Old position I posted a while back

[Lyudmil Tsvetkov]

Winning according SF Dev.

[d]8/3R1pkp/5b2/5K2/5P2/8/7P/8 w - - 0 29

that is just a possible position.

you can reach similar one, but with black h and g pawns vs white h and g pawns, or white h and f pawns.

or alternatively, with added queens.

no one knows what those are.

I did not claim this was necessarily a draw, maybe it is, I am not certain and did not check it, my point was only to illustrate the tough struggle ahead and drawing possibilities.

[Lyudmil Tsvetkov]

Is this winning for white?

Queen is trapped.

Code: Select all

1. e4 c6 2. d4 d5 3. e5 Bf5 4. h4 h5 5. Bg5 Qb6 6. Bd3 Bxd3 7. Qxd3 Qxb2
8. e6 Qxa1 *

[d]rn2kbnr/pp2ppp1/2p1P3/3p2Bp/3P3P/3Q4/P1P2PP1/qN2K1NR w Kkq - 0 9

you are great.

how did you think of posting this here?

[Vinvin]

This position still gives Stockfish a difficult time on my computer (20 core dual xeon with 16GB hash), also Houdini 5.01 tactical doesn't seem to do much better, neither one solves in 10 minutes.

[d]r2r1q1k/5p1p/4pP2/pppbB2Q/1b6/1P4P1/5PBP/R2R2K1 w - - 0 24

both engines seem to like 24.Bc7, but the best move is the exchange sacrifice 24.Rxd5! busting up black's position and wreaking havoc with threats to the black king with the white bishops and white queen.
...

Thanks for this position, I missed it 17 months ago.

I let SF-MF analyse on 2 variants :

1) after 24.Rxd5 exd5 25.Rd1, 5 best moves mode (a4 and Qg8 seems the best replies) :

Code: Select all

FEN: r2r1q1k/5p1p/5P2/ppppB2Q/1b6/1P4P1/5PBP/3R2K1 b - - 1 25

Stockfish_170818_matefinder:
...
 38/61	18:53	 12 216 693k	10 778k	+2,53	25. ... Re8 26.Bxd5 Rxe5 27.Qxe5 Rd8 28.Kg2 c4 29.bxc4 bxc4 30.Qh5 Rd6 31.Be4 Qg8 32.Rxd6 Bxd6 33.Qxa5 Bf4 34.Bd5 c3 35.Qxc3 Qd8 36.Bxf7 Bg5 37.Qc4 Bxf6 38.Qe4 Qf8 39.Bc4 Be7 40.Bd3 Qg7 41.Qf5 Bb4 42.Qd5 Bf8 43.Qd8 Qb7+ 44.Kf1 Qg7 45.Qa8 Qf7 46.Kg2 Qg8 47.Bc4 Qxc4
 38/74	18:53	 12 216 693k	10 778k	+2,31	25. ... d4 26.Be4 Qg8 27.g4 Re8 28.Rd3 c4 29.Rh3 Rxe5 30.Qxe5 Re8 31.Qf4 Rxe4 32.Qxe4 c3 33.Rh5 a4 34.Rxb5 c2 35.Qxc2 Qxg4+ 36.Kf1 Qh3+ 37.Ke2 Qg4+ 38.f3 Qg2+ 39.Kd3 Qg6+ 40.Kxd4 Qxf6+ 41.Ke3 Qh6+ 42.f4 Qe6+ 43.Re5 Qh3+ 44.Kd4 Bf8 45.Qf5 Qxf5 46.Rxf5 axb3 47.Rb5 b2 48.Rb8 Kg7 49.Rxb2 Kg6 50.Rb5 Bg7+ 51.Ke4 h5 52.Rb6+ f6 53.h4 Bh6 54.f5+ Kg7 55.Rb7+ Kf8 56.Rb6
 39/64	18:53	 12 216 693k	10 778k	+2,08	25. ... Qe8 26.Rxd5 Qg8 27.Bd6 Qg6 28.Qe2 Bc3 29.Be4 Qg8 30.Qe3 Bxf6 31.Qf4 Bg7 32.Rh5 Rxd6 33.Qxd6 Qf8 34.Qd7 Ra6 35.Qxb5 Re6 36.Rxh7+ Kg8 37.Rh4 Qd6 38.Qxa5 Kf8 39.Kg2 Bf6 40.Rf4 Be5 41.Rf5 Bd4 42.Bf3 Kg7 43.Rd5 Qe7 44.b4 Rd6 45.Rxc5 Qe1 46.Rg5+ Kh6 47.Rh5+ Kg7 48.Qa8 Qxf2+ 49.Kh3 Rh6 50.Rxh6 Kxh6 51.Qd5 Bf6 52.Qh5+ Kg7
 39/65	18:53	 12 216 693k	10 778k	+2,08	25. ... Qg8 26.Bxd5 Rxd5 27.Rxd5 Re8 28.Kg2 a4 29.bxa4 bxa4 30.Rd7 Qg6 31.Qf3 c4 32.Qd5 c3 33.Rc7 a3 34.Qc4 a2 35.Qxa2 h5 36.Qd5 c2 37.h4 Bf8 38.Bb2 Bh6 39.Qc6 Rb8 40.Qxc2 Qxc2 41.Rxc2 Kh7 42.Be5 Ra8 43.f4 Kg6 44.Rc5 Bf8 45.Rd5 Ra2+ 46.Kf3 Bb4 47.Bd4 Ra3+ 48.Ke4 Bc3 49.f5+ Kh7 50.Bxc3 Rxc3 51.Rd3 Rxd3
 39/58	18:53	 12 216 693k	10 778k	+1,39	25. ... a4 26.Bxd5 Qe8 27.Bxa8 Rxa8 28.bxa4 bxa4 29.Rd6 a3 30.Qg4 Qg8 31.Qc4 Re8 32.Qd5 c4 33.Rb6 Bd2 34.Qxd2 Rxe5 35.Ra6 Re8 36.Rxa3 Qg6 37.Qf4 h6 38.Qxc4 Qxf6 39.Ra6 Re6 40.Rxe6 fxe6 41.Kg2 Kg7 42.Qg4+ Kf7 43.Qf3 Qf5 44.g4 Qxf3+ 45.Kxf3 Kg6 46.h4 h5 47.g5 Kf7 48.Ke4 Kg6

2) after 24.Rxd5 exd5 25.Rd1 a4, 2 best moves mode :

