Can it be Saved?

[Eelco de Groot]

It is a draw if White plays the correct strategy to exchange one of the rooks. This will get into an ending of R vs RB, which is a draw regardless of the extra pawn.

That was very interesting! But an uncertainty I think is Laurence; what happens if the pawn goes off the board without an exchange of Rooks? It is a 7 men endgame and I'm not sure if it is a draw? I tried to implement the fact that the passed pawn here is not really an asset because it has little chance of promoting and this should have increased the chances of a Rook exchange, but I think White just does not have the power to do that. Instead the result was that the pawn falls, which resets the 50 move counter but the engine does not take that into account here. Good thing is that the pawn is not really much worth and White's King position now seems a little bit better because the white Rooks are doing more interference work, instead of focusing on defending the pawn. This may just be enough for White to last 50 moves after the conversion, at least that was my tentative conclusion of the returned analysis. The equilibrium now seems to be around +1.45 for Black although he is a full Bishop ahead. The position after the Pawn is gone in one variation was analyzed further and the result is going down very slightly, so not conclusive that White can hold that. But I can't use any tablebases here, that's a handicap.

So with the new version build 126 with other Rook knowledge -> the analysis changes:

[D]2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - -

Engine: Rainbow Serpent 1.6.3s(dc) Build 126 (Athlon 2009 MHz, 128 MB)
by Tord Romstad, Marco Costalba, Joona Kiiski Modifications: Dann Corbit

1.00 0:00 -0.84 1.a6 (740) 6

2.00 0:00 -0.92 1.a6 Kc7 (828) 7

3.00 0:00 -0.96 1.a6 Kc7 2.Kb3 (1.616) 14

4.00 0:00 -1.01 1.a6 Kc7 2.Kb3 Ra4 (2.853) 25

5.00 0:00 -1.01 1.a6 Rb5+ 2.Ka3 Kc7 3.Re6 Ra5+ 4.Kb3 (7.198) 57

6.00 0:00 -1.05 1.a6 Rb5+ 2.Ka3 Kc7 3.Rhh7 Rd4 4.Rg6 Ra5+
5.Kb3 (13.307) 106

7.00 0:00 -1.01 1.a6 Rb5+ 2.Ka3 Kc7 3.a7 Ra5+ 4.Kb3 Rca4
5.Rhh7 Rd4 6.Kc3 (27.420) 174

8.00 0:00 -1.05 1.a6 Rb5+ 2.Ka3 Kc7 3.Rhh7 Rd4
4.Rxd7+ Rxd7 5.Rxd7+ Kxd7 6.Ka4 Rb6
7.Ka5 (47.669) 277

9.00 0:00 -1.09 1.a6 Rb5+ 2.Ka3 Re4 3.Rh8+ Kc7
4.Rhh7 Rd4 5.Rxd7+ Rxd7 6.Rxd7+ Kxd7
7.Ka4 Rb6 8.Ka5 Kc7 (127.605) 452

10.00 0:00 -1.29-- 1.a6 Rb5+ 2.Ka3 Re4 3.Rh8+ Kc7
4.Rhh7 Rd4 5.Rxd7+ Rxd7 6.Rxd7+ Kxd7
7.Ka4 Rb6 8.Ka5 Kc7 (582.062) 631

10.00 0:01 -1.17 1.Rh8+ Kc7 2.Rh3 Kc6 3.Rh6+ Be6
4.Re7 Kd6 5.Rexe6+ Rxe6 6.Rxe6+ Kxe6
7.Ka3 Rh4 8.Kb3 Kd6 9.Ka3 Kc7 10.Kb3 (1.019.178) 686

11.01 0:01 -1.17 1.Rh8+ Kc7 2.Rh3 Kc6 3.Rh6+ Be6
4.Re7 Kd6 5.Rexe6+ {An Exchange sacrifice to
limit the number of Rooks, the eval does seem
to have an effect here!} Rxe6 6.Rxe6+ Kxe6
7.Ka3 Rh4 8.Kb3 Kd6 9.Ka3 Kc7 10.Kb3 (1.379.785) 706

12.01 0:03 -1.21 1.Rh8+ Kc7 2.Kb3 Rc6 3.Rh4 Rd6
4.Rc4+ Kb7 5.Kc3 Re3+ 6.Kb2 Rd5
7.Kc1 Ka6 8.Rc7 Bf5 {No more piece
exchanges from here on} (2.731.456) 731

13.01 0:10 -1.13 1.Rh8+ Kc7 2.Kb3 Rc6 3.Rh4 Rd6 4.Kc3 Red5
5.Rgh7 Kb7 6.Rb4+ Ka7 7.Rb6 Rd3+
8.Kb2 Rd2+ 9.Kc3 R6d3+ 10.Kc4 Rd4+
11.Kc3 R2d3+ 12.Kc2 Rd5 (8.176.615) 759

14.01 0:12 -1.13 1.Rh8+ Kc7 2.Kb3 Rc6 3.Rh4 Rd6 4.Kc3 Red5
5.Rgh7 Kb7 6.Rb4+ Ka7 7.Rb6 Rd3+
8.Kb2 Rd2+ 9.Kc3 R6d3+ 10.Kc4 Rd4+
11.Kc3 R2d3+ 12.Kc2 Rd5 (9.235.488) 767

15.01 0:14 -1.13 1.Rh8+ Kc7 2.Kb3 Rc6 3.Rh4 Rd6 4.Kc3 Red5
5.Rgh7 Kb7 6.Rb4+ Ka7 7.Rb6 Rd3+
8.Kb2 Rd2+ 9.Kc3 R6d3+ 10.Kc4 Rd4+
11.Kc3 R2d3+ 12.Kc2 Rd5 (11.441.406) 777

16.01 0:23 -1.13 1.Rh8+ Kc7 2.Kb3 Rc6 3.Rh4 Rd6 4.Kc3 Re3+
5.Kc4 Re1 6.Kc3 Red1 7.Kb3 Kb7
8.Rb4+ Ka7 9.Rb6 R1d3+ 10.Kc2 Rd2+
11.Kc3 R6d5 12.Rc6 Rd1 13.Kc2 Kb7 (18.284.256) 786

17.01 0:45 -1.13 1.Rh8+ Kc7 2.Kb3 Rc6 3.Rh4 Rd6 4.Kc3 Re3+
5.Kc4 Re1 6.Kc3 Red1 7.Kb3 Kb7
8.Rb4+ Ka7 9.Rb6 R1d3+ 10.Kc2 Rd2+
11.Kc3 R6d5 12.Rb5 R5d3+ 13.Kc4 Rd4+
14.Kb3 (36.158.533) 786

18.01 1:37 -1.17 1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rc6 4.Rh3 Rd6
5.Rc3+ Kb7 6.Rb3+ Ka7 7.Kc2 Re2+
8.Kc3 Rd5 9.Rb2 Re3+ 10.Kc4 Ree5
11.Ra2 Rc5+ 12.Kd4 Red5+ 13.Ke3 Ka6
14.Rd2 (76.699.674) 787

19.01 2:28 -1.21 1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rc6 4.Rh3 Rd6
5.Rc3+ Kb7 6.Rb3+ Ka7 7.Kc2 Re2+
8.Kc3 Rd5 9.Rb2 Re3+ 10.Kc4 Ree5
11.Ra2 Rc5+ 12.Kd4 Red5+ 13.Ke3 Ka6
14.Rg6+ (117.236.853) 790

20.01 5:49 -1.33 1.Rh8+ Kc7 2.Kb3 Rd4 3.Kc3 Rd1 4.Ra8 Kc6
5.Ra7 Re3+ 6.Kc2 Rd5 7.Rg6+ Kb5
8.Kb2 Bf5 9.Rg2 Kb4 10.Rf2 Be4
11.Rh2 Rb3+ 12.Ka1 Re5 13.Re2 (270.251.609) 773

20.02 12:35 -1.25 1.Rg8+ Kc7 2.Ra6 Rb5+ 3.Ka3 Rc1
4.Ka2 Rc2+ 5.Ka3 Rc3+ 6.Ka2 Re3
7.Ra7+ Kd6 8.Rd8 Re7 9.Ka3 Rf7
10.Ka2 Kc6 11.Ra6+ Kc7 12.Rh8 Rf4
13.Ra7+ Kd6 14.Ra6+ (571.167.323) 756

21.01 16:16 -1.45-- 1.Rg8+ Kc7 2.Ra8 Kb7 3.Raa6 Rb4+
4.Kc2 (743.510.850) 761

22.01 52:42 -1.49 1.Rg8+ Kc7 2.Ra8 Be6 3.Ra7+ Kb8
4.Re7 Rb5+ 5.Ka3 Rxa5+ 6.Kb3 Rb5+
7.Ka3 Rc1 8.Rh8+ Bc8 9.Ka2 Rc6
10.Re3 Rd5 11.Kb2 Rd2+ 12.Ka3 Kc7
13.Re7+ Bd7 14.Rhh7 (2.396.729.352) 757

22.02 96:12 -1.45 1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+
4.Rb3 Rxa5 {[D]1k6/4R3/4b2R/r7/2r5/K7/8/8 w - -
see below, unclear if White can hold}
5.Rg6+ Kc7 6.Rgg3 Rh4 7.Rbc3+ Kb7
8.Rb3+ Ka7 9.Ra3 Ba4 10.Rg7+ Kb6
11.Rg6+ Kc7 12.Rc3+ Kd7 13.Rd3+
Ke7 14.Rg7+ (3.533.970.496) 612

23.01 131:01 -1.45 1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+
4.Rb3 Rxa5 5.Rg6+ Kc7 6.Rgg3 Rh4
7.Rbc3+ Kb7 8.Rb3+ Ka7 9.Ra3 Ba4
10.Rg7+ Kb6 11.Rg6+ Kc7 12.Rc3+ Kd7
13.Rd3+ Ke7 14.Rg7+ (4.326.165.039) 550

24.01 203:38 -1.45 1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+
4.Rb3 Rxa5 5.Rg6+ Kc7 6.Rgg3 Rh4
7.Rbc3+ Kb7 8.Rb3+ Ka7 9.Ra3 Ba4
10.Rg7+ Kb6 11.Rg6+ Kc7 12.Rc3+ Kd7
13.Rd3+ Ke7 14.Rg7+ (6.002.259.201) 491

best move: Rh6-h8 time: 329:31.531 min n/s: 428.385 nodes: 8.469.840.247


[FEN "2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - -"]

1. Rg8+ Kc7 2. Ra8 Be6 3. Ra7+ Kb8 4. Re7 Rb5+ 5. Ka3 Rxa5+
*

In the background at half CPU power. After the Pawn is taken off, the eval goes slowly downwards:

[D]1k6/4R3/4b2R/r7/2r5/K7/8/8 w - -

24.01 9:53 -1.49 6.Kb3 Rb5+ 7.Ka3 Rc1 8.Rh8+ Bc8
9.Ka2 Rc6 10.Re3 Rd5 11.Kb2 Rd2+
12.Ka3 Ka7 13.Rh7+ Ka6 14.Rhe7 Bf5
15.R3e5 Rd3+ 16.Kb4 Rd4+ 17.Kb3 Bc2+
18.Kb2 Rb4+ 19.Kc1 (261.377.454) 440

25.01 24:27 -1.53 6.Kb3 Rb5+ 7.Ka3 Rc1 8.Rh8+ Bc8
9.Ka2 Rc2+ 10.Ka3 Rc3+ 11.Ka2 Rb6
12.Reh7 Rc2+ 13.Ka3 Rc5 14.Rh4 Rc3+
15.Ka2 Kb7 16.R8h7+ Ka6 17.Ra4+ Kb5
18.Raa7 Rg3 19.Rhg7 (613.951.228) 418

26.01 34:54 -1.53 6.Kb3 Rb5+ 7.Ka3 Rc1 8.Rh8+ Bc8
9.Ka2 Rc2+ 10.Ka3 Rc3+ 11.Ka2 Rb6
12.Rf8 Rc2+ 13.Ka3 Rc5 14.Re4 Rc3+
15.Ka2 Kb7 16.Rf7+ Ka6 17.Rfe7 Bb7
18.Rd4 Rb5 19.Re6+ (886.265.368) 423

