Warm your engines

xr_a_y · Post by **xr_a_y** » Fri Jan 10, 2020 9:41 pm

In a TCEC match oposing PeSTO and Topple, this position occured

[d] 2b1rrkb/2p4p/qp4pP/p1n5/P1PBp1N1/2P3PB/Q3P3/3R1RK1 w - - 4 30

And the 256 threads Stockfish of TCEC (aka redfish) scored it +8

After that, PeSTO won the game but understand the threats only 8 moves after SF.

What your engine says ?

peter · Post by **peter** » Fri Jan 10, 2020 10:59 pm

xr_a_y wrote: ↑Fri Jan 10, 2020 9:41 pm What your engine says ?

[d]2b1rrkb/2p4p/qp4pP/p1n5/P1PBp1N1/2P3PB/Q3P3/3R1RK1 w - - 0 1
Analysis by Stockfish 040120 64 POPCNT:

1. +- (10.80): 3.Bxh8 Bxg4 4.Bxg4 Kxh8 5.Qd2 Qxc4 6.Qg5 Kg8 7.Kg2 Rxf1 8.Rxf1 e3 9.Rf6 Ne4 10.Qf4 Nd6 11.Qxc4+ Nxc4 12.Be6+ Rxe6 13.Rxe6 c5 14.Rf6 Nb2 15.Rxb6 Nxa4 16.Rb8+ Kf7 17.Rb7+ Kf6 18.Rxh7 Kg5 19.c4 Nc3 20.Kf3 Na2 21.Rc7 Kxh6 22.Rxc5 Nb4 23.Rxa5 Kg7 24.Ra4 Nc6 25.Kxe3 Ne7 26.Ra6 Kf8 27.Kf4 Ke8 28.e4 Kd8 29.e5 Kc7 30.Ra7+ Kd8 31.e6 Nc8 32.Rd7+ Ke8 33.c5 Ne7 34.Ke5 Kf8

2. +- (2.72): 3.Qd2 Rxf1+ 4.Rxf1 e3 5.Qd1 Qxc4 6.Bxc5 bxc5 7.Rf4 Qa2 8.Qd3 Bf5 9.Rxf5 gxf5 10.Bg2 Kf8 11.Qxf5+ Qf7 12.Qxc5+ Re7 13.Bf3 Qxf3 14.exf3 e2 15.Qxe7+ Kxe7 16.Kf2 Bxc3 17.Kxe2 Kf7 18.Ke3 Kg6 19.Kf4 c5 20.Ke4 Be1 21.Ne5+ Kxh6 22.g4 c4 23.Nxc4 Kg5 24.Ne5 Bg3 25.Nd7 Bh2 26.Nf8 h6 27.Ne6+ Kf6 28.Nd4 Kg5 29.Nc6 Bc7 30.Ne5 Kf6 31.f4 Ke6 32.Nc6 Kf6 33.Nd4 Bd6 34.Kf3 Bc7 35.Nb5 Bb8 36.Ke4 Kg6 37.Nd4 Kf6 38.Nf5 Kg6 39.Ne7+ Kf6 40.Nd5+ Ke6 41.f5+ Kf7 42.Kd4 Kg7 43.Kc5 Bg3 44.Nc3 Be1 45.Ne4

Depth 46 in MV2 mode after about 15 minutes at 24 threads of 12x3GHz CPU, 32G hash, no tbs loaded.
Some other moves might be good enough yet to win for White too, guess PeSTO and or Topple simply will have needed some more time and depth to be as sure about it as SF here already is.

peter · Post by **peter** » Fri Jan 10, 2020 11:48 pm

peter wrote: ↑Fri Jan 10, 2020 10:59 pm 1. +- (10.80): 3.Bxh8 Bxg4 4.Bxg4 Kxh8 5.Qd2 Qxc4 6.Qg5 Kg8 7.Kg2 Rxf1 8.Rxf1 e3 9.Rf6 Ne4 10.Qf4 Nd6 11.Qxc4+ Nxc4 12.Be6+ Rxe6 13.Rxe6 c5 14.Rf6 Nb2 15.Rxb6 Nxa4 16.Rb8+ Kf7 17.Rb7+ Kf6 18.Rxh7 Kg5 19.c4 Nc3 20.Kf3 Na2 21.Rc7 Kxh6 22.Rxc5 Nb4 23.Rxa5 Kg7 24.Ra4 Nc6 25.Kxe3 Ne7 26.Ra6 Kf8 27.Kf4 Ke8 28.e4 Kd8 29.e5 Kc7 30.Ra7+ Kd8 31.e6 Nc8 32.Rd7+ Ke8 33.c5 Ne7 34.Ke5 Kf8