Code: Select all

FEN: r2r1q1k/5p1p/5P2/1pppB2Q/pb6/1P4P1/5PBP/3R2K1 w - - 0 26

Stockfish_170818_matefinder:
...
 41/55	13:11	 9 168 738k	11 583k	+0,97	26.bxa4 bxa4 27.Bxd5 Qe8 28.Bxa8 Rxa8 29.Rd6 a3 30.Qg4 Qg8 31.Qc4 Re8 32.Qd5 c4 33.Rb6 Bd2 34.Qxd2 Rxe5 35.Ra6 Re8 36.Rxa3 Qg6 37.Qf4 Rc8 38.Qf3 h6 39.Kg2 Re8 40.h4 Re6 41.Qf4 Rxf6 42.Qxc4 Qf5 43.Qd4 Kh7 44.h5 Re6 45.Ra8 Qe4+ 46.Qxe4+ Rxe4 47.Ra3 Rb4 48.Kf3 Kg7 49.Ra7 Rb3+ 50.Kf4 Rb4+ 51.Kf5 Rb5+ 52.Kg4
 41/61	13:11	 9 168 738k	11 583k	+1,17	26.Bxd5 Qe8 27.Bxa8 Rxa8 28.bxa4 bxa4 29.Rd6 a3 30.Qg4 Qg8 31.Qc4 Re8 32.Qd5 c4 33.Rb6 Bd2 34.Qxd2 Rxe5 35.Ra6 Re8 36.Rxa3 Qg6 37.Qf4 Rc8 38.Qf3 h6 39.h4 Re8 40.h5 Qe4 41.Qxe4 Rxe4 42.Rc3 Re6 43.Rxc4 Rxf6 44.Rc5 Ra6 45.Kg2 Ra4 46.f3 Kg7 47.g4 Ra6 48.f4 Ra3 49.Kf2 Rb3 50.Rc7 Kf6 51.Rc6+ Kg7 52.g5 hxg5 53.fxg5 Rh3

[Nordlandia]

how did you think of posting this here?

Mistake

[Lyudmil Tsvetkov]

This position still gives Stockfish a difficult time on my computer (20 core dual xeon with 16GB hash), also Houdini 5.01 tactical doesn't seem to do much better, neither one solves in 10 minutes.

[d]r2r1q1k/5p1p/4pP2/pppbB2Q/1b6/1P4P1/5PBP/R2R2K1 w - - 0 24

both engines seem to like 24.Bc7, but the best move is the exchange sacrifice 24.Rxd5! busting up black's position and wreaking havoc with threats to the black king with the white bishops and white queen.
...

Thanks for this position, I missed it 17 months ago.

I let SF-MF analyse on 2 variants :

1) after 24.Rxd5 exd5 25.Rd1, 5 best moves mode (a4 and Qg8 seems the best replies) :

Code: Select all

FEN: r2r1q1k/5p1p/5P2/ppppB2Q/1b6/1P4P1/5PBP/3R2K1 b - - 1 25

Stockfish_170818_matefinder:
...
 38/61	18:53	 12 216 693k	10 778k	+2,53	25. ... Re8 26.Bxd5 Rxe5 27.Qxe5 Rd8 28.Kg2 c4 29.bxc4 bxc4 30.Qh5 Rd6 31.Be4 Qg8 32.Rxd6 Bxd6 33.Qxa5 Bf4 34.Bd5 c3 35.Qxc3 Qd8 36.Bxf7 Bg5 37.Qc4 Bxf6 38.Qe4 Qf8 39.Bc4 Be7 40.Bd3 Qg7 41.Qf5 Bb4 42.Qd5 Bf8 43.Qd8 Qb7+ 44.Kf1 Qg7 45.Qa8 Qf7 46.Kg2 Qg8 47.Bc4 Qxc4
 38/74	18:53	 12 216 693k	10 778k	+2,31	25. ... d4 26.Be4 Qg8 27.g4 Re8 28.Rd3 c4 29.Rh3 Rxe5 30.Qxe5 Re8 31.Qf4 Rxe4 32.Qxe4 c3 33.Rh5 a4 34.Rxb5 c2 35.Qxc2 Qxg4+ 36.Kf1 Qh3+ 37.Ke2 Qg4+ 38.f3 Qg2+ 39.Kd3 Qg6+ 40.Kxd4 Qxf6+ 41.Ke3 Qh6+ 42.f4 Qe6+ 43.Re5 Qh3+ 44.Kd4 Bf8 45.Qf5 Qxf5 46.Rxf5 axb3 47.Rb5 b2 48.Rb8 Kg7 49.Rxb2 Kg6 50.Rb5 Bg7+ 51.Ke4 h5 52.Rb6+ f6 53.h4 Bh6 54.f5+ Kg7 55.Rb7+ Kf8 56.Rb6
 39/64	18:53	 12 216 693k	10 778k	+2,08	25. ... Qe8 26.Rxd5 Qg8 27.Bd6 Qg6 28.Qe2 Bc3 29.Be4 Qg8 30.Qe3 Bxf6 31.Qf4 Bg7 32.Rh5 Rxd6 33.Qxd6 Qf8 34.Qd7 Ra6 35.Qxb5 Re6 36.Rxh7+ Kg8 37.Rh4 Qd6 38.Qxa5 Kf8 39.Kg2 Bf6 40.Rf4 Be5 41.Rf5 Bd4 42.Bf3 Kg7 43.Rd5 Qe7 44.b4 Rd6 45.Rxc5 Qe1 46.Rg5+ Kh6 47.Rh5+ Kg7 48.Qa8 Qxf2+ 49.Kh3 Rh6 50.Rxh6 Kxh6 51.Qd5 Bf6 52.Qh5+ Kg7
 39/65	18:53	 12 216 693k	10 778k	+2,08	25. ... Qg8 26.Bxd5 Rxd5 27.Rxd5 Re8 28.Kg2 a4 29.bxa4 bxa4 30.Rd7 Qg6 31.Qf3 c4 32.Qd5 c3 33.Rc7 a3 34.Qc4 a2 35.Qxa2 h5 36.Qd5 c2 37.h4 Bf8 38.Bb2 Bh6 39.Qc6 Rb8 40.Qxc2 Qxc2 41.Rxc2 Kh7 42.Be5 Ra8 43.f4 Kg6 44.Rc5 Bf8 45.Rd5 Ra2+ 46.Kf3 Bb4 47.Bd4 Ra3+ 48.Ke4 Bc3 49.f5+ Kh7 50.Bxc3 Rxc3 51.Rd3 Rxd3
 39/58	18:53	 12 216 693k	10 778k	+1,39	25. ... a4 26.Bxd5 Qe8 27.Bxa8 Rxa8 28.bxa4 bxa4 29.Rd6 a3 30.Qg4 Qg8 31.Qc4 Re8 32.Qd5 c4 33.Rb6 Bd2 34.Qxd2 Rxe5 35.Ra6 Re8 36.Rxa3 Qg6 37.Qf4 h6 38.Qxc4 Qxf6 39.Ra6 Re6 40.Rxe6 fxe6 41.Kg2 Kg7 42.Qg4+ Kf7 43.Qf3 Qf5 44.g4 Qxf3+ 45.Kxf3 Kg6 46.h4 h5 47.g5 Kf7 48.Ke4 Kg6

