Complicated endgame skirmish

[Nordlandia]

[d]2br1k1r/4b2p/p1p2p2/8/6Q1/6P1/PRP2PP1/6K1 w - - 0 1

Black is certainly for preference here, though winning would not be straightforward, given his wrecked pawn structure and exposed king.

Stockfish dev at -1.5 while last leela at -0.50

[peter]

Hi Jon!

[d]2br1k1r/4b2p/p1p2p2/8/6Q1/6P1/PRP2PP1/6K1 w - - 0 1

Black is certainly for preference here, though winning would not be straightforward, given his wrecked pawn structure and exposed king.

Stockfish dev at -1.5 while last leela at -0.50

Not seeing the progress in Forward- Backward with Black Diamond (Fortess Detection code) after few first simplifications

2br1k1r/4b2p/p1p2p2/8/6Q1/6P1/PRP2PP1/6K1 w - - 0 1

Analysis by Black Diamond 090520:

1.Qh4 Kf7 2.Rb6 h5 3.Kh2 c5 4.Qc4+ Kg7 5.f4 h4 6.Qe2 hxg3+ 7.Kxg3 Kf8 8.Kf2 Rh4 9.Qe4 f5 10.Qf3 Bd6 11.g3 Rh2+ 12.Kg1 Rh6 13.Qd3 Ke7 14.Qf3 a5 15.a4 Rh3 16.Kg2 Rh7 17.Qd5 Be6 18.Qc6 Rd7 19.Ra6 Kf7 20.Rb6 Rh6 21.Rb7 Rxb7 22.Qxb7+ Be7 23.Qa8 Bc4 24.Kg1
-/+ (-0.71) Depth: 38/87 01:25:57 77233MN, tb=23099238

, I did let play out over night Cfish with White against Black Diamond with Black:

[pgn][Event "SCHWARZERBLITZ, Rapid 45m+15s"]
[Site "SchwarzerBlitz"]
[Date "2020.09.07"]
[Round "1"]
[White "Cfish 040920 64 POPCNT NUMA"]
[Black "Black Diamond 090520"]
[Result "*"]
[Annotator "-1.66;-0.83"]
[SetUp "1"]
[FEN "2br1k1r/4b2p/p1p2p2/8/6Q1/6P1/PRP2PP1/6K1 w - - 0 1"]
[PlyCount "62"]
[TimeControl "2700+15"]