After MV2 pondering above, I did some Backward of the first one line from 13th move, this time with 6men Syzygys. Here's MV1- output after that, time counter restarted with already full hash at board- position:

2b1rrkb/2p4p/qp4pP/p1n5/P1PBp1N1/2P3PB/Q3P3/3R1RK1 w - - 0 1

Analysis by Stockfish 040120 64 POPCNT:

3.Bxh8 Bxg4 4.Bxg4 Kxh8 5.Qd2 Qxc4 6.Qg5 Kg8 7.Kg2 e3 8.Rd4 Ne4 9.Rxf8+ Kxf8 10.Qxe3 Qc6 11.Qf3+ Qf6 12.Rxe4 Qxf3+ 13.Kxf3 Rb8 14.Bd7 Ra8 15.Bb5 Rc8 16.Ba6 Rd8 17.Bc4 Rd1 18.Rf4+ Ke8 19.Bf7+ Ke7 20.Bg8 Rd8 21.Rf7+ Kd6 22.Rg7 Ke5 23.Kg4 Kf6 24.Rf7+ Ke5 25.Bxh7 Rh8 26.Kg5 Kd5 27.Rg7 Kc4 28.Bg8+ Kxc3 29.Rxc7+ Kd2 30.h7 Kxe2 31.Kg4 Ke1 32.Rb7 Kf2 33.Rxb6 Ke1 34.Rb5 Kf2 35.Rxa5 g5 36.Rc5 Kg1 37.Rb5 Kf2 38.a5
+- (13.93) Depth: 45/79 00:25:25 39015MN, tb=7466904

Eelco de Groot · Post by **Eelco de Groot** » Sat Jan 11, 2020 10:15 am

I still only have my old Athlon running so to compare I can try some very old programs, that are maybe more comparable to the programs playing in the game. Only 32 bit engines, because the operating system is 32 bit.

I tried my Rebel 12 Betazoid personality and it finds 1. Bxh8, but at first with a second move that is not accurate, maybe for other programs finding 2.Bxg4 is also a bit harder than the first move. Rebel 12 finds the first move and the second move 2.Bxg4 correctly at depth 17 although it would also play the first move for a short while at depth 14, failing low at depth 15. At depth 17 the score is only even, 0.00.

