Top 2 Engines find flaw in this 1959 Chess puzzle

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Chessqueen
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Top 2 Engines find flaw in this 1959 Chess puzzle

Post by Chessqueen »

Viktor Alexandrovich Evreinov won this chess composition back in 1959 White to Play and win, but if you give it to the top 2 chess engines, it will refute the win finding a flaw :roll:

NOTE: he is missing a Black pawn on the a file, that is why Stockfish found a flaw
This is the correct position https://www.google.com/search?q=Viktor+ ... =955&dpr=1

[pgn][Event "Computer chess game"]
[Date "2023.07.24"]
[Round "?"]
[White "Stockfish-windows-x86-64-avx2"]
[Black "Dragon-3.2-64bit-avx2"]
[Result "*"]
[Time "19:07:12"]
[TimeControl "0+5"]
[SetUp "1"]
[FEN "6bk/7p/2q1PP2/2Pp4/p2R4/5K2/8/B7 w - - 0 1"]
[Termination "unterminated"]
[PlyCount "0"]
[WhiteType "program"]
[BlackType "program"][/pgn]
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Nordlandia
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Re: Top 2 Engines find flaw in this 1959 Chess puzzle

Post by Nordlandia »

Is it table engine draw related as ny SF on my phone suggest clear edge with winning score.
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Ajedrecista
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Re: Top 2 engines find flaw in this 1959 chess puzzle.

Post by Ajedrecista »

Hello:

SUPERB STUDY! SF 16 thinks 1.- Re4 is the only move to win; people with faster hardware and better analysis skills would find checkmate in around 21 moves from the starting position of the study. 3.- ..., h5 offers more resistance to the checkmate, but it is unavoidable. 7.- ..., h5 and 7.- ..., h6 delay the checkmate one move from the proposed solution (8.- f8=Q+, Kh7; 9.- Qxg7#), but the whole point of the study is incredible. This is the PGN taken from Arves:

[pgn][Event "1.p"]
[Site ""]
[Date "1959"]
[Round ""]
[White "Viktor Evreinov"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "6bk/7p/2q1PP2/2Pp4/p2R4/5K2/8/B7 w - - 0 1"]
[PlyCount "15"]
[EventDate "1959"]

1. Re4 $1 (1. f7 $2 Bxf7 2. Rg4+ d4+ 3. Kf2 Qxc5 4. Bxd4+ Qxd4+ 5. Rxd4 Bxe6 $11) 1... dxe4+ 2. Kg2 $1 (2. Kg3 $2 Bf7 $1 3. exf7 Qc7+ $19) 2... e3+ 3. Kg1 $1 Bf7 $1 (3... h5 4. f7+ Kh7 5. f8=Q Qc7 6. Qf5+ Kh6 7. Qf6+ Kh7 8. Qh8+ $18) 4. exf7 Qxc5 5. f8=Q+ Qxf8 6. f7+ Qg7+ 7. Kh2 $1 Qxa1 8. f8=Q# 1-0[/pgn]

This study can be found at YACPDB, which mentions some reprints. I found the Swedish reprint in the magazine Tidskrift för Schack of February, 1975, pages 60 and 61, Study No. 1741:

https://tfsarkiv.schack.se/pdf/1975/tfs_1975_02.pdf
Tidskrift för Schack wrote:[...]

Av ännu högre "karathalt" är 1741, där inte bara inledningsdraget utan även slutdraget (och för all del även det som händer mellan dessa) är högst överraskande. Vit ligger materiellt under, men den utsatta svarta kungen och den mot honom riktade "bazookan" i form av halvbatteriet med T och B i avdragsposition ger vit en del chanser. Det gäller bara (!) at kunna tillvarata dessa: 1. Te4!! Rakt i slag och dessutom med schack – vad skall det vara bra för? 1. — dxe4† 2. Kg2! Den fräcke kungen går inte ens ur skottlinjen för vits dambatteri. 2. — e3† 3. Kg1! Först nu är vit fredad för schackar. 3. — Lf7! Parerar matthotet 4. f7†, men efter 4. exf7 uppstår ett nytt matthot på f8. Detta pareras med 4. — Dxc5, men 5. f8D† Dxf8 6. f7† Dg7†. Utan schack på den vita kungen hade svart blivit matt med 7. f8D, men nu? 7. Kh2!! Det överraskande slutdraget. Svart är ställd. 7. — Dxa1 8. f8DX. En pärla av renaste vatten!

[...]

------------------------

[...]

Of even higher "carat content" is 1741, where not only the opening move but also the final move (and by all means also what happens between these) is most surprising. White is materially inferior, but the exposed black king and the "bazooka" aimed at him in the form of the half-battery with R and P in retreat position give White some chances. It's just a matter (!) of being able to take advantage of these: 1. Ke4!! Straight to the point and also with chess – what is it supposed to be good for? 1. — dxe4+ 2. Kg2! The impudent king does not even go out of the firing line of white's queen battery. 2. — e3+ 3. Kg1! Only now is white protected for chess. 3. — Bf7! Stops the checkmate threat 4. f7+, but after 4. exf7 a new checkmate threat arises on f8. This is matched by 4. — Qxc5, but 5. f8=D+ Qxf8 6. f7+ Qg7+. Unchecked on the white king, Black would have gone checkmate with 7. f8=D, but now? 7. Kh2!! The surprising ending. Black is set. 7. — Dxa1 8. f8=D#. A pearl of purest water!

[...]
------------

I also found a reprint in The Washington Post of May 25th, 1998 (the end of the chess article):

https://www.washingtonpost.com/archive/ ... 2ad9e6fcd/
The Washington Post wrote:[...] Solution to the study by V. Evreinov (White: Kf3,Rd4,Ba1,P:c5,e6,f6; Black: Kh8,Qc6,Bg8,P:a4,d5,h7):1.Re4!! dxe4+2.Kg2 e3+ 3.Kg1 Bf7! 4.exf7 Qxc5 5.f8Q+ Qxf8 6.f7+ Qg7+ 7.Kh2! Qxa1 8.f8Q mate.
------------

Last but not least, the Wikipedia article about Evreinov in Russian language says that this study also appears in the FIDE Album 1959-1961 published in 1966.

Regards from Spain.

Ajedrecista.
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Ajedrecista
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Re: Top 2 engines find flaw in this 1959 chess puzzle.

Post by Ajedrecista »

Hello again:
Ajedrecista wrote: ↑Tue Jul 25, 2023 8:34 pm[...]

SUPERB STUDY! SF 16 thinks 1.- Re4 is the only move to win; people with faster hardware and better analysis skills would find checkmate in around 21 moves from the starting position of the study. 3.- ..., h5 offers more resistance to the checkmate, but it is unavoidable. [...]
SF 16 thinks that this cool study is a checkmate in 20 moves just with infinite analysis:

