Is this position a lost?
[d]2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - - 0 69
Can it be Saved?
Moderator: Ras
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Togga
Re: Can it be Saved?
it is a draw?
rybka 2.3.2a with nalimov tablebases 3-4-5:
[-0.25] d=19 12.a6 Rb5+ 13.Ka3 Rc3+ 14.Ka2 Re3 15.Rh8+ Kc7 16.Rhh7 Rd3 17.Rh6 Rd4 18.Rg3 Bc6 (0:09.39)
[-0.24] d=18 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.Rh3 Rb1 16.Ka2 Rb6 17.a7 Ra6+ 18.Kb2 Rxa7 (0:04.32)
[-0.21] d=17 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.Rhh7 Kb6 16.Re7 Rxe7 17.Rxe7 Kc7 18.a7 Ra5+ (0:02.52)
[-0.24] d=17 12.Kb3 Rc7 13.Rg8+ Kb7 14.Rb6+ Ka7 15.Rgg6 Rxa5 16.Rgf6 Bf5 17.Rbc6 Rb7+ 18.Kc3 Ra3+ (0:02.18)
[-0.23] d=16 12.Kb3 Rc7 13.Rg8+ Kb7 14.Rb6+ Ka7 15.Rgg6 Rxa5 16.Rgf6 Bf5 17.Rbc6 Rb7+ 18.Kc3 Ra3+ (0:01.12)
[-0.22] d=15 12.Kb3 Rc7 13.Rg8+ Kb7 14.Rb6+ Ka7 15.Rgg6 Rxa5 16.Rgd6 Rcc5 17.Rf6 Rg5 18.Kb2 Rg2+ (0:00.54)
[-0.22] d=14 12.Kb3 Rc7 13.Rg8+ Kb7 14.Rb6+ Ka7 15.Rgg6 Rxa5 16.Rgd6 Bf5 17.Kb4 Ra1 18.Rb5 Be4 (0:00.36)
[-0.21] d=13 12.Kb3 Rc7 13.Rg8+ Kb7 14.Rb6+ Ka7 15.Rgg6 Rxa5 16.Rh6 Bf5 17.Kb4 Ra1 18.Rb5 (0:00.29)
[-0.23] d=13 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.a7 Ra5+ 16.Kb3 Rxa7 17.Rh6 Raa4 18.Rf7 Re3+ (0:00.26)
[-0.21] d=12 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.a7 Ra5+ 16.Kb3 Rxa7 17.Rh6 Raa4 18.Kb2 (0:00.13)
[-0.18] d=11 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.a7 Ra5+ 16.Kb3 Rxa7 17.Rh6 Raa4 (0:00.05)
[-0.13] d=10 12.a6 Rb5+ 13.Ka3 Re4 14.Rg3 Ra5+ 15.Kb2 Re2+ 16.Kb3 Be6+ 17.Kb4 (0:00.02)
[-0.12] d=9 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.Rhh7 Rd4 (0:00.00)
[-0.07] d=8 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.Rhh7 (0:00.00)
rybka 2.3.2a with nalimov tablebases 3-4-5:
[-0.25] d=19 12.a6 Rb5+ 13.Ka3 Rc3+ 14.Ka2 Re3 15.Rh8+ Kc7 16.Rhh7 Rd3 17.Rh6 Rd4 18.Rg3 Bc6 (0:09.39)
[-0.24] d=18 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.Rh3 Rb1 16.Ka2 Rb6 17.a7 Ra6+ 18.Kb2 Rxa7 (0:04.32)
[-0.21] d=17 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.Rhh7 Kb6 16.Re7 Rxe7 17.Rxe7 Kc7 18.a7 Ra5+ (0:02.52)
[-0.24] d=17 12.Kb3 Rc7 13.Rg8+ Kb7 14.Rb6+ Ka7 15.Rgg6 Rxa5 16.Rgf6 Bf5 17.Rbc6 Rb7+ 18.Kc3 Ra3+ (0:02.18)
[-0.23] d=16 12.Kb3 Rc7 13.Rg8+ Kb7 14.Rb6+ Ka7 15.Rgg6 Rxa5 16.Rgf6 Bf5 17.Rbc6 Rb7+ 18.Kc3 Ra3+ (0:01.12)
[-0.22] d=15 12.Kb3 Rc7 13.Rg8+ Kb7 14.Rb6+ Ka7 15.Rgg6 Rxa5 16.Rgd6 Rcc5 17.Rf6 Rg5 18.Kb2 Rg2+ (0:00.54)
[-0.22] d=14 12.Kb3 Rc7 13.Rg8+ Kb7 14.Rb6+ Ka7 15.Rgg6 Rxa5 16.Rgd6 Bf5 17.Kb4 Ra1 18.Rb5 Be4 (0:00.36)