Rebel Betazoid III

00:00:17.0 -0,29 1 103 Rxf8+ Rxf8 Bxc5 bxc5
00:00:17.0 -0,25 1 126 Bxh8 Kxh8
00:00:17.0 0,38 1 292 Bxc5 Rxf1+ Rxf1 Bxg4 Bxg4 bxc5
00:00:17.0 0,40 1 335 Bf6
00:00:17.0 0,57 1 360 Rf4
00:00:17.0 0,57 1 376 Kh2
00:00:17.4 0,01 2 657 Kh2 Bf5 Bxc5 bxc5
00:00:18.0 0,16 2 1387 Bxc5 bxc5 Qb3 Bxg4 Bxg4
00:00:18.1 0,07 3 3197 Bxc5 bxc5 Qd2 Bf5
00:00:18.2 -0,22 4 10771 Bxc5 bxc5 Qb3 Rxf1+ Rxf1 Bf5
00:00:18.2 -0,21 4 12806 Kh2 Rxf1 Rxf1 Bf5 Bxc5 bxc5
00:00:18.2 -0,30 5 42618 Kh2 Bf5 Ne3 Bxh3 Kxh3 Qc8+ Ng4
00:00:18.2 -0,25 5 53393 Bxc5 bxc5 Qb3 Bxg4 Bxg4 Rb8 Rxf8+ Rxf8
00:00:18.3 -0,39 6 152122 Bxc5 bxc5 Qb3 Be6 Kh2 Rxf1 Rxf1
00:00:18.3 -0,30 6 181687 Kh2 Bf5 Ne3 Bxh3 Kxh3 Qc8+ Ng4
00:00:18.4 -0,39 7 430028 Kh2 Be6 Ne3 Bxh3 Kxh3 Qc8+ Ng4 Rd8 Bxc5
00:00:18.9 -0,44 8 1343716 Kh2 Be6 Ne3 Bxh3 Kxh3 Qc8+ Kh2 Be5 Bxe5 Rxe5
00:00:21.2 -0,35 9 3777221 Kh2 Rd8 e3 Bf5 Rb1 Ne6 c5
00:00:25.3 -0,49 10 7957600 Kh2 Rd8 Bxc5 bxc5 Rxd8 Rxd8 Qc2 Bxg4 Bxg4 Qxc4 Qc1 e3
00:00:27.7 -0,35 10 10416920 Rxf8+ Rxf8 Rf1 Bf5 Bxh8 Kxh8 Ne3 Qc8 Bxf5 gxf5 Nd5 Rg8
00:00:29.6 -0,40 11 12560217 Rxf8+ Rxf8 Rf1 Bf5 Bxh8 Kxh8 Ne3 Qc8 Nxf5 gxf5 Qd2 Rd8 Qg5
00:00:42.8 -0,39 12 26914228 Rxf8+ Rxf8 Rf1 Rxf1+ Kxf1 Qa8 Bxc5 bxc5 Qd2 Ba6
00:01:12.4 -0,28 13 61180047 Rxf8+ Rxf8 Rf1 Rxf1+ Kxf1 Qa8 Bxc5 bxc5 Qd2 Ba6
00:02:13.1 -0,18 14 131140506 Rxf8+ Rxf8 Rf1 Rxf1+ Kxf1 Qa8 Bxc5 bxc5 Qd2 Bf5 Nf2 Bxh3+
00:03:16.0 -0,07 14 210619923 Bxh8 Bxg4 Bxg4 Kxh8
00:04:14.3 -0,40 15 282209990 Bxh8 Bxg4 Rxf8+ Rxf8 Bg7 Bxh3 Bxf8 Kxf8 Rd8+ Ke7 Qd2
00:05:33.9 -0,25 15 378838696 Rxf8+ Rxf8 Qd2 Nb3 Qa2 Nxd4 cxd4 c5 d5
00:07:00.7 -0,20 15 479219775 Kh2 Rxf1 Rxf1 Bxg4 Bxg4 Qa7
00:21:08.9 -0,02 16 1520218609 Kh2 e3 Bxe3 Be6 Bxc5 bxc5
00:53:21.2 -0,16 17 3924718724 Kh2 Rxf1 Rxf1 Bf5 Bxh8 Kxh8
01:06:36.1 -0,15 17 574651632 Rxf8+ Rxf8 Qd2 Nb3 Qg5
01:08:57.3 0,00 17 747675729 Bxh8 Bxg4 Bxg4 Kxh8 Bd7 Rd8 Rxf8+ Rxf8

There is also Pro Deo 1.1 installed, a 2005 program that is playing here with a tactical personality, with souped up King Safety at 405 and high Attacking at 450. This is more succesful in finding the first move Bxh8 after just 14.1 seconds and keeping it but with an incorrect second move Rxf8+

