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Up Topic The Rybka Lounge / Test Positions / If you like to solve mate in 8 (Would Leonid approve?)
- - By user923005 (****) [us] Date 2016-01-29 21:25
How long until your favorite engine or solver resolves this position to mate in 8?

Q2QQQQQ/Q7/Q1bpqnn1/Q1b3r1/q2qR3/r3N3/p1pqBBRK/2k1N1r1 b - - acd 17; bm Q2xe3; ce 32752; dm 8; id "Leonid.xxx"; pm Q2xe3;
pv Q2xe3 Bxe3+ Qxe3 Qd2+ Qxd2 Nd3+ Rxd3 Rxg1+ Rxg1 Qxd3 Qf4+ Rxf4 Qxf4+ Qg3 Qxg3+;
Parent - - By Peter Grayson (****) [gb] Date 2016-01-30 02:15
Stockfish 200116 POPCNT finds it quite quickly ...

Q2QQQQQ/Q7/Q1bpqnn1/Q1b3r1/q2qR3/r3N3/p1pqBBRK/2k1N1r1 b - - 0 1


Analysis by Stockfish 200116 64 POPCNT: 16 cores, 32 Gb hash  2 x E5-2687w

1...R5xg2+
  +-  (32.45 ++)   Depth: 7/9   00:00:07  9164kN
1...R5xg2+
  +-  (32.38 ++)   Depth: 7/9   00:00:07  9202kN
1...Qaxa5
  +-  (32.27 ++)   Depth: 7/10   00:00:08  11446kN
1...Qdxa5 2.Qgxe6 R5xg2+ 3.N1xg2 Qxd8 4.Qxa4 Rxg2+ 5.Kxg2
  +-  (32.30)   Depth: 7/10   00:00:10  17146kN
1...Qdxa5
  +-  (32.23 ++)   Depth: 8/10   00:00:12  24111kN
1...R1xg2+
  +-  (32.14 ++)   Depth: 8/10   00:00:15  39222kN
1...R1xg2+
  +-  (32.03 ++)   Depth: 8/10   00:00:15  39246kN
1...R1xg2+
  +-  (31.88 ++)   Depth: 8/10   00:00:15  39251kN
1...R1xg2+
  +-  (31.42 ++)   Depth: 8/10   00:00:15  39255kN
1...R1xg2+
  +-  (31.14 ++)   Depth: 8/10   00:00:15  39333kN
1...R1xg2+
  +-  (30.77 ++)   Depth: 8/10   00:00:15  39342kN
1...R1xg2+
  +-  (30.31 ++)   Depth: 8/10   00:00:15  39370kN
1...R1xg2+ 2.N1xg2 Rxg2+ 3.Nxg2 Qde5+ 4.Kg1 a1Q 5.Qgxe6 Kb2+ 6.Ne1 Qdg5+ 7.Kf1 Qxa5 8.Qaxa5 Bxe8
  +-  (30.52)   Depth: 8/10   00:00:15  39389kN
1...R1xg2+
  +-  (30.45 ++)   Depth: 9/15   00:00:16  56667kN
1...R1xg2+
  +-  (30.38 ++)   Depth: 9/15   00:00:16  67774kN
1...R1xg2+
  +-  (30.28 ++)   Depth: 9/15   00:00:17  72896kN
1...R1xg2+
  +-  (30.13 ++)   Depth: 9/15   00:00:17  74233kN
1...R1xg2+
  +-  (29.93 ++)   Depth: 9/15   00:00:17  75040kN
1...R1xg2+
  +-  (29.66 ++)   Depth: 9/15   00:00:17  75762kN
1...R1xg2+
  +-  (29.30 ++)   Depth: 9/15   00:00:17  78648kN
1...R1xg2+
  +-  (28.84 ++)   Depth: 9/15   00:00:17  81809kN
1...R1xg2+
  +-  (28.24 ++)   Depth: 9/15   00:00:17  82676kN
1...R1xg2+ 2.N1xg2
  +-  (28.72 --)   Depth: 9/15   00:00:17  85352kN
1...R1xg2+
  +-  (28.09 ++)   Depth: 9/17   00:00:17  90226kN
1...R1xg2+
  +-  (26.85 ++)   Depth: 9/17   00:00:18  91633kN
1...R5xg2+
  +-  (25.28 ++)   Depth: 9/17   00:00:18  104MN
1...R5xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+ 4.Qe1 Rxf2 5.Bxd1 cxd1Q 6.Qxc5+ Qxc5 7.Qxd1+ Qxd1+ 8.Nxd1 Bxe4+ 9.Qxe4 Nxe4
  +-  (24.05)   Depth: 9/17   00:00:19  112MN
1...R5xg2+
  +-  (23.98 ++)   Depth: 10/17   00:00:19  117MN
1...R5xg2+ 2.N1xg2
  +-  (24.15 --)   Depth: 10/17   00:00:19  118MN
1...R5xg2+ 2.N1xg2
  +-  (24.27 --)   Depth: 10/18   00:00:19  119MN
1...R5xg2+ 2.N1xg2
  +-  (24.42 --)   Depth: 10/18   00:00:19  125MN
