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Up Topic The Rybka Lounge / Test Positions / Is there a win for white here?
- - By irulats (****) [gb] Date 2017-06-02 17:53 Upvotes 1
All my engines give a strong material advantage to white but none can find a win. Is it possible?
6k1/5ppp/p1R1p3/1p1r4/8/2Q4P/5PPK/3q4 w - - 0 1
Parent - - By user923005 (****) [us] Date 2017-06-02 21:32
It is not clear whether this is a fortress or not.
There was a fail high on the last ply, so maybe there is a win.
At any rate, it will take a very deep search to know for sure (probably 24 hours or so on a 6 CPU machine).


Searching:
6k1/5ppp/p1R1p3/1p1r4/8/2Q4P/5PPK/3q4 w - - 0 1

infinite: 0 ponder: 0 time: 0 increment: 0 moves to go: 0

1   -0.72   00:00      38  Rxa6
2   -1.64   00:00      81  Rxa6 Rd8
3   +1.81   00:00     160  Rc8+ Rd8 Qc7
4   +3.13   00:00     214  Rc8+ Rd8 Qc7 Qd6+ Qxd6 Rxc8
5   +3.67   00:00     285  Rc8+ Rd8 Qc7 Qd6+ Qxd6 Rxc8
6   +4.05   00:00     367  Rc8+ Rd8 Qc7 Qd6+ Qxd6 Rxc8 Qxa6
7   +4.05   00:00     436  Rc8+ Rd8 Qc7 Qd6+ Qxd6 Rxc8 Qxa6 Rb8
8   +4.19   00:00     683  Rc8+ Rd8 Qc7 Qd6+ Qxd6 Rxc8 Qxa6 Re8 Qxb5
9   +4.44   00:00    1014  Rc8+ Rd8 Qc7 Qd6+ Qxd6 Rxc8 Qxa6 Re8 Qxb5 Rf8 Kg3 Ra8
10   +4.33   00:00    9138  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb7 f5 Kg3 b4 Kf4
11   +4.31   00:00    9979  Rc8+ Rd8 Qc7 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb7 f5 Kg3 Kf8 Qxb5
12   +4.35   00:00   10403  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb7 f5 Kg3 Kf8 f3 Rd8 Qxb5
13   +4.38   00:00   10984  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb7 f5 Kg3 Kf8 Kf4 Re7 Qxb5 Kf7 Ke5
14   +4.31   00:00   18496  Rc8+ Rd8 Qc7 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb7 f6 Qd7 Kf8 Qxb5 Rd8 Qb6 Ke7 Qc7+ Rd7
15   +4.25   00:00   30194  Rc8+ Rd8 Qc7 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb7 f6 Kg3 Kf8 Kf3 Re7 Qxb5 Kf7 Qh5+ Kg8 Qc5 Kf7 Ke4 g5
16   +4.25   00:00   30944  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb7 f6 Kg3 Kf8 Qxb5 Re7 f4 Kf7 Qh5+ Kg8 Kf2