[-0.21] d=13 12.Kb3 Rc7 13.Rg8+ Kb7 14.Rb6+ Ka7 15.Rgg6 Rxa5 16.Rh6 Bf5 17.Kb4 Ra1 18.Rb5 (0:00.29)
[-0.23] d=13 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.a7 Ra5+ 16.Kb3 Rxa7 17.Rh6 Raa4 18.Rf7 Re3+ (0:00.26)
[-0.21] d=12 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.a7 Ra5+ 16.Kb3 Rxa7 17.Rh6 Raa4 18.Kb2 (0:00.13)
[-0.18] d=11 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.a7 Ra5+ 16.Kb3 Rxa7 17.Rh6 Raa4 (0:00.05)
[-0.13] d=10 12.a6 Rb5+ 13.Ka3 Re4 14.Rg3 Ra5+ 15.Kb2 Re2+ 16.Kb3 Be6+ 17.Kb4 (0:00.02)
[-0.12] d=9 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.Rhh7 Rd4 (0:00.00)
[-0.07] d=8 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.Rhh7 (0:00.00)
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kingliveson
Re: Can it be Saved?
Well, it looks likes it should be draw. But seems to get more complicated for White as the game progressed. Rybka actually lost this game with 3-4-5 Nalimov set at frequent access.Togga wrote:it is a draw?
rybka 2.3.2a with nalimov tablebases 3-4-5:
[-0.25] d=19 12.a6 Rb5+ 13.Ka3 Rc3+ 14.Ka2 Re3 15.Rh8+ Kc7 16.Rhh7 Rd3 17.Rh6 Rd4 18.Rg3 Bc6 (0:09.39)
[-0.24] d=18 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.Rh3 Rb1 16.Ka2 Rb6 17.a7 Ra6+ 18.Kb2 Rxa7 (0:04.32)
[-0.21] d=17 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.Rhh7 Kb6 16.Re7 Rxe7 17.Rxe7 Kc7 18.a7 Ra5+ (0:02.52)
[-0.24] d=17 12.Kb3 Rc7 13.Rg8+ Kb7 14.Rb6+ Ka7 15.Rgg6 Rxa5 16.Rgf6 Bf5 17.Rbc6 Rb7+ 18.Kc3 Ra3+ (0:02.18)
[-0.23] d=16 12.Kb3 Rc7 13.Rg8+ Kb7 14.Rb6+ Ka7 15.Rgg6 Rxa5 16.Rgf6 Bf5 17.Rbc6 Rb7+ 18.Kc3 Ra3+ (0:01.12)
[-0.22] d=15 12.Kb3 Rc7 13.Rg8+ Kb7 14.Rb6+ Ka7 15.Rgg6 Rxa5 16.Rgd6 Rcc5 17.Rf6 Rg5 18.Kb2 Rg2+ (0:00.54)
[-0.22] d=14 12.Kb3 Rc7 13.Rg8+ Kb7 14.Rb6+ Ka7 15.Rgg6 Rxa5 16.Rgd6 Bf5 17.Kb4 Ra1 18.Rb5 Be4 (0:00.36)
[-0.21] d=13 12.Kb3 Rc7 13.Rg8+ Kb7 14.Rb6+ Ka7 15.Rgg6 Rxa5 16.Rh6 Bf5 17.Kb4 Ra1 18.Rb5 (0:00.29)
[-0.23] d=13 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.a7 Ra5+ 16.Kb3 Rxa7 17.Rh6 Raa4 18.Rf7 Re3+ (0:00.26)
[-0.21] d=12 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.a7 Ra5+ 16.Kb3 Rxa7 17.Rh6 Raa4 18.Kb2 (0:00.13)
[-0.18] d=11 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.a7 Ra5+ 16.Kb3 Rxa7 17.Rh6 Raa4 (0:00.05)
[-0.13] d=10 12.a6 Rb5+ 13.Ka3 Re4 14.Rg3 Ra5+ 15.Kb2 Re2+ 16.Kb3 Be6+ 17.Kb4 (0:00.02)
[-0.12] d=9 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.Rhh7 Rd4 (0:00.00)
[-0.07] d=8 12.a6 Rb5+ 13.Ka3 Re4 14.Rh8+ Kc7 15.Rhh7 (0:00.00)
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kingliveson
Re: Can it be Saved?