Pro Deo 1.1 Q1d7e Tactical Engine

00:00:00.1 -0,31 1 112 Rxf8+ Rxf8 Bxc5 bxc5
00:00:00.1 -0,11 1 153 Bxh8 Kxh8
00:00:00.1 1,53 1 321 Bxc5 Rxf1+ Rxf1 Bxg4 Bxg4 bxc5
00:00:00.1 2,12 1 399 Bf6
00:00:00.1 2,66 1 424 Rf4
00:00:00.2 2,68 1 440 Kh2
00:00:00.2 0,12 2 903 Kh2 Bf5
00:00:00.2 1,53 2 4757 Bxc5 Rxf1+ Rxf1 Bxg4 Bxg4 bxc5
00:00:00.2 0,38 3 8271 Bxc5 bxc5 Qd2 Bf5
00:00:00.2 0,51 3 11657 Qd2 Rxf1+ Rxf1 Bf5 Bxc5
00:00:00.2 -0,32 4 19397 Qd2 Nxa4 Nf6+ Bxf6 Bxc8
00:00:00.2 0,38 4 19932 Bxc5 bxc5 Qd2 Bf5
00:00:00.2 -0,14 5 36238 Bxc5 bxc5 Qd2 Bf5 Qg5 Bxc3
00:00:00.2 -0,13 5 54702 Qd2 Qxc4 Bg7 Bxg7 hxg7 Rxf1+ Rxf1 Bxg4 Bxg4
00:00:00.3 0,00 5 94769 Bg7 Bxg4 Bxg4 Bxg7 hxg7 Rxf1+ Rxf1 Rd8 e3
00:00:00.4 -0,05 6 180416 Bg7 Bxg7 hxg7 Rxf1+ Rxf1 Bxg4 Bxg4 Rd8 e3 h5 Bh3
00:00:00.6 -0,05 7 393354 Bg7 Bxg7 hxg7 Rxf1+ Rxf1 Bxg4 Bxg4 Rd8 e3 h5 Bh3
00:00:01.2 -0,05 8 1120865 Bg7 Bxg7 hxg7 Rxf1+ Rxf1 Bxg4 Bxg4 e3 Rf6 Qa8 Rf3
00:00:03.1 0,00 9 3304822 Bg7 Bxg7 hxg7 Kxg7 Qd2 Bxg4 Qd4+ Kh6 Bxg4 Qa8 Qe3+ Kg7 Qd4+ Kh6 Qe3+ Kg7 Qd4+
00:00:08.7 0,21 10 10130425 Bg7 Bxg7 hxg7 Rxf1+ Rxf1 Bxg4 Bxg4 e3 Bf3 Kxg7 Bd5 Kh6 Rf7 Ne4
00:00:14.1 0,21 10 16851733 Bxh8 <-Fail High at depth 10, first move found!
00:00:14.5 0,45 10 17235696 Bxh8 Bxg4 Rxf8+ Rxf8 Bg7 Bxh3 Bxf8 Kxf8 Rd8+ Ke7 Qd2 Ne6 Rb8
00:00:17.8 0,60 11 21301285 Bxh8 Bxg4 Rxf8+ Rxf8 Bg7 Qc8 Bxf8 Kxf8 Bg2 Ke8 Rd5 c6 Re5+
00:00:43.2 1,07 12 52498696 Bxh8 Kxh8 Qd2 Qxc4 Rxf8+ Rxf8 Ne3 Qf7 Qd4+ Kg8 Rf1 Bxh3 Rxf7 Rxf7 Qd8+ Rf8 Qe7 Rf7 Qe8+ Rf8
00:01:22.1 1,44 13 101912896 Bxh8 Bxg4 Rxf8+ Rxf8 Bg7 Bxh3 Bxf8 Ne6 Be7 c5 Kh2 Bf5 Bf6 e3
00:03:10.6 1,19 14 240896615 Bxh8 Bxg4 Rxf8+ Rxf8 Bg7 Bxh3 Bxf8 Kxf8 Qd2 Ne6 Qd7
00:11:27.6 1,20 15 817060851 Bxh8 Bxg4 Rxf8+ Rxf8 Bg7
00:39:42.5 1,05 16 2363101160 Bxh8 Bxg4 Rxf8+ Rxf8 Bg7

After now giving 1.Bxh8 Bxg4, Pro Deo Tactical Q1d7e finally sees that 2.Rxf8+ only leads to something drawish, and finally finds 2. Bxg4! with a good score of 1,16 pawns, not yet a winning score but not so bad for a 2005 32 bitty engine!