17   +4.28   00:00  101848  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Rf8 Qb7 g6 Kg3 h5 Qxb5 Rd8 Kf3 Rd5 Qb2 Kf8 Qb4+ Kg7
18   +4.30   00:00  110422  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Kg3 h5 Qb7 g6 Qxb5 Rd8 Kf3 Rd5 Qb2 Rg5 g4 Rd5 Qc3 Kf8 Qb4+ Kg7
19   +4.34   00:00  114366  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Kg3 h5 Qb7 g6 Qxb5 Rd8 Qb2 Kf8 Qb4+ Kg7 Qc3+ Kf8 Kf3 Rd5 Ke3 Rg5 Qb4+ Ke8
20   +4.36   00:00  189995  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb7 g6 Qxb5 Rd8 Kg3 h5 Kf3 Rd5 Qb8+ Kh7 Qf8 Rf5+ Ke3 g5 f3 Re5+ Kf2 Rf5 g4 hxg4
21   +4.40   00:00  249804  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb7 g6 Qxb5 Rd8 Kg3 h5 Kf3 Rd5 Qb8+ Kh7 h4 g5 hxg5 Rxg5 Qb2 Kg6 Qh8 Rd5 Ke3
22   +4.43   00:00  319116  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb7 g6 Qxb5 Rd8 Kg3 h5 h4 Rd5 Qb8+ Kg7 Qb2+ Kg8 Kf3 Kf8 Ke3 Rd1 Qb4+ Kg7 Qb3 Rd5 Qb2+ Kf8 Kf3 Ke8
23   +4.43   00:00  429637  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb7 g6 Qxb5 Rd8 Kg3 h5 h4 Rd5 Qb8+ Kg7 Qb2+ Kg8 Kf3 Kf8 Ke3 Rd1 Qb8+ Ke7 Qb4+ Kf6 Ke4 Rh1 Qd4+ Ke7 Ke3 Rb1
24   +4.43   00:00  586739  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb7 g6 Qxb5 Rd8 Kg3 h5 h4 Rd5 Qb8+ Kg7 Qb2+ Kg8 Kf4 Kf8 Ke3 Rd1 Qb8+ Ke7 Qb4+ Kf6 Ke4 Rh1 Qd4+ Ke7 Ke3 Rb1
25   +4.50   00:01  940628  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Kg3 h6 Qb6 Ra8 h4 g6 Qxb5 Rd8 Kf3 Rd5 Qb8+ Kg7 Ke3 h5 Qb2+ Kh7 f3 Kg8 Kf2 Rd8
26   +4.58   00:01   1417K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb7 Rd8 Qb6 Ra8 Qxb5 Rd8 Qb6 Re8 Kg3 f6 Kf3 Kf7 g4 Re7 h4 h6 Qb5 Kf8 Kg3 Kf7 Qh5+ Kg8
27   +4.61   00:02   1651K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb7 Rd8 Qb6 Re8 Qxb5 Rd8 g4 h6 h4 g6 Kg3 Rd5 Qb8+ Kg7 Qb2+ Kh7 f3 Kg8 Qb8+ Kg7 Qb4 h5 g5 Rd8 Kf4 Kg8
28   +4.69   00:03   2383K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb7 g6 g4 Rd8 Qxb5 Rd5 Qb8+ Kg7 Qb2+ Kg8 h4 h6 Kg3 Rd8 Qb5 Kf8 Qb4+ Kg8 Qb2 Rd3+ f3 Rd5 Qb8+ Kg7 Qb4 Kg8 Qb2 Kh7 Kf2