1...R5xg2+
  +-  (24.27 ++)   Depth: 10/18   00:00:19  126MN
1...R5xg2+
  +-  (23.98 ++)   Depth: 10/18   00:00:19  126MN
1...R5xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+ 4.Bxd1 cxd1Q+ 5.Be1 Nxe4 6.Q6xc6 Qxa5 7.Qaxa5 Rxa5 8.Qaxa5
  +-  (23.73)   Depth: 10/18   00:00:19  127MN
1...R5xg2+
  +-  (23.66 ++)   Depth: 11/21   00:00:21  155MN
1...R5xg2+
  +-  (23.59 ++)   Depth: 11/21   00:00:21  155MN
1...R5xg2+
  +-  (23.48 ++)   Depth: 11/21   00:00:21  155MN
1...R5xg2+
  +-  (23.34 ++)   Depth: 11/21   00:00:21  155MN
1...R5xg2+
  +-  (23.13 ++)   Depth: 11/21   00:00:21  155MN
1...R5xg2+
  +-  (22.86 ++)   Depth: 11/21   00:00:21  161MN
1...R5xg2+
  +-  (22.51 ++)   Depth: 11/21   00:00:21  165MN
1...R5xg2+
  +-  (22.04 ++)   Depth: 11/21   00:00:21  167MN
1...R1xg2+
  +-  (21.44 ++)   Depth: 11/21   00:00:23  195MN
1...R1xg2+ 2.N1xg2
  +-  (21.93 --)   Depth: 11/21   00:00:23  197MN
1...R1xg2+
  +-  (21.30 ++)   Depth: 11/21   00:00:24  228MN
1...R1xg2+
  +-  (20.06 ++)   Depth: 11/21   00:00:24  228MN
1...R1xg2+
  +-  (18.49 ++)   Depth: 11/21   00:00:24  233MN
1...R1xg2+ 2.N1xg2
  +-  (20.14 --)   Depth: 11/21   00:00:25  240MN
1...R5xg2+
  +-  (18.14 ++)   Depth: 11/21   00:00:25  242MN
1...R5xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+ 4.Bf1 Qexe4 5.Qxe4 Qxe4 6.Qfh6 Rxf2+ 7.Ng2+ Be3 8.Qaxe3+ Rxe3 9.Qhxf6 Rxf6
  +-  (17.77)   Depth: 11/21   00:00:25  243MN
1...R5xg2+
  +-  (17.70 ++)   Depth: 12/21   00:00:25  251MN
1...R5xg2+
  +-  (17.63 ++)   Depth: 12/21   00:00:25  251MN
1...R5xg2+
  +-  (17.52 ++)   Depth: 12/21   00:00:25  253MN
1...R5xg2+
  +-  (17.37 ++)   Depth: 12/21   00:00:25  253MN
1...R5xg2+
  +-  (17.17 ++)   Depth: 12/21   00:00:26  254MN
1...R5xg2+
  +-  (16.90 ++)   Depth: 12/21   00:00:26  254MN
1...R5xg2+
  +-  (16.54 ++)   Depth: 12/21   00:00:26  255MN
1...R5xg2+
  +-  (16.08 ++)   Depth: 12/21   00:00:26  257MN
1...R5xg2+
  +-  (15.48 ++)   Depth: 12/21   00:00:26  259MN
1...R5xg2+
  +-  (14.71 ++)   Depth: 12/23   00:00:26  264MN
1...R1xg2+
  +-  (13.73 ++)   Depth: 12/23   00:00:27  281MN
1...R1xg2+
  +-  (12.49 ++)   Depth: 12/26   00:00:27  285MN
1...R5xg2+
  +-  (5.46 ++)   Depth: 12/26   00:00:28  310MN
1...R5xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+ 4.Bf1 Qexe4 5.Qxe4 Qxe4 6.Qdxf6 Rxf2+ 7.Qf3 Qdxf3+ 8.Qxf3 Qxf3+ 9.Kg1 Qag4+ 10.Ng2 Rxg2+ 11.Kh1 Nxh8
  +-  (4.34)   Depth: 12/26   00:00:28  313MN
1...R5xg2+
  +-  (4.27 ++)   Depth: 13/26   00:00:29  314MN
1...R5xg2+
  +-  (4.19 ++)   Depth: 13/26   00:00:29  315MN
1...R5xg2+
  +-  (4.08 ++)   Depth: 13/26   00:00:29  315MN
1...R5xg2+
  +-  (3.93 ++)   Depth: 13/26   00:00:29  315MN
1...R5xg2+
  +-  (3.73 ++)   Depth: 13/26   00:00:29  315MN
1...R5xg2+
  +-  (3.46 ++)   Depth: 13/26   00:00:29  316MN
1...R5xg2+
  +-  (3.10 ++)   Depth: 13/26   00:00:29  316MN
1...R5xg2+
  +-  (2.64 ++)   Depth: 13/26   00:00:29  318MN
1...R5xg2+ 2.N1xg2
  +-  (3.01 --)   Depth: 13/26   00:00:29  322MN