2) after 24.Rxd5 exd5 25.Rd1 a4, 2 best moves mode :

Code: Select all

FEN: r2r1q1k/5p1p/5P2/1pppB2Q/pb6/1P4P1/5PBP/3R2K1 w - - 0 26

Stockfish_170818_matefinder:
...
 41/55	13:11	 9 168 738k	11 583k	+0,97	26.bxa4 bxa4 27.Bxd5 Qe8 28.Bxa8 Rxa8 29.Rd6 a3 30.Qg4 Qg8 31.Qc4 Re8 32.Qd5 c4 33.Rb6 Bd2 34.Qxd2 Rxe5 35.Ra6 Re8 36.Rxa3 Qg6 37.Qf4 Rc8 38.Qf3 h6 39.Kg2 Re8 40.h4 Re6 41.Qf4 Rxf6 42.Qxc4 Qf5 43.Qd4 Kh7 44.h5 Re6 45.Ra8 Qe4+ 46.Qxe4+ Rxe4 47.Ra3 Rb4 48.Kf3 Kg7 49.Ra7 Rb3+ 50.Kf4 Rb4+ 51.Kf5 Rb5+ 52.Kg4
 41/61	13:11	 9 168 738k	11 583k	+1,17	26.Bxd5 Qe8 27.Bxa8 Rxa8 28.bxa4 bxa4 29.Rd6 a3 30.Qg4 Qg8 31.Qc4 Re8 32.Qd5 c4 33.Rb6 Bd2 34.Qxd2 Rxe5 35.Ra6 Re8 36.Rxa3 Qg6 37.Qf4 Rc8 38.Qf3 h6 39.h4 Re8 40.h5 Qe4 41.Qxe4 Rxe4 42.Rc3 Re6 43.Rxc4 Rxf6 44.Rc5 Ra6 45.Kg2 Ra4 46.f3 Kg7 47.g4 Ra6 48.f4 Ra3 49.Kf2 Rb3 50.Rc7 Kf6 51.Rc6+ Kg7 52.g5 hxg5 53.fxg5 Rh3

a4 is a good find.

I did not see it, not my SF was so kind to point to it.

after a forced line a4 ba4 ba4 Bd5 Qe8 Ba8 Ra8:

[d]r3q2k/5p1p/5P2/2p1B2Q/pb6/6P1/5P1P/3R2K1 w - - 0 6

we get here, which is most certainly a draw

so, probably, unless Andrew finds some improvement for white, the position is a draw, unless Bf4 is stronger and wins, which I don't very much believe.

probably, big white advantage, but still a draw, black just holding.

in the actual game, featuring 2400 elo players(was it correspondence?), black lost in some 6 moves or so...

seemingly, our forum is much better than those correspondence players.

[yanquis1972]

it may be a draw, but if i'm reading that output right Bxd5 is preferred

[MikeB]

ok, it sees high scores after white's g4, followed by Rd3 to swing to h3, have to feed it manually to SF, seems to be too deep for it, but is it won?

in one of the lines I get here:

[d]8/3R1pkp/5b2/5K2/5P2/8/7P/8 w - - 0 29

anyone with 8-men?

the position is clearly won with latest dev-SF-McB apparently with Rd6, Rd1 an Rd2, Rd6 being shorter to a tablebase mate ( may not be a shorter mate).

Note - it's long drawn out affair with deep zugswang and it just misses a draw by the 50 move rule. I used the position cited - so based on moves prior to the position given, it could be a draw.
[d]8/3R1pkp/5b2/5K2/5P2/8/7P/8 w - - 0 29

