A hard endgame (?) study

AdminX · Post by **AdminX** » Sun Jul 09, 2017 5:05 am

Paloma wrote:
AdminX wrote: 43/84 318:24 +M22 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4 4.Qb5 Rxc2
5.Qb3 Nxa5 6.Qxc2 Nac4 7.Qc3+ Kc5
8.c8R+ Rxc8 9.d4+ Kd6 10.Nxc8+ Kxe6
11.Nxb6 Nxb6 12.Qc6+ Ke7 13.Qc5+ Kd7
14.Bc6+ (281.123.648.721) 14715
TB:40.843.216
Mate in 22 is korrect, but 5...Nxa5 is suboptimal because 6.Qxc2 is M15

Better is 5...Ke5 and now 6.Nec6+ is M17, so the distance M22 from move one is korrect.

[d]r7/1QpnN1Kp/p3P1b1/Nn1P1p2/3k3p/p4BP1/1rPPp2q/8 w - -

Engine: AsmFish [6] (6144 MB)
by TypingALot

43/84 318:24 +M22 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4 4.Qb5 Rxc2
5.Qb3 Nxa5 6.Qxc2 Nac4 7.Qc3+ Kc5
8.c8R+ Rxc8 9.d4+ Kd6 10.Nxc8+ Kxe6
11.Nxb6 Nxb6 12.Qc6+ Ke7 13.Qc5+ Kd7
14.Bc6+ (281.123.648.721) 14715
TB:40.843.216

44/84 351:17 +M22 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4 4.Qb5 Rxc2
5.Qb3 Ke5 6.Nec6+ Kxe6 7.Nxc4 Rxc4
8.Qxb6 Qxg3 9.Nd4+ Kd7 10.Qe6+ Kxc7
11.Qxc4+ Kd8 12.Qd5+ Ke8 13.Qxa8+ Kd7
14.Qc6+ (313.086.192.515) 14854
TB:62.536.117

45/84 410:08 +M22 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4 4.Qb5 Rxc2
5.Qb3 Ke5 6.Nec6+ Kxe6 7.Nxc4 Rxc4
8.Qxb6 Qxg3 9.Nd4+ Kd7 10.Qe6+ Kxc7
11.Qxc4+ Kd8 12.Qd5+ Ke8 13.Qxa8+ Kd7
14.Qc6+ (370.685.237.011) 15063
TB:88.927.917

46/84 440:19 +M22 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4 4.Qb5 Rxc2
5.Qb3 Ke5 6.Nec6+ Kxe6 7.Nxc4 Rxc4
8.Qxb6 Qxg3 9.Nd4+ Kd7 10.Qe6+ Kxc7
11.Qxc4+ Kd8 12.Qd5+ Ke8 13.Qxa8+ Kd7
14.Qc6+ (400.358.310.151) 15154
TB:101.341.683

47/84 489:19 +M22 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4 4.Qb5 Rxc2
5.Qb3 Ke5 6.Nec6+ Kxe6 7.Nxc4 Rxc4
8.Qxb6 Qxg3 9.Nd4+ Kd7 10.Qe6+ Kxc7
11.Qxc4+ Kd8 12.Qd5+ Ke8 13.Qxa8+ Kd7
14.Qc6+ (449.406.194.915) 15306
TB:128.212.056

Vinvin · Post by **Vinvin** » Sun Jul 09, 2017 5:52 am

Arpad Rusz wrote:The following study has at least five variations with queen sacrifices which makes it hard for the engines. White wins!

[pgn][Event "StrateGems"]
[Site "?"]
[Date "2015.??.??"]
[Round "?"]
[White "Wieland Bruch (after G .Heathcote)"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "r7/1QpnN1Kp/p3P1b1/Nn1P1p2/3k3p/p4BP1/1rPPp2q/8 w - - 0 0"]
[PlyCount "13"]

1. d6 Nb6 2. dxc7 Nd6 3. Qc6 Ne4 (3... Ndc4 4. Qb5 $1 Rxb5 5. Nec6+ Kc5 6. Nb7#
) 4. Nb7 e1=Q (4... Ke5 5. Qd6+ $1 Nxd6 6. Nc6+ Kxe6 7. Nc5#) (4... Rb5 5. Qc3+
$1 Nxc3 6. Nc6+ Kc4 7. d3#) (4... Qxg3 5. Qd5+ $1 Nxd5 6. Nc6+ Kc4 7. Bxe2+ Qd3
8. Bxd3#) 5. Qc5+ $1 Nxc5 6. Nc6+ Kc4 7. Nd6# 1-0[/pgn]

The position after 1. d6 Nb6 2. dxc7 Nd6 3. Qc6 Ndc4 is interesting : find 4. Qb5 !

[d]r7/2P1N1Kp/pnQ1P1b1/N4p2/2nk3p/p4BP1/1rPPp2q/8 w - - 3 4

Code: Select all

Sting-sf-81&#58;
...
 14	00&#58;05	 19 184k	3 724k	-4,00	4.Qxa8 Nxa8 5.Nec6+ Kc5 6.c8Q Nd6 7.d4+ Kb5 8.Qb8+ Nb6 9.Bxe2+ Qxe2 10.Qxd6 Qxc2 11.Qxa3 Nd5 12.gxh4 Kb6 13.Qd6
 15+	00&#58;06	 26 076k	4 346k	-3,87	4.Qxa8
 15+	00&#58;06	 26 987k	4 410k	-3,75	4.Qxa8
 15+	00&#58;10	 61 670k	6 098k	 0,00	4.Qxa8
 15	00&#58;11	 71 355k	6 327k	 0,00	4.Qxa8 Nxa8 5.Nec6+ Kc5 6.c8Q Nxa5 7.Ne5+ Kb5 8.Qd7+ Kb6 9.Qd4+ Kb5 10.Qd7+
 16	00&#58;14	 99 308k	6 788k	 0,00	4.Qxa8 Nxa8 5.Nec6+ Kc5 6.c8Q Nxa5 7.Ne5+ Kb5 8.Qd7+ Kb6 9.Qd4+ Kb5 10.Qd7+
 17	00&#58;17	 125 473k	7 176k	 0,00	4.Qxa8 Nxa8 5.Nec6+ Kc5 6.c8Q Nxa5 7.Ne5+ Kb5 8.Qd7+ Kb6 9.Qd4+ Kb5 10.Qd7+
 18	00&#58;23	 178 826k	7 671k	 0,00	4.Qxa8 Nxa8 5.Nec6+ Kc5 6.c8Q Nxa5 7.Ne5+ Kb5 8.Qd7+ Kb6 9.Qd4+ Kb5 10.Qd7+
 19	00&#58;33	 268 596k	7 980k	 0,00	4.Qxa8 Nxa8 5.Nec6+ Kc5 6.c8Q Nxa5 7.Ne5+ Kb5 8.Qd7+ Kb6 9.Qd4+ Kb5 10.Qd7+
 20	01&#58;08	 569 703k	8 295k	 0,00	4.Qxa8 Nxa8 5.Nec6+ Kc5 6.c8Q Nxa5 7.Ne5+ Kb5 8.Qd7+ Kb6 9.Qd4+ Kb5 10.Qd7+
 21+	02&#58;00	 1 017 954k	8 420k	+0,08	4.Qb5
 21+	02&#58;02	 1 033 810k	8 425k	+0,16	4.Qb5
 21+	03&#58;08	 1 606 037k	8 529k	+9,16	4.Qb5
 21	03&#58;48	 1 948 817k	8 545k	+11,11	4.Qb5 Rxc2 5.Qb3 Nxa5 6.Qxb6+ Rc5 7.Qb4+ Kd3 8.Qxc5 Kxd2 9.Qxa5+ Ke3 10.Bxa8 Kf2 11.Qd2 Qxg3 12.c8Q Bh5+ 13.Kxh7 Qe3 14.Qxe3+ Kxe3 15.Qc3+ Kf2 16.Qc5+ Kf1 17.Qxf5+ Kg1 18.Qg5+ Kf2 19.Qxh4+ Ke3 20.Qe1
 22+	04&#58;15	 2 191 629k	8 568k	+11,23	4.Qb5
 22+	04&#58;18	 2 217 799k	8 569k	+11,35	4.Qb5
 22+	04&#58;30	 2 318 695k	8 559k	+12,21	4.Qb5
 22	05&#58;21	 2 742 941k	8 541k	+11,47	4.Qb5 Rxc2 5.Qb3 Nxa5 6.Qxb6+ Rc5 7.Qb4+ Kd3 8.Qxc5 Kxd2 9.Qxa5+ Ke3 10.Bxa8 Kf2 11.Qd2 a2 12.Qxa2 Qxg3 13.c8Q Qe5+ 14.Kg8 Bh5 15.Qcxa6 h3 16.Kxh7 f4 17.Qb6+ Qe3 18.Qbb1 Bf3 19.Bxf3 Kxf3 20.Qe1
 23+	05&#58;45	 2 954 940k	8 556k	+11,59	4.Qb5
 23+	05&#58;49	 2 993 281k	8 557k	+11,71	4.Qb5
 23+	06&#58;20	 3 268 739k	8 582k	+13,19	4.Qb5
 23	07&#58;51	 4 051 402k	8 598k	+13,57	4.Qb5 Rxc2 5.Qb3 Nxa5 6.Qxb6+ Rc5 7.Qb4+ Kd3 8.Qxc5 Kxd2 9.Qxa5+ Ke3 10.Bxa8 Kf2 11.Qd2 a2 12.Qxa2 Qxg3 13.c8Q Qe5+ 14.Kg8 Bh5 15.Qcxa6 h3 16.Qa7+ Kf1 17.Q7a3 Bg4 18.Qc4 Kf2 19.Qa7+ Kf1 20.Nc6 Qg3 21.e7 Bh5+ 22.Kxh7 Qg6+ 23.Kh8 Bf3
 24+	08&#58;29	 4 397 708k	8 626k	+13,69	4.Qb5
 24+	08&#58;48	 4 566 521k	8 637k	+13,81	4.Qb5
 24+	09&#58;19	 4 852 464k	8 665k	+14,27	4.Qb5