27.01 62:20 -1.53 6.Kb3 Rb5+ 7.Ka3 Rc1 8.Rh8+ Bc8
9.Ka2 Rc2+ 10.Ka3 Rc3+ 11.Ka2 Rb6
12.Rf8 Rc2+ 13.Ka3 Rc5 14.Re4 Rc3+
15.Ka2 Kb7 16.Rf7+ Ka6 17.Rfe7 Bb7
18.Rd4 Rb5 19.Re6+ (1.561.952.863) 417

28.01 161:22 -1.53 6.Kb3 Rb5+ 7.Ka3 Rc1 8.Rh8+ Bc8
9.Ka2 Rc2+ 10.Ka3 Rc3+ 11.Ka2 Rb6
12.Reh7 Rc2+ 13.Ka3 Rc5 14.Rh4 Rc3+
15.Ka2 Ka7 16.Ra4+ Kb7 17.Rh7+ Kb8
18.Rh8 Kc7 19.Rh7+ (3.899.332.041) 402

29.01 253:19 -1.57 6.Kb3 Rb5+ 7.Ka3 Rc1 8.Rh8+ Bc8
9.Ka2 Rc2+ 10.Ka3 Rc3+ 11.Ka2 Rb6
12.Reh7 Rc2+ 13.Ka3 Rc5 14.Rh4 Rc3+
15.Ka2 Ka7 16.Ra4+ Kb7 17.Rh7+ Kb8
18.Rh8 Kc7 19.Rh7+ (5.687.929.719) 374

best move: Ka3-b3 time: 282:47.562 min n/s: 388.450 nodes: 6.591.060.264

Eelco

[Eelco de Groot]

22.01 52:42 -1.49 1.Rg8+ Kc7 2.Ra8 Be6 3.Ra7+ Kb8
4.Re7 Rb5+ 5.Ka3 Rxa5+ 6.Kb3 Rb5+
7.Ka3 Rc1 8.Rh8+ Bc8 9.Ka2 Rc6
10.Re3 Rd5 11.Kb2 Rd2+ 12.Ka3 Kc7
13.Re7+ Bd7 14.Rhh7 (2.396.729.352) 757

22.02 96:12 -1.45 1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+
4.Rb3 Rxa5 {[D]1k6/4R3/4b2R/r7/2r5/K7/8/8 w - -
see below, unclear if White can hold}
5.Rg6+ Kc7 6.Rgg3 Rh4 7.Rbc3+ Kb7
8.Rb3+ Ka7 9.Ra3 Ba4 10.Rg7+ Kb6
11.Rg6+ Kc7 12.Rc3+ Kd7 13.Rd3+
Ke7 14.Rg7+ (3.533.970.496) 612

Sorry the diagram ended up in the wrong place, should move up to the first PV at iteration 22 after 1. Rg8+, not 1. Rh8+

22.01 52:42 -1.49 1.Rg8+ Kc7 2.Ra8 Be6 3.Ra7+ Kb8
4.Re7 Rb5+ 5.Ka3 Rxa5+
{[D]1k6/4R3/4b2R/r7/2r5/K7/8/8 w - -
see below, unclear if White can hold}
6.Kb3 Rb5+ 7.Ka3 Rc1 8.Rh8+ Bc8 9.Ka2 Rc6
10.Re3 Rd5 11.Kb2 Rd2+ 12.Ka3 Kc7
13.Re7+ Bd7 14.Rhh7 (2.396.729.352) 757

[kingliveson]

It's even more confusing now. At 5+2 and 15+3 time controls, white lost. At 30+2 time control, white pulled out a draw--did white play the perfect game or black blundered?! Extended the time control to 60+15 and white lost. Will play out 90+30 time control and possibly 120+? next. Here is how the 60+15 played out:
[d]2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - - 0 69

69. Kb3 Rc7 70. Rg8+ Kb7 71. Rb6+ Ka7 72. Rgg6 Rxa5 73. Kb2 Be8 74. Rh6
Rcc5 75. Rhf6 Bf7 76. Rbc6 Ra2+ 77. Kb1 Rb5+ 78. Kc1 Kb7 79. Rc2 Ra1+ 80.
Kd2 Bd5 81. Rd6 Rg1 82. Ke3 Re1+ 83. Re2 Rf1 84. Rc2 Rf3+ 85. Kd4 Rh3 86.
Rc3 Rh5 87. Rd7+ Kb6 88. Rd6+ Ka5 89. Ke3 Kb4 90. Rc7 Ka3 91. Rg7 Rb4 92.
Rg3 Ka4 93. Rd8 Ka5 94. Rc8 Ka6 95. Rc5 Ra4 96. Rg6+ Kb7 97. Rg3 Kb6 98.
Rc3 Rhh4 99. Kd3 Kb5 100. Ke3 Kb4 101. Rd3 Kc4 102. Rxd5 Kxd5 103. Rg5+ Kc4
104. Kf2 Ra2+ 105. Kg3 Rhh2 106. Kf4 Rhf2+ 107. Kg3 Rg2+ 108. Kf4 Rxg5 109.
Kxg5 Re2 110. Kf5 Kd4 111. Kf4 Re5 112. Kf3 Re4 113. Kf2 Re3 114. Kg2 Kd3
115. Kf2 Kd2 116. Kf1 Re2 117. Kg1 Ke1 118. Kh1 Kf2 119. Kh2 Re3 120. Kh1
Rh3# 0-1

[kingliveson]

At this point, it may be that the position is lost, but not conclusive unless tested with 7-piece EGTB. Here is the results with time control increased to 90m+30s increments with hash of 1024 MB using 4 cores with ponder off.