Code: Select all

FEN: 6bk/7p/2q1PP2/2Pp4/p2R4/5K2/8/B7 w - - 0 1

Stockfish_16-windows-x86-64-modern:
Found 145 tablebases
NNUE evaluation using nn-5af11540bbfe.nnue enabled
[...] 34/16	00:05	   1.190.310	243.516	 0,00	f6f7 Bg8xf7 e6xf7 Kh8g7 Rd4f4+ d5d4+ Kf3f2 Kg7f8 Ba1xd4 Qc6h6 Bd4e5 Qh6h2+ Kf2f3 Qh2h1+ Kf3f2
 35/16	00:05	   1.343.554	248.714	 0,00	f6f7 Bg8xf7 e6xf7 Kh8g7 Rd4f4+ d5d4+ Kf3f2 Kg7f8 Ba1xd4 Qc6h6 Bd4e5 Qh6h2+ Kf2f3 Qh2h1+ Kf3f2
 36/27+	00:06	   1.785.978	278.146	+0,03	Rd4e4
 36/27+	00:07	   1.957.648	281.109	+0,08	Rd4e4
 36/27+	00:11	   3.198.731	283.123	+6,04	Rd4e4
 36/36	00:12	   3.690.873	308.420	+6,97	Rd4e4 d5xe4+ Kf3g2 h7h5 f6f7+ Kh8h7 f7f8Q e4e3+ Kg2g1 Qc6b7 Qf8f5+ Kh7h6 Qf5f6+ Kh6h7 e6e7 Qb7b1+ Kg1h2 Qb1xa1 Qf6xa1 Bg8f7 Qa1xa4 e3e2 Qa4e4+ Kh7g8 Qe4g2+ Kg8h8
 37/32+	00:14	   5.865.124	401.500	+7,32	Rd4e4
 37/32+	00:15	   6.911.406	447.137	+8,21	Rd4e4
 37/36+	00:18	  12.828.187	687.617	+41,41	Rd4e4
 37/40	00:19	  13.331.374	698.599	+45,32	Rd4e4 d5xe4+ Kf3g2 h7h5 f6f7+ Kh8h7 f7f8Q e4e3+ Kg2g1 Qc6c7 Qf8f5+ Kh7h6 Qf5f6+ Kh6h7 Qf6h8+ Kh7g6 Qh8xg8+ Kg6f5 Qg8f7+ Qc7xf7 e6xf7 Kf5e6 f7f8Q e3e2 Qf8e8+ Ke6d5 Qe8xe2 Kd5c6 Qe2e8+ Kc6b7 c5c6+ Kb7b6 Qe8e3+ Kb6a6 Qe3e2+ Ka6b6
 38/42+	00:19	  13.569.094	706.502	+80,66	Rd4e4
 38/56	00:23	  15.845.805	690.358	+199,65	Rd4e4 d5xe4+ Kf3g2 h7h5 f6f7+ Kh8h7 f7f8Q e4e3+ Kg2g1 Qc6c7 Qf8f5+ Kh7h6 Qf5f6+ Kh6h7 Qf6h8+ Kh7g6 Qh8xg8+ Kg6f5 Qg8f7+ Qc7xf7 e6xf7 Kf5e6 f7f8Q e3e2 Qf8e8+ Ke6d5 Qe8xe2 Kd5c6 Qe2e8+ Kc6d5 Qe8xa4 Kd5e6 Qa4e8+ Ke6d5 Qe8xh5+ Kd5c6 Ba1d4 Kc6b5 c5c6+ Kb5xc6
 39/55	00:24	  17.720.737	729.518	+199,67	Rd4e4 d5xe4+ Kf3g2 h7h5 f6f7+ Kh8h7 f7f8Q e4e3+ Kg2g1 Qc6c7 Qf8f5+ Kh7h6 Qf5f6+ Kh6h7 Qf6h8+ Kh7g6 Qh8xg8+ Kg6f5 Qg8f7+ Qc7xf7 e6xf7 Kf5e6 f7f8Q e3e2 Kg1f2 e2e1Q+ Kf2xe1 Ke6d5 c5c6 Kd5xc6 Qf8e8+ Kc6d5 Qe8xa4 Kd5c5
 40/62	00:34	  29.452.817	846.053	+199,89	Rd4e4 Qc6xc5 f6f7+ d5d4 Ba1xd4+ Qc5xd4 f7xg8Q+ Kh8xg8 Re4xd4 Kg8f8 Rd4xa4 Kf8e7 Ra4a7+ Ke7f6 Ra7xh7 Kf6xe6
 41/18	00:35	  30.154.436	855.202	+199,89	Rd4e4 Qc6xc5 f6f7+ d5d4 Ba1xd4+ Qc5xd4 f7xg8Q+ Kh8xg8 Re4xd4 Kg8f8 Rd4xa4 Kf8e7 Ra4a7+ Ke7f6 Ra7xh7 Kf6xe6
 42/40	00:37	  35.589.882	942.903	+M20	Rd4e4 d5xe4+ Kf3g2 h7h5 f6f7+ Kh8h7 f7f8Q e4e3+ Kg2g1 Qc6c7 Qf8f5+ Kh7h6 Qf5f6+ Kh6h7 Qf6h8+ Kh7g6 Qh8xg8+ Kg6f5 Qg8f7+ Qc7xf7 e6xf7 Kf5e6 f7f8Q e3e2 Kg1f2 Ke6d5 Qf8d6+ Kd5c4 c5c6 Kc4b3 c6c7 Kb3a2 c7c8Q e2e1Q+ Kf2xe1 Ka2xa1 Qc8c1+ Ka1a2 Qd6a3+
[...]
 94/40	12:19	1.465.329.945	1.982.720	+M20	Rd4e4 d5xe4+ Kf3g2 h7h5 f6f7+ Kh8h7 f7f8Q e4e3+ Kg2g1 Qc6c7 Qf8f5+ Kh7h6 Qf5f6+ Kh6h7 Qf6h8+ Kh7g6 Qh8xg8+ Kg6f5 Qg8f7+ Qc7xf7 e6xf7 Kf5e6 f7f8Q e3e2 Kg1f2 Ke6d5 Qf8d6+ Kd5c4 c5c6 Kc4b3 c6c7 Kb3a2 c7c8Q e2e1Q+ Kf2xe1 Ka2xa1 Qc8c1+ Ka1a2 Qd6a3+
There were 44,034,624 TB hits to the full set of 3, 4 and 5-man Syzygy EGTB.

Regards from Spain.

Ajedrecista.
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acase
Posts: 998
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Full name: Andrew R Case

Re: Top 2 engines find flaw in this 1959 chess puzzle.

Post by acase »

Ajedrecista wrote: ↑Wed Jul 26, 2023 9:18 pm Hello again:
Ajedrecista wrote: ↑Tue Jul 25, 2023 8:34 pm[...]