BrendanJNorman · Post by **BrendanJNorman** » Sun Jul 09, 2017 7:24 am

Nordlandia wrote:Sokolsky - Ravinsky, USSR 1938 (or 1933)

a8=B is supposed to win, however no engine see a breakthrough.

[d]4b1k1/P4pPp/1R3P1P/2r5/8/1P6/1K6/8 w - - 0 0

https://timkr.home.xs4all.nl/chess2/minor.htm

This is actually a really interesting study - it's s shame nobody tries to solve things with their brain nowadays.

Here's my thoughts (didn't use an engine at all, so try to follow the analysis without one if you can too - otherwise it might look ridiculous

)

I didn't see it written that 1.a8=B is supposed to win, so I came upon the idea of 1.Re6!? Rc8 (1...Bc6?? 2.a8=Q+ mates on e8, 1...fxe6 2.a8=Q wins because there is no stalemate on c2) 2.Re7 and I think in this position, white has chances due to his passed pawns, black's passivity and white's soon to be active king.

White's b-pawn will run and there are lots of back rank tricks, as well as ideas of Rxe8 (assuming the bishop stays/returns there) and self-supporting a+b pawn scenarios.

Nevertheless, I think 1.Re6 is a nice idea.

MikeGL · Post by **MikeGL** » Sun Jul 09, 2017 9:14 am

BrendanJNorman wrote:
Nordlandia wrote:Sokolsky - Ravinsky, USSR 1938 (or 1933)

a8=B is supposed to win, however no engine see a breakthrough.

[d]4b1k1/P4pPp/1R3P1P/2r5/8/1P6/1K6/8 w - - 0 0

https://timkr.home.xs4all.nl/chess2/minor.htm
This is actually a really interesting study - it's s shame nobody tries to solve things with their brain nowadays.

Here's my thoughts (didn't use an engine at all, so try to follow the analysis without one if you can too - otherwise it might look ridiculous )

I didn't see it written that 1.a8=B is supposed to win, so I came upon the idea of 1.Re6!? Rc8 (1...Bc6?? 2.a8=Q+ mates on e8, 1...fxe6 2.a8=Q wins because there is no stalemate on c2) 2.Re7 and I think in this position, white has chances due to his passed pawns, black's passivity and white's soon to be active king.

White's b-pawn will run and there are lots of back rank tricks, as well as ideas of Rxe8 (assuming the bishop stays/returns there) and self-supporting a+b pawn scenarios.

Nevertheless, I think 1.Re6 is a nice idea.

That's a very good idea. But note also that once the a8(B) under-promotion
is missed on first move, the bishop of black would occupy the h1-a8
diagonal and there's no way white can make progress. If K or R protects
and assist the b7 push, then black would just capture it with his B with Bxb7 and and then the desperado Rook of black would deliver all types
of checks until the end of the universe which just results to a draw.

regards

peter · Post by **peter** » Sun Jul 09, 2017 9:23 am

Hi Arpad!

A great one too, yes, but once again I'd like the author to at least mention the best defences for the losing side in the solution- tree.

Of course it's not a mate- study, but if 3...Ndc4! 4.Qb5 Rxc2! takes 22 moves to mate and 4...Rxb5? takes only 6, the move much better for Black should be mentioned too.

And 3...Ne8+(!?) takes 20 moves to mate, it should be mentioned as one more black defence also, as well as 3...Ne4 4.Nb7 4.Rxc2! again (#17).

That just to get a clue, why engines have a hard time with the position, it's simply not a mate in a few moves only

BrendanJNorman · Post by **BrendanJNorman** » Sun Jul 09, 2017 10:23 am

MikeGL wrote:
BrendanJNorman wrote:
Nordlandia wrote:Sokolsky - Ravinsky, USSR 1938 (or 1933)

a8=B is supposed to win, however no engine see a breakthrough.

[d]4b1k1/P4pPp/1R3P1P/2r5/8/1P6/1K6/8 w - - 0 0

https://timkr.home.xs4all.nl/chess2/minor.htm
This is actually a really interesting study - it's s shame nobody tries to solve things with their brain nowadays.

Here's my thoughts (didn't use an engine at all, so try to follow the analysis without one if you can too - otherwise it might look ridiculous )

I didn't see it written that 1.a8=B is supposed to win, so I came upon the idea of 1.Re6!? Rc8 (1...Bc6?? 2.a8=Q+ mates on e8, 1...fxe6 2.a8=Q wins because there is no stalemate on c2) 2.Re7 and I think in this position, white has chances due to his passed pawns, black's passivity and white's soon to be active king.

White's b-pawn will run and there are lots of back rank tricks, as well as ideas of Rxe8 (assuming the bishop stays/returns there) and self-supporting a+b pawn scenarios.

Nevertheless, I think 1.Re6 is a nice idea.
That's a very good idea. But note also that once the a8(B) under-promotion
is missed on first move, the bishop of black would occupy the h1-a8
diagonal and there's no way white can make progress. If K or R protects
and assist the b7 push, then black would just capture it with his B with Bxb7 and and then the desperado Rook of black would deliver all types
of checks until the end of the universe which just results to a draw.

regards

Thanks for the comment, Mike.

Yep, I was aware that black will try to create a light-square blockade via ...Rc8/...Bc6 - but how does he make progress after that?

Remarkably, it seems to me as though white can make more progress than black at least, and there are a lot of scenarios black must sidestep to avoid being dominated by an inferior force.

You know what's funny?

1.a8=B didn't even occur to me, but Re6 came immediately.

Strange wiring on my brain I guess.

I probably could have been a decent chessplayer if I played more boring moves and wasn't so obsessed with "art" haha.