[d]2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - - 0 69

69. Kb3 {(1.Kb3 Rf4 2.Rh8+ Kc7 3.Rh3 Rd5 4.a6 Kb6 5.a7 Kxa7 6.Rhh7 Rfd4
7.Rg6 Rc5 8.Rhh6 Kb7 9.Rb6+ Kc8 10.Rbd6 Re4 11.Rb6 Ba4+ 12.Ka3) -0.21/21
160} Rc7 {(1. ... Rc7 2.Rg8+ Kb7 3.Rb6+ Ka7 4.Rgg6 Rxa5 5.Kb2 Rc4 6.Rb3
Rac5 7.Rd3 Bc6 8.Rgg3 Rc2+ 9.Kb3 Rh2 10.Rd6 Rh4 11.Kb2 Rb4+ 12.Rb3 Rbc4
13.Rbd3 Rc2+ 14.Kb3 Kb6 15.R3d5 R5c3+ 16.Kb4 Rc1 17.Re6 Rc4+ 18.Kb3 R1c3+
19.Kb2 Rf3 20.Rg6 Rh4 21.Rd2 Rb4+) +0.85/28 247} 70. Rg8+ {(1.Rg8+ Kb7
2.Rb6+ Ka7 3.Rgg6 Rxa5 4.Rgf6 Rc1 5.Kb2 Rac5 6.Rb4 R1c2+ 7.Ka3 Bc6 8.Rd6
Ka6 9.Rh6 Ra5+) -0.29/23 149} Kb7 {(1. ... Kb7 2.Rb6+ Ka7 3.Rgg6 Rxa5 4.Kb2
Be8 5.Rh6 Rcc5 6.Rhf6 Bf7 7.Rbc6 Ra2+ 8.Kb1 Rb5+ 9.Kc1 Bd5 10.Rc2 Ra1+
11.Kd2 Kb7 12.Rd6 Rg1 13.Ke3 Rg3+ 14.Kf4 Ra3 15.Rd2 Rf3+ 16.Kg4 Rb4+ 17.Kg5
Rg3+ 18.Kf5 Be4+ 19.Kf4 Rc3) +0.88/28 218} 71. Rb6+ {(1.Rb6+ Ka7 2.Rgg6
Rxa5 3.Rgf6 Rc1 4.Kb2 Rac5 5.Rb4 R1c2+ 6.Ka3 Bc6 7.Rd6 Rh2 8.Rb3 Ka6 9.Rg6
Rd2 10.Rb8 Ka5 11.Rg7 Rd3+ 12.Rb3) -0.30/23 96} Ka7 {(1. ... Ka7 2.Rgg6
Rxa5 3.Kb2 Be8 4.Rh6 Rcc5 5.Rhf6 Bf7 6.Rbc6 Ra2+ 7.Kb1 Rb5+ 8.Kc1 Bd5 9.Rc2
Ra1+ 10.Kd2 Kb7 11.Rd6 Rg1 12.Ke3 Rg3+ 13.Kf4 Ra3 14.Rd2 Rf3+ 15.Kg4 Rb4+
16.Kg5 Rg3+ 17.Kf5 Be4+ 18.Kf4 Rc3) +0.88/26 0} 72. Rgg6 {(1.Rgg6 Rxa5
2.Rgf6 Rc1 3.Kb2 Rac5 4.Rb4 R1c2+ 5.Ka3 Bc6 6.Rd6 Re5 7.Kb3 Rcc5 8.Rbd4 Ka6
9.Kb2 Kb5 10.Rd8 Rcd5 11.R8xd5+ Bxd5 12.Kc3 Kc5) -0.31/25 382} Rxa5 {(1.
... Rxa5 2.Kb2 Be8 3.Rh6 Rcc5 4.Rhd6 Ba4 5.Rb4 Rc2+ 6.Ka3 Bc6+ 7.Kb3 Rac5
8.Ka3 Rg2 9.Rb3 Re2 10.Rd8 Rec2 11.Rbd3 Ka6 12.R8d4 Ra5+ 13.Kb3 Rcc5 14.Rd6
Kb7 15.Kb4 Bd5 16.Rd2 Rab5+ 17.Ka4 Be4) +0.88/27 49} 73. Rgf6 {(1.Rgf6 Rc1
2.Kb2 Rac5 3.Rb4 R1c2+ 4.Ka3 Bc6 5.Rf7+ Ka6 6.Rff4 Rg2 7.Rbc4 Ra5+ 8.Kb4
Rb5+ 9.Kc3 Rg3+ 10.Kc2) -0.31/25 184} Rc1 {(1. ... Rc1 2.Kb2 Rac5 3.Rb4 Bc6
4.Rf2 Ka6 5.Rd2 Ka5 6.Rb3 Be4 7.Re2 Bd5 8.Rb8 Ka6 9.Rb4 R1c3 10.Rf2 Rg3
11.Ra4+ Kb6 12.Rb4+ Ka5 13.Rb8 Ka6 14.Rd2 Ra5 15.Kb1 Re3 16.Rb4 Rea3 17.Rb8
Ka7 18.Rb4 Rg3 19.Rh2 Re3 20.Rh7+ Ka6 21.Rh6+) +0.89/28 59} 74. Kb2 {(1.Kb2
Rac5 2.Rb4 R1c2+ 3.Ka3 Bc6 4.Rf7+ Ka6 5.Rg7 Rf5 6.Rg6 Rh5 7.Kb3 Rc1 8.Kb2)
-0.31/24 70} Rac5 {(1. ... Rac5 2.Rb4 Bc6 3.Rf2 Ka6 4.Rd2 Ka5 5.Rb3 Be4
6.Re2 R1c4 7.Rh2 Bd5 8.Ra3+ Kb5 9.Rb3+ Kc6 10.Rb8 Kc7 11.Rb3 Ra4 12.Rh7+
Kc6 13.Rh6+ Kd7 14.Rh7+ Ke6 15.Rh5 Ra2+ 16.Kb1 Rf2 17.Rb6+ Ke7 18.Rh7+ Bf7)
+0.94/27 72} 75. Rb4 {(1.Rb4 R5c2+ 2.Ka3 Bc6 3.Rf5 Ka6 4.Rf6) -0.32/23 222}
Bc6 {(1. ... Bc6 2.Rf2 Ka6 3.Rd2 Ka5 4.Rb3 Be4 5.Re2 R1c4 6.Ra3+ Kb5 7.Rb3+
Kc6 8.Rb8 Kc7 9.Rb3 Bd5 10.Rh2 Ra4 11.Rh7+ Kc6 12.Rh6+ Kd7 13.Rh7+ Ke6
14.Rh5 Ra2+ 15.Kb1 Rf2 16.Rb6+ Ke7 17.Rh7+ Bf7) +0.94/27 233} 76. Rf2
{(1.Rf2 Ka6 2.Rd4 Rh1 3.Rd6 Rb5+ 4.Kc3 Kb6 5.Rff6 Rc5+ 6.Kd2 Kb5 7.Rh6 Ra1
8.Ke3 Ra3+ 9.Kf4 Ra4+ 10.Ke3 Re5+ 11.Kd2 Be4) -0.33/22 159} Ka6 {(1. ...
Ka6 2.Rd2 Ka5 3.Rbd4 Re1 4.Ka3 Kb6 5.R2d3 Ree5 6.Rb4+ Kc7 7.Rh4 Ra5+ 8.Kb3
Bd5+ 9.Kb4 Be6 10.Rhd4 Reb5+ 11.Kc3 Bf5 12.Rd1 Ra3+ 13.Kc4 Rb6 14.Kd5 Ra5+
15.Kc4 Be6+ 16.Kd3 Rb3+) +0.99/26 99} 77. Rd4 {(1.Rd4 Rh1 2.Rd6 Rb5+ 3.Kc3
Kb6 4.Rff6 Rc5+ 5.Kd2 Kb5 6.Ke3 Rc3+ 7.Kf4 Rf1+ 8.Kg5 Rg1+ 9.Kf5 Rc5+
10.Kf4) -0.33/22 158} Rh1 {(1. ... Rh1 2.Rd6 Ka5 3.Rc2 Rb5+ 4.Kc3 Bd5 5.Rd2
Rh3+ 6.Kd4 Rh4+ 7.Kc3 Rc5+ 8.Kd3 Bc4+ 9.Ke3 Rb5 10.Kf2 Rb3 11.Kg2 Rg4+
12.Kf2 Rf4+ 13.Kg1 Rf5 14.Kg2 Rg5+ 15.Kf2 Rh3 16.Rd1 Kb5 17.Rd8) +1.02/26
172} 78. Rd6 {(1.Rd6 Kb7 2.Re6 Rh4 3.Re3 Bd5 4.Rc2 Ra5 5.Kc1 Ra1+ 6.Kd2
Raa4 7.Rec3 Ka6 8.Rc1 Rh2+ 9.Ke3 Re4+ 10.Kf3 Rh6 11.Kg3 Rb4) -0.38/22 376}
Ka5 {(1. ... Ka5 2.Rc2 Rb5+ 3.Kc3 Bd5 4.Rd2 Rh3+ 5.Kd4 Rh4+ 6.Kc3 Rc5+
7.Kd3 Bc4+ 8.Ke3 Rb5 9.Kf3 Rb3+ 10.Kg2 Rg4+ 11.Kf2 Rf4+ 12.Kg1 Rf5 13.Rd8
Rc3 14.Rc8 Rg5+ 15.Kf2 Ka4 16.Ra8+ Kb3 17.Rf8 Bd5 18.Rb8+ Ka3 19.Kf1 Rf5+)
+1.05/26 77} 79. Rc2 {(1.Rc2 Rb5+ 2.Kc3 Bd5 3.Rd2 Rh3+ 4.Kd4 Rh5 5.Ke3 Rb3+
6.Kf4 Rb4+ 7.Kg3 Rg5+ 8.Kh3 Bf3 9.Ra2+ Kb5 10.Rd8 Rg7 11.Rdd2 Bg4+ 12.Kh2
Be6 13.Rab2 Rxb2 14.Rxb2+ Kc5 15.Rg2) -0.36/21 63} Rb5+ {(1. ... Rb5+ 2.Kc3
Bd5 3.Rd2 Rh3+ 4.Kd4 Rh4+ 5.Kc3 Rc5+ 6.Kd3 Bc4+ 7.Ke3 Rb5 8.Kf3 Rb3+ 9.Kg2
Rg4+ 10.Kf2 Rf4+ 11.Kg1 Rf5 12.Rd8 Rc3 13.Rc8 Rg5+ 14.Kf2 Ka4 15.Ra8+ Kb3
16.Rf8 Bd5 17.Rb8+ Ka3 18.Kf1 Rf5+) +1.05/24 0} 80. Kc3 {(1.Kc3 Bd5 2.Rd2
Rh3+ 3.Kd4 Rh5 4.Ke3 Rb3+ 5.Kf4 Rb4+ 6.Kg3 Rg5+ 7.Kh3 Bf3 8.Ra2+ Kb5 9.Rdd2
Rh5+ 10.Kg3 Bc6 11.Rab2 Rg5+ 12.Kh2 Kc5 13.Rxb4 Rh5+ 14.Kg3) -0.35/23 88}
Bd5 {(1. ... Bd5 2.Rd2 Rh3+ 3.Kd4 Rh4+ 4.Kc3 Rc5+ 5.Kd3 Bc4+ 6.Ke3 Rb5
7.Kf3 Rb3+ 8.Kg2 Rh5 9.Rd8 Rc3 10.Kg1 Rg5+ 11.Rg2 Re5 12.Rgd2 Kb6 13.Rb8+
Kc6 14.Rbd8 Rg5+ 15.Rg2 Rf5 16.Re8 Rf6) +1.07/25 87} 81. Rd2 {(1.Rd2 Rh3+
2.Kd4 Rh5 3.Ke3 Rb3+ 4.Kf4 Rb4+ 5.Kg3 Rg5+ 6.Kh3 Bf3 7.Ra2+ Kb5 8.Rdd2 Bg4+
9.Kh4 Rh5+ 10.Kg3 Rh3+ 11.Kg2 Rbb3 12.Rdb2 Rhg3+ 13.Kf2 Rgf3+ 14.Ke1 Bf5)
-0.34/22 82} Rh3+ {(1. ... Rh3+ 2.Kd4 Rh4+ 3.Kc3 Rc5+ 4.Kd3 Bc4+ 5.Ke3 Rb5
6.Kf3 Rb3+ 7.Kg2 Rh5 8.Rd8 Rc3 9.Kg1 Rg5+ 10.Rg2 Re5 11.Rgd2 Kb6 12.Kf2
Rf5+ 13.Kg1 Rh5 14.Rb2+ Kc7 15.Rdd2 Rc1+ 16.Kg2) +1.07/25 74} 82. Kd4
{(1.Kd4 Rh5 2.Ke3 Rb3+ 3.Kf4 Rb4+ 4.Kg3 Rg5+ 5.Kh3 Bf7 6.R2d4 Rbb5 7.Rd3
Rbe5 8.Rg3 Be6+ 9.Kg2 Bd5+ 10.Kh3 Rh5+ 11.Kg4 Kb4 12.Rf6 Rh1 13.Rd3 Kc5
14.Rd2) -0.35/23 82} Rh5 {(1. ... Rh5 2.Ke3 Rb3+ 3.Kf4 Rb4+ 4.Kg3 Rg5+
5.Kh3 Bf7 6.R2d4 Rbb5 7.Rd3 Rbc5 8.Rd2 Rcf5 9.Kh2 Bd5 10.Kh3 Kb4 11.Kh4
Rh5+ 12.Kg3 Rfg5+ 13.Kf4 Re5 14.Kg3 Rhf5 15.Rc2 Kb5 16.Rb2+ Kc5 17.Rd8 Rg5+
18.Kh4 Kd4 19.Rc2) +1.08/27 198} 83. Ke3 {(1.Ke3 Rb3+ 2.Kf4 Rb4+ 3.Kg3 Rg5+
4.Kh3 Bf7 5.R2d4 Rbb5 6.Rd3 Rbe5 7.Rg3 Be6+ 8.Kg2 Bd5+ 9.Kh3 Rgf5 10.Rgg6
Rf4 11.Kg3 Rd4 12.Rg4 Rd1 13.Rf6) -0.35/23 140} Rb3+ {(1. ... Rb3+ 2.Kf4
Rb4+ 3.Kg3 Rg5+ 4.Kh3 Bf7 5.R2d4 Rbb5 6.Rd2 Rbf5 7.Kh2 Bd5 8.Kh3 Re5 9.Rd8
Kb4 10.Kh4 Be6 11.R8d4+ Kb5 12.Rd1 Rg7 13.R1d3 Rc5 14.Rd1 Rc3 15.R4d3 Rc8