1. Qh4 {[%eval -166,39] [%emt 0:04:21]} h5 {[%eval -83,27] [%emt 0:01:19]} 2.
Qc4 {[%eval -122,36] [%emt 0:02:40]} Kg7 {[%eval -62,30] [%emt 0:05:45] (c5)}
3. Rb6 {[%eval -39,38] [%emt 0:01:50] (Rb1)} c5 {[%eval -52,29] [%emt 0:02:07]
(Rd1+)} 4. Qe2 {[%eval -50,37] [%emt 0:01:44]} Rhe8 {[%eval -88,31] [%emt 0:00:
12] (Rd7)} 5. Qxh5 {[%eval -80,44] [%emt 0:03:21]} c4 {[%eval -92,34] [%emt 0:
01:24]} 6. Rc6 {[%eval -112,47] [%emt 0:02:53]} Bd6 {[%eval -91,35] [%emt 0:00:
12]} 7. Rxc4 {[%eval -107,46] [%emt 0:03:58]} Re1+ {[%eval -93,38] [%emt 0:00:
00]} 8. Kh2 {[%eval -107,28] [%emt 0:00:00]} Rh8 {[%eval -82,36] [%emt 0:00:38]
} 9. Qxh8+ {[%eval -84,52] [%emt 0:04:27]} Kxh8 {[%eval -87,39] [%emt 0:01:01]}
10. Rxc8+ {[%eval -194,51] [%emt 0:04:37]} Kg7 {[%eval -107,38] [%emt 0:03:17]}
11. Rc6 {[%eval -194,51] [%emt 0:00:00]} Re6 {[%eval -92,38] [%emt 0:00:55]}
12. f4 {[%eval -213,47] [%emt 0:02:17]} f5 {[%eval -116,39] [%emt 0:04:22]} 13.
Kg1 {[%eval -234,50] [%emt 0:00:18]} Rh6 {[%eval -112,41] [%emt 0:06:39]} 14.
Rc4 {[%eval -250,50] [%emt 0:00:07]} a5 {[%eval -121,38] [%emt 0:00:32]} 15.
Kf2 {[%eval -278,50] [%emt 0:06:31]} Rh1 {[%eval -119,44] [%emt 0:00:00]} 16.
g4 {[%eval -276,49] [%emt 0:02:55]} fxg4 {[%eval -122,44] [%emt 0:00:00]} 17.
Kg3 {[%eval -307,46] [%emt 0:03:00]} Rg1 {[%eval -122,43] [%emt 0:00:00]} 18.
c3 {[%eval -328,47] [%emt 0:04:34]} Kf6 {[%eval -122,44] [%emt 0:00:00] (Kf7)}
19. Ra4 {[%eval -337,45] [%emt 0:05:29]} Bc7 {[%eval -128,43] [%emt 0:00:19]}
20. Rc4 {[%eval -337,48] [%emt 0:01:34]} Bd8 {[%eval -128,40] [%emt 0:00:00]}
21. Rc5 {[%eval -345,45] [%emt 0:03:48] (Rc6+)} Rf1 {[%eval -135,35] [%emt 0:
00:37]} 22. Rc8 {[%eval -353,48] [%emt 0:01:48]} Ke7 {[%eval -135,39] [%emt 0:
00:00]} 23. Rc4 {[%eval -353,52] [%emt 0:06:10]} Ke6 {[%eval -140,44] [%emt 0:
00:00]} 24. Re4+ {[%eval -374,45] [%emt 0:03:04]} Kf7 {[%eval -140,41] [%emt 0:
00:00] (Kf5)} 25. Rc4 {[%eval -382,44] [%emt 0:01:56]} Ra1 {[%eval -140,43]
[%emt 0:05:45] (Ke6)} 26. Rd4 {[%eval -453,56] [%emt 0:13:45]} Bf6 {[%eval
-173,46] [%emt 0:00:00]} 27. Rd2 {[%eval -462,51] [%emt 0:02:20]} Bxc3 {[%eval
-173,40] [%emt 0:03:27]} 28. Rc2 {[%eval -470,54] [%emt 0:00:00]} Bb4 {[%eval
-178,45] [%emt 0:00:30]} 29. Kxg4 {[%eval -470,48] [%emt 0:01:05]} Rf1 {[%eval
-180,37] [%emt 0:01:41]} 30. g3 {[%eval -487,44] [%emt 0:00:47]} Bd6 {[%eval
-183,42] [%emt 0:00:00]} 31. Kf5 {[%eval -565,51] [%emt 0:18:39] (Rc6)} Rf3 {
[%eval -200,31] [%emt 0:00:32]} *
[/pgn]

Pity, GUI was set at early giving in, so Cfish's (Use NNUE Pure) eval (maybe not the best choice here neither, just forgot to change when starting) stopped it already at -5.65. Blacky was 2.00 then, (evals stored in .pgn, have a look quoting it) so that's still undecisive.
Black Diamond's output then:

[d]8/5k2/3b4/p4K2/5P2/5rP1/P1R5/8 w - - 0 1
Analysis by Black Diamond 090520:

32.Rd2 Ke7 33.Rg2 Rc3 34.Ke4 Ke6 35.Kd4 Rf3 36.Ke4 Rf1 37.Rc2 Rb1 38.Kf3 Rb4 39.Re2+ Kd5 40.Rd2+ Kc6 41.Rc2+ Kd7 42.Re2 Ra4 43.Kg4 Ra3 44.Rg2 a4 45.Kf5 Rc3 46.Ke4 Rc4+ 47.Kd5 Rc5+ 48.Kd4 Kc6 49.Re2 a3 50.Kd3 Rb5 51.Rc2+ Kd5 52.Rd2 Bc5 53.Kc3+ Kc6 54.Kc2 Rb2+ 55.Kd3 Rb8 56.Rh2 Rb4 57.Re2 Bd6 58.Ke3 Rb2 59.Kd3 Rb1 60.Rc2+ Kd5 61.Rd2 Rc1 62.Ke3+ Kc6 63.Rg2 Bc5+ 64.Kd2 Rc4 65.Re2 Bb4+ 66.Kd1 Kd5 67.f5
-+ (-1.80) Depth: 45/77 00:16:39 16455MN, tb=328198503