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 50	+132.62 	6.76G	3:09.02	Rd6 Bh4 Rd2 Be7 Rg2+ Kf8 Ke5 Bh4 Rg1 Bd8 Rd1 Bh4 f5 Ke7 Rd6 f6+ Kd5 Bf2 Rc6 Kf7 Rc7+ Kg8 Ke6 Bd4 Rf7 Ba1 Rxf6 Bd4 Rf7 Bb6 f6 h6 Rg7+ Kh8 Kf5 Be3 Kg6 Bf4 f7 Bxh2 
 49	+132.61 	2.43G	1:11.06	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bb4 Kg5 Kg7 f5 f6+ Kf4+ Kf7 Ke4 Bd6 Kd5 Be5 Re2 Bc3 Ra2 Be5 Ra7+ Kg8 Ke6 Bd4 Rf7 Bb6 Rxf6 Kg7 Rf7+ Kg8 f6 h6 Rg7+ Kh8 Kf7 Be3 Kg6 Bf4 f7 Bxh2 
 48	+132.61 	1.26G	0:37.99	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bb4 Kg5 Kg7 f5 f6+ Kf4+ Kf7 Ke4 Bd6 Kd5 Be5 Ra2 Bb8 Rb2 Be5 Rb7+ Kg8 Ke6 Bc3 Rf7 Be1 Kxf6 Bc3+ Ke6 h6 Rb7 Bd4 f6 Bc5 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 47	+132.60 	906.6M	0:27.46	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Ra4 Kg7 Ke6 Be5 Ra7+ Kh6 Rf7 Bc3 Rxf6+ Kg5 Rf8 Kh5 f6 Bb4 Rh8 Kg6 f7 Kg7 Rg8+ Kh6 f8=Q+ Bxf8 
 46	+132.60 	769.0M	0:23.18	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Ra4 Kg7 Ke6 Be5 Ra7+ Kh6 Rf7 Bc3 Rxf6+ Kg5 Rf8 Kh5 f6 Bb4 Rh8 Kg6 f7 Kg7 Rg8+ Kh6 f8=Q+ Bxf8 
 45	+132.60 	739.0M	0:22.28	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Ra4 Kg7 Ke6 Be5 Ra7+ Kh6 Rf7 Bc3 Rxf6+ Kg5 Rf8 Kh5 f6 Bb4 Rh8 Kg6 f7 Kg7 Rg8+ Kh6 f8=Q+ Bxf8 
 44	+132.60 	662.5M	0:19.90	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Ra2 Kg7 Kd5 Kf7 Rb2 Be5 Rb7+ Kg8 Ke6 Bd4 Rf7 Be5 Rxf6 Bd4 Rf7 Bb6 Rb7 Bc5 f6 h6 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 43	+132.60 	639.2M	0:19.18	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Ra2 Kg7 Kd5 Kf7 Rb2 Be5 Rb7+ Kg8 Ke6 Bd4 Rf7 Be5 Rxf6 Bd4 Rf7 Bb6 Rb7 Bc5 f6 h6 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 42	+132.60 	611.4M	0:18.33	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Rb2 Be5 Rb7+ Kg8 Ke6 Bd4 Rf7 Be5 Rxf6 Bd4 Rf7 Bb6 Rb7 Bc5 f6 h6 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 41	+132.60 	593.0M	0:17.74	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Rb2 Be5 Rb7+ Kg8 Ke6 Bd4 Rf7 Be5 Rxf6 Bd4 Rf7 Bb6 Rb7 Bc5 f6 h6 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 40	+132.60 	589.6M	0:17.63	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Rb2 Be5 Rb7+ Kg8 Ke6 Bd4 Rf7 Be5 Rxf6 Bd4 Rf7 Bb6 Rb7 Bc5 f6 h6 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 39	+132.60 	589.3M	0:17.62	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Rb2 Be5 Rb7+ Kg8 Ke6 Bd4 Rf7 Be5 Rxf6 Bd4 Rf7 Bb6 Rb7 Bc5 f6 h6 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 38	+132.60 	589.2M	0:17.61	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Rb2 Be5 Rb7+ Kg8 Ke6 Bd4 Rf7 Be5 Rxf6 Bd4 Rf7 Bb6 Rb7 Bc5 f6 h6 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 37	+132.60 	589.1M	0:17.61	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Rb2 Be5 Rb7+ Kg8 Ke6 Bd4 Rf7 Be5 Rxf6 Bd4 Rf7 Bb6 Rb7 Bc5 f6 h6 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 36	+132.60 	589.0M	0:17.61	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Rb2 Be5 Rb7+ Kg8 Ke6 Bd4 Rf7 Be5 Rxf6 Bd4 Rf7 Bb6 Rb7 Bc5 f6 h6 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 36	+128.35!	345.0M	0:10.26	Rd1! 
 36	+102.76!	337.0M	0:10.03	Rd1! 
 36	+82.30!	327.2M	0:09.76	Rd1! 
 36	+65.94!	317.1M	0:09.47	Rd1! 
 36	+52.87!	305.0M	0:09.13	Rd1! 
 36	+42.44!	296.5M	0:08.89	Rd1! 
 36	+34.10!	287.4M	0:08.64	Rd1! 
 36	+27.45!	277.1M	0:08.36	Rd1! 
 36	+22.15!	266.6M	0:08.07	Rd1! 
 36	+17.92!	256.7M	0:07.78	Rd1! 
 36	+14.55!	240.8M	0:07.32	Rd1! 
 36	+11.87!	224.4M	0:06.82	Rd1! 
 36	+9.75!	205.2M	0:06.24	Rd1! 
 36	+8.06!	186.5M	0:05.68	Rd1! 
 36	+6.72!	158.8M	0:04.85	Rd1! 
 36	+5.67!	129.2M	0:03.96	Rd2! 
 36	+4.85!	111.1M	0:03.41	Rd2! 
 35	+2.39 	34.7M  	0:01.12	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Rc2 Bg7+ Kg5 Bd4 Rd2 Ba1 Kf5 Kg7 Rg2+ Kf8 Ra2 Bd4 Rd2 Bc3 Rd3 Ba1 Rd1 Bc3 Rc1 Bb2 Rc8+ Kg7 Rc2 Bd4 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kf6 Kh6 
 34	+2.39 	30.8M  	0:01.00	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Rc2 Bg7+ Kg5 Bd4 Rd2 Ba1 Rd1 Bc3 Rd3 Bb2 Rb3 Bd4 Kf5 Kg7 Rg3+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Rg2 Bd4 Re2 Bg7+ Kg5 Ba1 Rg2 Kg7 
 33	+2.39 	25.3M  	0:00.84	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Rc2 Bg7+ Kg5 Bd4 Rd2 Ba1 Rd1 Bc3 Rd3 Bb2 Rb3 Bd4 Kf5 Kg7 Rg3+ Kf8 Rd3 Ba1 Rh3 Kg7 Rg3+ Kf8 Kg4 Kg7 Kh5+ Kh8 Kh6 Bd4 Ra3 Bg7+ Kg5 Bd4 
 32	+2.39 	17.3M  	0:00.58	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Rc2 Bg7+ Kg5 Bd4 Rd2 Ba1 Rd1 Bc3 Rd3 Bb2 Rb3 Bd4 Kf5 Kg7 Rg3+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Re3 Bg7+ Kg5 Ba1 Kf5 Kg7 Rg3+ Kf8 
 31	+2.39 	15.0M  	0:00.51	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Rc2 Bg7+ Kg5 Bd4 Rd2 Ba1 Rd1 Bc3 Rd3 Bb2 Rb3 Bd4 Kf5 Kg7 Rg3+ Kf8 Kg4 Kg7 Kh5+ Kh8 Kh6 Bc5 Rd3 Bf8+ Kg5 Kg7 Kf5 Be7 
 30	+2.39 	12.9M  	0:00.44	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Ra2 Bg7+ Kg5 Bd4 Rd2 Ba1 Rd1 Bc3 Rd3 Bb2 Kh6 Bg7+ Kh5 Ba1 Rb3 Bd4 Kh6 Bg7+ Kg5 Bd4 Kf5 Kg7 Rg3+ Kf8 Kg4 
 29	+2.39 	11.3M  	0:00.39	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Ra2 Bg7+ Kg5 Bd4 Rd2 Ba1 Kf5 Kg7 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Rg3 Bb2 Kh6 Bd4 Ra3 Bg7+ Kg5 Bd4 Rd3 Bb2 
 28	+2.39 	9.30M  	0:00.32	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Ra2 Bg7+ Kg5 Bd4 Rd2 Ba1 Kf5 Kg7 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Rg3 Bb2 Kh6 Bd4 Rd3 Bg7+ Kg5 Bb2 
 27	+2.39 	8.99M  	0:00.31	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Ra2 Bg7+ Kg5 Bd4 Rd2 Ba1 Rg2 Kg7 Kf5+ Kf8 Kg4 Kg7 Kh5+ Kh8 Rg3 Bd4 Kh6 Bc5 Rg2 Bd4 Re2 
 26	+2.39 	7.97M  	0:00.27	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Ra2 Bg7+ Kg5 Bd4 Rd2 Ba1 Kf5 Kg7 Rd1 Bc3 Rg1+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bd2 Kg5 
 25	+2.39 	7.29M  	0:00.25	Rd2 Bc3 Rc2 Bd4 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Ra2 Bg7+ Kg5 Bd4 Rd2 Ba1 Kf5 Kg7 Rg2+ Kh8 Rg1 Bc3 Rc1 Bb2 Rc2 Bd4 Rg2 
 24	+2.39 	6.60M  	0:00.23	Rd2 Bc3 Rc2 Bd4 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Re2 Bg7+ Kg5 Ba1 Ra2 Bc3 Rc2 Bd4 Rd2 Ba1 Rd1 Bc3 Rd3 Bb2 Rb3 Ba1 
 23	+2.32 	3.94M  	0:00.14	Rd2 Be7 Re2 Bd8 Rb2 h6 Rb3 Ba5 Rd3 Be1 Rg3+ Kf8 Kf6 Bf2 Rh3 Bd4+ Kf5 Kg7 Rg3+ Kf8 Rg2 Bb6 Rc2 Kg7 h4 Bd8 h5 Bh4 Rh2 Be1 Rg2+ Kf8 
 22	+2.32 	3.64M  	0:00.13	Rd2 Be7 Re2 Bd8 Rb2 h6 Rb3 Ba5 Rd3 Be1 Rg3+ Kf8 Kf6 Bf2 Rh3 Bd4+ Kf5 Kg7 Rg3+ Kf8 Rg2 Bb6 Rc2 Kg7 h4 Bd8 h5 Bh4 
 21	+2.32 	3.41M  	0:00.12	Rd2 Be7 Re2 Bd8 Rb2 h6 Rb3 Ba5 Rd3 Be1 Rg3+ Kf8 Kf6 Bf2 Rh3 Bd4+ Kf5 Kg7 Rg3+ Kf8 Rg2 Bb6 Rc2 Kg7 
 20	+2.32 	2.76M  	0:00.10	Rd2 Be7 Re2 Bd8 Rb2 Be7 Rg2+ Kf8 Rg3 Bc5 Rd3 Bf2 Kg5 Kg7 h4 h6+ Kg4 Kf6 Rd6+ Kg7 Rd7 Be1 h5 Kf6 
 19	+2.05 	1.07M  	0:00.04	Rd2 Bh4 Rb2 Kf8 Rb7 Kg7 Rb3 Be1 Rh3 Bf2 Ke5 Be1 Rd3 Kf8 Kf5 Kg7 Rb3 Bh4 Rb7 
 18	+2.05 	516460	0:00.02	Rd2 Bc3 Rd3 Be1 Rd7 Bh4 Rd2 Kf8 Rg2 Be1 Rb2 Kg7 Rb3 Bh4 Rh3 Bf2 Ke5 Be1 
 17	+2.05 	456033	0:00.02	Rd2 Bc3 Rd3 Be1 Rh3 Bf2 Ke5 Be1 Ra3 Bh4 Kf5 Bf2 Rh3 Bd4 Rg3+ Kf8 Rd3 Bf2 
 16	+2.05 	418384	0:00.02	Rd2 Bc3 Rd3 Be1 Rh3 Bf2 Ke5 Be1 Ra3 Bf2 Ra2 Bh4 Rg2+ Kf8 Kf5 Be1 Rb2 Kg7 
 15	+2.05 	403225	0:00.02	Rd2 Bc3 Rd3 Be1 Rh3 Bf2 Ke5 Be1 Ra3 Bf2 Ra2 Bh4 Rg2+ Kf8 Rb2 Kg7 Kf5 Kf8 
 14	+2.05 	390622	0:00.02	Rd2 Bc3 Rd3 Be1 Rh3 Bf2 Ke5 Be1 Ra3 Bf2 Rd3 Bh4 Rb3 Bf2 
 13	+2.05 	287051	0:00.01	Rd2 Bh4 Rg2+ Kf8 Rb2 Kg7 Rb3 Be1 Ke5 Bf2 Rh3 Be1 Ra3 
 12	+2.05 	272619	0:00.01	Rd2 Bh4 Rg2+ Kf8 Rb2 Kg7 Rb3 Bf2 Ke5 Bh4 Rd3 Bf6+ Kf5 Bh4 Rh3 
 11	+2.13 	139840	0:00.01	Rd2 Be7 Rd7 Bb4 Rd3 Be1 Rb3 Bh4 Rh3 Be7 Rg3+ Kf8 
 10	+2.07 	126391	0:00.01	Rd2 Bh4 Rd3 Be7 Rb3 h5 Rb7 Bc5 Kg5 Bd6 
  9	+2.07 	67730  	0:00.00	Rd2 Bh4 Rg2+ Kf8 Re2 Kg7 Rd2 Be7 Rd3 Bh4 
  8	+2.07 	37373  	0:00.00	Rd1 Bh4 Rd2 Be7 Rd3 Bh4 Rd7 Bf6 
  7	+2.12 	15201  	0:00.00	Rd1 Be7 Rd3 Bh4 Rd7 Bf6 h3 
  6	+2.12 	10609  	0:00.00	Rd1 Be7 Rd3 h5 Rd5 Kf8 
  5	+2.10 	7761    	0:00.00	Rd2 Be7 Rd3 Bc5 Rc3 
  4	+2.31 	2634    	0:00.00	Rd2 Bc3 Rc2 Be1 
  3	+2.07 	1637    	0:00.00	Rb7 Bc3 h4 
  2	+6.52 	920      	0:00.00	Rd2 h5 
  1	+6.52 	374      	0:00.00	Rd1 
 