16.Rd8 Rc4+ 17.R8d4 Rc2 18.R1d2 Rc3 19.R2d3 Rc2 20.Rd2) +1.17/27 70} 84.
Kf4 {(1.Kf4 Rb4+ 2.Kg3 Rg5+ 3.Kh3 Bf7 4.R6d4 Rb6 5.Rd6 Rb7 6.Kh4 Rg1 7.Kh3
Be6+ 8.Kh2 Rg5) -0.35/23 59} Rb4+ {(1. ... Rb4+ 2.Kg3 Rg5+ 3.Kh3 Bf7 4.R2d4
Rbb5 5.Rd3 Rb8 6.Rd8 Be6+ 7.Kh4 Rbb5 8.R3d4 Rbe5 9.Ra8+ Kb5 10.Raa4 Rh5+
11.Kg3 Re3+ 12.Kf2 Reh3 13.Rdb4+ Kc5 14.Rf4 Bd5 15.Ra5+ Kb6 16.Raa4 Kb5
17.Rab4+ Kc5 18.Rb8 Rh2+ 19.Kf1 Re5 20.Rc8+ Bc6) +1.21/27 75} 85. Kg3
{(1.Kg3 Rg5+ 2.Kh3 Bf7 3.R6d4 Be6+ 4.Kh4 Rbb5 5.Rd1 Rbe5 6.Rf4 Rh5+ 7.Kg3
Re3+ 8.Kf2 Rb3 9.Rf3 Rh2+ 10.Kg1 Rbb2 11.Rg3 Rhc2 12.Rg7 Re2 13.Ra7+ Kb5
14.Rg7 Kc5) -0.44/23 141} Rg5+ {(1. ... Rg5+ 2.Kh3 Bf3 3.Ra2+ Kb5 4.Rdd2
Rbg4 5.Rab2+ Ka5 6.Ra2+ Kb6 7.Rab2+ Kc7 8.Rbc2+ Bc6 9.Rc1 Rg3+ 10.Kh4 R5g4+
11.Kh5 Rg8 12.Kh4 R3g7 13.Rd5 Rg4+ 14.Kh3 Rg3+ 15.Kh4 Rg2 16.Kh3 R8g3+
17.Kh4 Rg4+ 18.Kh3 R2g3+ 19.Kh2 Rb3 20.Rc2 Rb1 21.Rc3 Kb6 22.Rg3 Rxg3
23.Kxg3 Bxd5 24.Kh3) +174.49/26 240} 86. Kh3 {(1.Kh3 Bf7 2.R6d4 Be6+ 3.Kh4
Rbb5 4.Rd1 Rbe5 5.Rf4 Rh5+ 6.Kg3 Re3+ 7.Kf2 Rb3 8.Rf3 Rh2+ 9.Kg1 Rbb2
10.Rg3 Rhc2 11.Rg7 Re2 12.Ra7+ Kb5 13.Rg7 Kc5) -0.44/23 1598} Bf3 {(1. ...
Bf3 2.Ra2+ Kb5 3.Rdd2 Rbg4 4.Rab2+ Ka5 5.Ra2+ Kb6 6.Rab2+ Kc7 7.Rbc2+ Bc6
8.Rc1 Rg3+ 9.Kh4 R5g4+ 10.Kh5 Rg8 11.Kh4 R3g7 12.Rd5 Rg4+ 13.Kh3 Rg3+
14.Kh4 Rg2 15.Kh3 R8g3+ 16.Kh4 Rg4+ 17.Kh3 R2g3+ 18.Kh2 Rb3 19.Rc2 Rb1
20.Rc3 Kb6 21.Rg3 Rxg3 22.Kxg3 Bxd5 23.Kh3) +174.49/25 0} 87. Ra2+ {(1.Ra2+
Kb5) -5.52/18 60} Kb5 {(1. ... Kb5 2.Rdd2 Rbg4 3.Rab2+ Ka5 4.Ra2+ Kb6
5.Rab2+ Kc7 6.Rbc2+ Bc6 7.Rd5 Rg8 8.Rc1 Rg3+ 9.Kh4 Rg2 10.Kh3 R8g3+ 11.Kh4
Rg4+ 12.Kh3 R2g3+ 13.Kh2 Rb3 14.Rc2 Rb1 15.Rc3 Kb6 16.Rg3 Rxg3 17.Kxg3 Bxd5
18.Kh3) +182.17/32 57} 88. Rdd2 {(1.Rdd2 Rbg4) -M33/20 1118} Rbg4 {(1. ...
Rbg4 2.Rab2+ Ka5 3.Ra2+ Kb6 4.Rab2+ Kc7 5.Rbc2+ Bc6 6.Rd5 Rg8 7.Rc1 Rg3+
8.Kh4 Rg2 9.Kh3 R8g3+ 10.Kh4 Rg4+ 11.Kh3 R2g3+ 12.Kh2 Rb3 13.Rc2 Rb1 14.Rc3
Kb6 15.Rg3 Rxg3 16.Kxg3 Bxd5 17.Kh3) +182.17/30 0} 89. Rab2+ {(1.Rab2+ Kc5)
-10.03/19 274} Ka5 {(1. ... Ka5 2.Ra2+ Kb6 3.Rab2+ Kc7 4.Rbc2+ Bc6 5.Rd5
Rg8 6.Rc1 Rg3+ 7.Kh4 Rg2 8.Kh3 R8g6 9.Rc3 Rg1 10.Kh2 Rb1 11.Rcc5 Kb6 12.Rg5
Rh6+ 13.Kg3 Rb3+ 14.Kg4 Bd7+ 15.Kf4 Rh4+ 16.Ke5 Kxc5 17.Kf6+ Bf5 18.Kg7 Kd4
19.Rxf5 Re3 20.Rf3) +185.05/33 58} 90. Ra2+ {(1.Ra2+ Kb6) -9.89/19 162} Kb6
{(1. ... Kb6 2.Rab2+ Kc7 3.Rbc2+ Bc6 4.Rd5 Rg8 5.Rc1 Rg3+ 6.Kh4 Rg2 7.Kh3
R8g6 8.Rc3 Rg1 9.Kh2 Rb1 10.Rcc5 Kb6 11.Rg5 Rh6+ 12.Kg3 Rb3+ 13.Kg4 Bd7+
14.Kf4 Rh4+ 15.Ke5 Kxc5 16.Kf6+ Bf5 17.Kg7 Kd4 18.Rxf5 Re3 19.Rf3)
+185.05/36 50} 91. Rab2+ {(1.Rab2+ Kc7) -10.03/19 205} Kc7 {(1. ... Kc7
2.Rbc2+ Bc6 3.Rd5 Rg8 4.Rc1 Rg3+ 5.Kh4 Rg2 6.Kh3 R8g7 7.Rc3 R2g6 8.Rh5 Rg1
9.Kh4 Kd6 10.Rd3+ Ke6 11.Re3+ Kf6 12.Rh8 R7g4+ 13.Kh3 Bd7 14.Rf3+ Kg7
15.Rh7+ Kxh7 16.Rf7+ Kh8 17.Rxd7) +188.25/38 250} 92. Rbc2+ {(1.Rbc2+ Bc6)
-10.03/19 96} Bc6 {(1. ... Bc6 2.Rd5 Rg8 3.Rc1 Rg3+ 4.Kh4 Rg2 5.Kh3 R8g7
6.Rc3 R2g6 7.Rh5 Rg1 8.Kh4 Kd6 9.Rd3+ Ke6 10.Re3+ Kf6 11.Rh8 R7g4+ 12.Kh3
Bd7 13.Rf3+ Kg7 14.Rh7+ Kxh7 15.Rf7+ Kh8 16.Rxd7) +188.25/37 0} 93. Rd5
{(1.Rd5 Rg3+) -M27/20 208} Rg8 {(1. ... Rg8 2.Rc1 Rg3+ 3.Kh4 Rg2 4.Kh3
R8g3+ 5.Kh4 Rg4+ 6.Kh3 Rg8 7.Rc3 R2g6 8.Kh4 Rg1 9.Rh5 Kd8 10.Ra3 Bd7
11.Ra8+ Bc8 12.Rd5+ Kc7 13.Rc5+ Kb7 14.Rc7+ Kxa8 15.Rxc8+) +190.81/36 116}
94. Rc1 {(1.Rc1 Rg2) -M22/18 50} Rg3+ {(1. ... Rg3+ 2.Kh4 Rg2 3.Kh3 R8g3+
4.Kh4 Rg4+ 5.Kh3 Rg8 6.Rc3 R2g6 7.Kh4 Rg1 8.Rh5 Kd8 9.Ra3 Bd7 10.Ra8+ Bc8
11.Rd5+ Kc7 12.Rc5+ Kb7 13.Rb8+ Kxb8 14.Rxc8+) +192.09/35 233} 95. Kh4
{(1.Kh4 Rg2) -M28/19 56} Rg2 {(1. ... Rg2 2.Kh3 R8g3+ 3.Kh4 Rg4+ 4.Kh3 Rg8
5.Rc3 R2g6 6.Kh4 Rg1 7.Rh5 Kd8 8.Ra3 Bd7 9.Ra8+ Bc8 10.Rd5+ Kc7 11.Rc5+ Kd6
12.Rd5+ Kxd5 13.Rxc8) +193.37/36 393} 96. Kh3 {(1.Kh3 R8g3+) -M27/17 4}
R8g3+ {(1. ... R8g3+ 2.Kh4 Rg6 3.Kh3 Rg8 4.Rc3 R2g6 5.Kh4 Rg1 6.Rh5 Kd8
7.Ra3 Bd7 8.Ra8+ Bc8 9.Rd5+ Kc7 10.Rc5+ Kd6 11.Rd5+ Kxd5 12.Rxc8)
+193.37/36 377} 97. Kh4 {(1.Kh4 Rg4+) -8.19/12 0} Rg6 {(1. ... Rg6 2.Kh3
Rg8 3.Rc3 R2g6 4.Kh4 Rg1 5.Rh5 Kd8 6.Ra3 Bd7 7.Ra8+ Bc8 8.Rd5+ Kc7 9.Rc5+
Kd6 10.Rd5+ Kxd5 11.Rxc8) +193.37/36 1191} 98. Kh3 {(1.Kh3 Rg7) -M27/20
270} Rg8 {(1. ... Rg8 2.Rc3 Kb7 3.Rb3+ Kc8 4.Rc3 R2g6 5.Kh4 Rg1 6.Ra5 Kd8
7.Rd3+ Kc7 8.Rc5 R8g7 9.Rb3 Kd6 10.Rf5 R7g4+ 11.Kh3 Rg8 12.Kh4 Kc7 13.Rf7+
Kc8 14.Rf5 Rh1+ 15.Rh3 Rh8+ 16.Rh5 Rxh5+ 17.Kxh5) +193.69/36 449} 99. Rh5
{(1.Rh5 R2g3+) -M26/14 1} R2g3+ {(1. ... R2g3+ 2.Kh2 Rb3 3.Rh7+ Kb6 4.Rh6
Rg2+ 5.Kh1 Rg6+ 6.Rxc6+ Rxc6) +201.69/34 81} 100. Kh2 {(1.Kh2 Rb3) -M25/12
0} Rb3 {(1. ... Rb3 2.Rh7+ Kb6 3.Rh6 Rg2+ 4.Kh1 Rg6+ 5.Rxc6+ Rxc6)
+201.69/33 1} 101. Rd5 {(1.Rd5 Kb6) -M24/10 0} Kb7 {(1. ... Kb7 2.Rcc5 Bxd5
3.Rxd5 Kc6 4.Rd4 Rh8+) +206.17/33 79} 102. Rd2 {(1.Rd2 Rh8+) -M17/8 0} Rh8+
{(1. ... Rh8+ 2.Kg1 Rh1+ 3.Kf2 Rxc1 4.Ke2 Rg1 5.Rd6 Rg2+ 6.Ke1 Rb1+ 7.Rd1
Rxd1+) +209.56/31 83} 103. Kg1 {(1.Kg1 Rh1+) -M16/8 0} Rh1+ {(1. ... Rh1+
2.Kf2 Rxc1 3.Ke2 Rg1 4.Rd6 Rg2+ 5.Ke1 Rb1+ 6.Rd1 Rxd1+) +209.56/30 2} 104.
Kf2 {(1.Kf2 Rxc1) -M15/8 0} Rxc1 {(1. ... Rxc1 2.Ke2 Rg1 3.Rd4 Rg2+ 4.Kf1
Rc2 5.Ke1 Rb1+ 6.Rd1 Rxd1+) +210.84/32 26} 105. Ke2 {(1.Ke2 Rh1) -M12/7 0}
Rh1 {(1. ... Rh1 2.Rd6 Rh2+ 3.Ke1 Rb1+ 4.Rd1 Rxd1+) +213.40/34 156} 106.
Rd4 {(1.Rd4 Rh2+) -M11/5 0} Rh2+ {(1. ... Rh2+ 2.Kf1 Rb1+ 3.Rd1 Rxd1+)
+214.68/35 126} 107. Ke1 {(1.Ke1) -M10/3 0} Rb1+ {(1. ... Rb1+ 2.Rd1 Rxd1+)
+215.96/34 74} 108. Rd1 {(1.Rd1) -M8/4 0} Rh1+ {(1. ... Rh1+ 2.Kd2 Rhxd1+
3.Kc3 Bb5) +215.96/37 97} 109. Kd2 {(1.Kd2) -M7/3 0} Rhxd1+ {(1. ... Rhxd1+
2.Kc2 Bb5 3.Kc3 Rb2) +216.60/38 112} 110. Ke2 {(1.Ke2) -M6/3 0} Rb2+ 111.
Kxd1 {(1.Kxd1) -M7/3 0} Ra2 112. Ke1 {(1.Ke1) -M6/3 0} Bf3 113. Kf1
{(1.Kf1) -M5/3 0} Kb6 114. Ke1 {(1.Ke1) -M4/3 0} Kc5 115. Kf1 {(1.Kf1)
-M3/3 0} Kd4 116. Ke1 {(1.Ke1) -M2/3 0} Ke3 117. Kf1 {(1.Kf1) -M1/3 0} Ra1#
0-1