29   +4.62   00:03   2954K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Rf8 Qb6 g6 g4 h6 Qxb5 Rd8 Kg3 Rd5 Qb8+ Kg7 Qb2+ Kg8 h4 Rd3+ f3 Rd5 Kf4 h5 Ke4 Kh7 Qb4 Kg8 Kf4 Kg7 Qc3+ Kh7 Ke3 Rb5 Ke4 Kg8
30   +4.62   00:04   3108K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Rf8 g4 g6 Qb6 h6 Qxb5 Rd8 Kg3 Rd5 Qb8+ Kg7 Qb2+ Kg8 h4 Rd3+ f3 Rd5 Kf4 h5 Ke4 Kh7 Qb4 Kg8 Kf4 Kg7 Qc3+ Kg8 Ke3 Rd1 gxh5 gxh5
31   +4.76   00:04   3676K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Rc8 Qb7 Rd8 Qb6 Ra8 Qxb5 g6 g4 Rd8 g5 Rd5 Qb8+ Kg7 Qb2+ Kg8 h4 Rd3 Qb5 Rd5 Qb8+ Kg7 Qb2+ Kg8 Kg3 Rd1 Qb4 Rd5 f3 Rd1 Qb8+ Kg7
32   +4.76   00:04   3757K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Rc8 Qb7 Rd8 Qb6 Ra8 Qxb5 g6 g4 Rd8 g5 Rd5 Qb8+ Kg7 Qb2+ Kg8 h4 Rd3 Qb5 Rd5 Qb8+ Kg7 Qb2+ Kg8 Kg3 Rd1 Qb4 Rd5 f3 Rd1 Qb8+ Kg7 Qb2+ Kg8 Qb3 Rd8
33   +4.76   00:05   4032K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Rc8 Qb7 Rd8 Qb6 Ra8 Qxb5 g6 g4 Rd8 g5 Rd5 Qb8+ Kg7 Qb2+ Kg8 h4 Rd3 Qb5 Rd5 Qb8+ Kg7 Qb2+ Kg8 Kg3 Rd1 Qb4 Rd5 f3 Rd1 Qb8+ Kg7 Qb2+ Kg8 Qb3
34   +4.76   00:05   4220K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Rc8 Qb7 Rd8 Qb6 Ra8 Qxb5 g6 g4 Rd8 g5 Rd5 Qb8+ Kg7 Qb2+ Kg8 h4 Rd3 Qb5 Rd5 Qb8+ Kg7 Qb2+ Kg8 Kg3 Rd1 Qb4 Rd5 f3 Rd8 Qb2 Rd3 Qe5 Rd1 Qb8+ Kg7
35   +4.76   00:06   4578K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Rc8 Qb7 Rd8 Qb6 Ra8 Qxb5 g6 g4 Rd8 g5 Rd5 Qb8+ Kg7 Qb2+ Kg8 h4 Rd3 Qb5 Rd5 Qb8+ Kg7 Qb2+ Kg8 Kg3 Rd1 Qb4 Rd5 f3 Rd8 Qb5 Rd1 Qb2 Rd8 Kf4 Rd3
36   +4.76   00:07   5542K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Rc8 Qb7 Rd8 Qb6 Ra8 Qxb5 g6 g4 Rd8 g5 Rd5 Qb8+ Kg7 Qb2+ Kg8 h4 Rd3 Qb5 Rd5 Qb8+ Kg7 Qb2+ Kg8 Kg3 Rd1 Qb4 Rd5 f3 Rd8 Kf4 Rd3 Qb2 Rd8 Kg3 Rd5 Qb3
37   +4.76   00:07   5835K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Rc8 Qb7 Rd8 Qb6 Ra8 Qxb5 g6 g4 Rd8 g5 Rd5 Qb8+ Kg7 Qb2+ Kg8 h4 Rd3 Qb5 Rd5 Qb8+ Kg7 Qb2+ Kg8 Kg3 Rd1 Qb4 Rd5 f3 Rd8 Kf4 Rd3 Qb2 Rd8 Kg3 Rd5 Qb3 Kf8 Qb4+ Kg8 Qb8+ Kg7 Qe8