SUPERB STUDY! SF 16 thinks 1.- Re4 is the only move to win; people with faster hardware and better analysis skills would find checkmate in around 21 moves from the starting position of the study. 3.- ..., h5 offers more resistance to the checkmate, but it is unavoidable. [...]
SF 16 thinks that this cool study is a checkmate in 20 moves just with infinite analysis:

Code: Select all

FEN: 6bk/7p/2q1PP2/2Pp4/p2R4/5K2/8/B7 w - - 0 1

Stockfish_16-windows-x86-64-modern:
Found 145 tablebases
NNUE evaluation using nn-5af11540bbfe.nnue enabled
[...] 34/16	00:05	   1.190.310	243.516	 0,00	f6f7 Bg8xf7 e6xf7 Kh8g7 Rd4f4+ d5d4+ Kf3f2 Kg7f8 Ba1xd4 Qc6h6 Bd4e5 Qh6h2+ Kf2f3 Qh2h1+ Kf3f2
 35/16	00:05	   1.343.554	248.714	 0,00	f6f7 Bg8xf7 e6xf7 Kh8g7 Rd4f4+ d5d4+ Kf3f2 Kg7f8 Ba1xd4 Qc6h6 Bd4e5 Qh6h2+ Kf2f3 Qh2h1+ Kf3f2
 36/27+	00:06	   1.785.978	278.146	+0,03	Rd4e4
 36/27+	00:07	   1.957.648	281.109	+0,08	Rd4e4
 36/27+	00:11	   3.198.731	283.123	+6,04	Rd4e4
 36/36	00:12	   3.690.873	308.420	+6,97	Rd4e4 d5xe4+ Kf3g2 h7h5 f6f7+ Kh8h7 f7f8Q e4e3+ Kg2g1 Qc6b7 Qf8f5+ Kh7h6 Qf5f6+ Kh6h7 e6e7 Qb7b1+ Kg1h2 Qb1xa1 Qf6xa1 Bg8f7 Qa1xa4 e3e2 Qa4e4+ Kh7g8 Qe4g2+ Kg8h8
 37/32+	00:14	   5.865.124	401.500	+7,32	Rd4e4
 37/32+	00:15	   6.911.406	447.137	+8,21	Rd4e4
 37/36+	00:18	  12.828.187	687.617	+41,41	Rd4e4
 37/40	00:19	  13.331.374	698.599	+45,32	Rd4e4 d5xe4+ Kf3g2 h7h5 f6f7+ Kh8h7 f7f8Q e4e3+ Kg2g1 Qc6c7 Qf8f5+ Kh7h6 Qf5f6+ Kh6h7 Qf6h8+ Kh7g6 Qh8xg8+ Kg6f5 Qg8f7+ Qc7xf7 e6xf7 Kf5e6 f7f8Q e3e2 Qf8e8+ Ke6d5 Qe8xe2 Kd5c6 Qe2e8+ Kc6b7 c5c6+ Kb7b6 Qe8e3+ Kb6a6 Qe3e2+ Ka6b6
 38/42+	00:19	  13.569.094	706.502	+80,66	Rd4e4
 38/56	00:23	  15.845.805	690.358	+199,65	Rd4e4 d5xe4+ Kf3g2 h7h5 f6f7+ Kh8h7 f7f8Q e4e3+ Kg2g1 Qc6c7 Qf8f5+ Kh7h6 Qf5f6+ Kh6h7 Qf6h8+ Kh7g6 Qh8xg8+ Kg6f5 Qg8f7+ Qc7xf7 e6xf7 Kf5e6 f7f8Q e3e2 Qf8e8+ Ke6d5 Qe8xe2 Kd5c6 Qe2e8+ Kc6d5 Qe8xa4 Kd5e6 Qa4e8+ Ke6d5 Qe8xh5+ Kd5c6 Ba1d4 Kc6b5 c5c6+ Kb5xc6
 39/55	00:24	  17.720.737	729.518	+199,67	Rd4e4 d5xe4+ Kf3g2 h7h5 f6f7+ Kh8h7 f7f8Q e4e3+ Kg2g1 Qc6c7 Qf8f5+ Kh7h6 Qf5f6+ Kh6h7 Qf6h8+ Kh7g6 Qh8xg8+ Kg6f5 Qg8f7+ Qc7xf7 e6xf7 Kf5e6 f7f8Q e3e2 Kg1f2 e2e1Q+ Kf2xe1 Ke6d5 c5c6 Kd5xc6 Qf8e8+ Kc6d5 Qe8xa4 Kd5c5
 40/62	00:34	  29.452.817	846.053	+199,89	Rd4e4 Qc6xc5 f6f7+ d5d4 Ba1xd4+ Qc5xd4 f7xg8Q+ Kh8xg8 Re4xd4 Kg8f8 Rd4xa4 Kf8e7 Ra4a7+ Ke7f6 Ra7xh7 Kf6xe6
 41/18	00:35	  30.154.436	855.202	+199,89	Rd4e4 Qc6xc5 f6f7+ d5d4 Ba1xd4+ Qc5xd4 f7xg8Q+ Kh8xg8 Re4xd4 Kg8f8 Rd4xa4 Kf8e7 Ra4a7+ Ke7f6 Ra7xh7 Kf6xe6
 42/40	00:37	  35.589.882	942.903	+M20	Rd4e4 d5xe4+ Kf3g2 h7h5 f6f7+ Kh8h7 f7f8Q e4e3+ Kg2g1 Qc6c7 Qf8f5+ Kh7h6 Qf5f6+ Kh6h7 Qf6h8+ Kh7g6 Qh8xg8+ Kg6f5 Qg8f7+ Qc7xf7 e6xf7 Kf5e6 f7f8Q e3e2 Kg1f2 Ke6d5 Qf8d6+ Kd5c4 c5c6 Kc4b3 c6c7 Kb3a2 c7c8Q e2e1Q+ Kf2xe1 Ka2xa1 Qc8c1+ Ka1a2 Qd6a3+
[...]
 94/40	12:19	1.465.329.945	1.982.720	+M20	Rd4e4 d5xe4+ Kf3g2 h7h5 f6f7+ Kh8h7 f7f8Q e4e3+ Kg2g1 Qc6c7 Qf8f5+ Kh7h6 Qf5f6+ Kh6h7 Qf6h8+ Kh7g6 Qh8xg8+ Kg6f5 Qg8f7+ Qc7xf7 e6xf7 Kf5e6 f7f8Q e3e2 Kg1f2 Ke6d5 Qf8d6+ Kd5c4 c5c6 Kc4b3 c6c7 Kb3a2 c7c8Q e2e1Q+ Kf2xe1 Ka2xa1 Qc8c1+ Ka1a2 Qd6a3+
There were 44,034,624 TB hits to the full set of 3, 4 and 5-man Syzygy EGTB.