[peter]

At this point, it may be that the position is lost, but not conclusive unless tested with 7-piece EGTB. Here is the results with time control increased to 90m+30s increments with hash of 1024 MB using 4 cores with ponder off.

[d] 2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - - 0 69

69. Kb3 {(1.Kb3 Rf4 2.Rh8+ Kc7 3.Rh3 Rd5 4.a6 Kb6 5.a7 Kxa7 6.Rhh7 Rfd4
7.Rg6 Rc5 8.Rhh6 Kb7 9.Rb6+ Kc8 10.Rbd6 Re4 11.Rb6 Ba4+ 12.Ka3) -0.21/21
160} Rc7 {(1. ... Rc7 2.Rg8+ Kb7 3.Rb6+ Ka7 4.Rgg6 Rxa5 5.Kb2 Rc4 6.Rb3
Rac5 7.Rd3 Bc6 8.Rgg3 Rc2+ 9.Kb3 Rh2 10.Rd6 Rh4 11.Kb2 Rb4+ 12.Rb3 Rbc4
13.Rbd3 Rc2+ 14.Kb3 Kb6 15.R3d5 R5c3+ 16.Kb4 Rc1 17.Re6 Rc4+ 18.Kb3 R1c3+
19.Kb2 Rf3 20.Rg6 Rh4 21.Rd2 Rb4+) +0.85/28 247} 70. Rg8+ {(1.Rg8+ Kb7
2.Rb6+ Ka7 3.Rgg6 Rxa5 4.Rgf6 Rc1 5.Kb2 Rac5 6.Rb4 R1c2+ 7.Ka3 Bc6 8.Rd6
Ka6 9.Rh6 Ra5+) -0.29/23 149} Kb7 {(1. ... Kb7 2.Rb6+ Ka7 3.Rgg6 Rxa5 4.Kb2
Be8 5.Rh6 Rcc5 6.Rhf6 Bf7 7.Rbc6 Ra2+ 8.Kb1 Rb5+ 9.Kc1 Bd5 10.Rc2 Ra1+
11.Kd2 Kb7 12.Rd6 Rg1 13.Ke3 Rg3+ 14.Kf4 Ra3 15.Rd2 Rf3+ 16.Kg4 Rb4+ 17.Kg5
Rg3+ 18.Kf5 Be4+ 19.Kf4 Rc3) +0.88/28 218} 71. Rb6+ {(1.Rb6+ Ka7 2.Rgg6
Rxa5 3.Rgf6 Rc1 4.Kb2 Rac5 5.Rb4 R1c2+ 6.Ka3 Bc6 7.Rd6 Rh2 8.Rb3 Ka6 9.Rg6
Rd2 10.Rb8 Ka5 11.Rg7 Rd3+ 12.Rb3) -0.30/23 96} Ka7 {(1. ... Ka7 2.Rgg6
Rxa5 3.Kb2 Be8 4.Rh6 Rcc5 5.Rhf6 Bf7 6.Rbc6 Ra2+ 7.Kb1 Rb5+ 8.Kc1 Bd5 9.Rc2
Ra1+ 10.Kd2 Kb7 11.Rd6 Rg1 12.Ke3 Rg3+ 13.Kf4 Ra3 14.Rd2 Rf3+ 15.Kg4 Rb4+
16.Kg5 Rg3+ 17.Kf5 Be4+ 18.Kf4 Rc3) +0.88/26 0} 72. Rgg6 {(1.Rgg6 Rxa5
2.Rgf6 Rc1 3.Kb2 Rac5 4.Rb4 R1c2+ 5.Ka3 Bc6 6.Rd6 Re5 7.Kb3 Rcc5 8.Rbd4 Ka6
9.Kb2 Kb5 10.Rd8 Rcd5 11.R8xd5+ Bxd5 12.Kc3 Kc5) -0.31/25 382} Rxa5 {(1.
... Rxa5 2.Kb2 Be8 3.Rh6 Rcc5 4.Rhd6 Ba4 5.Rb4 Rc2+ 6.Ka3 Bc6+ 7.Kb3 Rac5
8.Ka3 Rg2 9.Rb3 Re2 10.Rd8 Rec2 11.Rbd3 Ka6 12.R8d4 Ra5+ 13.Kb3 Rcc5 14.Rd6
Kb7 15.Kb4 Bd5 16.Rd2 Rab5+ 17.Ka4 Be4) +0.88/27 49} 73. Rgf6 {(1.Rgf6 Rc1
2.Kb2 Rac5 3.Rb4 R1c2+ 4.Ka3 Bc6 5.Rf7+ Ka6 6.Rff4 Rg2 7.Rbc4 Ra5+ 8.Kb4
Rb5+ 9.Kc3 Rg3+ 10.Kc2) -0.31/25 184} Rc1 {(1. ... Rc1 2.Kb2 Rac5 3.Rb4 Bc6
4.Rf2 Ka6 5.Rd2 Ka5 6.Rb3 Be4 7.Re2 Bd5 8.Rb8 Ka6 9.Rb4 R1c3 10.Rf2 Rg3
11.Ra4+ Kb6 12.Rb4+ Ka5 13.Rb8 Ka6 14.Rd2 Ra5 15.Kb1 Re3 16.Rb4 Rea3 17.Rb8
Ka7 18.Rb4 Rg3 19.Rh2 Re3 20.Rh7+ Ka6 21.Rh6+) +0.89/28 59} 74. Kb2 {(1.Kb2
Rac5 2.Rb4 R1c2+ 3.Ka3 Bc6 4.Rf7+ Ka6 5.Rg7 Rf5 6.Rg6 Rh5 7.Kb3 Rc1 8.Kb2)
-0.31/24 70} Rac5 {(1. ... Rac5 2.Rb4 Bc6 3.Rf2 Ka6 4.Rd2 Ka5 5.Rb3 Be4
6.Re2 R1c4 7.Rh2 Bd5 8.Ra3+ Kb5 9.Rb3+ Kc6 10.Rb8 Kc7 11.Rb3 Ra4 12.Rh7+
Kc6 13.Rh6+ Kd7 14.Rh7+ Ke6 15.Rh5 Ra2+ 16.Kb1 Rf2 17.Rb6+ Ke7 18.Rh7+ Bf7)
+0.94/27 72} 75. Rb4 {(1.Rb4 R5c2+ 2.Ka3 Bc6 3.Rf5 Ka6 4.Rf6) -0.32/23 222}
Bc6 {(1. ... Bc6 2.Rf2 Ka6 3.Rd2 Ka5 4.Rb3 Be4 5.Re2 R1c4 6.Ra3+ Kb5 7.Rb3+
Kc6 8.Rb8 Kc7 9.Rb3 Bd5 10.Rh2 Ra4 11.Rh7+ Kc6 12.Rh6+ Kd7 13.Rh7+ Ke6
14.Rh5 Ra2+ 15.Kb1 Rf2 16.Rb6+ Ke7 17.Rh7+ Bf7) +0.94/27 233} 76. Rf2
{(1.Rf2 Ka6 2.Rd4 Rh1 3.Rd6 Rb5+ 4.Kc3 Kb6 5.Rff6 Rc5+ 6.Kd2 Kb5 7.Rh6 Ra1
8.Ke3 Ra3+ 9.Kf4 Ra4+ 10.Ke3 Re5+ 11.Kd2 Be4) -0.33/22 159} Ka6 {(1. ...
Ka6 2.Rd2 Ka5 3.Rbd4 Re1 4.Ka3 Kb6 5.R2d3 Ree5 6.Rb4+ Kc7 7.Rh4 Ra5+ 8.Kb3
Bd5+ 9.Kb4 Be6 10.Rhd4 Reb5+ 11.Kc3 Bf5 12.Rd1 Ra3+ 13.Kc4 Rb6 14.Kd5 Ra5+
15.Kc4 Be6+ 16.Kd3 Rb3+) +0.99/26 99} 77. Rd4 {(1.Rd4 Rh1 2.Rd6 Rb5+ 3.Kc3
Kb6 4.Rff6 Rc5+ 5.Kd2 Kb5 6.Ke3 Rc3+ 7.Kf4 Rf1+ 8.Kg5 Rg1+ 9.Kf5 Rc5+
10.Kf4) -0.33/22 158} Rh1 {(1. ... Rh1 2.Rd6 Ka5 3.Rc2 Rb5+ 4.Kc3 Bd5 5.Rd2
Rh3+ 6.Kd4 Rh4+ 7.Kc3 Rc5+ 8.Kd3 Bc4+ 9.Ke3 Rb5 10.Kf2 Rb3 11.Kg2 Rg4+
12.Kf2 Rf4+ 13.Kg1 Rf5 14.Kg2 Rg5+ 15.Kf2 Rh3 16.Rd1 Kb5 17.Rd8) +1.02/26
172} 78. Rd6 {(1.Rd6 Kb7 2.Re6 Rh4 3.Re3 Bd5 4.Rc2 Ra5 5.Kc1 Ra1+ 6.Kd2
Raa4 7.Rec3 Ka6 8.Rc1 Rh2+ 9.Ke3 Re4+ 10.Kf3 Rh6 11.Kg3 Rb4) -0.38/22 376}
Ka5 {(1. ... Ka5 2.Rc2 Rb5+ 3.Kc3 Bd5 4.Rd2 Rh3+ 5.Kd4 Rh4+ 6.Kc3 Rc5+
7.Kd3 Bc4+ 8.Ke3 Rb5 9.Kf3 Rb3+ 10.Kg2 Rg4+ 11.Kf2 Rf4+ 12.Kg1 Rf5 13.Rd8
Rc3 14.Rc8 Rg5+ 15.Kf2 Ka4 16.Ra8+ Kb3 17.Rf8 Bd5 18.Rb8+ Ka3 19.Kf1 Rf5+)
+1.05/26 77} 79. Rc2 {(1.Rc2 Rb5+ 2.Kc3 Bd5 3.Rd2 Rh3+ 4.Kd4 Rh5 5.Ke3 Rb3+
6.Kf4 Rb4+ 7.Kg3 Rg5+ 8.Kh3 Bf3 9.Ra2+ Kb5 10.Rd8 Rg7 11.Rdd2 Bg4+ 12.Kh2
Be6 13.Rab2 Rxb2 14.Rxb2+ Kc5 15.Rg2) -0.36/21 63} Rb5+ {(1. ... Rb5+ 2.Kc3
Bd5 3.Rd2 Rh3+ 4.Kd4 Rh4+ 5.Kc3 Rc5+ 6.Kd3 Bc4+ 7.Ke3 Rb5 8.Kf3 Rb3+ 9.Kg2
Rg4+ 10.Kf2 Rf4+ 11.Kg1 Rf5 12.Rd8 Rc3 13.Rc8 Rg5+ 14.Kf2 Ka4 15.Ra8+ Kb3
16.Rf8 Bd5 17.Rb8+ Ka3 18.Kf1 Rf5+) +1.05/24 0} 80. Kc3 {(1.Kc3 Bd5 2.Rd2
Rh3+ 3.Kd4 Rh5 4.Ke3 Rb3+ 5.Kf4 Rb4+ 6.Kg3 Rg5+ 7.Kh3 Bf3 8.Ra2+ Kb5 9.Rdd2
Rh5+ 10.Kg3 Bc6 11.Rab2 Rg5+ 12.Kh2 Kc5 13.Rxb4 Rh5+ 14.Kg3) -0.35/23 88}
Bd5 {(1. ... Bd5 2.Rd2 Rh3+ 3.Kd4 Rh4+ 4.Kc3 Rc5+ 5.Kd3 Bc4+ 6.Ke3 Rb5
7.Kf3 Rb3+ 8.Kg2 Rh5 9.Rd8 Rc3 10.Kg1 Rg5+ 11.Rg2 Re5 12.Rgd2 Kb6 13.Rb8+
Kc6 14.Rbd8 Rg5+ 15.Rg2 Rf5 16.Re8 Rf6) +1.07/25 87} 81. Rd2 {(1.Rd2 Rh3+
2.Kd4 Rh5 3.Ke3 Rb3+ 4.Kf4 Rb4+ 5.Kg3 Rg5+ 6.Kh3 Bf3 7.Ra2+ Kb5 8.Rdd2 Bg4+
9.Kh4 Rh5+ 10.Kg3 Rh3+ 11.Kg2 Rbb3 12.Rdb2 Rhg3+ 13.Kf2 Rgf3+ 14.Ke1 Bf5)
-0.34/22 82} Rh3+ {(1. ... Rh3+ 2.Kd4 Rh4+ 3.Kc3 Rc5+ 4.Kd3 Bc4+ 5.Ke3 Rb5
6.Kf3 Rb3+ 7.Kg2 Rh5 8.Rd8 Rc3 9.Kg1 Rg5+ 10.Rg2 Re5 11.Rgd2 Kb6 12.Kf2
Rf5+ 13.Kg1 Rh5 14.Rb2+ Kc7 15.Rdd2 Rc1+ 16.Kg2) +1.07/25 74} 82. Kd4
{(1.Kd4 Rh5 2.Ke3 Rb3+ 3.Kf4 Rb4+ 4.Kg3 Rg5+ 5.Kh3 Bf7 6.R2d4 Rbb5 7.Rd3
Rbe5 8.Rg3 Be6+ 9.Kg2 Bd5+ 10.Kh3 Rh5+ 11.Kg4 Kb4 12.Rf6 Rh1 13.Rd3 Kc5
14.Rd2) -0.35/23 82} Rh5 {(1. ... Rh5 2.Ke3 Rb3+ 3.Kf4 Rb4+ 4.Kg3 Rg5+
5.Kh3 Bf7 6.R2d4 Rbb5 7.Rd3 Rbc5 8.Rd2 Rcf5 9.Kh2 Bd5 10.Kh3 Kb4 11.Kh4
Rh5+ 12.Kg3 Rfg5+ 13.Kf4 Re5 14.Kg3 Rhf5 15.Rc2 Kb5 16.Rb2+ Kc5 17.Rd8 Rg5+
18.Kh4 Kd4 19.Rc2) +1.08/27 198} 83. Ke3 {(1.Ke3 Rb3+ 2.Kf4 Rb4+ 3.Kg3 Rg5+
4.Kh3 Bf7 5.R2d4 Rbb5 6.Rd3 Rbe5 7.Rg3 Be6+ 8.Kg2 Bd5+ 9.Kh3 Rgf5 10.Rgg6
Rf4 11.Kg3 Rd4 12.Rg4 Rd1 13.Rf6) -0.35/23 140} Rb3+ {(1. ... Rb3+ 2.Kf4
Rb4+ 3.Kg3 Rg5+ 4.Kh3 Bf7 5.R2d4 Rbb5 6.Rd2 Rbf5 7.Kh2 Bd5 8.Kh3 Re5 9.Rd8