Sorry, I edited my comments, but W. is white.Togga wrote:who is W. ?
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kingliveson
Re: Can it be Saved?
It looks more and more to be a lost, not draw. It's really an interesting position.
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Eelco de Groot
- Posts: 4663
- Joined: Sun Mar 12, 2006 2:40 am
- Full name: Eelco de Groot
Re: Can it be Saved?
It seemed fairly drawish to me, but the leafposition I checked at the end is won.
[d]2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - -
Engine: Rainbow Serpent 1.6.3s(dc) Build 125 (Athlon 2009 MHz, 128 MB)
by Tord Romstad, Marco Costalba, Joona Kiiski Modifications: Dann Corbit
1.00 0:00 -0.80 1.a6 (737) 6
2.00 0:00 -0.88 1.a6 Kc7 (825) 6
3.00 0:00 -0.92 1.a6 Kc7 2.a7 Rb5+ 3.Ka3 Ra5+ 4.Kb3 (1.588) 12
4.00 0:00 -0.92 1.a6 Kc7 2.a7 Rb5+ 3.Ka3 Ra5+ 4.Kb3 (3.229) 25
5.00 0:00 -0.92 1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Kc7 4.a7 Ra5+
5.Kb2 (9.307) 74
6.00 0:00 -0.92 1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Kc7 4.a7 Rc2+
5.Ka3 Ra5+ 6.Kb3 (12.424) 88
7.00 0:00 -0.96 1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Kc7 4.Re6 Ra5+
5.Kb2 Rh3 6.Rge7 Rh2+ 7.Kb3 (32.574) 189
8.00 0:00 -1.01 1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Re3
4.Rh8+ Kc7 5.Rhh7 Ra5+ 6.Kb2 Rd3
7.Rg6 Raa3 8.Re7 Rdb3+ 9.Kc2 (65.165) 297
9.00 0:00 -1.01 1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Re3
4.Rh8+ Kc7 5.Rhh7 Ra5+ 6.Kb2 Rd3
7.Rg6 Raa3 8.Re7 Rdb3+ 9.Kc2 Rc3+
10.Kb2 (122.078) 411
10.00 0:00 -1.01 1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Re3
4.Rgg6 Ra5+ 5.Kb2 Re2+ 6.Kb3 Re1
7.Rg7 Kc7 8.Kb2 Ra4 9.Kb3 Rb1+
10.Kc3 (394.631) 561
11.00 0:02 -1.21-- 1.a6 Rb5+ 2.Ka3 Re4 3.Rh8+ Kc7
4.Rhh7 Rd4 5.Rg6 Rb8 (1.603.749) 666
12.01 0:04 -1.41 1.a6 Rb5+ 2.Ka3 Re4 3.Rg3 Ra5+ 4.Kb2 Re2+
5.Kb3 Be6+ 6.Kb4 Rxa6 7.Rg7 Rb2+
8.Kc3 Rb3+ 9.Kd2 Ra2+ 10.Kc1 Ra1+
11.Kd2 Rb2+ 12.Ke3 Ra3+ 13.Kd4 Rd2+
14.Kc5 (3.193.804) 695
12.02 0:08 -1.17 1.Rh8+ Kc7 2.Kb3 Rcc5 3.Ra8 Kb7
4.Rd8 Rb5+ 5.Kc3 Rec5+ 6.Kd3 Rd5+
7.Kc4 Rbc5+ 8.Kb3 Rd3+ 9.Kb4 Rcd5
10.Rgxd7+ Rxd7 11.Rxd7+ Rxd7 12.Kc4 (6.160.944) 713
13.01 0:15 -1.25 1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rc6 4.Ra8 Rb5+