[pgn][Event "?"]
[Site "?"]
[Date "?"]
[Round "-"]
[White "?"]
[Black "?"]
[Result "*"]
[FEN "8/3R1pkp/5b2/5K2/5P2/8/7P/8 w - - 0 1"]
[SetUp "1"]


1. Rd6 Bh4 2. Rd1 Bf2 3. Ke5 Bh4 4. Rg1+ Kf8 5. Rg2 Bd8 6. Rd2 Bh4 7. f5
Ke7 8. Rd6 f6+ 9. Kd5 Bf2 10. Rc6 Kf7 11. Rc7+ Kg8 12. Ke6 Bd4 13. Rf7 Bb6
14. Rd7 Ba5 15. Kxf6 Bc3+ 16. Ke6 h6 17. f6 Bb4 18. f7+ Kf8 19. Rd8+ Kg7
20. f8=Q+ Bxf8 21. Rd7+ Kg8 22. Kf6 Bb4 23. Rd8+ Kh7 24. Rd7+ Kg8 25. h3
Bc3+ 26. Ke6 h5 27. Rb7 h4 28. Rc7 Ba1 29. Rb7 Bd4 30. Rb4 Ba1 31. Rb3 Bg7
32. Rb5 Ba1 33. Rc5 Bb2 34. Rc8+ Kh7 35. Rc7+ Kg6 36. Rc4 Bf6 37. Ra4 Bd8
38. Ra8 Bg5 39. Ra6 Bc1 40. Ra8 Bb2 41. Rd8 Ba1 42. Rf8 Bb2 43. Rc8 Ba1 44.
Rb8 Bc3 45. Rg8+ Kh5 46. Kf7 Ba1 47. Rf8 Bd4 48. Ke6 Bg7 49. Rc8 Kg5 50.
Rc7 Ba1 51. Rc4 Bb2 52. Rg4+ Kh5 53. Kf5 Bc1 54. Rb4 Be3 55. Rb8 Bc1 56.
Rb5 Bd2 57. Rd5 Bg5 58. Ke4 Kg6 59. Kf3 Be7 60. Kg4 Kf6 61. Rd2 Kg6 62. Re2
Bf6 63. Re4 Bg5 64. Re6+ Kf7 65. Kf5 Bf4 66. Re4 Bg3 67. Kg5 Kg7 68. Re7+
Kf8 69. Kf6 Bf2 70. Re4 Bb6 71. Ke6 Bd8 72. Rg4 Be7 73. Rf4+ Ke8 74. Ra4
Bg5 75. Ra8+ Bd8 76. Rc8 Kf8[/pgn]