Regards from Spain.

Ajedrecista.
Hello Jesus,

Stockfish 9 agrees:

Code: Select all

FEN: 6bk/7p/2q1PP2/2Pp4/p2R4/5K2/8/B7 w - - 0 1

Stockfish_9_x64_bmi2:
 1/1	00:00	 2k	381k	 0.00	1.f6-f7
 2/2	00:00	 5k	955k	+2.37	1.f6-f7 a4-a3
 3/3	00:00	 7k	1,361k	+7.00	1.f6-f7 a4-a3 2.f7-f8Q
 4/5	00:00	 22k	3,719k	-1.95	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ Kg7-f8
 5/6	00:00	 24k	3,999k	-1.95	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ Kg7-f8
 6/7	00:00	 27k	4,459k	-1.70	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2
 7/8	00:00	 29k	4,839k	-1.09	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8
 8/12	00:00	 33k	5,436k	+1.55	1.f6-f7 Bg8xf7 2.e6xf7 Qc6-a8 3.f7-f8R+ Qa8xf8+ 4.Rd4-f4+ Kh8-g8 5.Rf4xf8+ Kg8xf8 6.c5-c6 Kf8-e7
 9/13	00:00	 36k	6,067k	+2.51	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Qc6-c8 5.f7-f8Q+ Qc8xf8 6.Ba1xd4+ Kg7-g8
 10/20	00:00	 192k	17,464k	-0.44	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6
 11/22	00:00	 511k	25,553k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-f3 Qg5-d5+ 8.Kf3-g3 Qd5-g5+ 9.Kg3-f3
 12/18	00:00	 583k	26,479k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-f3 Qg5-d5+ 8.Kf3-g3 Qd5-g5+ 9.Kg3-f3
 13/18	00:00	 654k	27,249k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-f3 Qg5-d5+ 8.Kf3-g3 Qd5-g5+ 9.Kg3-f3
 14/18	00:00	 726k	27,939k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-f3 Qg5-d5+ 8.Kf3-g3 Qd5-g5+ 9.Kg3-f3
 15/18	00:00	 799k	28,553k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-f3 Qg5-d5+ 8.Kf3-g3 Qd5-g5+ 9.Kg3-f3
 16/18	00:00	 872k	29,081k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-f3 Qg5-d5+ 8.Kf3-g3 Qd5-g5+ 9.Kg3-f3
 17/18	00:00	 952k	29,764k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-f3 Qg5-d5+ 8.Kf3-g3 Qd5-g5+ 9.Kg3-f3
 18/18	00:00	 981k	29,724k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-f3 Qg5-d5+ 8.Kf3-g3 Qd5-g5+ 9.Kg3-f3
 19/18	00:00	 999k	30,286k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-f3 Qg5-d5+ 8.Kf3-g3 Qd5-g5+ 9.Kg3-f3
 20/18	00:00	 1,022k	30,062k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-f3 Qg5-d5+ 8.Kf3-g3 Qd5-g5+ 9.Kg3-f3
 21/18	00:00	 1,163k	30,601k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-f3 Qg5-d5+ 8.Kf3-g3 Qd5-g5+ 9.Kg3-f3
 22/18	00:00	 1,292k	31,501k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-f3 Qg5-d5+ 8.Kf3-g3 Qd5-g5+ 9.Kg3-f3
 23/18	00:00	 2,761k	34,092k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-f3 Qg5-d5+ 8.Kf3-g3 Qd5-g5+ 9.Kg3-f3
 24/18	00:00	 3,210k	34,515k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-f3 Qg5-d5+ 8.Kf3-g3 Qd5-g5+ 9.Kg3-f3
 25/18	00:00	 4,167k	35,315k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-f3 Qg5-d5+ 8.Kf3-g3 Qd5-g5+ 9.Kg3-f3
 26/18	00:00	 4,620k	35,537k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-f3 Qg5-d5+ 8.Kf3-g3 Qd5-g5+ 9.Kg3-f3
 27/18	00:00	 6,483k	36,216k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-f3 Qg5-d5+ 8.Kf3-g3 Qd5-g5+ 9.Kg3-f3
 28/18	00:00	 7,165k	36,368k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-f3 Qg5-d5+ 8.Kf3-g3 Qd5-g5+ 9.Kg3-f3
 29/60	00:01	 65,293k	43,968k	+M63	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-h8+ Kh6-g5 11.Qh8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Qf8-e8+ Ke4-d5 17.Qe8xe2 Kd5xc5 18.Qe2xh5+ Kc5-b6 19.Ba1-d4+ Kb6-c6 20.Qh5-e8+ Kc6-d5 21.Qe8-d7+ Kd5-e4 22.Qd7xa4 Ke4-f3 23.Bd4-a1 Kf3-g3 24.Qa4-d7
 30/58	00:01	 72,192k	44,317k	+M40	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-h8+ Kh6-g5 11.Qh8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Qf8-e8+ Ke4-d5 17.Qe8xh5+ Kd5-c6 18.Qh5xe2 Kc6xc5 19.Qe2-a6 Kc5-b4 20.Ba1-f6 Kb4-c5 21.Bf6-e7+ Kc5-d5 22.Qa6xa4 Kd5-e6 23.Qa4-e8 Ke6-f5 24.Qe8-d7+ Kf5-e4 25.Kg1-f2 Ke4-e5 26.Qd7-d6+ Ke5-e4 27.Qd6-e6+ Ke4-d4 28.Qe6-g6 Kd4-c3 29.Qg6-c6+ Kc3-b2
 31/48	00:01	 72,891k	44,338k	+M24	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-f8+ Kh6-g5 11.Qf8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 Ke4-d5 18.Qf8-d6+ Kd5-e4 19.Qd6-e5+ Ke4-f3 20.Qe5-f5+ Kf3-e3 21.c5-c6 h5-h4 22.c6-c7 a4-a3 23.c7-c8Q a3-a2 24.Qc8-c3+
 32/48	00:01	 77,226k	44,383k	+M24	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-f8+ Kh6-g5 11.Qf8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 h5-h4 18.Qf8-e8+ Ke4-d5 19.c5-c6 Kd5-d6 20.Qe8-d7+ Kd6-c5 21.c6-c7 Kc5-c4 22.c7-c8Q+ Kc4-b3 23.Qc8-c3+ Kb3-a2 24.Qc3-b2+
 33/48	00:01	 78,810k	44,425k	+M24	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-f8+ Kh6-g5 11.Qf8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 h5-h4 18.Qf8-e8+ Ke4-d5 19.c5-c6 Kd5-d6 20.Qe8-d7+ Kd6-c5 21.c6-c7 Kc5-c4 22.c7-c8Q+ Kc4-b3 23.Qc8-c3+ Kb3-a2 24.Qc3-b2+
 34/48	00:01	 79,020k	44,418k	+M24	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-f8+ Kh6-g5 11.Qf8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 h5-h4 18.Qf8-e8+ Ke4-d5 19.c5-c6 Kd5-d6 20.Qe8-d7+ Kd6-c5 21.c6-c7 Kc5-c4 22.c7-c8Q+ Kc4-b3 23.Qc8-c3+ Kb3-a2 24.Qc3-b2+
 35/48	00:01	 80,571k	44,441k	+M24	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-f8+ Kh6-g5 11.Qf8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 h5-h4 18.Qf8-e8+ Ke4-d5 19.c5-c6 Kd5-d6 20.Qe8-d7+ Kd6-c5 21.c6-c7 Kc5-c4 22.c7-c8Q+ Kc4-b3 23.Qc8-c3+ Kb3-a2 24.Qc3-b2+
 36/48	00:01	 83,740k	44,495k	+M24	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-f8+ Kh6-g5 11.Qf8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 h5-h4 18.Qf8-e8+ Ke4-d5 19.c5-c6 Kd5-d6 20.Qe8-d7+ Kd6-c5 21.c6-c7 Kc5-c4 22.c7-c8Q+ Kc4-b3 23.Qc8-c3+ Kb3-a2 24.Qc3-b2+
 37/48	00:01	 88,895k	44,738k	+M23	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-f8+ Kh6-g5 11.Qf8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 h5-h4 18.c5-c6 h4-h3 19.Ke1-e2 Ke4-d5 20.c6-c7 h3-h2 21.c7-c8Q a4-a3 22.Qc8-d7+ Kd5-c4 23.Qd7-d3+
 38/46	00:02	 94,015k	44,812k	+M23	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-h8+ Kh6-g5 11.Qh8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 a4-a3 18.c5-c6 Ke4-d5 19.c6-c7 Kd5-c4 20.c7-c8Q+ Kc4-b3 21.Qc8-c3+ Kb3-a2 22.Qc3-c2+ Ka2xa1 23.Qf8xa3+
 39/46	00:02	 97,956k	44,852k	+M23	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-h8+ Kh6-g5 11.Qh8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 a4-a3 18.c5-c6 Ke4-d5 19.c6-c7 Kd5-c4 20.c7-c8Q+ Kc4-b3 21.Qc8-c3+ Kb3-a2 22.Qc3-c2+ Ka2xa1 23.Qf8xa3+