Anyway, in an OTB game I'd probably play Re6-e7 anyway, looks like there's lots of chances for black to mess up, while underpromoting to bishop just makes it a complicated ending.

Joerg Oster · Post by **Joerg Oster** » Sun Jul 09, 2017 3:07 pm

Paloma wrote:
Joerg Oster wrote: What's the continuation after 4. .. Rb2xc2 by Black? Still mate?
Yes

[d] r7/1NP1N1Kp/pnQ1P1b1/5p2/3kn2p/p4BP1/1rPPp2q/8 b - - 0 4

4... Rxc2 5.Qxb6+ Kd3 6.Qe3+ Kc4 7.Bxe4 11#

Thank you.

I didn't have the patience yesterday to wait for a definite result from Stockfish.
Now that it's clear it's not an easy mate in 7, no surprise engines need a bit longer to fully resolve.

Eelco de Groot · Post by **Eelco de Groot** » Mon Jul 10, 2017 12:39 pm

Arpad Rusz wrote:The following study has at least five variations with queen sacrifices which makes it hard for the engines. White wins!

[pgn][Event "StrateGems"]
[Site "?"]
[Date "2015.??.??"]
[Round "?"]
[White "Wieland Bruch (after G .Heathcote)"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "r7/1QpnN1Kp/p3P1b1/Nn1P1p2/3k3p/p4BP1/1rPPp2q/8 w - - 0 0"]
[PlyCount "13"]

1. d6 Nb6 2. dxc7 Nd6 3. Qc6 Ne4 (3... Ndc4 4. Qb5 $1 Rxb5 5. Nec6+ Kc5 6. Nb7#
) 4. Nb7 e1=Q (4... Ke5 5. Qd6+ $1 Nxd6 6. Nc6+ Kxe6 7. Nc5#) (4... Rb5 5. Qc3+
$1 Nxc3 6. Nc6+ Kc4 7. d3#) (4... Qxg3 5. Qd5+ $1 Nxd5 6. Nc6+ Kc4 7. Bxe2+ Qd3
8. Bxd3#) 5. Qc5+ $1 Nxc5 6. Nc6+ Kc4 7. Nd6# 1-0[/pgn]

Probably a good test of your LMR and LMP. I ended up with a PV that looked promising after a lot of FHs in the right direction

43/85 736:37 +M25 1.d6 Nb6 2.dxc7 Kc5 {?!?} 3.Qxa8 Nxa8
4.Nb7+ Kb6 5.c8Q Nbc7 6.Qd8 Qg1
7.Nc8+ Kb5 8.Qd7+ Kb4 9.Qd6+ Ka4
10.Qf4+ Rb4 11.Bc6+ Nb5 12.Bxb5+ axb5
13.Qb8 Qd4+ 14.Kg8 (544.088.060.422) 12310

best move: d5-d6 time: 736:37.484 min n/s: 12.310.425 nodes: 544.088.060.422

Unfortunately, 2... Kc5 is actually only good for postponing the inevitable mate to #13:

After 2...Kc5

[D]r7/1QP1N1Kp/pn2P1b1/Nnk2p2/7p/p4BP1/1rPPp2q/8 w - -

45/42 74:59 +M13 3.Nd5 Nd4 4.Qxa8 Nc8 5.Qxc8 Be8
6.Qxe8 Qxg3+ 7.Kh8 Qe5+ 8.Kxh7 Qxc7+
9.Nxc7 Rb6 10.Qf8+ Rd6 11.Nb7+ Kb6
12.Qxd6+ Nc6 13.Qxc6+ Ka7 14.Nd6 e1Q
15.Qb7+ (32.537.781.398) 7231

So even though the Fail Highs were correct, the PV wasn't. But now I have an update (bugfix) that probably is better, only I have not let it run to that depth yet and is still failing high. But I don't think it will produce the above horrible PV anymore.

r7/1QpnN1Kp/p3P1b1/Nn1P1p2/3k3p/p4BP1/1rPPp2q/8 w - -

Engine: Ancalagon_017 HT (i 6700, 512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott

18/37 0:01 -3.95 1.Qxa8 e1Q 2.Nec6+ Kc5 3.Nb7+ Kb6
4.exd7 Rxc2 5.Nd6 Qa1+ 6.d4 Rxc6
7.Qxc6+ Ka5 8.Nb7+ Kb4 9.Qc5+ Kb3
10.d6 cxd6 11.Bd5+ Kb2 12.Qb4+ Kc2
13.d8Q Qxd4+ 14.Qxd4 (18.435.470) 12661

19/37 0:01 -4.26 1.Qxa8 e1Q 2.Nec6+ Kc5 3.Nb7+ Kb6
4.exd7 Rxc2 5.Nd6 Qa1+ 6.d4 Rxc6
7.Qxc6+ Ka5 8.Nb7+ Kb4 9.Qc5+ Kb3
10.d6 Qc3 11.d8Q cxd6 12.Qxc3+ Nxc3
13.Na5+ Ka4 14.Qxd6 (20.229.162) 12643
.
.
.
23/49 0:24 -6.00-- 1.Qxa8 e1Q (313.599.300) 13040

23/49 0:43 -5.83++ 1.Qxa8 e1Q 2.Nec6+ Kc5 3.Nb7+ Kb6
4.exd7 Rxc2 5.Nd6 Qa1+ 6.d4 Rxc6
7.Qxc6+ Ka5 8.Nb7+ Kb4 9.Qc5+ Kb3
10.Na5+ Ka2 11.d8Q Qxd4+ 12.Qxd4 Nxd4
13.Qxc7 Qb2 14.Qc4+ (559.102.918) 12968

23/49 1:12 -6.05-- 1.Qxa8 e1Q 2.Nec6+ Kc5 3.Nb7+ Kb6
4.exd7 Rxc2 5.Nd6 Qhxd2 6.d8Q Qc3+
7.Kg8 Bf7+ 8.Kxh7 Bg8+ 9.Qxg8 Qxf3
10.Nc8+ Kc5 11.Qf8+ Kc4 12.Qxa6 Qh5+
13.Qh6 (918.149.724) 12737

23/49 1:16 -6.54-- 1.Qxa8 e1Q (975.361.728) 12734

23/49 1:48 -6.14++ 1.d6 {with some search luck, it does not really see this accurately}(1.374.784.984) 12661

23/49 1:58 -5.35++ 1.d6 (1.490.495.241) 12554

23/49 2:01 -4.33++ 1.d6 (1.517.254.204) 12538

23/49 2:21 -3.04++ 1.d6 (1.755.202.437) 12433

23/49 2:24 -1.41++ 1.d6 (1.792.277.688) 12406

23/49 2:33 -1.35 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4
4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2
7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Be2 Qxg3
10.Qxf1+ Kh2 11.Kf8 Rxc2 12.Nc4 a2
13.Nxb6 Rxc7 14.Nbd5 (1.902.015.335) 12375

24/49 2:54 -1.27++ 1.d6 (2.142.665.010) 12291

24/49 2:54 -1.20++ 1.d6 (2.145.487.040) 12291

24/49 3:13 -1.27-- 1.d6 Nb6 2.dxc7 (2.379.639.069) 12307

24/49 3:20 -1.43-- 1.d6 Nb6 (2.477.691.453) 12360

24/49 3:20 -1.64-- 1.d6 Nb6 (2.482.080.729) 12361

24/49 3:21 -1.92-- 1.d6 Nb6 (2.488.736.949) 12364

24/49 3:22 -2.29-- 1.d6 Nb6 (2.509.873.025) 12375

24/49 3:26 -2.77-- 1.d6 Nb6 (2.563.570.775) 12387

24/49 3:39 -3.00 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4
4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2
7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Qxc2
10.Qd4+ Qf2 11.Qxf2+ Kxf2 12.e7 a2
13.e8Q a1Q 14.Nc4 (2.737.811.206) 12473