38   +4.76   00:09   7172K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Rc8 Qb7 Rd8 Qb6 Ra8 Qxb5 g6 g4 Rd8 g5 Rd5 Qb8+ Kg7 Qb2+ Kg8 h4 Rd3 Qb5 Rd5 Qb8+ Kg7 Qb2+ Kg8 Kg3 Rd1 Qb4 Rd5 f3 Rd8 Kf4 Rd3 Qb8+ Kg7 Qb2+ Kg8 Kg3 Rd8 Qb5 Rd1 Qb8+ Kg7 Qe5+ Kg8
39   +4.76   00:09   7535K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Rc8 Qb7 Rd8 Qb6 Ra8 Qxb5 g6 g4 Rd8 g5 Rd5 Qb8+ Kg7 Qb2+ Kg8 h4 Rd3 Qb5 Rd5 Qb8+ Kg7 Kg3 Rd3+ Kg2 Rd5 Qb2+ Kg8 Kg3 Rd1 Qb4 Rd5 Qb8+ Kg7 Qb2+ Kg8 Kf3 Rd3+ Kg4 Rd8 Qe5 Rd5 Qc7 Rd4+ Kg3
40   +4.76   00:11   9206K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Rc8 Qb7 Rd8 Qb6 Ra8 Qxb5 g6 g4 Rd8 g5 Rd5 Qb8+ Kg7 Qb2+ Kg8 h4 Rd3 Qb5 Rd5 Qb8+ Kg7 Kg3 Rd3+ Kg2 Rd5 Qb2+ Kg8 Kg3 Rd1 Qb4 Rd5 Qb8+ Kg7 Qb2+ Kg8 Kf3 Rd3+ Kg4 Rd8 Qb5 Rd5 Qb8+ Kg7 Qb2+ Kg8
41   +5.66   00:55  45366K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb6 f5 Qxb5 Re7 Qb8+ Kf7 g4 fxg4 Qf4+ Ke8 Qxg4 Kf8 Kg3 Kf7 h4 Kg8 Qe4 Re8 Qb7 Kf8 Qb1 Kg8 Qe4 Re7 Qa8+ Kf7 Qh8 h6 Qd8 Rb7 Qd3 Ra7 Qf3+ Ke8 Qe4 Kf7 Qf4+ Kg6 h5+ Kh7 Qe4+ Kh8
42   +5.66   01:03  51754K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb6 g6 g4 b4 h4 Kg7 Qd4+ e5 Qxb4 h6 Qd6 Re6 Qd8 Ra6 Qd5 Re6 g5 h5 Qc5 Kg8 Kg3 Re8 Qb5 Re7 Qb8+ Kg7 Qd8 Re6 Qd7 Kg8 Qc8+ Kg7 Qd8 Rc6 Qd5 Re6 Kf3 Re7 Qd6 Re8 Qd7 Kf8 Qb5
43   +5.66   01:09  57292K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb6 g6 g4 b4 h4 Kg7 Qd4+ e5 Qxb4 h6 Qd6 Re6 Qd8 Ra6 Qd5 Re6 g5 h5 Qc5 Kg8 Kg3 Re8 Qb5 Re7 Qb8+ Kg7 Qd8 Re6 Qd7 Kg8 Qc8+ Kg7 Qd8 Rc6 Qd5 Re6 Kf3 Re7 Qd6 Re8 Kg3 Kg8 Qd5 Kf8 Qb5
44   +5.66   01:12  59093K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb6 g6 g4 b4 h4 Kg7 Qd4+ e5 Qxb4 h6 Qd6 Re6 Qd8 Ra6 Qd5 Re6 g5 h5 Qc5 Kg8 Kg3 Re8 Qb5 Re7 Qb8+ Kg7 Qd8 Re6 Qd7 Kg8 Qc8+ Kg7 Qd8 Rc6 Qd5 Re6 Kf3 Re7 Qd6 Re8 Ke4 Kg8 Qd5 Kf8 Qc5+ Kg8
45   +5.66   01:17  63709K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb6 g6 g4 b4 h4 Kg7 Qd4+ e5 Qxb4 h6 Qd6 Re6 Qd8 Ra6 Qd5 Re6 g5 h5 Qc5 Kg8 Kg3 Re8 Qb5 Re7 Qb8+ Kg7 Qd8 Re6 Qd7 Kg8 Qc8+ Kg7 Qd8 Rc6 Qd5 Re6 Kf3 Re7 Qd6 Re8 Ke4 Kg8 Qd5 Kf8 Qc5+ Kg8 Qb5