 40/46	00:02	 102,870k	44,921k	+M23	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-h8+ Kh6-g5 11.Qh8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 a4-a3 18.c5-c6 Ke4-d5 19.c6-c7 Kd5-c4 20.c7-c8Q+ Kc4-b3 21.Qc8-c3+ Kb3-a2 22.Qc3-c2+ Ka2xa1 23.Qf8xa3+
 41/46	00:02	 119,341k	45,411k	+M23	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-f8+ Kh6-g5 11.Qf8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 a4-a3 18.c5-c6 Ke4-d5 19.c6-c7 Kd5-c4 20.c7-c8Q+ Kc4-b3 21.Qc8-c3+ Kb3-a2 22.Qc3-c2+ Ka2xa1 23.Qf8xa3+
 42/46	00:02	 125,342k	45,562k	+M23	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-f8+ Kh6-g5 11.Qf8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 Ke4-d5 18.Qf8-d6+ Kd5-c4 19.c5-c6 a4-a3 20.c6-c7 Kc4-b5 21.c7-c8Q Kb5-a4 22.Qc8-c4+ Ka4-a5 23.Qd6-c5+
 43/46	00:02	 130,671k	45,657k	+M23	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-f8+ Kh6-g5 11.Qf8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 Ke4-d5 18.Qf8-d6+ Kd5-c4 19.c5-c6 a4-a3 20.c6-c7 Kc4-b5 21.c7-c8Q Kb5-a4 22.Qc8-c4+ Ka4-a5 23.Qd6-c5+
 44/46	00:03	 143,737k	45,893k	+M23	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-f8+ Kh6-g5 11.Qf8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 Ke4-d5 18.Qf8-d6+ Kd5-c4 19.c5-c6 a4-a3 20.c6-c7 Kc4-b5 21.c7-c8Q Kb5-a4 22.Qc8-c4+ Ka4-a5 23.Qd6-c5+
 45/46	00:03	 153,721k	46,135k	+M23	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-f8+ Kh6-g5 11.Qf8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 Ke4-d5 18.Qf8-d6+ Kd5-c4 19.c5-c6 a4-a3 20.c6-c7 Kc4-b5 21.c7-c8Q Kb5-a4 22.Qc8-c4+ Ka4-a5 23.Qd6-c5+
 46/46	00:03	 165,345k	46,250k	+M23	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-f8+ Kh6-g5 11.Qf8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 Ke4-d5 18.Qf8-d6+ Kd5-c4 19.c5-c6 a4-a3 20.c6-c7 Kc4-b5 21.c7-c8Q Kb5-a4 22.Qc8-c4+ Ka4-a5 23.Qd6-c5+
 47/46	00:04	 194,847k	46,861k	+M23	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-f8+ Kh6-g5 11.Qf8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.f7-f8Q e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 Ke4-d5 18.Qf8-d6+ Kd5-c4 19.c5-c6 a4-a3 20.c6-c7 Kc4-b5 21.c7-c8Q Kb5-a4 22.Qc8-c4+ Ka4-a5 23.Qd6-c5+
 48/46	00:04	 211,036k	47,201k	+M23	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-f8+ Kh6-g5 11.Qf8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.c5-c6 e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 h5-h4 18.f7-f8Q h4-h3 19.Ke1-e2 Ke4-d5 20.c6-c7 h3-h2 21.c7-c8Q a4-a3 22.Qc8-d7+ Kd5-c4 23.Qd7-d3+
 49/46	00:04	 236,514k	47,627k	+M23	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-h6 10.Qg8-f8+ Kh6-g5 11.Qf8-f6+ Kg5-g4 12.Qf6-g6+ Kg4-f4 13.Qg6-f7+ Qb7xf7 14.e6xf7 Kf4-e4 15.c5-c6 e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 h5-h4 18.f7-f8Q h4-h3 19.Ke1-e2 Ke4-d5 20.c6-c7 h3-h2 21.c7-c8Q a4-a3 22.Qc8-d7+ Kd5-c4 23.Qd7-d3+
 50/46	00:11	 580,395k	51,064k	+M20	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-c7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-f5 10.Qg8-f7+ Qc7xf7 11.e6xf7 Kf5-e6 12.f7-f8Q e3-e2 13.Qf8-d6+ Ke6-f5 14.Qd6-e5+ Kf5-g4 15.Qe5xe2+ Kg4-f4 16.Kg1-f2 Kf4-f5 17.Qe2-e5+ Kf5-g4 18.Qe5-d5 a4-a3 19.Ba1-f6 Kg4-f4 20.Qd5-f3+
 51/40	00:11	 586,997k	51,088k	+M20	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-c7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-f5 10.Qg8-f7+ Qc7xf7 11.e6xf7 Kf5-e6 12.f7-f8Q e3-e2 13.Qf8-d6+ Ke6-f5 14.Qd6-e5+ Kf5-g4 15.Qe5xe2+ Kg4-f4 16.Kg1-f2 Kf4-f5 17.Qe2-e5+ Kf5-g4 18.Qe5-d5 a4-a3 19.Ba1-f6 Kg4-f4 20.Qd5-f3+
 52/40	00:11	 610,256k	51,119k	+M20	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-c7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-f5 10.Qg8-f7+ Qc7xf7 11.e6xf7 Kf5-e6 12.f7-f8Q e3-e2 13.Qf8-d6+ Ke6-f5 14.Qd6-e5+ Kf5-g4 15.Qe5xe2+ Kg4-f4 16.Kg1-f2 Kf4-f5 17.Qe2-e5+ Kf5-g4 18.Qe5-d5 a4-a3 19.Ba1-f6 Kg4-f4 20.Qd5-f3+
 53/40	00:13	 674,050k	51,282k	+M20	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-c7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-f5 10.Qg8-f7+ Qc7xf7 11.e6xf7 Kf5-e6 12.f7-f8Q e3-e2 13.Qf8-d6+ Ke6-f5 14.Qd6-e5+ Kf5-g4 15.Qe5xe2+ Kg4-f4 16.Kg1-f2 Kf4-f5 17.Qe2-e5+ Kf5-g4 18.Qe5-d5 a4-a3 19.Ba1-f6 Kg4-f4 20.Qd5-f3+
 54/40	00:14	 736,249k	51,332k	+M20	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-c7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-f5 10.Qg8-f7+ Qc7xf7 11.e6xf7 Kf5-e6 12.f7-f8Q e3-e2 13.Qf8-d6+ Ke6-f5 14.Qd6-e5+ Kf5-g4 15.Qe5xe2+ Kg4-f4 16.Kg1-f2 Kf4-f5 17.Qe2-e5+ Kf5-g4 18.Qe5-d5 a4-a3 19.Ba1-f6 Kg4-f4 20.Qd5-f3+
 55/40	00:14	 737,177k	51,332k	+M20	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-c7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-f5 10.Qg8-f7+ Qc7xf7 11.e6xf7 Kf5-e6 12.f7-f8Q e3-e2 13.Qf8-d6+ Ke6-f5 14.Qd6-e5+ Kf5-g4 15.Qe5xe2+ Kg4-f4 16.Kg1-f2 Kf4-f5 17.Qe2-e5+ Kf5-g4 18.Qe5-d5 a4-a3 19.Ba1-f6 Kg4-f4 20.Qd5-f3+
 56/40	00:15	 781,829k	51,582k	+M20	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-c7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-f5 10.Qg8-f7+ Qc7xf7 11.e6xf7 Kf5-e6 12.f7-f8Q e3-e2 13.Qf8-d6+ Ke6-f5 14.Qd6-e5+ Kf5-g4 15.Qe5xe2+ Kg4-f4 16.Kg1-f2 Kf4-f5 17.Qe2-e5+ Kf5-g4 18.Qe5-d5 a4-a3 19.Ba1-f6 Kg4-f4 20.Qd5-f3+
 57/40	00:15	 801,062k	51,668k	+M20	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-c7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-f5 10.Qg8-f7+ Qc7xf7 11.e6xf7 Kf5-e6 12.f7-f8Q e3-e2 13.Qf8-d6+ Ke6-f5 14.Qd6-e5+ Kf5-g4 15.Qe5xe2+ Kg4-f4 16.Kg1-f2 Kf4-f5 17.Qe2-e5+ Kf5-g4 18.Qe5-d5 a4-a3 19.Ba1-f6 Kg4-f4 20.Qd5-f3+
 58/40	00:16	 862,197k	51,852k	+M20	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-c7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-f5 10.Qg8-f7+ Qc7xf7 11.e6xf7 Kf5-e6 12.f7-f8Q e3-e2 13.Qf8-d6+ Ke6-f5 14.Qd6-e5+ Kf5-g4 15.Qe5xe2+ Kg4-f4 16.Kg1-f2 Kf4-f5 17.Qe2-e5+ Kf5-g4 18.Qe5-d5 a4-a3 19.Ba1-f6 Kg4-f4 20.Qd5-f3+
 59/40	00:17	 904,495k	51,914k	+M20	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-c7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-f5 10.Qg8-f7+ Qc7xf7 11.e6xf7 Kf5-e6 12.f7-f8Q e3-e2 13.Qf8-d6+ Ke6-f5 14.Qd6-e5+ Kf5-g4 15.Qe5xe2+ Kg4-f4 16.Kg1-f2 Kf4-f5 17.Qe2-e5+ Kf5-g4 18.Qe5-d5 a4-a3 19.Ba1-f6 Kg4-f4 20.Qd5-f3+
 60/40	00:19	 1,037,229k	52,296k	+M20	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-c7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-f5 10.Qg8-f7+ Qc7xf7 11.e6xf7 Kf5-e6 12.f7-f8Q e3-e2 13.Qf8-d6+ Ke6-f5 14.Qd6-e5+ Kf5-g4 15.Qe5xe2+ Kg4-f4 16.Kg1-f2 Kf4-f5 17.Qe2-e5+ Kf5-g4 18.Qe5-d5 a4-a3 19.Ba1-f6 Kg4-f4 20.Qd5-f3+
As does Stockfish 11:

