- 47:39 9,067,980k 3,172k +0.82 21.b4 d5
45/69+ 49:32 9,439,786k 3,175k +0.92 21.b4
45/69- 52:43 10,062,044k 3,181k +0.73 21.b4 d5
45/69+ 52:59 10,112,673k 3,180k +0.89 21.b4
45/69 54:13 10,352,858k 3,182k +0.96 21.b4 d5 22.Nc3 Bc4 23.a4 Na6 24.b5 Nb4 25.Ba3 c5 26.Bxb4 cxb4 27.Nxd5 Bxd5 28.Bxd5 Rab8 29.Bxb7 Rxb7 30.Qxb4 Rd8 31.Rad1 Qg8 32.Qg4 Rc7 33.Qf5 f6 34.Qe4 Qf8 35.Kg2 Qg8 36.Qf3 Rxd1 37.Rxd1 Qc8 38.Rd6 Qb7 39.Qxb7 Rxb7 40.Kf3 Rc7 41.Ke4 Kg8 42.Rc6 Rd7 43.f4 Kf7 44.g4 Ke7 45.Kf5 Kf7 46.Rc4 Re7 47.Rc8
46/63- 56:49 10,847,963k 3,182k +0.87 21.b4 d5
46/66+ 58:52 11,251,297k 3,185k +0.96 21.b4
46/69 59:35 11,393,201k 3,187k +0.94 21.b4 d5 22.Nc3 Bc4 23.a4 Na6 24.b5 Nb4 25.Ba3 c5 26.Bxb4 cxb4 27.Nxd5 Bxd5 28.Bxd5 Rab8 29.Bxb7 Rxb7 30.Qxb4 Rd8 31.Rad1 Qg8 32.Qg4 Rxd1 33.Rxd1 Qe8 34.Qf5 Re7 35.Rd4 f6 36.Kg2 Qa8+ 37.Qf3 Qxf3+ 38.Kxf3 Kg8 39.Kg4 Kf7 40.Rc4 g6 41.f3 Kg7 42.Rc6 Rd7 43.f4 f5+ 44.Kh4 gxh5 45.Kxh5 Rd3 46.Kh4 Rd4 47.Rc7+ Kg6 48.Rxa7
47/76- 1:02:46 12,040,076k 3,196k +0.85 21.b4 d5
47/76+ 1:05:07 12,506,586k 3,201k +0.94 21.b4
47/76 1:05:25 12,567,709k 3,201k +0.94 21.b4 d5 22.Nc3 Bc4 23.a4 Na6 24.b5 Nb4 25.Ba3 c5 26.Bxb4 cxb4 27.Nxd5 Bxd5 28.Bxd5 Rab8 29.Bxb7 Rxb7 30.Qxb4 Rd8 31.Rad1 Qg8 32.Qg4 Rc7 33.Qf5 f6 34.Qe4 Rf8 35.Rd5 Rd8 36.Red1 Rxd5 37.Rxd5 Rc1+ 38.Kh2 Re1 39.Qf3 Re7 40.Rd4 Qe6 41.Kg2 Kh7 42.Qd3+ Kh8 43.Qc2 Re8 44.Qc7 Qe7 45.Qxe7 Rxe7 46.Kf3 Kg8 47.Kf4 Kf7 48.Rc4 g6 49.Rc3 gxh5 50.Kf5 Kg7
48/66+ 1:21:46 15,728,880k 3,206k +1.04 21.b4
48/66+ 1:27:27 16,808,864k 3,203k +1.13 21.b4
48/66+ 1:35:06 18,149,444k 3,180k +1.28 21.b4
48/66+ 1:45:50 20,140,154k 3,171k +1.48 21.b4
48/73 2:00:31 23,014,856k 3,183k +1.56 21.b4 d5 22.Nd2 Bd3 23.Nf3 Nd6 24.Bb2 Na6 25.Ne5 f6 26.Nxc6 Qf5 27.Qd1 Bc2 28.Qxd5 Qxd5 29.Bxd5 Rae8 30.Rxe8 Rxe8 31.Bf3 Be4 32.Bxe4 Nxe4 33.Rd1 Ng5 34.Bc1 Re2 35.Bxg5 hxg5 36.a3 Ra2 37.Rd7 Rxa3 38.Rxa7 Ra4 39.Ne7 g4 40.Nf5 b5 41.Rxg7 Nxb4 42.Rxg4 Nd3 43.Rg6 Ra1+ 44.Kg2 Ra2 45.Rh6+ Kg8 46.Rxf6 Rxf2+ 47.Kh3 Kh7 48.Rf7+ Kg8
49/73- 2:35:03 29,481,642k 3,169k +1.46 21.b4 d5
49/73- 2:39:21 30,284,056k 3,167k +1.37 21.b4 d5
49/73+ 2:45:11 31,343,681k 3,163k +1.46 21.b4

[peter]

It is clearly not amazing because it seems white can win by 21.b4

You're right, Uri, b4 would win probably too, yet Bg5 is winning faster, more surely and more beautifully.