5.Ka3 Rc3+ 6.Ka2 Kd6 7.Ra6+ Bc6
8.Rg6+ Kc7 9.Rg7+ Kd8 10.Rg8+ Ke7
11.Ra7+ Ke6 12.Rg6+ Kf5 13.Rd6 Bd5+
14.Ka1 (11.369.527) 735
14.01 0:20 -1.29 1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rc6 4.Rh3 Rd6
5.Rc3+ Kb7 6.Rb3+ Ka7 7.Ra3 Rb5+
8.Kc2 Ka6 9.Ra1 Bf5+ 10.Kc3 Be4 (14.895.221) 743
14.04 0:32 -1.17 1.Rg8+ Kc7 2.Ra6 Rb5+ 3.Ka3 Rc3+
4.Ka2 Rd3 5.Rg7 Rh5 6.Ra7+ Kc6 7.Rg2 Be6+
8.Kb2 Rb5+ 9.Kc1 Ra3 10.Rc2+ Bc4
11.Ra6+ Kc5 12.Ra7 Ra1+ 13.Kd2 Kb4 (24.052.338) 736
15.01 0:41 -1.17 1.Rg8+ Kc7 2.Ra6 Rb5+ 3.Ka3 Rc3+
4.Ka2 Rd3 5.Rg2 Re5 6.Rb2 Be6+ 7.Kb1 Re1+
8.Kc2 Rde3 9.Ra7+ Kd6 10.Rb6+ Kd5
11.Rc7 Bf5+ 12.Kb2 R1e2+ 13.Kc1 Ra2
14.Rb5+ (30.430.266) 735
16.01 1:36 -1.21 1.Rg8+ Kc7 2.Ra6 Rb5+ 3.Ka3 Rc3+
4.Ka2 Re5 5.Kb2 Rd3 6.Kc2 Rh3 7.Ra7+ Kc6
8.Rg6+ Be6 9.Kd2 Kb5 10.a6 Rh2+
11.Kc3 Rhe2 12.Rh6 Rc5+ 13.Kd3 Bc4+
14.Kc3 (69.956.780) 725
17.01 2:02 -1.29 1.Rg8+ Kc7 2.Ra6 Rb5+ 3.Ka3 Rc3+
4.Ka2 Re5 5.Kb2 Rd3 6.Kc2 Rh3 7.Ra7+ Kc6
8.Rg6+ Be6 9.Ra6+ Kd5 10.Rg2 Kc4
11.Kc1 Rh1+ 12.Kc2 Bd5 13.Rd2 Bb7
14.Ra7 (89.067.945) 727
17.02 2:22 -1.17 1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rc6 4.Rh3 Rd6
5.Rc3+ Kb7 6.Rb3+ Ka7 7.Kc2 Rc5+
8.Rc3 Rcd5 9.Rb3 Rd2+ 10.Kc3 R6d3+
11.Kc4 Rd5 12.Rb2 Rd1 13.Rb1 (104.330.398) 731
18.01 3:36 -1.21 1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rc6 4.Rh3 Rd6
5.Rc3+ Kb7 6.Rb3+ Ka7 7.Kc2 Rc5+
8.Rc3 Rcd5 9.Rb3 Rd2+ 10.Kc3 R6d3+
11.Kc4 Rd5 12.Ra3 Rd1 13.Kb4 Ka6
14.Ra2 (159.644.391) 737
19.01 4:18 -1.21 1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rc6 4.Rh3 Rd6
5.Rc3+ Kb7 6.Rb3+ Ka7 7.Kc2 Rc5+
8.Rc3 Rcd5 9.Rb3 Rd2+ 10.Kc3 R6d3+
11.Kc4 Rd5 12.Ra3 Kb7 13.Kb4 Ka6
14.Rg6+ (192.169.763) 742
20.01 7:27 -1.29 1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rcc5
4.Ra8 Kc6 5.Ra7 Re2+ 6.Ka3 Re3+
7.Kb2 Rb5+ 8.Kc1 Bf5 9.Kd2 Rd3+
10.Kc1 Rh3 11.Rgc7+ Kd5 12.Rcb7 Rc5+
13.Kd1 Rd3+ 14.Ke1 (331.744.675) 741
21.01 12:51 -1.29 1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rcc5
4.Ra8 Kc6 5.Ra7 Re2+ 6.Ka3 Re3+
7.Kb2 Rb5+ 8.Kc1 Bf5 9.Rgc7+ Kd6
10.Rcb7 Rc5+ 11.Kd1 Rh3 12.Rb6+ Kd5
13.Rbb7 Rd3+ 14.Ke1
{[d]8/RR6/8/P1rk1b2/8/3r4/8/4K3 b - - 0 1
This is a clear win for Black:
+83.15 1...Rc1+ 2.Ke2 Rc2+ 3.Ke1 Rh3 4.Rb5+ Ke4
5.Re7+ Kf4 6.Rb4+ Kg5 7.Rg7+ Bg6