Code: Select all

FEN: 6bk/7p/2q1PP2/2Pp4/p2R4/5K2/8/B7 w - - 0 1

Stockfish_11_x64_bmi2:
 1/1	00:00	 862	431k	-0.15	1.f6-f7
 2/3	00:00	 2k	703k	+2.85	1.f6-f7 a4-a3 2.f7-f8Q
 3/7	00:00	 10k	3,384k	-1.52	1.f6-f7 Kh8-g7 2.f7xg8R+ Kg7xg8 3.Ba1-b2
 4/7	00:00	 33k	8,150k	-2.19	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-e2
 5/9	00:00	 35k	8,768k	-2.16	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-e2
 6/13	00:00	 40k	10,096k	-1.68	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-e2
 7/14	00:00	 55k	11,037k	-1.39	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6
 8/16	00:00	 91k	15,221k	-0.87	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4
 9/17	00:00	 105k	14,929k	-0.69	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6
 10/19	00:00	 125k	17,855k	-0.74	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-e3 a4-a3 8.Ke3-e4 Qg5-g2+ 9.Ke4-e3 Qg2-h3+ 10.Ke3-d2
 11/28	00:00	 147k	18,412k	-0.53	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-e3
 12/25	00:00	 164k	20,545k	-0.19	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-e3
 13/22	00:00	 181k	20,153k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-g5 7.Kf2-e3 a4-a3 8.Ke3-e4 Qg5-g2+ 9.Ke4-e3
 14/15	00:00	 241k	21,887k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-c2+ 7.Kf2-g3 Qc2-g6+
 15/19	00:00	 287k	22,075k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-c2+ 7.Kf2-g3 Qc2-g6+
 16/16	00:00	 397k	24,792k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-h6 6.Bd4-e5 Qh6-h2+ 7.Kf2-f1 Qh2-h1+ 8.Kf1-f2
 17/16	00:00	 487k	25,636k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-h6 6.Bd4-e5 Qh6-h2+ 7.Kf2-f1 Qh2-h1+ 8.Kf1-f2
 18/16	00:00	 653k	27,225k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-h6 6.Bd4-e5 Qh6-h2+ 7.Kf2-f1 Qh2-h1+ 8.Kf1-f2
 19/15	00:00	 817k	28,156k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-c2+ 7.Kf2-g3 Qc2-g6+
 20/15	00:00	 979k	28,801k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-c2+ 7.Kf2-g3 Qc2-g6+
 21/15	00:00	 1,257k	29,917k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-c2+ 7.Kf2-g3 Qc2-g6+
 22/17	00:00	 1,481k	30,216k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-h6 6.Bd4-e5 Qh6-h2+ 7.Kf2-f1 Qh2-h3+ 8.Kf1-f2
 23/18	00:00	 1,973k	30,826k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-c2+ 7.Kf2-g3 Qc2-g6+ 8.Kg3-h4 Qg6-h6+ 9.Kh4-g3
 24/17	00:00	 2,084k	31,106k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-c2+ 7.Kf2-g3 Qc2-g6+ 8.Kg3-f2
 25/15	00:00	 3,013k	31,716k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-c2+ 7.Kf2-g3 Qc2-g6+
 26/15	00:00	 3,929k	32,205k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-c2+ 7.Kf2-g3 Qc2-g6+
 27/15	00:00	 4,311k	32,412k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-c2+ 7.Kf2-g3 Qc2-g6+
 28/17	00:00	 5,200k	32,705k	 0.00	1.f6-f7 Bg8xf7 2.e6xf7 Kh8-g7 3.Rd4-f4+ d5-d4+ 4.Kf3-f2 Kg7-f8 5.Ba1xd4 Qc6-g6 6.c5-c6 Qg6-c2+ 7.Kf2-g3 Qc2-g6+
 29/38	00:00	 8,967k	33,838k	+11.96	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.c5-c6 Qb7-a7 8.Qf5-f6+ Kh6-h7 9.Qf6-h8+ Kh7-g6 10.Qh8xg8+ Kg6-h6 11.Qg8-g7+ Qa7xg7+ 12.Ba1xg7+ Kh6xg7 13.c6-c7 a4-a3 14.c7-c8Q Kg7-f6 15.Qc8-c3+ Kf6xe6 16.Qc3xe3+ Ke6-f7 17.Qe3xa3 Kf7-g6 18.Kg1-h2 Kg6-h6 19.Qa3-a8
 30/48	00:00	 17,828k	38,257k	+23.44	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.c5-c6 Qb7-a7 8.Qf5-f6+ Kh6-h7 9.Qf6-h8+ Kh7-g6 10.Qh8xg8+ Kg6-h6 11.Qg8-g7+ Qa7xg7+ 12.Ba1xg7+ Kh6xg7 13.c6-c7 Kg7-g6 14.c7-c8Q Kg6-f6 15.Qc8-h8+ Kf6-e7 16.Qh8xh5 a4-a3 17.Qh5-g5+ Ke7-e8 18.e6-e7
 31/52	00:00	 33,994k	43,030k	+39.79	1.Rd4-e4 d5xe4+ 2.Kf3-g2 h7-h5 3.f6-f7+ Kh8-h7 4.f7-f8Q e4-e3+ 5.Kg2-g1 Qc6-b7 6.Qf8-f5+ Kh7-h6 7.c5-c6 Qb7-c7 8.Qf5-f6+ Kh6-h7 9.Qf6-h8+ Kh7-g6 10.Qh8xg8+ Kg6-f5 11.Qg8-f7+ Kf5-e4 12.Qf7xc7 e3-e2 13.Qc7-e5+ Ke4-f3 14.Qe5-f6+ Kf3-e4 15.Qf6-d4+ Ke4-f3 16.Qd4-f2+ Kf3-e4 17.c6-c7 h5-h4 18.Qf2xe2+ Ke4-f4 19.c7-c8Q
 32/51	00:00	 36,205k	43,255k	+53.73	1.Rd4-e4 d5-d4 2.Ba1xd4 Qc6xc5 3.f6-f7+ Qc5xd4 4.f7xg8Q+ Kh8xg8 5.Re4xd4 Kg8-f8 6.Rd4xa4 Kf8-e7 7.Ra4-a7+ Ke7xe6 8.Kf3-e4 Ke6-f6 9.Ra7xh7 Kf6-g5 10.Rh7-f7 Kg5-g6 11.Rf7-f5 Kg6-h6 12.Rf5-a5 Kh6-g6 13.Ra5-a6+ Kg6-g7 14.Ra6-c6 Kg7-f7 15.Ke4-e5
 33/50	00:00	 42,625k	44,034k	+59.42	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-b7 6.Qf8-f5+ Kh7-h6 7.c5-c6 Qb7-a7 8.Qf5-f6+ Kh6-h7 9.Qf6-h8+ Kh7-g6 10.Qh8xg8+ Kg6-h6 11.Qg8-g7+ Qa7xg7+ 12.Ba1xg7+ Kh6xg7 13.c6-c7 a4-a3 14.c7-c8Q a3-a2 15.Qc8-c3+ Kg7-g6 16.e6-e7 Kg6-f7 17.Qc3-a3 h5-h4 18.Qa3xa2+ Kf7xe7 19.Qa2-a3+ Ke7-f6 20.Qa3xe3 Kf6-g6 21.Qe3-h3 Kg6-g5 22.Kg1-f2 Kg5-h5 23.Kf2-f3 Kh5-g5 24.Qh3-g4+ Kg5-f6
 34/50	00:01	 46,246k	44,086k	+59.55	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-b7 6.Qf8-f5+ Kh7-h6 7.c5-c6 Qb7-a7 8.Qf5-f6+ Kh6-h7 9.Qf6-h8+ Kh7-g6 10.Qh8xg8+ Kg6-h6 11.Qg8-g7+ Qa7xg7+ 12.Ba1xg7+ Kh6xg7 13.c6-c7 a4-a3 14.c7-c8Q a3-a2 15.Qc8-a6 e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 Kg7-f6 18.Qa6xa2 h5-h4 19.Qa2-a4 Kf6xe6 20.Qa4xh4 Ke6-d6 21.Ke1-f2 Kd6-d7 22.Kf2-e3 Kd7-e6 23.Qh4-h5 Ke6-d6 24.Qh5-e8
 35/52	00:01	 48,585k	44,008k	+59.70	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-b7 6.Qf8-f5+ Kh7-h6 7.c5-c6 Qb7-a7 8.Qf5-f6+ Kh6-h7 9.Qf6-h8+ Kh7-g6 10.Qh8xg8+ Kg6-h6 11.Qg8-g7+ Qa7xg7+ 12.Ba1xg7+ Kh6xg7 13.c6-c7 e3-e2 14.Kg1-f2 a4-a3 15.c7-c8Q Kg7-f6 16.Qc8-a6 h5-h4 17.Kf2xe2 Kf6-e7 18.Qa6xa3+ Ke7xe6 19.Qa3-h3+ Ke6-d5 20.Qh3xh4 Kd5-c6 21.Ke2-e3 Kc6-b5 22.Qh4-e4 Kb5-c5 23.Qe4-d4+ Kc5-c6 24.Qd4-a4+ Kc6-c7 25.Qa4-h4 Kc7-d7
 36/52	00:01	 49,331k	43,967k	+59.80	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-b7 6.Qf8-f5+ Kh7-h6 7.c5-c6 Qb7-a7 8.Qf5-f6+ Kh6-h7 9.Qf6-h8+ Kh7-g6 10.Qh8xg8+ Kg6-h6 11.Qg8-g7+ Qa7xg7+ 12.Ba1xg7+ Kh6xg7 13.c6-c7 e3-e2 14.Kg1-f2 a4-a3 15.c7-c8Q Kg7-f6 16.Qc8-h8+ Kf6-e7 17.Qh8xh5 a3-a2 18.Qh5-a5 a2-a1Q 19.Qa5xa1 Ke7xe6 20.Kf2xe2 Ke6-d5 21.Ke2-e3 Kd5-d6 22.Qa1-a6+ Kd6-c7 23.Qa6-f6 Kc7-d7 24.Qf6-d4+ Kd7-c6 25.Ke3-f2 Kc6-c7 26.Qd4-c5+ Kc7-b7 27.Qc5-d5+ Kb7-a7