Guess Pawn and Bishop could be enough with the black Pawn being of the right colour against the three white Pawns, if Rooks will get traded off, but I still can't prove that to be forced. Could be a frotress still, even if Blacky doesn't judge it as such neither, problem still are the many pawn moves possible to not reach 50 moves boundary in horizon.
To my eyes it's just one more yaeeoJ (yet another endless endgame of Jon's).

Output- eval is lower then at last move of Black Diamond's in game, but the end of the output- line is won for Black.

Looking forward to further investigations regards

[peter]

Looking forward to further investigations regards

With changed colours Cfish (this time with Use NNUE Hybrid, which I just had forgotten to swich to last time) for Black's side made it much faster much clearer, even if GUI was set to giving up late this time:

[pgn][Event "SCHWARZERBLITZ, Schnellschach 45m+15s"]
[Site "SchwarzerBlitz"]
[Date "2020.09.07"]
[Round "1"]
[White "Black Diamond 090520"]
[Black "Cfish 040920 64 POPCNT NUMA"]
[Result "0-1"]
[Annotator "-0.86;-1.65"]
[SetUp "1"]
[FEN "2br1k1r/4b2p/p1p2p2/8/6Q1/6P1/PRP2PP1/6K1 w - - 0 1"]
[PlyCount "58"]
[TimeControl "2700+15"]

1. Qh4 {[%eval -86,37] [%emt 0:16:36]} Kf7 {[%eval -165,34] [%emt 0:03:10]} 2.
Rb6 {[%eval -97,33] [%emt 0:01:26]} h5 {[%eval -205,35] [%emt 0:00:00]} 3. Kh2
{[%eval -81,33] [%emt 0:02:26]} c5 {[%eval -157,36] [%emt 0:00:09]} 4. Qc4+ {
[%eval -78,31] [%emt 0:02:02]} Kg7 {[%eval -170,40] [%emt 0:00:00]} 5. Qe4 {
[%eval -74,45] [%emt 0:19:50] (Tc6)} Rhe8 {[%eval -205,34] [%emt 0:00:45]} 6.
Qa4 {[%eval -85,28] [%emt 0:00:51]} Kg6 {[%eval -221,34] [%emt 0:01:23] (Tf8)}
7. f4 {[%eval -89,35] [%emt 0:02:20] (a3)} Bf8 {[%eval -318,30] [%emt 0:00:39]}
8. Qb3 {[%eval -93,36] [%emt 0:01:21] (Dc6)} Bg7 {[%eval -391,37] [%emt 0:00:
44]} 9. Rb8 {[%eval -159,34] [%emt 0:03:18]} Be6 {[%eval -441,46] [%emt 0:00:
00]} 10. Rxd8 {[%eval -184,40] [%emt 0:02:38]} Bxb3 {[%eval -487,41] [%emt 0:
00:00]} 11. Rxe8 {[%eval -191,36] [%emt 0:02:42]} Bxa2 {[%eval -501,49] [%emt
0:00:00]} 12. Rc8 {[%eval -207,38] [%emt 0:17:22]} c4 {[%eval -510,66] [%emt 0:
00:00]} 13. Ra8 {[%eval -202,42] [%emt 0:01:00]} Bb1 {[%eval -587,43] [%emt 0:
01:04]} 14. c3 {[%eval -265,44] [%emt 0:13:56]} f5 {[%eval -614,54] [%emt 0:00:
00]} 15. Rxa6+ {[%eval -313,35] [%emt 0:05:45]} Bf6 {[%eval -678,48] [%emt 0:
02:21]} 16. Kg1 {[%eval -354,35] [%emt 0:00:31] (Ta1)} Bc2 {[%eval -707,36]
[%emt 0:00:47] (Kf7)} 17. Kf2 {[%eval -210,38] [%emt 0:05:18]} Kf7 {[%eval
-771,44] [%emt 0:00:48] (Kg7)} 18. Ra7+ {[%eval -363,36] [%emt 0:11:54]} Ke6 {
[%eval -862,45] [%emt 0:00:00] (Ke8)} 19. Ra6+ {[%eval -402,29] [%emt 0:00:50]}
Ke7 {[%eval -883,40] [%emt 0:00:00]} 20. Ra2 {[%eval -418,34] [%emt 0:02:09]}
Bb3 {[%eval -909,39] [%emt 0:00:04]} 21. Re2+ {[%eval -437,32] [%emt 0:03:03]}
Kf7 {[%eval -967,43] [%emt 0:00:00]} 22. Re3 {[%eval -452,39] [%emt 0:03:57]}
Bc2 {[%eval -1048,40] [%emt 0:00:32]} 23. Ke1 {[%eval -475,38] [%emt 0:00:54]
(Ke2)} Be4 {[%eval -1101,37] [%emt 0:00:52]} 24. Kd2 {[%eval -503,44] [%emt 0:
02:33] (Ke2)} Bxg2 {[%eval -1329,40] [%emt 0:00:55]} 25. Re1 {[%eval -525,33]
[%emt 0:00:38] (Te2)} Be4 {[%eval -1368,45] [%emt 0:00:54]} 26. Ra1 {[%eval
-646,39] [%emt 0:08:39]} h4 {[%eval -1392,58] [%emt 0:00:00]} 27. gxh4 {[%eval
-660,29] [%emt 0:01:45]} Bxh4 {[%eval -1400,45] [%emt 0:00:00]} 28. Rg1 {
[%eval -734,35] [%emt 0:05:13] (Tf1)} Bf2 {[%eval -1425,38] [%emt 0:01:03]
(Le7)} 29. Rf1 {[%eval -857,32] [%emt 0:06:36]} Bb6 {[%eval -1559,45] [%emt 0:
06:35]} 0-1
[/pgn]