1...R5xg2+
  +-  (2.51 ++)   Depth: 13/26   00:00:29  322MN
1...R5xg2+
  +/-  (1.53 ++)   Depth: 13/26   00:00:29  322MN
1...R5xg2+
  =  (0.29 ++)   Depth: 13/26   00:00:29  326MN
1...R5xg2+
  -/+  (-1.27 ++)   Depth: 13/26   00:00:29  328MN
1...R5xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+ 4.Bf1 Qexe4 5.Qd2+ Q1xd2 6.Qxe4 Qxe4 7.Qe2 Rxf2+ 8.Ng2 Nxh8 9.Qxd2+ Rxd2 10.Qxh8 Bxa7
  -+  (-2.75)   Depth: 13/26   00:00:29  330MN
1...R5xg2+
  -+  (-2.82 ++)   Depth: 14/26   00:00:29  331MN
1...R5xg2+
  -+  (-2.89 ++)   Depth: 14/26   00:00:29  331MN
1...R5xg2+
  -+  (-3.00 ++)   Depth: 14/26   00:00:29  331MN
1...R5xg2+
  -+  (-3.15 ++)   Depth: 14/26   00:00:29  331MN
1...R5xg2+
  -+  (-3.36 ++)   Depth: 14/26   00:00:29  331MN
1...R5xg2+
  -+  (-3.63 ++)   Depth: 14/26   00:00:29  331MN
1...R5xg2+
  -+  (-7.18 ++)   Depth: 14/26   00:00:29  331MN
1...R5xg2+
  -+  (-7.82 ++)   Depth: 14/26   00:00:29  331MN
1...R5xg2+
  -+  (-8.43 ++)   Depth: 14/26   00:00:29  332MN
1...R5xg2+
  -+  (-9.33 ++)   Depth: 14/26   00:00:29  332MN
1...R5xg2+
  -+  (-10.88 ++)   Depth: 14/26   00:00:29  332MN
1...R5xg2+
  -+  (-12.16 ++)   Depth: 14/26   00:00:29  332MN
1...R5xg2+
  -+  (-14.41 ++)   Depth: 14/26   00:00:29  332MN
1...R5xg2+
  -+  (-16.39 ++)   Depth: 14/26   00:00:29  332MN
1...R5xg2+
  -+  (-21.31 ++)   Depth: 14/26   00:00:29  332MN
1...R5xg2+
  -+  (-24.67 ++)   Depth: 14/26   00:00:29  332MN
1...R5xg2+ 2.N1xg2
  -+  (-20.41 --)   Depth: 14/26   00:00:30  337MN
1...R5xg2+
  -+  (-24.56 ++)   Depth: 14/36   00:00:30  347MN
1...R5xg2+
  -+  (-#17 ++)   Depth: 14/36   00:00:30  347MN
1...R5xg2+ 2.N1xg2
  -+  (-8.65 --)   Depth: 14/36   00:00:31  375MN
1...R5xg2+
  -+  (-#15 ++)   Depth: 14/36   00:00:31  375MN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qxd3 Qf4+ 7.Rxf4 Qxf4+ 8.Qg3 Qxg3#
  -+  (-#8)   Depth: 14/36   00:01:28  1642MN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qxd3 Qf4+ 7.Rxf4 Qxf4+ 8.Qg3 Qxg3#
  -+  (-#8)   Depth: 15/36   00:01:28  1643MN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qxd3 Qf4+ 7.Rxf4 Qxf4+ 8.Qg3 Qxg3#
  -+  (-#8)   Depth: 16/36   00:01:28  1651MN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qxd3 Qf4+ 7.Rxf4 Qxf4+ 8.Qg3 Qxg3#
  -+  (-#8)   Depth: 17/36   00:01:30  1691MN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qxd3 Qf4+ 7.Rxf4 Qxf4+ 8.Qg3 Qxg3#
  -+  (-#8)   Depth: 18/36   00:01:33  1747MN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qxd3 Qf4+ 7.Rxf4 Qxf4+ 8.Qg3 Qxg3#
  -+  (-#8)   Depth: 19/36   00:01:36  1830MN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qxd3 Qf4+ 7.Rxf4 Qxf4+ 8.Qg3 Qxg3#
  -+  (-#8)   Depth: 20/36   00:01:38  1872MN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qxd3 Qf4+ 7.Rxf4 Qxf4+ 8.Qg3 Qxg3#
  -+  (-#8)   Depth: 21/36   00:01:53  2196MN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qxd3 Qf4+ 7.Rxf4 Qxf4+ 8.Qg3 Qxg3#
  -+  (-#8)   Depth: 22/36   00:02:04  2453MN