 37/51	00:01	 52,483k	43,956k	+59.80	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-b7 6.Qf8-f5+ Kh7-h6 7.c5-c6 Qb7-a7 8.Qf5-f6+ Kh6-h7 9.Qf6-h8+ Kh7-g6 10.Qh8xg8+ Kg6-h6 11.Qg8-g7+ Qa7xg7+ 12.Ba1xg7+ Kh6xg7 13.c6-c7 Kg7-f6 14.c7-c8Q h5-h4 15.Qc8-a6 h4-h3 16.Qa6xa4 Kf6xe6 17.Qa4-e8+ Ke6-d6 18.Qe8xe3 h3-h2+ 19.Kg1xh2 Kd6-c7 20.Kh2-g1 Kc7-d6 21.Qe3-a3+ Kd6-c7 22.Kg1-f2 Kc7-c6 23.Qa3-a4+ Kc6-c7 24.Kf2-e3 Kc7-b6 25.Qa4-d7 Kb6-a6 26.Qd7-e8
 38/53	00:01	 67,493k	45,267k	+70.53	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-b7 6.Qf8-f5+ Kh7-h6 7.c5-c6 Qb7-a7 8.Qf5-f6+ Kh6-h7 9.Qf6-h8+ Kh7-g6 10.Qh8xg8+ Kg6-h6 11.Qg8-g7+ Qa7xg7+ 12.Ba1xg7+ Kh6xg7 13.c6-c7 Kg7-f6 14.c7-c8Q e3-e2 15.Kg1-f2 e2-e1R 16.Kf2xe1 a4-a3 17.Qc8-c4 Kf6-e7 18.Qc4-c5+ Ke7-f6 19.Qc5xh5 Kf6-e7 20.Qh5-d5 Ke7-f6 21.Qd5-f3+ Kf6-e5 22.Qf3xa3
 39/66	00:02	 124,871k	45,408k	+M22	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-b7 6.Qf8-f5+ Kh7-h6 7.c5-c6 Qb7-a7 8.Qf5-f6+ Kh6-h7 9.Qf6-h8+ Kh7-g6 10.Qh8xg8+ Kg6-h6 11.Qg8-f8+ Kh6-g5 12.Qf8-f6+ Kg5-g4 13.Qf6-g6+ Kg4-f3 14.Qg6-f7+ Qa7xf7 15.e6xf7 e3-e2 16.f7-f8Q+ Kf3-e3 17.Qf8-f2+ Ke3-e4 18.c6-c7 e2-e1Q+ 19.Qf2xe1+ Ke4-f3 20.Qe1-e5 a4-a3 21.c7-c8Q a3-a2 22.Qc8-h3+
 40/44	00:02	 125,689k	45,359k	+M22	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-b7 6.Qf8-f5+ Kh7-h6 7.c5-c6 Qb7-a7 8.Qf5-f6+ Kh6-h7 9.Qf6-h8+ Kh7-g6 10.Qh8xg8+ Kg6-h6 11.Qg8-f8+ Kh6-g5 12.Qf8-f6+ Kg5-g4 13.Qf6-g6+ Kg4-f3 14.Qg6-f7+ Qa7xf7 15.e6xf7 e3-e2 16.f7-f8Q+ Kf3-e3 17.Qf8-f2+ Ke3-e4 18.c6-c7 e2-e1Q+ 19.Qf2xe1+ Ke4-f3 20.Qe1-e5 a4-a3 21.c7-c8Q a3-a2 22.Qc8-h3+
 41/44	00:02	 128,542k	45,229k	+M22	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-b7 6.Qf8-f5+ Kh7-h6 7.c5-c6 Qb7-a7 8.Qf5-f6+ Kh6-h7 9.Qf6-h8+ Kh7-g6 10.Qh8xg8+ Kg6-h6 11.Qg8-f8+ Kh6-g5 12.Qf8-f6+ Kg5-g4 13.Qf6-g6+ Kg4-f3 14.Qg6-f7+ Qa7xf7 15.e6xf7 e3-e2 16.f7-f8Q+ Kf3-e3 17.Qf8-f2+ Ke3-e4 18.c6-c7 e2-e1Q+ 19.Qf2xe1+ Ke4-f3 20.Qe1-e5 a4-a3 21.c7-c8Q a3-a2 22.Qc8-h3+
 42/44	00:02	 131,523k	45,135k	+M22	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-b7 6.Qf8-f5+ Kh7-h6 7.c5-c6 Qb7-a7 8.Qf5-f6+ Kh6-h7 9.Qf6-h8+ Kh7-g6 10.Qh8xg8+ Kg6-h6 11.Qg8-f8+ Kh6-g5 12.Qf8-f6+ Kg5-g4 13.Qf6-g6+ Kg4-f3 14.Qg6-f7+ Qa7xf7 15.e6xf7 e3-e2 16.f7-f8Q+ Kf3-e3 17.Qf8-f2+ Ke3-e4 18.c6-c7 e2-e1Q+ 19.Qf2xe1+ Ke4-f3 20.Qe1-e5 a4-a3 21.c7-c8Q a3-a2 22.Qc8-h3+
 43/44	00:02	 131,886k	45,105k	+M22	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-b7 6.Qf8-f5+ Kh7-h6 7.c5-c6 Qb7-a7 8.Qf5-f6+ Kh6-h7 9.Qf6-h8+ Kh7-g6 10.Qh8xg8+ Kg6-h6 11.Qg8-f8+ Kh6-g5 12.Qf8-f6+ Kg5-g4 13.Qf6-g6+ Kg4-f3 14.Qg6-f7+ Qa7xf7 15.e6xf7 e3-e2 16.f7-f8Q+ Kf3-e3 17.Qf8-f2+ Ke3-e4 18.c6-c7 e2-e1Q+ 19.Qf2xe1+ Ke4-f3 20.Qe1-e5 a4-a3 21.c7-c8Q a3-a2 22.Qc8-h3+
 44/44	00:03	 135,304k	44,966k	+M22	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-b7 6.Qf8-f5+ Kh7-h6 7.c5-c6 Qb7-a7 8.Qf5-f6+ Kh6-h7 9.Qf6-h8+ Kh7-g6 10.Qh8xg8+ Kg6-h6 11.Qg8-f8+ Kh6-g5 12.Qf8-f6+ Kg5-g4 13.Qf6-g6+ Kg4-f3 14.Qg6-f7+ Qa7xf7 15.e6xf7 e3-e2 16.f7-f8Q+ Kf3-e3 17.Qf8-f2+ Ke3-e4 18.c6-c7 e2-e1Q+ 19.Qf2xe1+ Ke4-f3 20.Qe1-e5 a4-a3 21.c7-c8Q a3-a2 22.Qc8-h3+
 45/44	00:03	 151,452k	44,597k	+M22	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-b7 6.Qf8-f5+ Kh7-h6 7.c5-c6 Qb7-a7 8.Qf5-f6+ Kh6-h7 9.Qf6-h8+ Kh7-g6 10.Qh8xg8+ Kg6-h6 11.Qg8-f8+ Kh6-g5 12.Qf8-f6+ Kg5-g4 13.Qf6-g6+ Kg4-f3 14.Qg6-f7+ Qa7xf7 15.e6xf7 e3-e2 16.f7-f8Q+ Kf3-e3 17.Qf8-f2+ Ke3-e4 18.c6-c7 e2-e1Q+ 19.Qf2xe1+ Ke4-f3 20.Qe1-e5 a4-a3 21.c7-c8Q a3-a2 22.Qc8-h3+
 46/44	00:03	 152,874k	44,583k	+M22	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-b7 6.Qf8-f5+ Kh7-h6 7.c5-c6 Qb7-a7 8.Qf5-f6+ Kh6-h7 9.Qf6-h8+ Kh7-g6 10.Qh8xg8+ Kg6-h6 11.Qg8-f8+ Kh6-g5 12.Qf8-f6+ Kg5-g4 13.Qf6-g6+ Kg4-f4 14.Qg6-f7+ Qa7xf7 15.e6xf7 e3-e2 16.Kg1-f2 e2-e1Q+ 17.Kf2xe1 h5-h4 18.c6-c7 h4-h3 19.f7-f8Q+ Kf4-e3 20.c7-c8Q h3-h2 21.Qc8-h3+ Ke3-e4 22.Qf8-f5+
 47/44	00:04	 195,201k	45,343k	+M21	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-c7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-f5 10.Qg8-f7+ Qc7xf7 11.e6xf7 e3-e2 12.f7-f8Q+ Kf5-e4 13.Qf8-a8+ Ke4-f4 14.Kg1-f2 e2-e1Q+ 15.Kf2xe1 h5-h4 16.Qa8-d5 h4-h3 17.Ke1-f2 h3-h2 18.Ba1-f6 h2-h1Q 19.Qd5-g5+ Kf4-e4 20.Qg5-e5+ Ke4-d3 21.Qe5-e2+
 48/42	00:04	 211,038k	45,346k	+M21	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-c7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-f5 10.Qg8-f7+ Qc7xf7 11.e6xf7 e3-e2 12.f7-f8Q+ Kf5-e4 13.Qf8-a8+ Ke4-f4 14.Kg1-f2 e2-e1Q+ 15.Kf2xe1 h5-h4 16.Qa8-d5 h4-h3 17.Ke1-f2 h3-h2 18.Ba1-f6 h2-h1Q 19.Qd5-g5+ Kf4-e4 20.Qg5-e5+ Ke4-d3 21.Qe5-e2+
 49/40	00:04	 222,514k	45,485k	+M20	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-c7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-f5 10.Qg8-f7+ Qc7xf7 11.e6xf7 e3-e2 12.f7-f8Q+ Kf5-e4 13.Kg1-f2 e2-e1Q+ 14.Kf2xe1 Ke4-d5 15.Qf8-d6+ Kd5-c4 16.c5-c6 a4-a3 17.c6-c7 Kc4-b5 18.Qd6xa3 h5-h4 19.c7-c8Q h4-h3 20.Qc8-c5+
 50/40	00:04	 223,814k	45,463k	+M20	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-c7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-f5 10.Qg8-f7+ Qc7xf7 11.e6xf7 e3-e2 12.f7-f8Q+ Kf5-e4 13.Kg1-f2 e2-e1Q+ 14.Kf2xe1 Ke4-d5 15.Qf8-d6+ Kd5-c4 16.c5-c6 a4-a3 17.c6-c7 Kc4-b5 18.Qd6xa3 h5-h4 19.c7-c8Q h4-h3 20.Qc8-c5+
 51/40	00:05	 235,841k	45,319k	+M20	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-c7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-f5 10.Qg8-f7+ Qc7xf7 11.e6xf7 e3-e2 12.f7-f8Q+ Kf5-e4 13.Kg1-f2 e2-e1Q+ 14.Kf2xe1 Ke4-d5 15.Qf8-d6+ Kd5-c4 16.c5-c6 a4-a3 17.c6-c7 Kc4-b5 18.Qd6xa3 h5-h4 19.c7-c8Q h4-h3 20.Qc8-c5+
 52/40	00:05	 243,855k	45,225k	+M20	1.Rd4-e4 d5xe4+ 2.Kf3-g2 e4-e3+ 3.Kg2-g1 h7-h5 4.f6-f7+ Kh8-h7 5.f7-f8Q Qc6-c7 6.Qf8-f5+ Kh7-h6 7.Qf5-f6+ Kh6-h7 8.Qf6-h8+ Kh7-g6 9.Qh8xg8+ Kg6-f5 10.Qg8-f7+ Qc7xf7 11.e6xf7 e3-e2 12.f7-f8Q+ Kf5-e4 13.Kg1-f2 e2-e1Q+ 14.Kf2xe1 Ke4-d5 15.Qf8-d6+ Kd5-c4 16.c5-c6 a4-a3 17.c6-c7 Kc4-b5 18.Qd6xa3 h5-h4 19.c7-c8Q h4-h3 20.Qc8-c5+
Top
Dann Corbit
Posts: 12804
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: Top 2 Engines find flaw in this 1959 Chess puzzle