46   +5.73   01:42  83429K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb6 g6 g4 b4 h4 Kg7 Qd4+ e5 Qb6 h6 g5 Re6 Qc5 h5 Qxb4 Re8 Qc5 Re6 Kg3 Re8 Kf3 Kg8 Ke4 Kg7 Qd6 Kg8 Qd5 Kg7 Qc6 Kf8 Qd7 Re7 Qc8+ Kg7 Qc6 Kg8 Kf3 Kh7 Qc5 Re8 Qb5 Re7 Kg3 e4 Kf4
47   +5.73   01:43  84343K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb6 g6 g4 b4 h4 Kg7 Qd4+ e5 Qb6 h6 g5 Re6 Qc5 h5 Qxb4 Re8 Qc5 Re6 Kg3 Re8 Kf3 Kg8 Ke4 Kg7 Qd6 Kg8 Qd5 Kg7 Qc6 Kf8 Qd7 Re7 Qc8+ Kg7 Qc6 Kg8 Kf3 Kh7 Qc5 Re8 Qb5 Re7 Kg3 e4 Kf4 Re6
48   +6.14   04:32 224028K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rd8 Qb6 Rc8 Qxb5 g6 Qb6 Re8 g4 e5 Qb5 Kf8 Qb4+ Kg7 h4 h6 Qd6 Re6 Qd8 Ra6 Qd5 Re6 Kg3 Re7 Qc6 Kg8 Qc5 Re8 Qd5 Kg7 Qc6 Kf8 Qb5 Re6 Qd7 Re8 Qc6 e4 Qd6+ Kg7 Kf4 Kg8 Qd7 Kf8 Qd4 Kg8 Qf6
49   +6.37   07:31 377653K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb6 b4 g4 b3 Qxb3 h6 Qb5 Kf8 Qc5+ Kg8 Qb4 e5 Qb5 Re6 Qb8+ Kh7 Qb7 Kg8 Qc8+ Kh7 h4 e4 Qc4 Kg8 Qd5 Kh7 Qd4 Kg8 Qd8+ Kh7 Qd5 Kg8 Kg3 Kh7 Qb7 Kg8 Kf4 Kf8 Qc8+ Ke7 Qc5+ Ke8 Kg3 e3 Qc8+ Ke7 Qb7+ Kf8 Qa8+ Ke7 Qa3+ Ke8 fxe3 Rg6 Qc5 Re6 Qc8+ Ke7 Qb7+ Kf8 Qb4+ Ke8 Qb8+ Ke7 Qa7+ Ke8
50   +6.37   07:43 387880K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb6 b4 g4 b3 Qxb3 h6 Qb5 Kf8 Qc5+ Kg8 Qb4 e5 h4 e4 Qb5 Re6 Qd5 Kh7 Qd4 Kg8 Qd8+ Kh7 Qd5 Kg8 Kg3 Kh7 Qb7 Kg8 Kf4 Kf8 Qc8+ Ke7 Qc5+ Ke8 Kg3 e3 Qc8+ Ke7 Qb7+ Kf8 Qa8+ Ke7 Qa3+ Ke8 fxe3 Rg6 Qc5 Re6 Qc8+ Ke7 Qc3 Rg6 Qe5+ Kf8 Qc5+ Ke8 Kh2 Rf6 Qd4 Rg6 Qe5+ Kd7
51   +6.37   08:07 408465K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb6 b4 g4 b3 Qxb3 h6 Qb5 Kf8 Qc5+ Kg8 Qb4 e5 h4 e4 Qb5 Re6 Qd5 Kh7 Qd4 Kg8 Qd8+ Kh7 Qd5 Kg8 Kg3 Kh7 Qb7 Kg8 Kf4 Kf8 Qc8+ Ke7 Qc5+ Ke8 Kg3 e3 Qc8+ Ke7 Qb7+ Kf8 Qa8+ Ke7 Qa3+ Ke8 fxe3 Rg6 Qc5 Re6 Qc8+ Ke7 Qc3 Rg6 Qc5+ Ke8 Kh2 Rf6 Qb4 Re6 Qb7 Rf6
52   +6.40   09:31 481530K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb6 b4 g4 b3 Qxb3 h6 Qb5 Kf8 Qc5+ Kg8 Qb4 e5 h4 e4 Qb5 Re6 Qd5 Kh7 Qd4 Kg8 Qd8+ Kh7 Qd5 Kg8 Kg3 Kh7 Qb7 Kg8 Kf4 Kf8 Qc8+ Re8 Qc5+ Kg8 Qd5 Re6 Qa8+ Kh7 g5 hxg5+ hxg5 e3 Qh1+ Kg8 fxe3 Ra6 Qd5 g6 Qc5 Ra8 Qc6 Ra2 Ke5 Ra5+ Qd5 Ra3 Qd8+ Kg7 Qf6+ Kg8 Qb6