25/49 4:18 -3.08-- 1.d6 Nb6 2.dxc7 (3.274.709.993) 12660

25/49 4:41 -3.15-- 1.d6 Nb6 2.dxc7 (3.578.547.474) 12713

25/49 4:56 -3.26-- 1.d6 Nb6 (3.802.656.566) 12816

25/54 5:11 -3.41-- 1.d6 Nb6 (4.002.060.876) 12867

25/54 5:32 -3.51 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4
4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2
7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Qxc2
10.Qd4+ Qf2 11.Qxf2+ Kxf2 12.e7 a2
13.Nc4 a1Q 14.e8Q (4.309.598.054) 12942

26/54 5:41 -3.58-- 1.d6 Nb6 2.dxc7 (4.430.787.219) 12960

26/54 6:15 -3.65-- 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4
4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2
7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Qxc2
10.Qd4+ Qf2 11.Qxf2+ Kxf2 12.Nc4 hxg6
13.e7 a2 14.Kxg6 (4.876.992.492) 12973

26/63 6:23 -3.76-- 1.d6 Nb6 (4.985.425.676) 12983

26/63 6:30 -3.91-- 1.d6 Nb6 (5.071.578.930) 12980

26/63 6:30 -3.78++ 1.d6 (5.073.116.730) 12980

26/63 6:31 -3.95-- 1.d6 Nb6 2.dxc7 (5.083.546.317) 12979

26/63 6:40 -4.28 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4
4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2
7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Qxc2
10.e7 Qxd1 11.Bxd1 a2 12.e8Q a1Q
13.Qe5 hxg6 14.Qd4+ (5.203.313.361) 12980

27/63 7:46 -4.21++ 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4
4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2
7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Qxc2
10.e7 Qxd1 11.Bxd1 a2 12.Nf4 a1Q
13.e8Q Qxd1 14.Qe5 (6.052.789.655) 12967

27/63 7:47 -4.14++ 1.d6 (6.058.222.728) 12966

27/63 7:50 -4.03++ 1.d6 (6.098.446.492) 12960

27/63 7:56 -4.12-- 1.d6 Nb6 (6.176.885.571) 12957

27/63 8:36 -4.33-- 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4
4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2
7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Qxc2
10.Kxh7 Qxd1 11.Bxd1 a2 12.e7 a1Q
13.e8Q (6.708.561.303) 12997

27/63 8:42 -4.42 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4
4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2
7.Qxe2+ Kg1 8.Qe1+ Nf1 9.Nxg6 Rxc2
10.Nc6 Qxg3 11.Qxg3+ hxg3 12.e7 a2
13.e8Q a1Q+ 14.Nge5 (6.788.845.974) 12988

28/63 9:10 -4.35++ 1.d6 (7.147.665.215) 12981

28/63 9:30 -4.27++ 1.d6 (7.387.473.927) 12959

28/63 9:53 -4.35-- 1.d6 Nb6 (7.686.575.005) 12956

28/63 10:04 -4.25++ 1.d6 (7.828.482.851) 12954

28/63 10:13 -4.04++ 1.d6 (7.940.194.496) 12951

28/63 10:54 -4.21-- 1.d6 Nb6 2.dxc7 (8.472.557.825) 12948

28/63 11:15 -3.98++ 1.d6 (8.749.484.413) 12948

28/63 11:38 -4.28-- 1.d6 Nb6 (9.049.833.705) 12949

28/63 13:31 -4.91-- 1.d6 Nb6 2.dxc7 (10.555.255.073) 13000

28/63 13:43 -4.82 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4
4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2
7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Qxc2
10.e7 Qxd1 11.Bxd1 a2 12.e8Q a1Q
13.Qe5 hxg6 14.gxh4 (10.707.676.179) 13003

29/63 14:06 -4.89-- 1.d6 Nb6 2.dxc7 (11.001.163.187) 13002

29/63 14:35 -4.96-- 1.d6 Nb6 (11.396.088.671) 13014

29/63 16:54 -5.07-- 1.d6 Nb6 2.dxc7 (13.253.374.387) 13062

29/63 18:33 -5.22-- 1.d6 Nb6 2.dxc7 (14.554.512.225) 13075

29/63 18:33 -5.10++ 1.d6 (14.564.969.573) 13075

29/63 18:34 -4.82++ 1.d6 (14.571.647.015) 13074

29/63 18:36 -4.45++ 1.d6 (14.593.890.605) 13073

29/63 18:39 -4.74-- 1.d6 Nb6 (14.639.246.222) 13073

29/63 18:51 -4.92 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4
4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2
7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Qxc2
10.e7 Qxd1 11.Bxd1 a2 12.e8Q a1Q
13.Qe5 hxg6 14.gxh4 (14.790.096.663) 13068

30/63 19:22 -5.00-- 1.d6 Nb6 (15.191.837.271) 13062

30/63 20:01 -4.92++ 1.d6 (15.693.005.303) 13062

30/63 20:50 -5.00-- 1.d6 Nb6 2.dxc7 (16.352.309.874) 13080

30/63 21:44 -5.15-- 1.d6 Nb6 (17.096.859.050) 13110

30/63 22:28 -5.02++ 1.d6 (17.710.912.745) 13133

30/63 22:43 -4.74++ 1.d6 (17.898.942.034) 13126

30/63 22:46 -4.37++ 1.d6 (17.933.433.357) 13124

30/63 23:09 -3.89++ 1.d6 (18.208.616.275) 13104

30/63 23:41 -4.27-- 1.d6 Nb6 2.dxc7 (18.615.432.469) 13095

30/67 24:23 -5.07-- 1.d6 Nb6 (19.182.717.895) 13106

30/70 29:28 -5.19 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4
4.Qxa8 Nxd2 5.Qd8+ Ke3 6.Qd3+ Kf2
7.Qxe2+ Kg1 8.Qe1+ Nf1 9.Nxg6 Rxc2
10.Nc6 Qxg3 11.Qxg3+ hxg3 12.e7 a2
13.e8Q a1Q+ 14.Nge5 (23.188.534.889) 13114

31/70 30:04 -5.26-- 1.d6 Nb6 (23.676.185.596) 13123

31/70 30:45 -5.33-- 1.d6 Nb6 (24.250.348.471) 13137

31/70 32:34 -5.44-- 1.d6 Nb6 (25.723.741.106) 13160

31/70 33:50 -5.60-- 1.d6 Nb6 (26.715.889.883) 13157

31/70 34:10 -5.47++ 1.d6 (26.977.072.723) 13156

31/70 35:17 -5.19++ 1.d6 (27.864.330.040) 13159

31/70 36:23 -5.41-- 1.d6 Nb6 (28.720.314.821) 13152

31/70 36:47 -5.52 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4
4.Qxa8 Nxd2 5.Qxa6 Ke3 6.Qd3+ Kf2
7.Qxe2+ Kg1 8.Qd1+ Nf1 9.Nxg6 Qxc2
10.e7 Qxd1 11.Bxd1 a2 12.e8Q a1Q
13.Qe5 hxg6 14.gxh4 (29.045.605.941) 13155

32/70 37:30 -5.45++ 1.d6 (29.618.718.369) 13159

32/70 43:38 -5.52-- 1.d6 Nb6 2.dxc7 (34.414.879.972) 13143

32/70 45:08 -5.63-- 1.d6 Nb6 (35.639.637.892) 13156

32/70 48:32 -5.54++ 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4
4.Qxa8 Nxd2 5.Qd8+ Ke3 6.Qd3+ Kf2
7.Qxe2+ Kg1 8.Qe3+ Qf2 9.Qxa3 Rxc2
10.Qa1+ Kh2 11.Bc6 Bh5 12.gxh4 Qg3+
13.Kf8 Ne4 14.c8Q (38.262.260.594) 13139