Kb4 10.Kh4 Be6 11.R8d4+ Kb5 12.Rd1 Rg7 13.R1d3 Rc5 14.Rd1 Rc3 15.R4d3 Rc8
16.Rd8 Rc4+ 17.R8d4 Rc2 18.R1d2 Rc3 19.R2d3 Rc2 20.Rd2) +1.17/27 70} 84.
Kf4 {(1.Kf4 Rb4+ 2.Kg3 Rg5+ 3.Kh3 Bf7 4.R6d4 Rb6 5.Rd6 Rb7 6.Kh4 Rg1 7.Kh3
Be6+ 8.Kh2 Rg5) -0.35/23 59} Rb4+ {(1. ... Rb4+ 2.Kg3 Rg5+ 3.Kh3 Bf7 4.R2d4
Rbb5 5.Rd3 Rb8 6.Rd8 Be6+ 7.Kh4 Rbb5 8.R3d4 Rbe5 9.Ra8+ Kb5 10.Raa4 Rh5+
11.Kg3 Re3+ 12.Kf2 Reh3 13.Rdb4+ Kc5 14.Rf4 Bd5 15.Ra5+ Kb6 16.Raa4 Kb5
17.Rab4+ Kc5 18.Rb8 Rh2+ 19.Kf1 Re5 20.Rc8+ Bc6) +1.21/27 75} 85. Kg3
{(1.Kg3 Rg5+ 2.Kh3 Bf7 3.R6d4 Be6+ 4.Kh4 Rbb5 5.Rd1 Rbe5 6.Rf4 Rh5+ 7.Kg3
Re3+ 8.Kf2 Rb3 9.Rf3 Rh2+ 10.Kg1 Rbb2 11.Rg3 Rhc2 12.Rg7 Re2 13.Ra7+ Kb5
14.Rg7 Kc5) -0.44/23 141} Rg5+ {(1. ... Rg5+ 2.Kh3 Bf3 3.Ra2+ Kb5 4.Rdd2
Rbg4 5.Rab2+ Ka5 6.Ra2+ Kb6 7.Rab2+ Kc7 8.Rbc2+ Bc6 9.Rc1 Rg3+ 10.Kh4 R5g4+
11.Kh5 Rg8 12.Kh4 R3g7 13.Rd5 Rg4+ 14.Kh3 Rg3+ 15.Kh4 Rg2 16.Kh3 R8g3+
17.Kh4 Rg4+ 18.Kh3 R2g3+ 19.Kh2 Rb3 20.Rc2 Rb1 21.Rc3 Kb6 22.Rg3 Rxg3
23.Kxg3 Bxd5 24.Kh3) +174.49/26 240} 86. Kh3 {(1.Kh3 Bf7 2.R6d4 Be6+ 3.Kh4
Rbb5 4.Rd1 Rbe5 5.Rf4 Rh5+ 6.Kg3 Re3+ 7.Kf2 Rb3 8.Rf3 Rh2+ 9.Kg1 Rbb2
10.Rg3 Rhc2 11.Rg7 Re2 12.Ra7+ Kb5 13.Rg7 Kc5) -0.44/23 1598} Bf3 {(1. ...
Bf3 2.Ra2+ Kb5 3.Rdd2 Rbg4 4.Rab2+ Ka5 5.Ra2+ Kb6 6.Rab2+ Kc7 7.Rbc2+ Bc6
8.Rc1 Rg3+ 9.Kh4 R5g4+ 10.Kh5 Rg8 11.Kh4 R3g7 12.Rd5 Rg4+ 13.Kh3 Rg3+
14.Kh4 Rg2 15.Kh3 R8g3+ 16.Kh4 Rg4+ 17.Kh3 R2g3+ 18.Kh2 Rb3 19.Rc2 Rb1
20.Rc3 Kb6 21.Rg3 Rxg3 22.Kxg3 Bxd5 23.Kh3) +174.49/25 0} 87. Ra2+ {(1.Ra2+
Kb5) -5.52/18 60} Kb5 {(1. ... Kb5 2.Rdd2 Rbg4 3.Rab2+ Ka5 4.Ra2+ Kb6
5.Rab2+ Kc7 6.Rbc2+ Bc6 7.Rd5 Rg8 8.Rc1 Rg3+ 9.Kh4 Rg2 10.Kh3 R8g3+ 11.Kh4
Rg4+ 12.Kh3 R2g3+ 13.Kh2 Rb3 14.Rc2 Rb1 15.Rc3 Kb6 16.Rg3 Rxg3 17.Kxg3 Bxd5
18.Kh3) +182.17/32 57} 88. Rdd2 {(1.Rdd2 Rbg4) -M33/20 1118} Rbg4 {(1. ...
Rbg4 2.Rab2+ Ka5 3.Ra2+ Kb6 4.Rab2+ Kc7 5.Rbc2+ Bc6 6.Rd5 Rg8 7.Rc1 Rg3+
8.Kh4 Rg2 9.Kh3 R8g3+ 10.Kh4 Rg4+ 11.Kh3 R2g3+ 12.Kh2 Rb3 13.Rc2 Rb1 14.Rc3
Kb6 15.Rg3 Rxg3 16.Kxg3 Bxd5 17.Kh3) +182.17/30 0} 89. Rab2+ {(1.Rab2+ Kc5)
-10.03/19 274} Ka5 {(1. ... Ka5 2.Ra2+ Kb6 3.Rab2+ Kc7 4.Rbc2+ Bc6 5.Rd5
Rg8 6.Rc1 Rg3+ 7.Kh4 Rg2 8.Kh3 R8g6 9.Rc3 Rg1 10.Kh2 Rb1 11.Rcc5 Kb6 12.Rg5
Rh6+ 13.Kg3 Rb3+ 14.Kg4 Bd7+ 15.Kf4 Rh4+ 16.Ke5 Kxc5 17.Kf6+ Bf5 18.Kg7 Kd4
19.Rxf5 Re3 20.Rf3) +185.05/33 58} 90. Ra2+ {(1.Ra2+ Kb6) -9.89/19 162} Kb6
{(1. ... Kb6 2.Rab2+ Kc7 3.Rbc2+ Bc6 4.Rd5 Rg8 5.Rc1 Rg3+ 6.Kh4 Rg2 7.Kh3
R8g6 8.Rc3 Rg1 9.Kh2 Rb1 10.Rcc5 Kb6 11.Rg5 Rh6+ 12.Kg3 Rb3+ 13.Kg4 Bd7+
14.Kf4 Rh4+ 15.Ke5 Kxc5 16.Kf6+ Bf5 17.Kg7 Kd4 18.Rxf5 Re3 19.Rf3)
+185.05/36 50} 91. Rab2+ {(1.Rab2+ Kc7) -10.03/19 205} Kc7 {(1. ... Kc7
2.Rbc2+ Bc6 3.Rd5 Rg8 4.Rc1 Rg3+ 5.Kh4 Rg2 6.Kh3 R8g7 7.Rc3 R2g6 8.Rh5 Rg1
9.Kh4 Kd6 10.Rd3+ Ke6 11.Re3+ Kf6 12.Rh8 R7g4+ 13.Kh3 Bd7 14.Rf3+ Kg7
15.Rh7+ Kxh7 16.Rf7+ Kh8 17.Rxd7) +188.25/38 250} 92. Rbc2+ {(1.Rbc2+ Bc6)
-10.03/19 96} Bc6 {(1. ... Bc6 2.Rd5 Rg8 3.Rc1 Rg3+ 4.Kh4 Rg2 5.Kh3 R8g7
6.Rc3 R2g6 7.Rh5 Rg1 8.Kh4 Kd6 9.Rd3+ Ke6 10.Re3+ Kf6 11.Rh8 R7g4+ 12.Kh3
Bd7 13.Rf3+ Kg7 14.Rh7+ Kxh7 15.Rf7+ Kh8 16.Rxd7) +188.25/37 0} 93. Rd5
{(1.Rd5 Rg3+) -M27/20 208} Rg8 {(1. ... Rg8 2.Rc1 Rg3+ 3.Kh4 Rg2 4.Kh3
R8g3+ 5.Kh4 Rg4+ 6.Kh3 Rg8 7.Rc3 R2g6 8.Kh4 Rg1 9.Rh5 Kd8 10.Ra3 Bd7
11.Ra8+ Bc8 12.Rd5+ Kc7 13.Rc5+ Kb7 14.Rc7+ Kxa8 15.Rxc8+) +190.81/36 116}
94. Rc1 {(1.Rc1 Rg2) -M22/18 50} Rg3+ {(1. ... Rg3+ 2.Kh4 Rg2 3.Kh3 R8g3+
4.Kh4 Rg4+ 5.Kh3 Rg8 6.Rc3 R2g6 7.Kh4 Rg1 8.Rh5 Kd8 9.Ra3 Bd7 10.Ra8+ Bc8
11.Rd5+ Kc7 12.Rc5+ Kb7 13.Rb8+ Kxb8 14.Rxc8+) +192.09/35 233} 95. Kh4
{(1.Kh4 Rg2) -M28/19 56} Rg2 {(1. ... Rg2 2.Kh3 R8g3+ 3.Kh4 Rg4+ 4.Kh3 Rg8
5.Rc3 R2g6 6.Kh4 Rg1 7.Rh5 Kd8 8.Ra3 Bd7 9.Ra8+ Bc8 10.Rd5+ Kc7 11.Rc5+ Kd6
12.Rd5+ Kxd5 13.Rxc8) +193.37/36 393} 96. Kh3 {(1.Kh3 R8g3+) -M27/17 4}
R8g3+ {(1. ... R8g3+ 2.Kh4 Rg6 3.Kh3 Rg8 4.Rc3 R2g6 5.Kh4 Rg1 6.Rh5 Kd8
7.Ra3 Bd7 8.Ra8+ Bc8 9.Rd5+ Kc7 10.Rc5+ Kd6 11.Rd5+ Kxd5 12.Rxc8)
+193.37/36 377} 97. Kh4 {(1.Kh4 Rg4+) -8.19/12 0} Rg6 {(1. ... Rg6 2.Kh3
Rg8 3.Rc3 R2g6 4.Kh4 Rg1 5.Rh5 Kd8 6.Ra3 Bd7 7.Ra8+ Bc8 8.Rd5+ Kc7 9.Rc5+
Kd6 10.Rd5+ Kxd5 11.Rxc8) +193.37/36 1191} 98. Kh3 {(1.Kh3 Rg7) -M27/20
270} Rg8 {(1. ... Rg8 2.Rc3 Kb7 3.Rb3+ Kc8 4.Rc3 R2g6 5.Kh4 Rg1 6.Ra5 Kd8
7.Rd3+ Kc7 8.Rc5 R8g7 9.Rb3 Kd6 10.Rf5 R7g4+ 11.Kh3 Rg8 12.Kh4 Kc7 13.Rf7+
Kc8 14.Rf5 Rh1+ 15.Rh3 Rh8+ 16.Rh5 Rxh5+ 17.Kxh5) +193.69/36 449} 99. Rh5
{(1.Rh5 R2g3+) -M26/14 1} R2g3+ {(1. ... R2g3+ 2.Kh2 Rb3 3.Rh7+ Kb6 4.Rh6
Rg2+ 5.Kh1 Rg6+ 6.Rxc6+ Rxc6) +201.69/34 81} 100. Kh2 {(1.Kh2 Rb3) -M25/12
0} Rb3 {(1. ... Rb3 2.Rh7+ Kb6 3.Rh6 Rg2+ 4.Kh1 Rg6+ 5.Rxc6+ Rxc6)
+201.69/33 1} 101. Rd5 {(1.Rd5 Kb6) -M24/10 0} Kb7 {(1. ... Kb7 2.Rcc5 Bxd5
3.Rxd5 Kc6 4.Rd4 Rh8+) +206.17/33 79} 102. Rd2 {(1.Rd2 Rh8+) -M17/8 0} Rh8+
{(1. ... Rh8+ 2.Kg1 Rh1+ 3.Kf2 Rxc1 4.Ke2 Rg1 5.Rd6 Rg2+ 6.Ke1 Rb1+ 7.Rd1
Rxd1+) +209.56/31 83} 103. Kg1 {(1.Kg1 Rh1+) -M16/8 0} Rh1+ {(1. ... Rh1+
2.Kf2 Rxc1 3.Ke2 Rg1 4.Rd6 Rg2+ 5.Ke1 Rb1+ 6.Rd1 Rxd1+) +209.56/30 2} 104.
Kf2 {(1.Kf2 Rxc1) -M15/8 0} Rxc1 {(1. ... Rxc1 2.Ke2 Rg1 3.Rd4 Rg2+ 4.Kf1
Rc2 5.Ke1 Rb1+ 6.Rd1 Rxd1+) +210.84/32 26} 105. Ke2 {(1.Ke2 Rh1) -M12/7 0}
Rh1 {(1. ... Rh1 2.Rd6 Rh2+ 3.Ke1 Rb1+ 4.Rd1 Rxd1+) +213.40/34 156} 106.
Rd4 {(1.Rd4 Rh2+) -M11/5 0} Rh2+ {(1. ... Rh2+ 2.Kf1 Rb1+ 3.Rd1 Rxd1+)
+214.68/35 126} 107. Ke1 {(1.Ke1) -M10/3 0} Rb1+ {(1. ... Rb1+ 2.Rd1 Rxd1+)
+215.96/34 74} 108. Rd1 {(1.Rd1) -M8/4 0} Rh1+ {(1. ... Rh1+ 2.Kd2 Rhxd1+
3.Kc3 Bb5) +215.96/37 97} 109. Kd2 {(1.Kd2) -M7/3 0} Rhxd1+ {(1. ... Rhxd1+
2.Kc2 Bb5 3.Kc3 Rb2) +216.60/38 112} 110. Ke2 {(1.Ke2) -M6/3 0} Rb2+ 111.
Kxd1 {(1.Kxd1) -M7/3 0} Ra2 112. Ke1 {(1.Ke1) -M6/3 0} Bf3 113. Kf1
{(1.Kf1) -M5/3 0} Kb6 114. Ke1 {(1.Ke1) -M4/3 0} Kc5 115. Kf1 {(1.Kf1)
-M3/3 0} Kd4 116. Ke1 {(1.Ke1) -M2/3 0} Ke3 117. Kf1 {(1.Kf1) -M1/3 0} Ra1#
0-1