53   +6.40   10:37 539391K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb6 b4 g4 b3 Qxb3 h6 Qb5 Kf8 Qc5+ Kg8 Qb4 e5 h4 e4 Qb5 Re6 Qd5 Kf8 Qd4 Kg8 Qd8+ Kh7 Qd5 Kg8 Kg3 Kh7 Qb7 Kg8 Kf4 e3 Qb8+ Kh7 fxe3 Rf6+ Kg3 Re6 Qa7 Kg8 Qd4 Re8 Qd3 Re5 Qd8+ Kh7 Kf4 Rc5 Qe8 Rc1 Kf3 Rf1+ Ke2 Rf6 Qd7 Kg8 g5 Rg6 Qe8+ Kh7
54   +6.40   11:00 559790K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb6 b4 g4 b3 Qxb3 h6 Qb5 Kf8 Qc5+ Kg8 Qb4 e5 h4 e4 Qb5 Re6 Qd5 Kf8 Qd4 Kg8 Qd8+ Kh7 Qd5 Kg8 Kg3 Kh7 Qb7 Kg8 Kf4 e3 Qb8+ Kh7 fxe3 Rf6+ Kg3 Re6 Qa7 Kg8 Qd4 Re8 Qd3 Ra8 Qc3 Rf8 Qc6 Kh7 Kf4 f6 Qe4+ Kg8 Kg3 Rd8 Qc4+ Kh8 Qc6 Rb8 Qd5
55   +6.40   11:03 563019K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb6 b4 g4 b3 Qxb3 h6 Qb5 Kf8 Qc5+ Kg8 Qb4 e5 h4 e4 Qb5 Re6 Qd5 Kf8 Qd4 Kg8 Qd8+ Kh7 Qd5 Kg8 Kg3 Kh7 Qb7 Kg8 Kf4 e3 Qb8+ Kh7 fxe3 Rf6+ Kg3 Re6 Qa7 Kg8 Qd4 Re8 Qd3 Ra8 Qc3 Rf8 Qc6 Kh7 Kf4 f6 Qe4+ Kg8 Kg3 Rd8 Qc6 Kh7 Kf4 Rb8
56   +6.40   11:07 566929K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb6 b4 g4 b3 Qxb3 h6 Qb5 Kf8 Qc5+ Kg8 Qb4 e5 h4 e4 Qb5 Re6 Qd5 Kf8 Qd4 Kg8 Qd8+ Kh7 Qd5 Kg8 Kg3 Kh7 Qb7 Kg8 Kf4 e3 Qb8+ Kh7 fxe3 Rf6+ Kg3 Re6 Qa7 Kg8 Qd4 Re8 Qd3 Ra8 Qc3 Rf8 Qc6 Kh7 Kf4 f6 Qe4+ Kg8 Kg3 Rd8 Qc6 Kh7 Qc7 Rd5 Qc2+ Kh8
57   +6.40   11:39 595288K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb6 b4 g4 b3 Qxb3 h6 Qb5 Kf8 Qc5+ Kg8 Qb4 e5 h4 e4 Qb5 Re6 Qd5 Kf8 Qd4 Kg8 Qd8+ Kh7 Qd5 Kg8 Kg3 Kh7 Qb7 Kg8 Kf4 e3 Qb8+ Kh7 fxe3 Rf6+ Kg3 Re6 Qa7 Kg8 Qd4 Re8 Qd3 Ra8 Qc3 Re8 Kf4 Kf8 Qc6 Re6 Qc5+ Ke8 Qd4 Rg6 Kg3 Ke7 Qb4+ Ke8 Qb8+ Ke7 Qg8 h5
58   +6.40   11:44 598878K  Rc8+ Rd8 Qc7 Rf8 Qb8 Qd6+ Qxd6 Rxc8 Qxa6 Rb8 Qa7 Re8 Qb6 b4 g4 b3 Qxb3 h6 Qb5 Kf8 Qc5+ Kg8 Qb4 e5 h4 e4 Qb5 Re6 Qd5 Kf8 Qd4 Kg8 Qd8+ Kh7 Qd5 Kg8 Kg3 Kh7 Qb7 Kg8 Kf4 e3 Qb8+ Kh7 fxe3 Rf6+ Kg3 Re6 Qa7 Kg8 Qd4 Re8 Qd3 Ra8 Qc3 Re8 Kf4 Kf8 Qc6 Re6 Qc5+ Ke8 Qd4 Rg6 Kg3 Ke7 Qa7+ Ke8 Qc5 Rf6 Qb5+ Kd8 Qe5
59   +6.81   30:00   1572M  Rc8+
Nodes: 1572377207
Nodes/second: 873537
Best move: Rc8+
Ponder move: Rd8
Parent - By irulats (****) [gb] Date 2017-06-03 16:18