32/70 48:55 -5.33++ 1.d6 (38.537.996.531) 13130

32/70 49:11 -5.04++ 1.d6 (38.732.466.458) 13122

32/70 49:16 -4.67++ 1.d6 (38.792.383.286) 13120

32/70 49:25 -4.19++ 1.d6 (38.895.207.362) 13117

32/70 49:36 -3.56++ 1.d6 (39.027.984.247) 13112

32/70 49:58 -2.77++ 1.d6 (39.291.581.470) 13103

32/70 50:41 -1.75++ 1.d6 (39.786.288.676) 13082

32/70 55:38 -0.46++ 1.d6 (43.219.947.021) 12945

32/70 57:33 0.00 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ndc4 4.Qb5 {!} Rxc2
5.Qb3 Ke5 6.Nxc4+ Rxc4 7.Qe3+ Re4
8.Bxe4 e1Q 9.Nxg6+ hxg6 10.d4+ Kd6
11.Qxa3+ Kxe6 12.Qb3+ Kd7 13.Qf7+ Kd6
14.Qf6+ (44.670.686.455) 12934

33/70 65:40 +0.07++ 1.d6 (50.489.047.649) 12812

33/70 67:11 +0.14++ 1.d6 (51.580.047.424) 12794

33/70 68:37 +0.25++ 1.d6 (52.585.405.992) 12770

33/70 68:49 +0.40++ 1.d6 (52.718.243.267) 12766

33/70 69:07 +0.61++ 1.d6 (52.922.603.888) 12760

33/70 69:15 +0.89++ 1.d6 (53.014.753.023) 12757

33/70 71:53 +1.27++ 1.d6 (54.847.658.558) 12716

33/70 72:38 +1.75++ 1.d6 (55.381.626.862) 12707

33/70 76:12 +2.37++ 1.d6 (57.985.356.820) 12681

33/70 79:49 +3.17++ 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ne8+ 4.Kh6 hxg3+
5.Kg5 Qh4+ 6.Kxh4 Ke5 7.Bxe2 g2
8.Qxg2 a2 9.Nac6+ Kxe6 10.Nxg6 hxg6
11.Qxg6+ Kd7 12.Qxf5+ Kxc6 13.Bf3+ Kxc7
14.Qc5+ (60.605.552.321) 12654
.
.
.
38/82 222:06 +8.19 1.d6 Nb6 2.dxc7 Nd6 3.Qc6 Ne8+ 4.Kh6 hxg3+
5.Kg5 Qh4+ 6.Kxh4 Ke5 7.Bxe2 g2
8.Qxg2 a2 9.Nc4+ Kxe6 10.Nxg6 a1Q
11.Qxa8 Qe1+ 12.Kh3 Nxa8 13.c8Q+ Kf6
14.Qd8+ (176.575.463.687) 13249

MikeB · Post by **MikeB** » Tue Jul 11, 2017 4:26 am

Nordlandia wrote:Sokolsky - Ravinsky, USSR 1938 (or 1933)

a8=B is supposed to win, however no engine see a breakthrough.

[d]4b1k1/P4pPp/1R3P1P/2r5/8/1P6/1K6/8 w - - 0 0

https://timkr.home.xs4all.nl/chess2/minor.htm

a8=B wins - took about a 20 second training session with SF McB 2.6 to see a breakthrough...

link to source and all flavors of exe's https://github.com/MichaelB7/Stockfish/releases/tag/2.6

Code: Select all

dep	score	nodes	time	&#40;not shown&#58;  tbhits	knps	seldep&#41;  63	+128.32 	5.82G	2&#58;51.10	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 Bb5 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 62	+128.32 	5.68G	2&#58;47.21	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 Bb5 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 61	+128.32 	5.02G	2&#58;28.77	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 Bb5 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 60	+128.32 	4.47G	2&#58;13.02	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 Bb5 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 59	+128.32 	4.29G	2&#58;07.95	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 Bb5 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 58	+128.32 	3.73G	1&#58;53.14	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 Bb5 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 57	+128.32 	3.70G	1&#58;52.35	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 Bb5 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 56	+128.32 	3.34G	1&#58;41.71	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 Bb5 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 55	+128.32 	3.28G	1&#58;40.00	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 Bb5 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 54	+128.32 	3.00G	1&#58;31.76	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 Bb5 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 53	+128.32 	2.74G	1&#58;24.16	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 Bb5 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 52	+128.32 	2.68G	1&#58;22.25	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 Bb5 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 51	+128.32 	2.56G	1&#58;18.59	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 Bb5 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
50	+128.32 	2.35G	1&#58;12.63	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 Bb5 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 49	+128.32 	2.28G	1&#58;10.58	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 Bb5 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 48	+128.32 	2.25G	1&#58;09.74	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 Bb5 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 