8.Rb5+ Kf6 9.Rxg6+ Kxg6 10.Rb6+ Kg5
11.Rb5+ Kf6 12.Rb6+ Ke5 13.Rb5+ Ke6
14.Rb6+ Kd5}
(571.251.174) 740
best move: Rh6-h8 time: 18:42.766 min n/s: 709.970 nodes: 797.130.162
[d]2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - -
Engine: Rainbow Serpent 1.6.3s(dc) Build 125 (Athlon 2009 MHz, 128 MB)
by Tord Romstad, Marco Costalba, Joona Kiiski Modifications: Dann Corbit
1.00 0:00 -0.80 1.a6 (737) 6
2.00 0:00 -0.88 1.a6 Kc7 (825) 6
3.00 0:00 -0.92 1.a6 Kc7 2.a7 Rb5+ 3.Ka3 Ra5+ 4.Kb3 (1.588) 12
4.00 0:00 -0.92 1.a6 Kc7 2.a7 Rb5+ 3.Ka3 Ra5+ 4.Kb3 (3.229) 25
5.00 0:00 -0.92 1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Kc7 4.a7 Ra5+
5.Kb2 (9.307) 74
6.00 0:00 -0.92 1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Kc7 4.a7 Rc2+
5.Ka3 Ra5+ 6.Kb3 (12.424) 88
7.00 0:00 -0.96 1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Kc7 4.Re6 Ra5+
5.Kb2 Rh3 6.Rge7 Rh2+ 7.Kb3 (32.574) 189
8.00 0:00 -1.01 1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Re3
4.Rh8+ Kc7 5.Rhh7 Ra5+ 6.Kb2 Rd3
7.Rg6 Raa3 8.Re7 Rdb3+ 9.Kc2 (65.165) 297
9.00 0:00 -1.01 1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Re3
4.Rh8+ Kc7 5.Rhh7 Ra5+ 6.Kb2 Rd3
7.Rg6 Raa3 8.Re7 Rdb3+ 9.Kc2 Rc3+
10.Kb2 (122.078) 411
10.00 0:00 -1.01 1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Re3
4.Rgg6 Ra5+ 5.Kb2 Re2+ 6.Kb3 Re1
7.Rg7 Kc7 8.Kb2 Ra4 9.Kb3 Rb1+
10.Kc3 (394.631) 561
11.00 0:02 -1.21-- 1.a6 Rb5+ 2.Ka3 Re4 3.Rh8+ Kc7
4.Rhh7 Rd4 5.Rg6 Rb8 (1.603.749) 666
12.01 0:04 -1.41 1.a6 Rb5+ 2.Ka3 Re4 3.Rg3 Ra5+ 4.Kb2 Re2+
5.Kb3 Be6+ 6.Kb4 Rxa6 7.Rg7 Rb2+
8.Kc3 Rb3+ 9.Kd2 Ra2+ 10.Kc1 Ra1+
11.Kd2 Rb2+ 12.Ke3 Ra3+ 13.Kd4 Rd2+
14.Kc5 (3.193.804) 695
12.02 0:08 -1.17 1.Rh8+ Kc7 2.Kb3 Rcc5 3.Ra8 Kb7
4.Rd8 Rb5+ 5.Kc3 Rec5+ 6.Kd3 Rd5+
7.Kc4 Rbc5+ 8.Kb3 Rd3+ 9.Kb4 Rcd5
10.Rgxd7+ Rxd7 11.Rxd7+ Rxd7 12.Kc4 (6.160.944) 713
13.01 0:15 -1.25 1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rc6 4.Ra8 Rb5+
5.Ka3 Rc3+ 6.Ka2 Kd6 7.Ra6+ Bc6
8.Rg6+ Kc7 9.Rg7+ Kd8 10.Rg8+ Ke7
11.Ra7+ Ke6 12.Rg6+ Kf5 13.Rd6 Bd5+
14.Ka1 (11.369.527) 735
14.01 0:20 -1.29 1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rc6 4.Rh3 Rd6
5.Rc3+ Kb7 6.Rb3+ Ka7 7.Ra3 Rb5+
8.Kc2 Ka6 9.Ra1 Bf5+ 10.Kc3 Be4 (14.895.221) 743