[mmt]

SF12 with quite a few 7-piece TBs gets stuck at -1.67 from the depth 66 up to at least 81 indicating a draw.

81/118 5:02:29 605,000,852k 33,334k -1.67 1.Qh4 Kf7 2.Rb6 h5 3.Kh2 c5 4.Qc4+ Kg7 5.Qe2 Rhe8 6.Rb3 Bd6 7.Re3 Rh8 8.Rd3 Rde8 9.Re3 Rxe3 10.Qxe3 h4 11.f4 hxg3+ 12.Kxg3 Kf7 13.a4 f5 14.Qf3 Rh6 15.Qa8 Bd7 16.Qd5+ Ke7 17.Qg8 Re6 18.Qg5+ Ke8 19.Qg8+ Bf8 20.Kf2 Rh6 21.a5 Be6 22.Qg5 Bc8 23.Kf1 Bd7 24.Qg8 Be6 25.Qg5 Rh1+ 26.Ke2 Kd7 27.Qg3 Bc4+ 28.Kd2 Rh6 29.Kc1 Kc7 30.Qc3 Be6 31.Qe5+ Kc8 32.g4 fxg4 33.Qe4 Kd8 34.f5 Bd7 35.Qxg4 Rf6 36.Qh4 Be7 37.Qh8+ Kc7 38.Qg7 Bd8 39.Qg3+ Kc8 40.Qf3 Rc6 41.Qf4 Bf6 42.Kd2 Bd4 43.Qe4 Bg7 44.Qd5 Bf6 45.Qg8+ Kb7 46.Qd5 Kc7 47.Qe4 Rd6+ 48.Kc1 Bc3 49.Qa8 Rc6 50.Qa7+ Kd8 51.Qb8+ Bc8 52.Qg3 Bf6 53.Qf3 Rd6 54.Qf4 Be7 55.Qg4 Rf6 56.Qg8+ Kd7 57.Qg5 Rd6 58.Qg7 Bb7 59.Qg8 Be4