A tactically well tuned komodo- setting plays Bg5 almost at once, so does some tactical code in CFish from Immortal Forum's "RomeoA23". Houdini Tactical takes a few minutes.

As for komodo you only have to raise Dynamism from 125 Default to 200 (still only half of Maximum).

rn3r1k/pn1p1ppq/bpp4p/7P/4N1Q1/6P1/PP3PB1/R1B1R1K1 w - - 0 1

Analysis by Komodo 12.2.2 64-bit:

21.Qf4 d5 22.Nd6 Nd7 23.Bd2 Nxd6
+/- (1.24) Depth: 7 00:00:00 1359kN
...
21.Qf4 d5
+/- (0.72 --) Depth: 15 00:00:00 5630kN
21.b4 d5 22.Nd2
+/- (0.84 ++) Depth: 15 00:00:00 5871kN
...
21.b4 d5 22.Nd2
+/- (1.20 ++) Depth: 17 00:00:01 20191kN
...
21.b4 d5 22.Nd2 Bd3 23.Bb2 a5 24.Nf3 axb4 25.Ne5 Bf5 26.Qxb4 Nd7 27.Nxc6 Nbc5 28.Bxd5 Nd3 29.Qb5 Nxe1 30.Rxe1 Nc5 31.Ne7 Bd7 32.Qxb6 Nd3 33.Be4 Nxe1 34.Bxh7 Kxh7 35.Qb3
+/- (0.93) Depth: 20 00:00:02 50557kN
...
21.b4 d5
+/= (0.65 --) Depth: 29 00:00:33 659MN
21.Bg5 f6 22.Nxf6
+/- (0.77 ++) Depth: 29 00:00:36 716MN
...
21.Bg5 f5 22.Qf4 Nc5 23.Be7 Nd3 24.Qd6 Nxe1 25.Rxe1 fxe4 26.Bxf8 Bd3 27.Bxg7+ Qxg7 28.Bxe4 Bxe4 29.Rxe4 Na6 30.Re7 Qg5 31.Rxd7 Nc5 32.Qd4+ Kg8 33.Qc4+ Kh8 34.Qc3+ Kg8 35.Rd6 Qxh5 36.b4 Re8 37.bxc5 bxc5 38.Qc4+ Kf8 39.Qf4+ Kg8 40.Kg2 Re1 41.Rd8+ Re8 42.Rd7 Qg6 43.Qf3 Qe6 44.Rxa7 Rf8 45.Qc3 Rf7 46.Rxf7
+/- (1.07) Depth: 29 00:00:42 843MN
...
21.Bg5 f5 22.Qf4 Nc5 23.Be7 Ne6 24.Qd6 fxe4 25.Bxf8 Bd3 26.Rad1 a5 27.Be7 Qf5 28.b3 Qxh5 29.Bxe4 Bxe4 30.Rxe4 Kh7 31.Re5 Qf3 32.Re3 Qf5 33.Rde1 Qd5 34.Re5 Qxd6 35.Bxd6 c5 36.Bxb8 Rxb8 37.Rd5 Rb7 38.Kg2 Kg6 39.Rd6 Kf7 40.Re3 Nd4 41.g4 Ra7 42.Kg3
+- (1.67) Depth: 30 00:00:54 1076MN
...
21.Bg5 f5 22.Qf4 Nc5 23.Be7 Ne6 24.Qd6 fxe4 25.Bxf8 Bd3 26.Be7 Qf5 27.Re3 Qxh5 28.f3 Qc5 29.Qxc5 bxc5 30.fxe4 c4 31.b3 Na6 32.bxc4 Bxc4 33.Rd1 Rb8 34.Rc3 d5 35.exd5 cxd5 36.Bxd5 Bxd5 37.Rxd5 Kh7 38.Rd6 Rb1+ 39.Kg2 Nac5 40.Re3 Rb7 41.Rc6 Rxe7 42.Rxc5 Kg6 43.Ra5 h5 44.a4 Nf4+ 45.Kf3 Ne6 46.Ree5 Kf7 47.Rf5+ Kg8 48.Rxh5
+- (1.94) Depth: 33 00:01:49 2177MN
...
21.Bg5 f5 22.Qf4 Nc5 23.Be7 Ne6 24.Qd6 fxe4 25.Bxf8 Bd3 26.Be7 Qf5 27.Rad1 a5 28.Rd2 Nc5 29.Bd8 Nba6 30.Bxb6 Qf8 31.Qxf8+ Rxf8 32.Bxa5 d5 33.Rc1 Nb7 34.Bb6 c5 35.b3 Rf6 36.Ba7 Rf8 37.Rb2 Ra8 38.Bb6 Nb4 39.a4 Ba6 40.Ra1 Nd3 41.Rc2 Rf8 42.Bh3 Kh7 43.a5 g6 44.hxg6+ Kxg6 45.Be6 Nb4 46.Rcc1 Kf6 47.Bd7
+- (1.98) Depth: 34 00:02:50 3346MN
...
21.Bg5 f5 22.Qf4 Nc5 23.Be7 Ne6 24.Qd6 fxe4 25.Bxf8 Bd3 26.Be7 Qf5 27.Rad1 a5 28.Rd2 a4 29.Re3 Kg8 30.f3 Qxh5 31.fxe4 Bc4 32.a3 Ba2 33.Bf3 Qe8 34.Bg4 c5 35.Rf3 Nc6 36.Bxe6+ Bxe6 37.Rf8+ Qxf8 38.Bxf8 Rxf8 39.Rf2 Rc8 40.Kh2 Kh7 41.Kg2 Kg8 42.Rf4 Kh7 43.Kf2 Re8 44.e5 Kg8 45.Ke3 Bb3 46.Qxd7 Rxe5+ 47.Kf2 Nd4
+- (2.03) Depth: 36 00:04:23 5203MN