14.04 0:32 -1.17 1.Rg8+ Kc7 2.Ra6 Rb5+ 3.Ka3 Rc3+
4.Ka2 Rd3 5.Rg7 Rh5 6.Ra7+ Kc6 7.Rg2 Be6+
8.Kb2 Rb5+ 9.Kc1 Ra3 10.Rc2+ Bc4
11.Ra6+ Kc5 12.Ra7 Ra1+ 13.Kd2 Kb4 (24.052.338) 736
15.01 0:41 -1.17 1.Rg8+ Kc7 2.Ra6 Rb5+ 3.Ka3 Rc3+
4.Ka2 Rd3 5.Rg2 Re5 6.Rb2 Be6+ 7.Kb1 Re1+
8.Kc2 Rde3 9.Ra7+ Kd6 10.Rb6+ Kd5
11.Rc7 Bf5+ 12.Kb2 R1e2+ 13.Kc1 Ra2
14.Rb5+ (30.430.266) 735
16.01 1:36 -1.21 1.Rg8+ Kc7 2.Ra6 Rb5+ 3.Ka3 Rc3+
4.Ka2 Re5 5.Kb2 Rd3 6.Kc2 Rh3 7.Ra7+ Kc6
8.Rg6+ Be6 9.Kd2 Kb5 10.a6 Rh2+
11.Kc3 Rhe2 12.Rh6 Rc5+ 13.Kd3 Bc4+
14.Kc3 (69.956.780) 725
17.01 2:02 -1.29 1.Rg8+ Kc7 2.Ra6 Rb5+ 3.Ka3 Rc3+
4.Ka2 Re5 5.Kb2 Rd3 6.Kc2 Rh3 7.Ra7+ Kc6
8.Rg6+ Be6 9.Ra6+ Kd5 10.Rg2 Kc4
11.Kc1 Rh1+ 12.Kc2 Bd5 13.Rd2 Bb7
14.Ra7 (89.067.945) 727
17.02 2:22 -1.17 1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rc6 4.Rh3 Rd6
5.Rc3+ Kb7 6.Rb3+ Ka7 7.Kc2 Rc5+
8.Rc3 Rcd5 9.Rb3 Rd2+ 10.Kc3 R6d3+
11.Kc4 Rd5 12.Rb2 Rd1 13.Rb1 (104.330.398) 731
18.01 3:36 -1.21 1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rc6 4.Rh3 Rd6
5.Rc3+ Kb7 6.Rb3+ Ka7 7.Kc2 Rc5+
8.Rc3 Rcd5 9.Rb3 Rd2+ 10.Kc3 R6d3+
11.Kc4 Rd5 12.Ra3 Rd1 13.Kb4 Ka6
14.Ra2 (159.644.391) 737
19.01 4:18 -1.21 1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rc6 4.Rh3 Rd6
5.Rc3+ Kb7 6.Rb3+ Ka7 7.Kc2 Rc5+
8.Rc3 Rcd5 9.Rb3 Rd2+ 10.Kc3 R6d3+
11.Kc4 Rd5 12.Ra3 Kb7 13.Kb4 Ka6
14.Rg6+ (192.169.763) 742
20.01 7:27 -1.29 1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rcc5
4.Ra8 Kc6 5.Ra7 Re2+ 6.Ka3 Re3+
7.Kb2 Rb5+ 8.Kc1 Bf5 9.Kd2 Rd3+
10.Kc1 Rh3 11.Rgc7+ Kd5 12.Rcb7 Rc5+
13.Kd1 Rd3+ 14.Ke1 (331.744.675) 741
21.01 12:51 -1.29 1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rcc5
4.Ra8 Kc6 5.Ra7 Re2+ 6.Ka3 Re3+
7.Kb2 Rb5+ 8.Kc1 Bf5 9.Rgc7+ Kd6
10.Rcb7 Rc5+ 11.Kd1 Rh3 12.Rb6+ Kd5
13.Rbb7 Rd3+ 14.Ke1
{[d]8/RR6/8/P1rk1b2/8/3r4/8/4K3 b - - 0 1
This is a clear win for Black:
+83.15 1...Rc1+ 2.Ke2 Rc2+ 3.Ke1 Rh3 4.Rb5+ Ke4
5.Re7+ Kf4 6.Rb4+ Kg5 7.Rg7+ Bg6
8.Rb5+ Kf6 9.Rxg6+ Kxg6 10.Rb6+ Kg5
11.Rb5+ Kf6 12.Rb6+ Ke5 13.Rb5+ Ke6
14.Rb6+ Kd5}
(571.251.174) 740
best move: Rh6-h8 time: 18:42.766 min n/s: 709.970 nodes: 797.130.162
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
-
LaurenceChen
- Posts: 101
- Joined: Fri Jun 09, 2006 4:58 am
Re: Can it be Saved?