Even if I'm not sure neither, to me it seems to be very drawish, if white manages to get his rooks in a line preventing his king from being castled.
To reach a position like the one on diagram, the pawn must be given away at the right moment, to be kept it isn't anyway. This is after the 6th white move of the main variant below.

[d]8/2kb2R1/6R1/P6r/8/4r3/K7/8 b - - 0 6

Here are three examples of matches. Firebird 1.1 with 5 MOB bitbases managed to win against Deep Fritz 12 with 5 MOB tablebases once, I guess by white error, I marked with ?!.
DF 12 with white drawed against FB and so did FB against R3. All the games were on Quad with 512 Mb hash each side and 40 moves in 90 minutes.

[Event "PCWINXP, 90'/40+60'/20+30'"]
[Site "Dort"]
[Date "2010.02.23"]
[Round "1"]
[White "DF12"]
[Black "FB1.1"]
[Result "1/2-1/2"]
[Annotator "-0.88;-1.42"]
[SetUp "1"]
[FEN "2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - - 0 1"]
[PlyCount "58"]

{Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz 2392 MHz W=23.8 plies; 3.
363kN/s; 1.852.767.858 TBAs B=19.4 plies; 8.724kN/s; 23.683.214 TBAs -0.32;
-0.98: 'Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz 2392 MHz W=22.1 plies;
96kN/s; 1.234.123 TBAs B=24.4 plies; 3.641kN/s; 747.569.035 TBAs '} 1. Rg8+ {
Beide letzter Buchzug} Kc7 2. Ra6 Rb5+ 3. Ka3 Rc3+ 4. Ka2 Re3 5. Rg7 {(Tgg6)} (
5. Rgg6 {(Tg7)} Rh5 6. Rg2 (6. Rh6 $6 Rd5 {(Tf5)} 7. Rh2 Be6 8. Ka1 Rb5 {(Tg5)}
9. Rh7+ Bd7 10. Ka2 Rf5 {(Tg5)} 11. Rh2 Be6+ 12. Kb2 Rb5+ 13. Kc1 Bf5 14. Rb6 (
14. Ra7+ Kb8 15. Ra6) 14... Rxa5 15. Rhb2 {(Tbb2)} Ra1+ {0-1 Deep Fritz
12-FireBird 1.1 w32/Dort 2010/[-1.37;-0.88]})) 5... Rh5 6. Rag6 Rxa5+ {(Tf5)}
7. Kb1 {(Kb2)} Re1+ {-0.32;-0.98: 'Beide letzter Buchzug'} (7... Ree5 {(Tb5+)}
8. Kc2 {(Kb2)} Rec5+ {(Ted5)} 9. Kd3 {(Kd2)} Ra3+ {(Td5+)} 10. Kd4 Rb5 11. Rg3
Rb4+ {(Ta4+)} 12. Ke5 Ra5+ 13. Kf6 Rb6+ {(Ta6+)} 14. Ke7 Rc6 {(Te5+)} 15. R3g6
{(Te3)} Rc4 16. Kf7 {(Tg1)} Rd4 {(Lc6)} 17. Kg8 {(Tf6)} Ra8+ 18. Kh7 Rf8 {(Te8)
} 19. Ra6 {(Te7)} Rf1 {(Th4+)} 20. Kg8 {(Tag6)} Kb7 {(Te1)} 21. Rag6 Re1 {(Kc8)
} 22. Rf6 {(Tf7)} Rd2 {(Te8+)} 23. Rgg6 {(Tgf7)} Rc2 {(Te7)} 24. Rf7 Rd1 {
(Te8+)} 25. Re7 {(Kg7)} Rf2 {(Kc7)} 26. Kg7 Rb2 {(Kc7)} 27. Rh6 {(Tge6)} Rc2 {
(Ta2)} 28. Rf6 {(Tg6)} Rc3 {(Tg2+)} 29. Ref7 {(Tf2)} Kc7 {(Tcc1)} 30. Ra6 {
(Tf3)} Rcd3 {(Tg3+)} 31. Rff6 Rg3+ 32. Rg6 Re3 {(Tc3)} 33. Ra7+ Kb8 34. Ra2 {
(Taa6)} Be6 35. Ra6 Bd5 36. Rgd6 Rc3 {(Tg3+)} 37. Rg6 {(Tdb6+)} Be4 {(Tf3)} 38.
Rge6 {(Tg4)} Rg1+ {(Tg3+)} 39. Kf6 {(Kf8)} Kb7 {(Ld5)} 40. Rad6 {(Ta5)} Kc7 41.
Ke7 Bc6 42. Rg6 {(Kf7)} Rgc1 {(Tf1)} 43. Kf8 {(Kf7)} Rc5 {(Te1)} 44. Rdf6 Re5 {
(Kb6)} 45. Re6 {(Kg7)} Rd5 46. Re7+ {(Kg7)} Kb6 47. Kg7 {(Kf7)} Rd4 {(Td8)} 48.
Rg3 {(Kh7)} Rd8 {(Td6)} 49. Rb3+ {(Tge3)} Kc5 50. Ree3 Rg1+ {(Kc4)} 51. Rg3 Ra1
{(Tgd1)} 52. Rgc3+ Kd6 {Remis angenommen}) 8. Kb2 Re2+ 9. Kc3 Rf2 {(Ta4)} 10.
Kb3 {(Kd4)} Rf3+ 11. Kb2 Re5 {(Taa3)} 12. Rg2 Rd5 13. R7g3 {(Te2)} Rb5+ 14. Kc1
{(Kc2)} Rf1+ 15. Kd2 Bf5 16. Rg1 {(Ke2)} Rf4 {(Tf2+)} 17. Ra3 Rh4 {(Kd6)} 18.
Rga1 {(Tgg3)} Be4 19. Ra7+ {(Tg3)} Bb7 {(Kd6)} 20. R1a3 {(T1a2)} Rh2+ 21. Kc3
Kb6 {(Tc5+)} 22. R7a4 Bc6 23. Ra6+ Kc5 24. R6a5 {(T6a4)} Rxa5 {(Th3+)} 25.
Rxa5+ Bb5 26. Ra1 Re2 27. Rb1 Re3+ 28. Kd2 Re5 29. Re1 Rf5 {Remis angenommen 1/
2-1/2 Rybka 3 32-bit4-FireBird 1.1 w32/Dort 2010/[-0.32;-0.98]} 1/2-1/2

[kingliveson]

Even if I'm not sure neither, to me it seems to be very drawish, if white manages to get his rooks in a line preventing his king from being castled.
To reach a position like the one on diagram, the pawn must be given away at the right moment, to be kept it isn't anyway. This is after the 6th white move of the main variant below.

[d]8/2kb2R1/6R1/P6r/8/4r3/K7/8 b - - 0 6

Here are three examples of matches. Firebird 1.1 with 5 MOB bitbases managed to win against Deep Fritz 12 with 5 MOB tablebases once, I guess by white error, I marked with ?!.
DF 12 with white drawed against FB and so did FB against R3. All the games were on Quad with 512 Mb hash each side and 40 moves in 90 minutes.