00:00:00.1 -1,08 1 124 Rxf8+ Rxf8 Bxg4 Kxh8
00:00:00.1 -0,49 1 137 Bxg4 Kxh8
00:00:00.1 0,67 2 543 Bxg4 Rxf1+ Rxf1 Kxh8 Rf7
00:00:00.1 -0,24 3 2115 Bxg4 Kxh8 Rf4 Rxf4 gxf4 e3 Qb1 Qxc4 Qd3 Nxd3
00:00:00.1 0,00 4 7386 Bxg4 Kxh8 Qd2 Rxf1+ Rxf1 Qxc4 Qf4 Rg8 Qxc7
00:00:00.2 -0,13 5 20209 Bxg4 Kxh8 Rc1 Nb7 c5 Nxc5
00:00:00.2 -0,05 5 22136 Rxf8+ Rxf8 Bg7 Qc8 Bxf8 Bxh3 Bxc5 bxc5 Qd2 Qg4 Qd8+ Kf7 Qxc7+ Kf6 Rd8
00:00:00.2 -1,28 6 38114 Rxf8+ Rxf8 Bxg4 Kxh8 Kh1 Kg8 e3
00:00:00.2 -0,29 6 72678 Bxg4 Kxh8 e3 Qa8 Rf4 Rxf4 gxf4 Kg8
00:00:00.4 -0,63 7 206719 Bxg4 Kxh8 Kh1 c6 Qd2 Rxf1+ Rxf1 Qxc4 Rf6 Nxa4
00:00:00.4 -0,63 7 239175 Bg7
00:00:00.4 0,12 7 268110 Bg7 Bxh3 Bxf8 Bxf1 Bxc5 Bxe2 Rd7 Bxc4
00:00:00.5 0,14 8 412182 Bg7 Rxf1+ Bxf1 c6 Bg2 Qa7
00:00:00.6 0,14 8 456764 Rxf8+
00:00:00.6 1,00 8 512470 Rxf8+ Rxf8 Bg7 Bxh3 Bxf8 Ne6 Be7
00:00:00.7 1,05 9 623224 Rxf8+ Rxf8 Bg7 Bxh3 Bxf8 Ne6 Ba3 Qc8 Be7 c6 c5 Bf1
00:00:01.0 0,57 10 996766 Rxf8+ Rxf8 Bg7 Bxh3 Bxf8 e3 Bxc5 Qa8 Rd5 bxc5 Qb3 Be6 Kg2
00:00:03.3 0,97 11 3487969 Rxf8+ Rxf8 Bg7 Bxh3 Bxf8 e3 Rd8 Kf7 Bxc5 bxc5 Kh2 Qf6 Rd1 Bg4 Kh1 Bf3+
00:00:05.2 0,97 12 5928005 Rxf8+ Rxf8 Bg7 Bxh3 Bxf8 e3 Rd8 Kf7 Bxc5 bxc5 Kh2 Qf6 Rd1 Bg4 Kh1 Bf3+
00:00:14.6 0,92 13 17514904 Rxf8+ Rxf8 Bg7 Bxh3 Bxf8 Kxf8 Rd8+ Ke7 Qd2 Ne6 Rh8
00:00:49.6 1,05 14 60108460 Rxf8+ Rxf8 Bg7 Bxh3 Bxf8 Kxf8 Rd8+ Ke7 Qd2 Qxc4 Rh8 Ne6
00:05:21.3 0,26 15 363743113 Rxf8+ Rxf8 Bg7 Bxh3 Bxf8 <- Fail Low
00:35:13.3 0,47 16 2131174918 Rxf8+ Rxf8 Bg7 Bxh3 Bxf8
01:05:24.4 0,47 16 4179662679 Bxg4
02:05:42.5 0,80 16 3873227745 Bxg4 Kxh8 Qd2 Qxc4 Qg5
04:37:45.2 1,16 17 615679911 Bxg4 Kxh8 Qd2 Qxc4 Qg5

I have not tried any other Pro Deo 1.1 personality or the default, so it could be some are better. There are literally hundreds of different personalities for Pro Deo 1.1 with all the different switches that Ed made, I don't know if one really was a noticeable improvement on the default Pro Deo personality or on something like Q3 as a tactical positions only setting. I liked the Singular extension Switches but sadly that did not make it in the final Pro Deo, Ed could only make it work in tactics but not to gain Elo, so it was dropped.

xr_a_y · Post by **xr_a_y** » Sat Jan 11, 2020 11:07 am

A simpler, but still pretty one from Marvin PeSTO game

[d] 1k1r2nr/pp1qn3/3p2p1/3Np1b1/4Pp1p/5P1P/PPPQNBP1/R2R2K1 w - - 6 20

where Bxa7 is a win

OneTrickPony · Post by **OneTrickPony** » Sat Jan 11, 2020 12:09 pm

Leela after 20 seconds with Sergio net:
1. 15 [+89.87] 30.Bxh8 Bxg4 31.Bxg4 Kxh8 32.Qd2 Qxc4 33.Qg5 Kg8 34.Kh2 c6 35.Rxf8+ Rxf8 36.Rd6 Qf7 37.Rxc6 Qf2+ 38.Kh3 Qf1+ 39.Kh4 Qh1+ 40.Bh3 e3 41.Rxg6+ hxg6 42.Qxg6+ Kh8 43.Qg7#
2. 15 [+70.61] 30.Kh2 e3 31.Rxf8+ Rxf8 32.Bxe3 Be6 33.Bxc5 bxc5 34.Qd2 Qxc4 35.Ne3 Qe4 36.Bg2 Qe5
3. 15 [+69.86] 30.Rxf8+ Rxf8 31.Bxh8 Bxg4 32.Bxg4 Kxh8 33.Qd2 Qxc4 34.Qg5 Qf7 35.Qe5+ Kg8 36.Bh3 Re8 37.Qd4
4. 15 [+62.80] 30.Qd2 Nb3 31.Qa2 Nxd4 32.cxd4 c5 33.d5 Bf5 34.Kg2 Qc8 35.Nf2 Bd4
5. 15 [+66.77] 30.Kg2 Qa8 31.Ne3 Bxh3+ 32.Kxh3 Qc8+ 33.Kg2 Qe6 34.Nd5 Be5 35.Qd2 c6
6. 15 [+67.07] 30.Rb1 Bf5 31.Bxh8 Kxh8 32.Qd2 Qxc4 33.Ne3 Nb3 34.Qb2 Qc5 35.c4+ Nd4 36.Rbd1 Rd8