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.
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kingliveson
Re: Can it be Saved?
Upon further analysis, it looks like sure draw. Here is one route with time control extended to 30 mins 2 secs inc. 7-men (women included) EGTB soon will put some of these to rest.
69. Kb3 Rc7 70. Rg8+ Kb7 71. Rb6+ Ka7 72. Rgg6 Rxa5 73. Kb2 Rc4 74. Rb3
Rac5 75. Ra3+ Ba4 76. Re3 Rc2+ 77. Ka3 Bc6 78. Rh3 Ka6 79. Rg4 Re2 80. Kb4
Rb5+ 81. Kc3 Be4 82. Rhh4 Rc2+ 83. Kd4 Bf5 84. Rh6+ Ka5 85. Rg8 Re2 86.
Ra8+ Kb4 87. Rh4 Kb3 88. Rah8 Re1 89. R8h6 Ree5 90. Rd6 Re7 91. Rdh6 Re8
92. Rh8 Re2 93. R8h6 Re1 94. Rh8 Rb7 95. Kc5 Re5+ 96. Kd6 Re6+ 97. Kc5 Ra6
98. R8h6 Ra5+ 99. Kd4 Ra4+ 100. Kc5 Rc7+ 101. Kd6 Raa7 102. Rf4 Rc3 103.
Rhh4 Ra6+ 104. Ke5 Ra5+ 105. Kd6 Rb5 106. Rd4 Re3 107. Kc6 Rb8 108. Rhf4
Rc3+ 109. Kd6 Bg6 110. Ke7 Bh5 111. Rfe4 Re8+ 112. Kd7 Ra8 113. Rb4+ Ka3
114. Rb1 Rg8 115. Re5 Be8+ 116. Ke6 Ba4 117. Ra5 Rg4 118. Ra7 Ka2 119. Rb8
Rf3 120. Ke5 Ka3 121. Rb1 Re3+ 122. Kd5 Ree4 {50 moves rule} 1/2-1/2
69. Kb3 Rc7 70. Rg8+ Kb7 71. Rb6+ Ka7 72. Rgg6 Rxa5 73. Kb2 Rc4 74. Rb3
Rac5 75. Ra3+ Ba4 76. Re3 Rc2+ 77. Ka3 Bc6 78. Rh3 Ka6 79. Rg4 Re2 80. Kb4
Rb5+ 81. Kc3 Be4 82. Rhh4 Rc2+ 83. Kd4 Bf5 84. Rh6+ Ka5 85. Rg8 Re2 86.
Ra8+ Kb4 87. Rh4 Kb3 88. Rah8 Re1 89. R8h6 Ree5 90. Rd6 Re7 91. Rdh6 Re8
92. Rh8 Re2 93. R8h6 Re1 94. Rh8 Rb7 95. Kc5 Re5+ 96. Kd6 Re6+ 97. Kc5 Ra6
98. R8h6 Ra5+ 99. Kd4 Ra4+ 100. Kc5 Rc7+ 101. Kd6 Raa7 102. Rf4 Rc3 103.
Rhh4 Ra6+ 104. Ke5 Ra5+ 105. Kd6 Rb5 106. Rd4 Re3 107. Kc6 Rb8 108. Rhf4
Rc3+ 109. Kd6 Bg6 110. Ke7 Bh5 111. Rfe4 Re8+ 112. Kd7 Ra8 113. Rb4+ Ka3
114. Rb1 Rg8 115. Re5 Be8+ 116. Ke6 Ba4 117. Ra5 Rg4 118. Ra7 Ka2 119. Rb8
Rf3 120. Ke5 Ka3 121. Rb1 Re3+ 122. Kd5 Ree4 {50 moves rule} 1/2-1/2