[Lyudmil Tsvetkov]

it may be a draw, but if i'm reading that output right Bxd5 is preferred

my line starts after Rd5 ed5 Rd1, and now a4 for black instead of d4 or something else.

I thought it was self-explanatory.

[Lyudmil Tsvetkov]

ok, it sees high scores after white's g4, followed by Rd3 to swing to h3, have to feed it manually to SF, seems to be too deep for it, but is it won?

in one of the lines I get here:

[d]8/3R1pkp/5b2/5K2/5P2/8/7P/8 w - - 0 29

anyone with 8-men?

the position is clearly won with latest dev-SF-McB apparently with Rd6, Rd1 an Rd2, Rd6 being shorter to a tablebase mate ( may not be a shorter mate).

Note - it's long drawn out affair with deep zugswang and it just misses a draw by the 50 move rule. I used the position cited - so based on moves prior to the position given, it could be a draw.
[d]8/3R1pkp/5b2/5K2/5P2/8/7P/8 w - - 0 29

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 50	+132.62 	6.76G	3:09.02	Rd6 Bh4 Rd2 Be7 Rg2+ Kf8 Ke5 Bh4 Rg1 Bd8 Rd1 Bh4 f5 Ke7 Rd6 f6+ Kd5 Bf2 Rc6 Kf7 Rc7+ Kg8 Ke6 Bd4 Rf7 Ba1 Rxf6 Bd4 Rf7 Bb6 f6 h6 Rg7+ Kh8 Kf5 Be3 Kg6 Bf4 f7 Bxh2 
 49	+132.61 	2.43G	1:11.06	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bb4 Kg5 Kg7 f5 f6+ Kf4+ Kf7 Ke4 Bd6 Kd5 Be5 Re2 Bc3 Ra2 Be5 Ra7+ Kg8 Ke6 Bd4 Rf7 Bb6 Rxf6 Kg7 Rf7+ Kg8 f6 h6 Rg7+ Kh8 Kf7 Be3 Kg6 Bf4 f7 Bxh2 
 48	+132.61 	1.26G	0:37.99	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bb4 Kg5 Kg7 f5 f6+ Kf4+ Kf7 Ke4 Bd6 Kd5 Be5 Ra2 Bb8 Rb2 Be5 Rb7+ Kg8 Ke6 Bc3 Rf7 Be1 Kxf6 Bc3+ Ke6 h6 Rb7 Bd4 f6 Bc5 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 47	+132.60 	906.6M	0:27.46	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Ra4 Kg7 Ke6 Be5 Ra7+ Kh6 Rf7 Bc3 Rxf6+ Kg5 Rf8 Kh5 f6 Bb4 Rh8 Kg6 f7 Kg7 Rg8+ Kh6 f8=Q+ Bxf8 
 46	+132.60 	769.0M	0:23.18	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Ra4 Kg7 Ke6 Be5 Ra7+ Kh6 Rf7 Bc3 Rxf6+ Kg5 Rf8 Kh5 f6 Bb4 Rh8 Kg6 f7 Kg7 Rg8+ Kh6 f8=Q+ Bxf8 
 45	+132.60 	739.0M	0:22.28	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Ra4 Kg7 Ke6 Be5 Ra7+ Kh6 Rf7 Bc3 Rxf6+ Kg5 Rf8 Kh5 f6 Bb4 Rh8 Kg6 f7 Kg7 Rg8+ Kh6 f8=Q+ Bxf8 
 44	+132.60 	662.5M	0:19.90	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Ra2 Kg7 Kd5 Kf7 Rb2 Be5 Rb7+ Kg8 Ke6 Bd4 Rf7 Be5 Rxf6 Bd4 Rf7 Bb6 Rb7 Bc5 f6 h6 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 43	+132.60 	639.2M	0:19.18	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Ra2 Kg7 Kd5 Kf7 Rb2 Be5 Rb7+ Kg8 Ke6 Bd4 Rf7 Be5 Rxf6 Bd4 Rf7 Bb6 Rb7 Bc5 f6 h6 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 42	+132.60 	611.4M	0:18.33	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Rb2 Be5 Rb7+ Kg8 Ke6 Bd4 Rf7 Be5 Rxf6 Bd4 Rf7 Bb6 Rb7 Bc5 f6 h6 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 41	+132.60 	593.0M	0:17.74	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Rb2 Be5 Rb7+ Kg8 Ke6 Bd4 Rf7 Be5 Rxf6 Bd4 Rf7 Bb6 Rb7 Bc5 f6 h6 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 40	+132.60 	589.6M	0:17.63	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Rb2 Be5 Rb7+ Kg8 Ke6 Bd4 Rf7 Be5 Rxf6 Bd4 Rf7 Bb6 Rb7 Bc5 f6 h6 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 39	+132.60 	589.3M	0:17.62	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Rb2 Be5 Rb7+ Kg8 Ke6 Bd4 Rf7 Be5 Rxf6 Bd4 Rf7 Bb6 Rb7 Bc5 f6 h6 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 38	+132.60 	589.2M	0:17.61	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Rb2 Be5 Rb7+ Kg8 Ke6 Bd4 Rf7 Be5 Rxf6 Bd4 Rf7 Bb6 Rb7 Bc5 f6 h6 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 37	+132.60 	589.1M	0:17.61	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Rb2 Be5 Rb7+ Kg8 Ke6 Bd4 Rf7 Be5 Rxf6 Bd4 Rf7 Bb6 Rb7 Bc5 f6 h6 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 36	+132.60 	589.0M	0:17.61	Rd2 Ba1 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bc3 f5 Be5 Kg5 f6+ Kg4 Kg7 Kf3+ Kf7 Ke4 Bb8 Kd5 Be5 Ra2 Bb8 Rb2 Be5 Rb7+ Kg8 Ke6 Bd4 Rf7 Be5 Rxf6 Bd4 Rf7 Bb6 Rb7 Bc5 f6 h6 f7+ Kf8 Rb8+ Kg7 f8=Q+ Bxf8 
 36	+128.35!	345.0M	0:10.26	Rd1! 
 36	+102.76!	337.0M	0:10.03	Rd1! 
 36	+82.30!	327.2M	0:09.76	Rd1! 
 36	+65.94!	317.1M	0:09.47	Rd1! 
 36	+52.87!	305.0M	0:09.13	Rd1! 
 36	+42.44!	296.5M	0:08.89	Rd1! 
 36	+34.10!	287.4M	0:08.64	Rd1! 
 36	+27.45!	277.1M	0:08.36	Rd1! 
 36	+22.15!	266.6M	0:08.07	Rd1! 
 36	+17.92!	256.7M	0:07.78	Rd1! 
 36	+14.55!	240.8M	0:07.32	Rd1! 
 36	+11.87!	224.4M	0:06.82	Rd1! 
 36	+9.75!	205.2M	0:06.24	Rd1! 