Post by Dann Corbit »

90 second analysis:

Code: Select all

LC0 chose f7 and never varied for 90 seconds
End pv:     21/38	01:25	        942k	11k	 0.00	f7  Bxf7  exf7  Kg7  Rf4+  d4+  Kf2  Kf8  Bxd4  Qg6  c6  Qc2+  Kg3  Qg6+  Kh4  Qh6+  Kg4  Qg6+  Kh3  Qh6+  Kg3  Qg6+
Stockfish-x64-avx2 chose Re4 at ply 3:      3/3	00:00	        112k	16,001k	-0.51	Re4  dxe4+  Kg2
found mate in 20 at six seconds
End pv:     42/46	00:06	    148,822k	22,556k	+M20	Re4  dxe4+  Kg2  e3+  Kg1  h5  f7+  Kh7  f8Q  Qc7  Qf5+  Kh6  Qf6+  Kh7  Qh8+  Kg6  Qxg8+  Kf5  Qf7+  Qxf7  exf7  Ke6  f8Q  Kd5  Qd6+  Kc4  c6  e2  Kf2  Kb5  Kxe2  h4  c7  a3  c8Q  Ka4  Qc4+  Ka5  Qdc5+
Arasanx-64-avx2 chose Re4 in 8 seconds      39+	00:08	    310,519k	34,835k	+0.17	Re4  dxe4+
Never found mate 20 (failing high at the end):      39+	00:09	    351,192k	35,299k	+5.80	Re4  dxe4+Blue Marlin 14.1-avx2 found Re4  at ply  18/19	00:00	      1,230k	24,118k	+4.16	Re4  h5  f7+  Kh7  f8Q  dxe4+  Kf4  Qc7+  Be5
and mate in 20 at 3 seconds:     49/42	00:03	    258,003k	85,431k	+M20	Re4  dxe4+  Kg2  e3+  Kg1  h5  f7+  Kh7  f8Q  Qc7  Qf5+  Kh6  Qf6+  Kh7  Qh8+  Kg6  Qxg8+  Kf5  Qf7+  Qxf7  exf7  Ke4  c6  e2  Kf2  e1Q+  Kxe1  h4  c7  h3  c8Q  h2  Qe6+  Kf3  f8Q+  Kg2  Qf2+  Kh1  Qf1+
Crystal 6 PMT avx2 found Re4 at ply 9 in 0 seconds:      9/12	00:00	        424k	35,335k	+3.07	Re4  dxe4+  Kg2  e3+  Kg1  h5  f7+  Kh7  f8Q
and finished with dm 22:     46/43	01:22	  6,748,040k	82,249k	+M22	Re4  dxe4+  Kg2  h5  f7+  Kh7  f8Q  e3+  Kg1  Qb7  Qf5+  Kh6  c6  Qa7  Qf6+  Kh7  Qh8+  Kg6  Qxg8+  Kh6  Qh8+  Kg5  Qf6+  Kg4  Qg6+  Kf4  Qf7+  Qxf7  exf7  Ke4  f8Q  Kd5  c7  e2  Qf2  e1Q+  Qxe1  Kc4  c8Q+  Kb3  Qcc3+  Ka2  Qb2+
Houdidit-Tactical:Nalimov found Re4 in 7 seconds at ply 19:     19/50+	00:07	    103,865k	14,106k	+0.07	Re4
and finished at dm 25:     28/63	00:53	    844,202k	15,706k	+M25	Re4  dxe4+  Kg2  h5  f7+  Kh7  f8Q  e3+  Kg1  Qb7  Qf5+  Kh6  Qf6+  Kh7  Qh8+  Kg6  Qxg8+  Kh6  Qh8+  Kg5  Qf6+  Kg4  Qg6+  Kf4  Qf7+  Qxf7  exf7  e2  f8Q+  Kg5  Qe7+  Kf4  Qxe2  h4  Qh5
Rebel-16.2 found Re4 at ply    27/27+	00:00	      3,032k	13,014k	+0.10	Re4
and found dm20 at 30 seconds:   60/60	00:30	  1,329,347k	44,183k	+M20	Re4  dxe4+  Kg2  e3+  Kg1  h5  f7+  Kh7  f8Q  Qc7  Qf5+  Kh6  Qf6+  Kh7  Qh8+  Kg6  Qxg8+  Kf5  Qf7+  Qxf7  exf7  Ke4  f8Q  Kd5  Qd6+  Ke4  c6  e2  Kf2  e1Q+  Kxe1  h4  c7  a3  c8Q  h3  Qce6+  Kf3  Qe2+
Chess-System-Tal-2.00-v21-E1019-Elo.opt-avx2 found Re4  at ply  22/27+	00:00	        751k	9,054k	+0.10	Re4
and dm 20 with one second to go:     60/60	01:29	  2,598,283k	29,099k	+M20	Re4  dxe4+  Kg2  h5  f7+  Kh7  f8Q  e3+  Kg1  Qc7  Qf5+  Kh6  Qf6+  Kh7  Qh8+  Kg6  Qxg8+  Kf5  Qf7+  Qxf7  exf7  Ke4  f8Q  e2  Kf2  Kd5  Qd6+  Kc4  c6  e1N  Kxe1  Kb5  c7  Kc4  c8Q+  Kb3  Qg8+  Kc2  Qd1+
Chess-System-Tal-2.00-v21-E1162-130-EAS.opt-avx2 found Re4 at ply     24/31+	00:00	      1,467k	11,286k	+0.10	Re4
and dm 20 in 14 seconds:     54/55	00:14	    363,022k	25,201k	+M20	Re4  dxe4+  Kg2  e3+  Kg1  h5  f7+  Kh7  f8Q  Qb7  Qf5+  Kh6  Bf6  Qg7+  Bxg7+  Kxg7  c6  e2  Qe5+  Kh6  e7  e1Q+  Qxe1  Bf7  e8Q  Bxe8  c7  Bd7  Qd2+  Kg6  Qxd7  Kg5  c8Q  Kf4  Qf5+  Ke3  Qc3+  Ke2  Qxh5+
ShashChess33-x86-64-avx2 found Re4 at ply    33/29	00:00	     13,584k	54,773k	+5.54	Re4  dxe4+  Kg2  h5  f7+  Kh7  f8Q  e3+  Kg1  Qc7  Qf5+  Kh6  Qf6+  Kh7  Qh8+  Kg6  Qxg8+  Kf5  Qf7+  Qxf7  exf7  Ke6  f8R  Kd5  Rf5+  Kc6  Re5  e2  Rxe2
And dm 20 at 8 seconds:     34/51	00:08	    573,394k	70,938k	+M20	Re4  dxe4+  Kg2  h5  f7+  Kh7  f8Q  e3+  Kg1  Qc7  Qf5+  Kh6  Qf6+  Kh7  Qh8+  Kg6  Qxg8+  Kf5  Qf7+  Qxf7  exf7  Ke6  f8Q  e2  Qd6+  Kf5  Kf2  a3  c6  e1R  Kxe1  Kg5  c7  Kg4  c8Q+  Kf3  Qf5+  Kg2  Qf1+
Slow64-avx2 found Re4 at 1 second:      29/48+	00:01	     54,205k	42,681k	+0.01	Re4
and dm 20 at 3 seconds:     29/49	00:03	    168,673k	42,810k	+M20	Re4  dxe4+  Kg2  e3+  Kg1  h5  f7+  Kh7  f8Q  Qb7  Qf5+  Kh6  Qf6+  Kh7  e7  Qb1+  Kh2  Qa2+  Bb2  Qxb2+  Qxb2  Bf7  c6  e2  Qxe2  a3  c7  a2  e8Q  Bxe8  c8Q  a1Q  Qcxe8  Qh1+  Kxh1  Kg7  Q2e5+  Kh6  Q8xh5+
Sting-sf-28-gcc found Re4 at  2 seconds:    15+	00:02	        332k	142k	+1.09	Re4
and finished on a fail high :      27	00:07	     54,839k	6,860k	+83.03	Re4  Qxc5  f7+  d4  Bxd4+  Qxd4  fxg8Q+  Kxg8  Rxd4  Kf8  Rxa4  Ke7  Ra7+  Kxe6  Ke4  h5  Ra6+  Kd7  Rh6  h4  Rxh4  Kc6  Kd4  Kd7  Kd5  Ke7  Rh6  Kf8  Ke5  Kf7  Re6  Kg7
SugaR AI ICCF 2.50 avx2 found Re4 at zero seconds:      8/14	00:00	        486k	40,490k	-0.44	Re4  dxe4+  Kg2  e3+  Kg1  Bf7  exf7  Qc8
and dm 20 at 61 seconds:     39/39	01:01	  3,631,196k	59,364k	+M20	Re4  dxe4+  Kg2  e3+  Kg1  h5  f7+  Kh7  f8Q  Qc7  Qf5+  Kh6  Qf6+  Kh7  Qh8+  Kg6  Qxg8+  Kf5  Qf7+  Qxf7  exf7  Ke6  f8Q  Kd5  Qd6+  Kc4  c6  e2  Kf2  e1Q+  Kxe1  a3  c7  Kb5  c8Q  Ka4  Qc4+  Ka5  Qdc5+
The Huntsman 1 avx2 found Re4 at zero seconds:     15/16	00:00	        907k	21,586k	+1.81	Re4  dxe4+  Kg2  h5  f7+  Kh7  f8Q  e3+  Kg1
and dm 20 at 7 seconds:     58/42	00:07	    461,713k	63,976k	+M20	Re4  dxe4+  Kg2  h5  f7+  Kh7  f8Q  e3+  Kg1  Qc7  Qf5+  Kh6  Qf6+  Kh7  Qh8+  Kg6  Qxg8+  Kf5  Qf7+  Qxf7  exf7  Ke6  f8Q  e2  Kf2  e1Q+  Kxe1  Kd5  Qd6+  Kc4  c6  Kb5  c7  Kc4  c8Q+  Kb3  Qc3+  Ka2  Qb2+
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.
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