It wants 30.Bxh8 instantly but starts with about 78% score which then goes up.

xr_a_y · Post by **xr_a_y** » Sun Jan 12, 2020 10:28 am

Another one, from Minic iCE game seems pretty sharp

https://lichess.org/2MyRcPV7#46

[d] 2rr1k2/5Ppp/1p6/p2B4/n7/4P3/5PPP/R4RK1 w - - 1 24

Here Minic played Bb3, that was probably a bad decision ...

Reanalyzing this position at home with more time, Minic goes for Bb7 but never stick to Be6 that is SF suggestion here to old the position...

peter · Post by **peter** » Sun Jan 12, 2020 5:06 pm

xr_a_y wrote: ↑Sun Jan 12, 2020 10:28 am [d] 2rr1k2/5Ppp/1p6/p2B4/n7/4P3/5PPP/R4RK1 w - - 1 24

Here Minic played Bb3, that was probably a bad decision ...

Reanalyzing this position at home with more time, Minic goes for Bb7 but never stick to Be6 that is SF suggestion here to old the position...

24.Be6, Rxa4 and Bb7 seem to be playable. Maybe in that order as for safeness to draw.

Net 49920 at fresh start:

[d]2rr1k2/5Ppp/1p6/p2B4/n7/4P3/5PPP/R4RK1 w - - 0 1

Analysis by Lc0 v0.23.0 RTX2080Ti syzygy:

24.Be6 Rc6 25.Rxa4 Rxe6 26.Rb1 Rd2 27.g4 Rf6 28.h4 Kxf7 29.Rc4 Rfxf2 30.Rxb6 Rg2+ 31.Kf1 Rdf2+ 32.Ke1 h6 33.Rc7+ Kg8 34.Rbb7 Ra2 35.Rxg7+ Kh8 36.Rh7+ Kg8 37.Rhg7+ Kf8 38.Rgf7+ Ke8 39.Kf1 Rgd2 40.Kg1 Rg2+ 41.Kf1 Rgd2 42.Kg1 Rd1+ 43.Rf1 Rdd2 44.Rff7
= (-0.18) Depth: 17/48 00:00:43 4171kN, tb=480

After some Forward- Backward of a corresponding line and 24.Be6:

[d]2rr1k2/5Ppp/1p2B3/p7/n7/4P3/5PPP/R4RK1 b - - 0 1

Analysis by Lc0 v0.23.0 RTX2080Ti syzygy:

24...Rc6 25.Rxa4 Rxe6 26.Rb1 Rd2 27.g4 Rf6 28.h4 Kxf7 29.Rc4 Rfxf2 30.Rxb6 Rg2+ 31.Kf1 Rdf2+ 32.Ke1 h6 33.Rc7+ Kg8 34.Rbb7 Ra2 35.Rxg7+ Kf8 36.Rgf7+ Ke8 37.Kf1 Rgd2 38.Kg1 a4 39.Rbe7+ Kd8 40.Ra7 Ke8 41.g5 hxg5 42.hxg5 Rd1+ 43.Rf1 Rdd2 44.Rb1 Rg2+ 45.Kf1 Rgf2+
= (-0.16) Depth: 20/49 00:01:44 13093kN, tb=4019

After another line from and back to position after 24.Bb7

[d]2rr1k2/1B3Ppp/1p6/p7/n7/4P3/5PPP/R4RK1 b - - 0 1

Analysis by Lc0 v0.23.0 RTX2080Ti syzygy:

24...Rc4 25.Rfb1 Rb4 26.f3 Nc3 27.Rxb4 axb4 28.Be4 Nxe4 29.fxe4 b3 30.Rb1 Rd3 31.Kf2 Rc3 32.Ke2 b5 33.Kd2 b4 34.Rf1 Rc2+ 35.Kd3 Rc3+ 36.Kd2 Rc2+ 37.Kd3 Rxg2 38.e5 b2 39.e6 Rf2 40.Rb1 Rxh2 41.Kd4 Rc2 42.Kd5 Ke7 43.Rf1 Rc8 44.Rb1 Rc2 45.Rf1 Rc8 46.Rb1 Rd8+ 47.Ke5 Rd2 48.Rf1 Rd8 49.Rb1 Rb8 50.Rxb2 Rb6 51.Kf5 g6+ 52.Kf4 Rxe6 53.Rxb4 Kxf7 54.e4 Rf6+ 55.Ke5 g5 56.Kd5 h5 57.e5 Rf1 58.Rb7+ Kg6 59.Rb6+ Kg7 60.Rb7+ Rf7 61.Rb8 h4 62.e6
=/+ (-0.57) Depth: 41/78 00:02:40 10379kN, tb=36529

And after 24.Rxa4:

[d]2rr1k2/5Ppp/1p6/p2B4/R7/4P3/5PPP/5RK1 b - - 0 1

Analysis by Lc0 v0.23.0 RTX2080Ti syzygy:

24...Rxd5 25.g3 Rdc5 26.Kg2 Rc1 27.Rxc1 Rxc1 28.f4 Kxf7 29.Kf3 Ke7 30.e4 Rc3+ 31.Ke2 Rc2+ 32.Ke3 Rxh2 33.Rc4 Kd8 34.Rd4+ Ke8 35.Rc4 b5 36.Rc5 Rb2 37.Rc8+ Kd7 38.Ra8 a4 39.e5 Rb3+ 40.Ke4 a3 41.Kd5 Rd3+ 42.Kc5 Rxg3 43.f5 Rc3+ 44.Kxb5 h5 45.e6+ Kd6 46.Rd8+
= (-0.22) Depth: 19/51 00:03:13 18289kN, tb=147

And then some 3MV- output of Crystal's after Backward of all of the three later LC0- lines, at 3x12GHz, 32G hash, 6 men Syzygys in depth 50/79 after about 30' from new start after Backward to board position:

2rr1k2/5Ppp/1p6/p2B4/n7/4P3/5PPP/R4RK1 w - - 0 1

Analysis by Crystal 040120 64 POPCNT:

1. = (0.00): 24.Be6 Rc6 25.Rxa4 Rxe6 26.g4 Rd2 27.Rb1 Kxf7 28.Rc4 h6 29.h4 Rf6 30.f4 Rfd6 31.Rc7+ Kg8 32.g5 a4 33.Ra7 Ra2 34.f5 Rdd2 35.g6 Kf8 36.Rf7+ Ke8 37.Rxg7 Rg2+ 38.Kf1 Raf2+ 39.Ke1 Rc2 40.Rg8+ Kd7 41.Kf1 Rcf2+ 42.Ke1

2. = (0.00): 24.Rxa4 Rxd5 25.g3 Ra8 26.Rfa1 Rb5 27.Kg2 Kxf7 28.g4 h5 29.gxh5 Rxh5 30.h4 Re8 31.Rd1 Re6 32.Rd7+ Re7 33.Rd6 Rh6 34.Rd5 Rhe6 35.Kf3 Re5 36.Rd6 Rb7 37.Kg4 Re8 38.Rd5 Ra8 39.Rb5 Ke8 40.e4 Kd7 41.Rd5+ Ke7 42.Rg5 Ke6 43.Rb5 Kd6 44.Rd5+ Ke6

3. = (0.00): 24.Bb7 Rc4 25.Rfb1 Rb4 26.f3 Nc5 27.Bc6 Rd2 28.Be8 Ra2 29.Rxa2 Rxb1+ 30.Kf2 Nd3+ 31.Kg3 Rb2 32.Ra1 Ne5 33.Rc1 Nxf7 34.Bxf7 Kxf7 35.Rc7+ Kf6 36.Ra7 h5 37.h4 g6 38.f4 Rb4 39.Kf3 Rb3 40.Ra8 Kf5 41.g3 Rb4 42.e4+ Ke6 43.Ke3 Rb3+ 44.Kf2 Kf7 45.e5 Ke7 46.Ra7+ Ke6 47.Ra8

Warm your engines

Warm your engines

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