 47	+128.32 	2.09G	1&#58;05.28	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 Bb5 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 46	+128.32 	2.09G	1&#58;05.19	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 Bb5 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 45	+128.32 	1.98G	1&#58;01.98	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Kf7 Bb5 Rc8+ Kd4 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 44	+128.32 	1.87G	0&#58;58.99	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Kf7 Bb5 Rc8+ Kd4 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 43	+128.32 	1.86G	0&#58;58.62	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Kf7 Bb5 Rc8+ Kd4 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 42	+128.32 	1.76G	0&#58;55.72	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Kf7 Bb5 Rc8+ Kd4 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 41	+128.32 	1.72G	0&#58;54.31	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Kf7 Bb5 Rc8+ Kd4 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 40	+128.32 	1.69G	0&#58;53.50	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Kf7 Bb5 Rc8+ Kd4 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 39	+128.32 	1.69G	0&#58;53.48	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Kf7 Bb5 Rc8+ Kd4 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 38	+128.32 	1.69G	0&#58;53.48	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Kf7 Bb5 Rc8+ Kd4 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 37	+128.32 	1.69G	0&#58;53.48	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Kf7 Bb5 Rc8+ Kd4 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 36	+128.32 	1.69G	0&#58;53.47	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Kf7 Bb5 Rc8+ Kd4 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 35	+128.32 	1.69G	0&#58;53.47	a8=B Rc8 Be4 Bd7 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Kf7 Bb5 Rc8+ Kd4 Rd8+ Kc5 Rc8+ Kd6 Kxf6 Bd3 Rd8+ Kc6 Ke7 Bxh7 Rc8+ Kb7 Rc3 g8=Q Rxb3+ Kc6 Rc3+ Kb5 Rb3+ Kc4 Rf3 Qg5+ Ke8 Bg8 Kd7 Bxe6+ 
 35	+126.97!	1.59G	0&#58;50.15	a8=B! 
 35	+115.66?	1.59G	0&#58;50.12	a8=B Rc8? 
 35	+127.10!	1.41G	0&#58;44.30	a8=B! 
 35	+124.51!	1.40G	0&#58;44.03	a8=B! 
 35	+122.45!	1.39G	0&#58;43.90	a8=B! 
 35	+120.81!	1.39G	0&#58;43.88	a8=B! 
 35	+119.52!	1.39G	0&#58;43.86	a8=B! 
 35	+118.51!	1.39G	0&#58;43.85	a8=B! 
 35	+117.71!	1.39G	0&#58;43.83	a8=B! 
 35	+117.08!	1.39G	0&#58;43.77	a8=B! 
 35	+105.42?	1.38G	0&#58;43.51	a8=B Rc8? 
 35	+123.90!	1.38G	0&#58;43.51	a8=B! 
 35	+123.62!	1.37G	0&#58;43.28	a8=B! 
 35	+68.37?	1.37G	0&#58;43.25	a8=B Rc8? 
 35	+128.28!	1.35G	0&#58;42.57	a8=B! 
 35	+128.17!	1.35G	0&#58;42.46	a8=B! 
 35	+90.56?	1.32G	0&#58;41.50	a8=B Rc8? 
 34	+128.17 	1.32G	0&#58;41.45	a8=B Rf5 Be4 Rf1 Bd5 Rd1 Rd6 Re1 Ka3 Rb1 Kb4 Rc1 Rd8 Rc4+ Ka3 Ra4+ Kb2 Re4 Rc8 Re2+ Ka3 Re1 Rd8 Re4 Ra8 Re1 Kb4 Re4+ Kc5 Re2 Kd6 Re4 Rb8 Re7 Bxf7+ Kxf7 g8=Q+ Kxf6 Qf8+ Kg5 Qxe7+ Kf4 
 34	+109.40!	1.09G	0&#58;34.26	a8=B! 
 34	+84.63!	983.9M	0&#58;30.98	a8=B! 
 34	+70.19?	982.8M	0&#58;30.94	a8=B Re5? 
 34	+82.21!	977.7M	0&#58;30.77	a8=B! 
 34	+72.88?	976.6M	0&#58;30.74	a8=B Re5? 
 34	+80.66!	950.2M	0&#58;29.91	a8=B! 
 34	+72.60!	841.5M	0&#58;26.56	a8=B! 
 34	+66.16!	704.5M	0&#58;22.44	a8=B! 
 34	+61.03!	690.2M	0&#58;21.99	a8=B! 
 34	+53.78?	689.4M	0&#58;21.96	a8=B Rf5? 
 34	+61.71!	657.8M	0&#58;21.00	a8=B! 
 34	+59.12!	654.6M	0&#58;20.89	a8=B! 
 34	+47.85?	653.9M	0&#58;20.87	a8=B Re5? 
 34	+59.21?	651.7M	0&#58;20.80	a8=B Rh5? 
 34	+60.53!	651.2M	0&#58;20.78	a8=B! 
 34	+59.51!	650.2M	0&#58;20.75	a8=B! 
 34	+58.30?	648.2M	0&#58;20.69	a8=B Rh5? 
 34	+59.72!	647.8M	0&#58;20.68	a8=B! 
 34	+59.23!	644.6M	0&#58;20.58	a8=B! 
 34	+58.86!	643.0M	0&#58;20.52	a8=B! 
 34	+58.58!	641.8M	0&#58;20.48	a8=B! 
 34	+48.24?	640.6M	0&#58;20.44	a8=B Rh5? 
 34	+58.47?	639.5M	0&#58;20.41	a8=B Rf5? 
 34	+59.04!	635.8M	0&#58;20.29	a8=B! 
 34	+58.16?	633.9M	0&#58;20.23	a8=B Rh5? 
 33	+59.04 	625.6M	0&#58;19.96	a8=B Rg5 Be4 Re5 Bd3 Rh5 Bc4 Rf5 Kc3 Rf2 Kb4 Rf4 Rd6 Re4 Kc5 Rh4 b4 Rh5+ Bd5 Bd7 b5 Re5 b6 Rg5 Kd4 Rg4+ Be4 Rg1 b7 Be8 Bd5 Rc1 Rd8 Re1 Kc5 Re5 Kb6 Re7 Bxf7+ Kxf7 fxe7 Kf6 Rxe8 Ke5 g8=Q Kf4 
 33	+46.81!	571.2M	0&#58;18.26	a8=B! 
 33	+38.06?	566.6M	0&#58;18.11	a8=B Ra5? 
 33	+45.30!	492.8M	0&#58;15.78	a8=B! 
 33	+37.24!	475.7M	0&#58;15.24	a8=B! 
 33	+31.46?	474.5M	0&#58;15.20	a8=B Bd7? 
 33	+36.63!	448.2M	0&#58;14.39	a8=B! 
 33	+32.54!	442.4M	0&#58;14.22	a8=B! 
 33	+32.41!	429.4M	0&#58;13.80	a8=B! 
 33	+29.80?	428.7M	0&#58;13.78	a8=B Ra5? 
 33	+32.13!	417.0M	0&#58;13.42	a8=B! 
 33	+30.84!	409.9M	0&#58;13.20	a8=B! 
 33	+29.83!	405.4M	0&#58;13.05	a8=B! 
 33	+29.03!	403.2M	0&#58;12.98	a8=B! 
 33	+28.33?	402.3M	0&#58;12.95	a8=B Rf5? 