 36	+8.06!	186.5M	0:05.68	Rd1! 
 36	+6.72!	158.8M	0:04.85	Rd1! 
 36	+5.67!	129.2M	0:03.96	Rd2! 
 36	+4.85!	111.1M	0:03.41	Rd2! 
 35	+2.39 	34.7M  	0:01.12	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Rc2 Bg7+ Kg5 Bd4 Rd2 Ba1 Kf5 Kg7 Rg2+ Kf8 Ra2 Bd4 Rd2 Bc3 Rd3 Ba1 Rd1 Bc3 Rc1 Bb2 Rc8+ Kg7 Rc2 Bd4 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kf6 Kh6 
 34	+2.39 	30.8M  	0:01.00	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Rc2 Bg7+ Kg5 Bd4 Rd2 Ba1 Rd1 Bc3 Rd3 Bb2 Rb3 Bd4 Kf5 Kg7 Rg3+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Rg2 Bd4 Re2 Bg7+ Kg5 Ba1 Rg2 Kg7 
 33	+2.39 	25.3M  	0:00.84	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Rc2 Bg7+ Kg5 Bd4 Rd2 Ba1 Rd1 Bc3 Rd3 Bb2 Rb3 Bd4 Kf5 Kg7 Rg3+ Kf8 Rd3 Ba1 Rh3 Kg7 Rg3+ Kf8 Kg4 Kg7 Kh5+ Kh8 Kh6 Bd4 Ra3 Bg7+ Kg5 Bd4 
 32	+2.39 	17.3M  	0:00.58	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Rc2 Bg7+ Kg5 Bd4 Rd2 Ba1 Rd1 Bc3 Rd3 Bb2 Rb3 Bd4 Kf5 Kg7 Rg3+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Re3 Bg7+ Kg5 Ba1 Kf5 Kg7 Rg3+ Kf8 
 31	+2.39 	15.0M  	0:00.51	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Rc2 Bg7+ Kg5 Bd4 Rd2 Ba1 Rd1 Bc3 Rd3 Bb2 Rb3 Bd4 Kf5 Kg7 Rg3+ Kf8 Kg4 Kg7 Kh5+ Kh8 Kh6 Bc5 Rd3 Bf8+ Kg5 Kg7 Kf5 Be7 
 30	+2.39 	12.9M  	0:00.44	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Ra2 Bg7+ Kg5 Bd4 Rd2 Ba1 Rd1 Bc3 Rd3 Bb2 Kh6 Bg7+ Kh5 Ba1 Rb3 Bd4 Kh6 Bg7+ Kg5 Bd4 Kf5 Kg7 Rg3+ Kf8 Kg4 
 29	+2.39 	11.3M  	0:00.39	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Ra2 Bg7+ Kg5 Bd4 Rd2 Ba1 Kf5 Kg7 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Rg3 Bb2 Kh6 Bd4 Ra3 Bg7+ Kg5 Bd4 Rd3 Bb2 
 28	+2.39 	9.30M  	0:00.32	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Ra2 Bg7+ Kg5 Bd4 Rd2 Ba1 Kf5 Kg7 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Rg3 Bb2 Kh6 Bd4 Rd3 Bg7+ Kg5 Bb2 
 27	+2.39 	8.99M  	0:00.31	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Ra2 Bg7+ Kg5 Bd4 Rd2 Ba1 Rg2 Kg7 Kf5+ Kf8 Kg4 Kg7 Kh5+ Kh8 Rg3 Bd4 Kh6 Bc5 Rg2 Bd4 Re2 
 26	+2.39 	7.97M  	0:00.27	Rd2 Bc3 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Ra2 Bg7+ Kg5 Bd4 Rd2 Ba1 Kf5 Kg7 Rd1 Bc3 Rg1+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bd2 Kg5 
 25	+2.39 	7.29M  	0:00.25	Rd2 Bc3 Rc2 Bd4 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Ra2 Bg7+ Kg5 Bd4 Rd2 Ba1 Kf5 Kg7 Rg2+ Kh8 Rg1 Bc3 Rc1 Bb2 Rc2 Bd4 Rg2 
 24	+2.39 	6.60M  	0:00.23	Rd2 Bc3 Rc2 Bd4 Rg2+ Kf8 Kg5 Kg7 Kh5+ Kh8 Kh6 Bf6 Re2 Bg7+ Kg5 Ba1 Ra2 Bc3 Rc2 Bd4 Rd2 Ba1 Rd1 Bc3 Rd3 Bb2 Rb3 Ba1 
 23	+2.32 	3.94M  	0:00.14	Rd2 Be7 Re2 Bd8 Rb2 h6 Rb3 Ba5 Rd3 Be1 Rg3+ Kf8 Kf6 Bf2 Rh3 Bd4+ Kf5 Kg7 Rg3+ Kf8 Rg2 Bb6 Rc2 Kg7 h4 Bd8 h5 Bh4 Rh2 Be1 Rg2+ Kf8 
 22	+2.32 	3.64M  	0:00.13	Rd2 Be7 Re2 Bd8 Rb2 h6 Rb3 Ba5 Rd3 Be1 Rg3+ Kf8 Kf6 Bf2 Rh3 Bd4+ Kf5 Kg7 Rg3+ Kf8 Rg2 Bb6 Rc2 Kg7 h4 Bd8 h5 Bh4 
 21	+2.32 	3.41M  	0:00.12	Rd2 Be7 Re2 Bd8 Rb2 h6 Rb3 Ba5 Rd3 Be1 Rg3+ Kf8 Kf6 Bf2 Rh3 Bd4+ Kf5 Kg7 Rg3+ Kf8 Rg2 Bb6 Rc2 Kg7 
 20	+2.32 	2.76M  	0:00.10	Rd2 Be7 Re2 Bd8 Rb2 Be7 Rg2+ Kf8 Rg3 Bc5 Rd3 Bf2 Kg5 Kg7 h4 h6+ Kg4 Kf6 Rd6+ Kg7 Rd7 Be1 h5 Kf6 
 19	+2.05 	1.07M  	0:00.04	Rd2 Bh4 Rb2 Kf8 Rb7 Kg7 Rb3 Be1 Rh3 Bf2 Ke5 Be1 Rd3 Kf8 Kf5 Kg7 Rb3 Bh4 Rb7 
 18	+2.05 	516460	0:00.02	Rd2 Bc3 Rd3 Be1 Rd7 Bh4 Rd2 Kf8 Rg2 Be1 Rb2 Kg7 Rb3 Bh4 Rh3 Bf2 Ke5 Be1 
 17	+2.05 	456033	0:00.02	Rd2 Bc3 Rd3 Be1 Rh3 Bf2 Ke5 Be1 Ra3 Bh4 Kf5 Bf2 Rh3 Bd4 Rg3+ Kf8 Rd3 Bf2 
 16	+2.05 	418384	0:00.02	Rd2 Bc3 Rd3 Be1 Rh3 Bf2 Ke5 Be1 Ra3 Bf2 Ra2 Bh4 Rg2+ Kf8 Kf5 Be1 Rb2 Kg7 
 15	+2.05 	403225	0:00.02	Rd2 Bc3 Rd3 Be1 Rh3 Bf2 Ke5 Be1 Ra3 Bf2 Ra2 Bh4 Rg2+ Kf8 Rb2 Kg7 Kf5 Kf8 
 14	+2.05 	390622	0:00.02	Rd2 Bc3 Rd3 Be1 Rh3 Bf2 Ke5 Be1 Ra3 Bf2 Rd3 Bh4 Rb3 Bf2 
 13	+2.05 	287051	0:00.01	Rd2 Bh4 Rg2+ Kf8 Rb2 Kg7 Rb3 Be1 Ke5 Bf2 Rh3 Be1 Ra3 
 12	+2.05 	272619	0:00.01	Rd2 Bh4 Rg2+ Kf8 Rb2 Kg7 Rb3 Bf2 Ke5 Bh4 Rd3 Bf6+ Kf5 Bh4 Rh3 
 11	+2.13 	139840	0:00.01	Rd2 Be7 Rd7 Bb4 Rd3 Be1 Rb3 Bh4 Rh3 Be7 Rg3+ Kf8 
 10	+2.07 	126391	0:00.01	Rd2 Bh4 Rd3 Be7 Rb3 h5 Rb7 Bc5 Kg5 Bd6 
  9	+2.07 	67730  	0:00.00	Rd2 Bh4 Rg2+ Kf8 Re2 Kg7 Rd2 Be7 Rd3 Bh4 
  8	+2.07 	37373  	0:00.00	Rd1 Bh4 Rd2 Be7 Rd3 Bh4 Rd7 Bf6 
  7	+2.12 	15201  	0:00.00	Rd1 Be7 Rd3 Bh4 Rd7 Bf6 h3 
  6	+2.12 	10609  	0:00.00	Rd1 Be7 Rd3 h5 Rd5 Kf8 
  5	+2.10 	7761    	0:00.00	Rd2 Be7 Rd3 Bc5 Rc3 
  4	+2.31 	2634    	0:00.00	Rd2 Bc3 Rc2 Be1 
  3	+2.07 	1637    	0:00.00	Rb7 Bc3 h4 
  2	+6.52 	920      	0:00.00	Rd2 h5 
  1	+6.52 	374      	0:00.00	Rd1 
 