That's one out of 3 trials, each one was < 65" with 24 threads of a 12x3GHz CPU, no tbs loaded, 32G hash.

[Master Om]

Leela ID 31252, engine version 19.4, can reproduce Alpha Zero move, 21. Bg5!! at 15 secs, 26k nodes in my GTX 1060 GPU. (see the link)
https://ibb.co/dXwuAL
[d]rn3r1k/pn1p1ppq/bpp4p/7P/4N1Q1/6P1/PP3PB1/R1B1R1K1 w - - 3 21

It is clearly not amazing because it seems white can win by 21.b4

On my lousy GTX 710...
[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[Analysis "Lc0 v0.19.1 CUDA"]
[AnalysisTime "59"]
[FEN "rn3r1k/pn1p1ppq/bpp4p/7P/4N1Q1/6P1/PP3PB1/R1B1R1K1 w - - 0 21"]
[SetUp "1"]

21. b4 d5 22. Bb2 dxe4 23. Bxe4 Qg8 24. a4 Nd6 25. Bg2 Nc4 26. Bc3 f6 27. b5
Bc8 28. Qf4 {(0:00:59) 5kN}{[%eval 163,8,Lc0 v0.19.1 CUDA][%meval 59s]} *

[shrapnel]

A tactically well tuned komodo- setting plays Bg5 almost at once, so does some tactical code in CFish from Immortal Forum's "RomeoA23". Houdini Tactical takes a few minutes.

All this has been done before.
Every Tom, Dick and Harry Engine claims to find some brilliant move or the other that AlphaZero played.
BUT, the key point is that no Engine is able to find all the moves that AlphaZero made, consistently.
So, none of the Engines mentioned is even a pale shadow of the mighty AlphaZero.

[peter]

BUT, the key point is that no Engine is able to find all the moves that AlphaZero made, consistently.

And what makes you think, A0 could find (or could have found, I doubt it exists anymore) all tactical difficult best moves, that SF finds immediately, at all or at least in a reasonable time, not having brought the positions of interest to the board by itself in the game?

Difficult tactical test positions solved faster by LC0 but by SF, are still rare anyhow yet, aren't they?
What's the latest results in WAC revised, to take that really easy test set once again for quick comparison, that we know some results of already from some engines including previous LC0- versions?