 33	+29.63!	398.8M	0&#58;12.84	a8=B! 
 33	+29.35!	392.3M	0&#58;12.63	a8=B! 
 33	+29.14!	382.9M	0&#58;12.33	a8=B! 
 33	+28.98!	378.1M	0&#58;12.19	a8=B! 
 33	+28.87!	373.3M	0&#58;12.03	a8=B! 
 33	+26.68?	364.3M	0&#58;11.75	a8=B Rf5? 
 32	+28.87 	359.1M	0&#58;11.58	a8=B Rf5 Be4 Rh5 Kc3 Re5 Kd4 Rh5 Bd5 Rh4+ Kc3 Rh3+ Kb4 Rh4+ Ka3 Rf4 Rd6 Rg4 Ra6 Rg1 Rb6 Rd1 Bc4 Ra1+ Kb4 Ra8 Rb7 Rc8 Bd5 Bd7 Bxf7+ Kxf7 Rxd7+ Ke6 f7 Rb8+ Ka3 Kxd7 Kb2 
 32	+27.59!	349.4M	0&#58;11.28	a8=B! 
 32	+26.58!	342.4M	0&#58;11.05	a8=B! 
 32	+25.78!	322.0M	0&#58;10.41	a8=B! 
 32	+25.15!	315.0M	0&#58;10.18	a8=B! 
 32	+24.67!	305.9M	0&#58;09.89	a8=B! 
 32	+24.30!	299.7M	0&#58;09.69	a8=B! 
 32	+20.51?	298.1M	0&#58;09.63	a8=B Rc8? 
 32	+24.33!	296.2M	0&#58;09.58	a8=B! 
 32	+24.18!	294.2M	0&#58;09.52	a8=B! 
 32	+23.51?	292.7M	0&#58;09.47	a8=B Rb5? 
 32	+24.05?	288.8M	0&#58;09.35	a8=B Rh5? 
 31	+24.38 	285.4M	0&#58;09.23	a8=B Rh5 Be4 Rh4 Bd5 Rd4 Rd6 Rb4 Ra6 Rd4 Bc4 Rd1 Kc3 Bc6 Rb6 Re1 Bd5 Re3+ Kd4 Re8 Bxf7+ Kxf7 Rxc6 Rd8+ Kc3 Kg8 b4 Re8 b5 Ra8 b6 Ra4 Rc8+ Kf7 g8=Q+ Kxf6 Qd8+ Kf7 Qf8+ Kg6 Qe8+ Kg5 Qxa4 Kf5 
 31	+22.90!	249.0M	0&#58;08.08	a8=B! 
 31	+21.61!	227.5M	0&#58;07.37	a8=B! 
 31	+20.87?	227.0M	0&#58;07.36	a8=B Re5? 
 31	+21.47!	194.2M	0&#58;06.31	a8=B! 
 31	+20.84!	167.1M	0&#58;05.42	a8=B! 
 31	+20.78!	153.8M	0&#58;04.99	a8=B! 
 31	+20.74!	147.6M	0&#58;04.78	a8=B! 
 31	+20.51?	133.8M	0&#58;04.33	a8=B Rc8? 
 31	+20.58!	125.2M	0&#58;04.05	a8=B! 
 30	+20.51!	105.4M	0&#58;03.39	a8=B! 
 30	+18.82?	105.1M	0&#58;03.38	a8=B Rc7? 
 29	+20.51!	104.2M	0&#58;03.35	a8=B! 
 29	+18.24?	102.6M	0&#58;03.29	a8=B Rc7? 
 28	+20.51 	98.8M  	0&#58;03.16	a8=B Rf5 Be4 Rf2+ Kc3 Rf1 Bd5 Rd1 Bc4 Rd8 Rb7 Bd7 Bd5 Rc8+ Kb2 Rd8 Rc7 Be8 Re7 Rc8 b4 Rb8 Kc3 Rd8 Bc4 Rc8 Kd4 Rd8+ Ke5 Ra8 b5 Rd8 b6 Rc8 Bd5 Rd8 Bb3 Rc8 b7 Rb8 Bd5 Rd8 Bc4 Rb8 Kd6 
 27	+13.91 	40.8M  	0&#58;01.29	a8=B Re5 Bf3 Rg5 Be4 Rh5 Kc3 Rc5+ Kd4 Rc8 Rb7 Rd8+ Kc3 Bd7 Bd5 Rc8+ Kb2 Rd8 Bc4 Be8 Kc3 Rc8 Kb4 Ra8 Bd5 Rd8 Re7 Rc8 Ka3 Rb8 Kb2 Rc8 Rb7 Rd8 Be4 Rd2+ Kc3 
 26	+13.68 	12.8M  	0&#58;00.39	a8=B Re5 Bf3 Rg5 Be4 Rh5 Kc3 Rh3+ Kd4 Rh5 Bd5 Rh4+ Kc3 Rh3+ Kb2 Rd3 Rd6 Re3 Ka3 Re2 Kb4 Rc2 Bc4 Rc1 Rb6 Rc2 Bxf7+ Kxf7 Rb7+ Kxf6 g8=Q Bh5 
 25	+8.28 	4.74M  	0&#58;00.14	Ra6 Rc8 b4 Rd8 Ra5 Bc6 b5 Rd2+ Ka3 Rd3+ Kb4 Rd4+ Kc3 Rd8 Kb3 Be8 b6 Bc6 Rc5 Be4 Rc3 Bd5+ Kb4 Re8 Rc7 Bf3 Re7 Rd8 Ka4 Bc6+ Ka3 
 24	+8.28 	4.68M  	0&#58;00.14	Ra6 Rc8 b4 Rd8 Ra5 Bc6 b5 Rd2+ Ka3 Rd3+ Kb4 Rd4+ Kc3 Rd8 Kb3 Be8 b6 Bc6 Rc5 Be4 Rc3 Bd5+ Kb4 Re8 Rc7 Bf3 Re7 Rd8 Ka4 Bc6+ Ka3 
 23	+8.28 	4.65M  	0&#58;00.14	Ra6 Rc8 b4 Rd8 Ra5 Bc6 b5 Rd2+ Ka3 Rd3+ Kb4 Rd4+ Kc3 Rd8 Kb3 Be8 b6 Bc6 Rc5 Be4 Rc3 Bd5+ Kb4 Re8 Rc7 Bf3 Rd7 Rc8 b7 
 22	+8.28 	4.62M  	0&#58;00.14	Ra6 Rc8 b4 Rd8 Ra5 Bc6 b5 Rd2+ Ka3 Rd3+ Kb4 Rd4+ Kc3 Rd8 Kb3 Be8 b6 Bc6 Rc5 Be4 Rc3 Bd5+ Kb4 Re8 Rc7 Bf3 Rd7 Rc8 b7 
 21	+8.28 	4.60M  	0&#58;00.14	Ra6 Rc8 b4 Rd8 Ra5 Bc6 b5 Rd2+ Ka3 Rd3+ Kb4 Rd4+ Kc3 Rd8 Kb3 Be8 b6 Bc6 Rc5 Be4 Rc3 Bd5+ Kb4 Re8 Rc7 Bf3 Rd7 Rc8 b7 
 20	+8.28 	4.58M  	0&#58;00.14	Ra6 Rc8 b4 Rd8 Ra5 Bc6 b5 Rd2+ Ka3 Rd3+ Kb4 Rd4+ Kc3 Rd8 Kb3 Be8 b6 Bc6 Rc5 Be4 Rc3 Bd5+ Kb4 Re8 Rc7 Bf3 Rd7 Rc8 
 19	+12.70 	2.77M  	0&#58;00.08	a8=B Re5 Bf3 Rb5 Rxb5 Bxb5 Be4 Bf1 Kc3 Bb5 Kd4 Bf1 Bxh7+ Kxh7 Kc5 Kg8 b4 Bg2 Kd6 Be4 Kc5 Bf3 b5 Kh7 Kd6 
 18	+13.03 	2.21M  	0&#58;00.06	a8=B Re5 Bf3 Rb5 Rxb5 Bxb5 Be4 Bf1 Bxh7+ Kxh7 Kc3 Ba6 Kd4 Kg8 Kd5 Bf1 Kd6 Be2 b4 Bc4 Ke7 Kh7 Kf8 
 17	+8.28 	674989	0&#58;00.02	Ra6 Rc8 b4 Rd8 Ra5 Bc6 b5 Rd2+ Ka3 Rd3+ Kb4 Rd4+ Kc3 Rd8 Kb3 Be8 b6 Bc6 Rc5 Be4 Rc3 Bd5+ Kb4 Re8 
 16	+12.12 	275996	0&#58;00.01	a8=B Rc8 Be4 Rd8 Rb7 Rd7 Rxd7 Bxd7 Bxh7+ Kxh7 Kc3 Kg8 Kd4 Bc6 Kc4 Be4 b4 Bh1 Kc5 Kh7 Kd6 Bb7 Ke7 Bd5 
 15	+8.28 	103617	0&#58;00.00	Ra6 Rc8 b4 Rd8 Ra5 Bc6 b5 Rd2+ Ka3 Rd3+ Kb4 Rd4+ Kc3 Rd8 Kb3 Be8 Kb4 Ra8 b6 Bc6 Kc5 Bh1 Ra1 Bf3 
 14	+8.28 	93134  	0&#58;00.00	Ra6 Rc8 b4 Rd8 Ra5 Bc6 b5 Rd2+ Ka3 Rd3+ Kb4 Rd4+ Kc3 Rd8 Kb3 Be8 Ra2 Ra8 b6 Ba4+ Kb4 
 13	+8.28 	84207  	0&#58;00.00	Ra6 Rc8 b4 Rd8 b5 Rd2+ Kc3 Rd8 Ra5 Bc6 Kb3 Be8 Ra2 Ra8 b6 Ba4+ Kb4 Bc6 Rc2 
 12	+8.28 	75668  	0&#58;00.00	Ra6 Rc8 b4 Rd8 Ra5 Bc6 b5 Rd2+ Ka3 Rd3+ Kb4 Rd4+ Kc3 Rd8 Kb3 Be8 Ra2 Ra8 
 11	+8.28 	68225  	0&#58;00.00	Ra6 Rc8 b4 Rd8 Ra5 Bc6 b5 Rd2+ Kc3 Rd8 Kb3 Be8 Ra2 Ra8 
 10	+8.28 	42686  	0&#58;00.00	Ra6 Rc8 b4 Rd8 Ra5 Bc6 b5 Rd2+ Ka3 Rd3+ Kb4 Rd4+ Kc3 Rd8 Kc2 Re8 
  9	+8.28 	24001  	0&#58;00.00	b4 Rc4 Rb5 Rc8 Ra5 Rc6 Kb3 Rc8 b5 
  8	+8.28 	21467  	0&#58;00.00	b4 Rc4 Rb5 Rc8 Ra5 Rc6 Kb3 Rc8 
  7	+8.28 	12288  	0&#58;00.00	Ra6 Rc8 b4 Rd8 b5 Rd2+ Kb3 Rd3+ Kc2 
  6	+8.28 	10493  	0&#58;00.00	Ra6 Rc8 b4 Rd8 b5 Rd2+ Kb3 
  5	+8.28 	8623    	0&#58;00.00	Ra6 Rc8 b4 Rd8 b5 
  4	+8.28 	4090    	0&#58;00.00	Ra6 Rc8 b4 Rd8 
  3	+8.28 	3026    	0&#58;00.00	Ra6 Rc8 b4 
  2	+9.58 	1652    	0&#58;00.00	a8=Q Rc2+ Kb1 
  1	+9.65 	724      	0&#58;00.00	a8=Q