Thank you. I might try letting it run for a few days next week on a 4 CPU machine. I haven't enough chess knowledge to call it for sure but I think black can make a fortress behind pawns on the light squares.
Parent - - By Dadi Jonsson (Silver) [is] Date 2017-06-04 20:50
White has a winning position. Black cannot set up a fortress. As white you can follow Dann's line. Black may choose a different 6th move, but of course the rook cannot leave the 8th rank. After that you advance the white kingside pawns (h & g).

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[FEN "6k1/5ppp/p1R1p3/1p1r4/8/2Q4P/5PPK/3q4 w - - 0 1"]
[SetUp "1"]

1. Rc8+ Rd8 2. Qc7 Rf8 3. Qb8 Qd6+ 4. Qxd6 Rxc8 5. Qxa6 Rb8 6. Qa7 Re8 7. g4 *

Here is the result of my IDeA analysis. I started with Dann's line and then had a Tree Generation Strategy follow that line to find improvements. After I saw that the lines were relatively forced I switched to using a single multi-core IDeA engine to get a more reliable analysis of the leaf nodes. The resulting IDeA score can bee seen below.
Parent - - By irulats (****) [gb] Date 2017-06-04 21:10
Thanks Dadi. I see your engine manage to get a winning line in IDeA. However, black could play 7...g6 now and allow his rook to go to the d file. He could use d5, f5 and give spite checks to the white king if he comes forward. The black king now has g7. So could you put me out of my misery and give me a look at the IDeA analysis after this position, please?

1. Rc8 Rd8 2. Qc7 Rf8 3. Qb8 Qd6 4. Qxd6 Rxc8 5. Qxa6 Rb8 6. Qa7 Re8 7. g4 g6

4r1k1/Q4p1p/4p1p1/1p6/6P1/7P/5P1K/8 w - - 0 8
Parent - - By irulats (****) [gb] Date 2017-06-04 21:48
Actually. 8. Qb6 does the trick for white and I underestimated the power of the pawn on g4 with h4 & h5 coming. Looks like IDeA is better for solving these than IA and poor chess ability :lol:

Thanks again for your efforts.
Parent - By Dadi Jonsson (Silver) [is] Date 2017-06-04 21:58
Yes, 8.Qb6 prevents Re8-d8-d5 and white just keeps pushing the pawns.
Up Topic The Rybka Lounge / Test Positions / Is there a win for white here?

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