[pgn][Event "?"]
[Site "?"]
[Date "?"]
[Round "-"]
[White "?"]
[Black "?"]
[Result "*"]
[FEN "8/3R1pkp/5b2/5K2/5P2/8/7P/8 w - - 0 1"]
[SetUp "1"]


1. Rd6 Bh4 2. Rd1 Bf2 3. Ke5 Bh4 4. Rg1+ Kf8 5. Rg2 Bd8 6. Rd2 Bh4 7. f5
Ke7 8. Rd6 f6+ 9. Kd5 Bf2 10. Rc6 Kf7 11. Rc7+ Kg8 12. Ke6 Bd4 13. Rf7 Bb6
14. Rd7 Ba5 15. Kxf6 Bc3+ 16. Ke6 h6 17. f6 Bb4 18. f7+ Kf8 19. Rd8+ Kg7
20. f8=Q+ Bxf8 21. Rd7+ Kg8 22. Kf6 Bb4 23. Rd8+ Kh7 24. Rd7+ Kg8 25. h3
Bc3+ 26. Ke6 h5 27. Rb7 h4 28. Rc7 Ba1 29. Rb7 Bd4 30. Rb4 Ba1 31. Rb3 Bg7
32. Rb5 Ba1 33. Rc5 Bb2 34. Rc8+ Kh7 35. Rc7+ Kg6 36. Rc4 Bf6 37. Ra4 Bd8
38. Ra8 Bg5 39. Ra6 Bc1 40. Ra8 Bb2 41. Rd8 Ba1 42. Rf8 Bb2 43. Rc8 Ba1 44.
Rb8 Bc3 45. Rg8+ Kh5 46. Kf7 Ba1 47. Rf8 Bd4 48. Ke6 Bg7 49. Rc8 Kg5 50.
Rc7 Ba1 51. Rc4 Bb2 52. Rg4+ Kh5 53. Kf5 Bc1 54. Rb4 Be3 55. Rb8 Bc1 56.
Rb5 Bd2 57. Rd5 Bg5 58. Ke4 Kg6 59. Kf3 Be7 60. Kg4 Kf6 61. Rd2 Kg6 62. Re2
Bf6 63. Re4 Bg5 64. Re6+ Kf7 65. Kf5 Bf4 66. Re4 Bg3 67. Kg5 Kg7 68. Re7+
Kf8 69. Kf6 Bf2 70. Re4 Bb6 71. Ke6 Bd8 72. Rg4 Be7 73. Rf4+ Ke8 74. Ra4
Bg5 75. Ra8+ Bd8 76. Rc8 Kf8[/pgn]

we already found an easier way to a draw, so that does not quite interest us right now.

[Eelco de Groot]

it may be a draw, but if i'm reading that output right Bxd5 is preferred

my line starts after Rd5 ed5 Rd1, and now a4 for black instead of d4 or something else.

I thought it was self-explanatory.

That is what Vincent was looking too if I'm not mistaken:

2) after 24.Rxd5 exd5 25.Rd1 a4, 2 best moves mode :

You said 26. bxa4 is forced, but John pointed out that 26. Bxd5 is Matefinder's alternative with a slightly higher score at that point (highest score sorted last, I think that is Arena). I have not analyzed any of the a4 lines.