one way to do it:

[pgn][Event "Mac Pro x5690 3.46 Ghz 18 CPU"]
[Site "Mac-Pro.local"]
[Date "2017.07.10"]
[Round "-"]
[White "SF-McBrain 2.6 64 POPCNT"]
[Black "Komodo 11.01 64-bit"]
[Result "1-0"]
[TimeControl "360+6"]
[FEN "4b1k1/P4pPp/1R3P1P/2r5/8/1P6/1K6/8 w - - 0 1"]
[SetUp "1"]

1. a8=B {+128.32/60 +309} Rc8 {-5.00/35 +270} 2. Be4 {+5.41/27 +314} Bc6
{-4.57/35 +269} 3. Bxc6 {+128.35/49 +314} Ra8 {-250.00/43 +267} 4. Ba4
{+128.35/46 +319} Re8 {-250.00/43 +268} 5. Ka3 {+128.36/50 +239} Ra8
{-250.00/43 +269} 6. Re6 {+128.39/36 +243} fxe6 {-250.00/45 +264} 7. b4
{+128.40/43 +239} Kf7 {-250.00/45 +260} 8. Kb3 {+128.41/32 +243} Rc8
{-250.00/45 +251} 9. Bd7 {+128.41/42 +228} Rd8 {-250.00/46 +238} 10. Bc6
{+128.42/39 +232} Kg6 {-250.00/45 +239} 11. Be4+ {+128.43/40 +224} Kxh6
{-250.00/43 +239} 12. Bc2 {+128.44/41 +185} Rc8 {-250.00/45 +240} 13. Bd3
{+128.45/40 +188} Ra8 {-250.00/39 +236} 14. Bc4 {+128.45/38 +184} Rd8
{-250.00/37 +237} 15. Bxe6 {+128.46/37 +187} Rd3+ {-250.00/40 +235} 16. Ka4
{+128.47/38 +165} Rf3 {-250.00/41 +232} 17. g8=Q {+128.48/37 +167} Rf4
{-250.00/40 +233} 18. Qg7+ {+128.49/38 +162} Kh5 {-250.00/5 +238} 19. Qg4+
{+128.50/37 +162} Rxg4 {-250.00/63 +232} 20. Bxg4+ {+128.50/42 +160} Kg6
{-1000.16/27 +237} 21. b5 {+1000.12/39 +160} Kxf6 {-1000.12/29 +240} 22. b6
{+1000.11/40 +164} Kg5 {-1000.10/32 +244} 23. Bc8 {+1000.10/46 +158} h6
{-1000.09/35 +249} 24. b7 {+1000.09/52 +155} h5 {-1000.08/38 +253} 25. b8=Q
{+1000.08/46 +153} Kf6 {-1000.07/44 +257} 26. Qf4+ {+1000.07/50 +157} Kg6
{-1000.06/59 +262} 27. Be6 {+1000.06/68 +152} h4 {-1000.05/99 +267} 28.
Qxh4 {+1000.05/74 +154} Kg7 {-1000.04/5 +273} 29. Qg5+ {+1000.04/116 +76}
Kf8 {-1000.03/99 +279} 30. Qf6+ {+1000.03/127 +82} Ke8 {-1000.02/5 +285}
31. Qf7+ {+1000.02/127 +88} Kd8 {-1000.01/5 +291} 32. Qd7#
{+1000.01/127 +94}
{White mates} 1-0[/pgn]

MikeB · Post by **MikeB** » Tue Jul 11, 2017 4:51 am

if one plays
Ba8 , iSF-Mcb 2.6 will see that there is a tablebase mate in less than 5 minutes, ymmv.

Code: Select all

dep	score	nodes	time	&#40;not shown&#58;  tbhits	knps	seldep&#41;
 46	+128.33 	8.47G	4&#58;31.63	Rc8 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Kf7 Bb5 Rc8+ Kb2 Rd8 Bc6 Kg8 Ka3 Rc8 Bd7 Ra8+ Kb2 Kf7 Bc6 Rd8 Be4 Rd2+ Ka3 Rd1 Bxh7 Kxf6 g8=Q Ke7 Qg3 Ra1+ Kb2 Rd1 Qc7+ Rd7 Qxd7+ Kxd7 
 45	+128.33 	8.45G	4&#58;30.96	Rc8 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Kf7 Bb5 Rc8+ Kb2 Rd8 Bc6 Kg8 Ka3 Rc8 Bd7 Ra8+ Kb2 Kf7 Bc6 Rd8 Be4 Rd2+ Ka3 Rd1 Bxh7 Kxf6 g8=Q Ke7 Qg3 Ra1+ Kb2 Rd1 Qc7+ Rd7 Qxd7+ Kxd7 
 44	+128.33 	8.30G	4&#58;26.59	Rc8 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Kf7 Bb5 Rc8+ Kb2 Rd8 Bc6 Kg8 Ka3 Rc8 Bd7 Ra8+ Kb2 Kf7 Bc6 Rd8 Be4 Rd2+ Ka3 Rd1 Bxh7 Kxf6 g8=Q Ke7 Qg3 Ra1+ Kb2 Rd1 Qc7+ Rd7 Qxd7+ Kxd7 
 43	+128.33 	8.28G	4&#58;26.06	Rc8 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Kf7 Bb5 Rc8+ Kb2 Rd8 Bc6 Kg8 Ka3 Rc8 Bd7 Ra8+ Kb2 Kf7 Bc6 Rd8 Be4 Rd2+ Ka3 Rd1 Bxh7 Kxf6 g8=Q Ke7 Qg3 Ra1+ Kb2 Rd1 Qc7+ Rd7 Qxd7+ Kxd7 
 42	+128.33 	8.25G	4&#58;25.12	Rc8 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Kf7 Bb5 Rc8+ Kb2 Rd8 Bc6 Kg8 Ka3 Rc8 Bd7 Ra8+ Kb2 Kf7 Bc6 Rd8 Be4 Rd2+ Ka3 Rd1 Bxh7 Kxf6 g8=Q Ke7 Qg3 Ra1+ Kb2 Rd1 Qc7+ Rd7 Qxd7+ Kxd7 
 41	+128.32 	7.94G	4&#58;15.89	Rc8 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 b4 Rd8+ Ke3 Rc8 Kf4 Kxf6 Bc2 Rc4+ Ke3 Rc3+ Bd3 Kf7 Kd2 Ra3 Bxh7 Ke7 g8=Q Ra2+ Kd3 Ra3+ Ke4 Kd7 Bf5 Kc7 Bxe6 Ra7 Qg7+ Kb6 Qxa7+ 
 40	+128.32 	7.94G	4&#58;15.82	Rc8 Bd5 Bc6 Bxc6 Ra8 Ba4 Re8 Ka3 Ra8 Re6 fxe6 Kb2 Rd8 Kc3 Rc8+ Kd4 Kf7 b4 Rd8+ Ke3 Rc8 Kf4 Kxf6 Bc2 Rc4+ Ke3 Rc3+ Bd3 Kf7 Kd2 Ra3 Bxh7 Ke7 g8=Q Ra2+ Kd3 Ra3+ Ke4 Kd7 Bf5 Kc7 Bxe6 Ra7 Qg7+ Kb6 Qxa7+ 
 40	+116.33?	6.60G	3&#58;30.62	Re5 Bh1? 
 40	+106.77!	6.58G	3&#58;29.96	Re5!

A hard endgame (?) study

Re: A hard endgame (?) study

Re: A hard endgame (?) study

Re: A hard endgame (?) study

Re: A hard endgame (?) study

Re: A hard endgame (?) study

Re: A hard endgame (?) study

Re: A hard endgame (?) study

Re: A hard endgame (?) study

Re: A hard endgame (?) study

Re: A hard endgame (?) study