[Event "PCWINXP, 90'/40+60'/20+30'"]
[Site "Dort"]
[Date "2010.02.23"]
[Round "1"]
[White "DF12"]
[Black "FB1.1"]
[Result "1/2-1/2"]
[Annotator "-0.88;-1.42"]
[SetUp "1"]
[FEN "2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - - 0 1"]
[PlyCount "58"]

{Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz 2392 MHz W=23.8 plies; 3.
363kN/s; 1.852.767.858 TBAs B=19.4 plies; 8.724kN/s; 23.683.214 TBAs -0.32;
-0.98: 'Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz 2392 MHz W=22.1 plies;
96kN/s; 1.234.123 TBAs B=24.4 plies; 3.641kN/s; 747.569.035 TBAs '} 1. Rg8+ {
Beide letzter Buchzug} Kc7 2. Ra6 Rb5+ 3. Ka3 Rc3+ 4. Ka2 Re3 5. Rg7 {(Tgg6)} (
5. Rgg6 {(Tg7)} Rh5 6. Rg2 (6. Rh6 $6 Rd5 {(Tf5)} 7. Rh2 Be6 8. Ka1 Rb5 {(Tg5)}
9. Rh7+ Bd7 10. Ka2 Rf5 {(Tg5)} 11. Rh2 Be6+ 12. Kb2 Rb5+ 13. Kc1 Bf5 14. Rb6 (
14. Ra7+ Kb8 15. Ra6) 14... Rxa5 15. Rhb2 {(Tbb2)} Ra1+ {0-1 Deep Fritz
12-FireBird 1.1 w32/Dort 2010/[-1.37;-0.88]})) 5... Rh5 6. Rag6 Rxa5+ {(Tf5)}
7. Kb1 {(Kb2)} Re1+ {-0.32;-0.98: 'Beide letzter Buchzug'} (7... Ree5 {(Tb5+)}
8. Kc2 {(Kb2)} Rec5+ {(Ted5)} 9. Kd3 {(Kd2)} Ra3+ {(Td5+)} 10. Kd4 Rb5 11. Rg3
Rb4+ {(Ta4+)} 12. Ke5 Ra5+ 13. Kf6 Rb6+ {(Ta6+)} 14. Ke7 Rc6 {(Te5+)} 15. R3g6
{(Te3)} Rc4 16. Kf7 {(Tg1)} Rd4 {(Lc6)} 17. Kg8 {(Tf6)} Ra8+ 18. Kh7 Rf8 {(Te8)
} 19. Ra6 {(Te7)} Rf1 {(Th4+)} 20. Kg8 {(Tag6)} Kb7 {(Te1)} 21. Rag6 Re1 {(Kc8)
} 22. Rf6 {(Tf7)} Rd2 {(Te8+)} 23. Rgg6 {(Tgf7)} Rc2 {(Te7)} 24. Rf7 Rd1 {
(Te8+)} 25. Re7 {(Kg7)} Rf2 {(Kc7)} 26. Kg7 Rb2 {(Kc7)} 27. Rh6 {(Tge6)} Rc2 {
(Ta2)} 28. Rf6 {(Tg6)} Rc3 {(Tg2+)} 29. Ref7 {(Tf2)} Kc7 {(Tcc1)} 30. Ra6 {
(Tf3)} Rcd3 {(Tg3+)} 31. Rff6 Rg3+ 32. Rg6 Re3 {(Tc3)} 33. Ra7+ Kb8 34. Ra2 {
(Taa6)} Be6 35. Ra6 Bd5 36. Rgd6 Rc3 {(Tg3+)} 37. Rg6 {(Tdb6+)} Be4 {(Tf3)} 38.
Rge6 {(Tg4)} Rg1+ {(Tg3+)} 39. Kf6 {(Kf8)} Kb7 {(Ld5)} 40. Rad6 {(Ta5)} Kc7 41.
Ke7 Bc6 42. Rg6 {(Kf7)} Rgc1 {(Tf1)} 43. Kf8 {(Kf7)} Rc5 {(Te1)} 44. Rdf6 Re5 {
(Kb6)} 45. Re6 {(Kg7)} Rd5 46. Re7+ {(Kg7)} Kb6 47. Kg7 {(Kf7)} Rd4 {(Td8)} 48.
Rg3 {(Kh7)} Rd8 {(Td6)} 49. Rb3+ {(Tge3)} Kc5 50. Ree3 Rg1+ {(Kc4)} 51. Rg3 Ra1
{(Tgd1)} 52. Rgc3+ Kd6 {Remis angenommen}) 8. Kb2 Re2+ 9. Kc3 Rf2 {(Ta4)} 10.
Kb3 {(Kd4)} Rf3+ 11. Kb2 Re5 {(Taa3)} 12. Rg2 Rd5 13. R7g3 {(Te2)} Rb5+ 14. Kc1
{(Kc2)} Rf1+ 15. Kd2 Bf5 16. Rg1 {(Ke2)} Rf4 {(Tf2+)} 17. Ra3 Rh4 {(Kd6)} 18.
Rga1 {(Tgg3)} Be4 19. Ra7+ {(Tg3)} Bb7 {(Kd6)} 20. R1a3 {(T1a2)} Rh2+ 21. Kc3
Kb6 {(Tc5+)} 22. R7a4 Bc6 23. Ra6+ Kc5 24. R6a5 {(T6a4)} Rxa5 {(Th3+)} 25.
Rxa5+ Bb5 26. Ra1 Re2 27. Rb1 Re3+ 28. Kd2 Re5 29. Re1 Rf5 {Remis angenommen 1/
2-1/2 Rybka 3 32-bit4-FireBird 1.1 w32/Dort 2010/[-0.32;-0.98]} 1/2-1/2

At first glance, one immediately leans toward draw, but as you begin to analyze, it gets more interesting. I think a 7-piece table is probably the only solution. Or if anyone is interested, we could play this position out. You use whatever resources are at your disposal. It would be fun.

[peter]

At first glance, one immediately leans toward draw, but as you begin to analyze, it gets more interesting. I think a 7-piece table is probably the only solution. Or if anyone is interested, we could play this position out. You use whatever resources are at your disposal. It would be fun.

I guess it would, but the fun would be greater for black yet.

I have to admit already after looking at it a little deeper that there are obvious mistakes in the games I posted:

At 20... Rh2? maybe gives away the at this point already certain black win?
20... Kd6! cannot be hold by white, as it seems to me, at least not with 21. Rg3?! as in my last example, the robbobases are quite buggy there or Firebird 1.1 doesn't read them correctly, otherwise he might not have exchanged rooks in the follow up of the game in my last posting.

[d] 8/Rb6/3k4/1r6/7r/6R1/3K4/8 b - - 0 21

The correct MV after this:

21... Rh2+ 22. Kc3 Bd5 23. Ra6+ Kc5 24. Ra3 Rhb2 25. Rd3 Rf2 26. Rd2
Rf8 27. Rd1 Bc4 and -#29 already.

Sorry for this patzer- like one of before: 20. R1a3 Rh2+ 21. Kc3
Kb6 22. R7a4 Bc6 23. Ra6+ Kc5 24. R6a5?? Rxa5 25.
Rxa5+ Bb5 26. Ra1 Re2 27. Rb1 Re3+ 28. Kd2 Re5 29. Re1 Rf5

Still there is some doubt about 21. R7a4!? after 21... Kd6! and especially after 20. R1a2!?

[d] 8/Rbk5/8/1r6/7r/8/R2K4/8 b - - 0 20

Here's the MV again, leading to this:

2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - - 0 1

1. Rg8+ Kc7 2. Ra6 Rb5+ 3. Ka3 Rc3+ 4. Ka2 Re3 5. Rg7 Rh5 6. Rag6 Rxa5+ 7. Kb1
Re1+ 8. Kb2 Re2+ 9. Kc3 Rf2 10. Kb3 Rf3+ 11. Kb2 Re5 12. Rg2 Rd5 13. R7g3 Rb5+
14. Kc1 Rf1+ 15. Kd2 Bf5 16. Rg1 Rf4 17. Ra3 Rh4 18. Rga1 Be4 19. Ra7+ Bb7 20.
R1a2

My opinion right now is black should win, if you don't read any further change of mind, thanks for showing the fine position, if I yet find patzer- free remis, I'd gladly come back to your offer for playing it out.

[Terry McCracken]

I think this postion should be a draw but it's no mean feat to avoid all the potential zugzwangs if White fouls up.

It's an easy draw like Lawerence said earlier if you reduce it to K+R to K+R+B. GM's have had difficulty in such endings but it should be a technical draw even with all material on the board.

Engines will go wrong often in these positions...one weak move may spell death.

[peter]

I think this postion should be a draw but it's no mean feat to avoid all the potential zugzwangs if White fouls up.

It's an easy draw like Lawerence said earlier if you reduce it to K+R to K+R+B. GM's have had difficulty in such endings but it should be a technical draw even with all material on the board.

Engines will go wrong often in these positions...one weak move may spell death.

Maybe you're right, maybe not. Can you find an error in this variant changing the outcome?


2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - - 0 1

1. Rg8+ Kc7 2. Ra6 Rb5+ 3. Ka3 Rc3+ 4. Ka2 Re3 5. Rg7 Rh5 6. Rag6 Rxa5+ 7. Kb1
Re1+ 8. Kb2 Re2+ 9. Kc3 Rf2 10. Kb3 Rf3+ 11. Kb2 Re5 12. Rg2 Rd5 13. R7g3 Rb5+
14. Kc1 Rf1+ 15. Kd2 Bf5 16. Rg1 Rf4 17. Ra3 Rh4 18. Rga1 Be4 19. Ra7+ Bb7 20.
R1a2 Rg5 21. Rc2+ Kb6 22. Ra3 Bd5 23. Rac3 Kb5 24. Rc8 Ka4 25. Ke1 Rh3 26. R8c3
Rg1+ 27. Kd2 Rg2+ 28. Kc1 Rh1+ 29. Kb2 Rg4 30. Re3 Rd1 31. Ra3+ Kb5 32. Rh2
Rb4+ 33. Kc2 Rg1 34. Rah3 Be4+ 35. Kd2 Kc5 36. Rh8 Rb3 37. Rc8+ Kd6 38. Rh6+
Kd7 39. Rc3 Rg2+ 40. Ke3 Rxc3+ 41. Kd4 Rd3+ 42. Kxe4 Rd6 43. Rh7+ Ke8 44. Ke3
Rg1 45. Ke2 Rg5 46. Kf3 Re5 47. Kf4 Re7 48. Rh3 Rf6+ 49. Kg5 Ref7 50. Rb3 Kf8
51. Rb5 Kg7 52. Kh4 Kg8 53. Rb8+ Kh7 54. Rb5 Rg7 55. Rg5 Rfg6 56. Rxg6 Rxg6 57.
Kh3 Kg7 58. Kh4 Kh6 59. Kh3 Kh5 60. Kh2 Kh4 61. Kh1 Kg3 62. Kg1 Rf6 63. Kh1
Rf1# 0-1

[kingliveson]

I think this postion should be a draw but it's no mean feat to avoid all the potential zugzwangs if White fouls up.

It's an easy draw like Lawerence said earlier if you reduce it to K+R to K+R+B. GM's have had difficulty in such endings but it should be a technical draw even with all material on the board.

Engines will go wrong often in these positions...one weak move may spell death.

Maybe you're right, maybe not. Can you find an error in this variant changing the outcome?


[d]2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - - 0 1

1. Rg8+ Kc7 2. Ra6 Rb5+ 3. Ka3 Rc3+ 4. Ka2 Re3 5. Rg7 Rh5 6. Rag6 Rxa5+ 7. Kb1
Re1+ 8. Kb2 Re2+ 9. Kc3 Rf2 10. Kb3 Rf3+ 11. Kb2 Re5 12. Rg2 Rd5 13. R7g3 Rb5+
14. Kc1 Rf1+ 15. Kd2 Bf5 16. Rg1 Rf4 17. Ra3 Rh4 18. Rga1 Be4 19. Ra7+ Bb7 20.
R1a2 Rg5 21. Rc2+ Kb6 22. Ra3 Bd5 23. Rac3 Kb5 24. Rc8 Ka4 25. Ke1 Rh3 26. R8c3
Rg1+ 27. Kd2 Rg2+ 28. Kc1 Rh1+ 29. Kb2 Rg4 30. Re3 Rd1 31. Ra3+ Kb5 32. Rh2
Rb4+ 33. Kc2 Rg1 34. Rah3 Be4+ 35. Kd2 Kc5 36. Rh8 Rb3 37. Rc8+ Kd6 38. Rh6+
Kd7 39. Rc3 Rg2+ 40. Ke3 Rxc3+ 41. Kd4 Rd3+ 42. Kxe4 Rd6 43. Rh7+ Ke8 44. Ke3
Rg1 45. Ke2 Rg5 46. Kf3 Re5 47. Kf4 Re7 48. Rh3 Rf6+ 49. Kg5 Ref7 50. Rb3 Kf8
51. Rb5 Kg7 52. Kh4 Kg8 53. Rb8+ Kh7 54. Rb5 Rg7 55. Rg5 Rfg6 56. Rxg6 Rxg6 57.
Kh3 Kg7 58. Kh4 Kh6 59. Kh3 Kh5 60. Kh2 Kh4 61. Kh1 Kg3 62. Kg1 Rf6 63. Kh1
Rf1# 0-1

Rg8+ is not the best move as it immediately gives more power to an already empowered Bishop while leaving the white King exposed to the attacking Rooks.