(Grayson, Newport, South Wales 30.01.2016)
Parent - - By ritm (**) [ru] Date 2016-01-31 03:18
I think my Android device gonna solve it in about 8 hours (stock-7)
Parent - By Peter Grayson (****) [gb] Date 2016-02-02 11:54

> I think my Android device gonna solve it in about 8 hours (stock-7)


The Android device is OK for playing games against the engine but a PC needed for deep analysis and of course performance is usually related to processing speed. On my slower and much older O/C'd Q9550 quad a very impressive solving time from Deep Rybka 4.1 ...

Stockfish 7 64, Q9550 at 3.53GHz, 4Gb hash

1...R5xg2+
  -+  (-77.05 ++)   Depth: 16/33   00:01:53  558MN, tb=1
1...R5xg2+
  -+  (-#18 ++)   Depth: 16/33   00:01:53  558MN, tb=1
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qdxf6 Rh3+ 7.Qxh3 Rh1+ 8.Kxh1 Qxh3#
  -+  (-#8)   Depth: 16/33   00:06:46  2149MN, tb=1
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qdxf6 Rh3+ 7.Qxh3 Rh1+ 8.Kxh1 Qxh3#
  -+  (-#8)   Depth: 17/33   00:06:58  2215MN, tb=1

Deep Rybka 4.1 64, Q9550 3.53 GHz, 4Gb LP hash,
1...R1xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+ 4.Bf1 Rxe3 5.Qc3 Rh3+ 6.Qhxh3 Rg1+ 7.Kh2 Qxf2+ 8.Qg2 Rxg2+ 9.Bxg2 Qdg1#
  -+  (-#9)   Depth: 7   00:01:07  30965kN
1...R1xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+ 4.Bxd1 cxd1Q+ 5.Qe1 Qxe1+ 6.Bxe1 Rg1+ 7.Kh2 Rh1+ 8.Kxh1 Qdxe4+ 9.Kh2 Qh1+ 10.Kg3 Qg1#
  -+  (-#10)   Depth: 8   00:01:24  36072kN
1...R1xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+[] 4.Bxd1 cxd1Q+ 5.Qe1 Qxe1+ 6.Bxe1 Rg1+ 7.Kh2 Rh1+ 8.Kxh1 Qdxe4+ 9.Kh2 Qh1+ 10.Kg3 Qg1#
  -+  (-#10)   Depth: 9   00:01:32  37677kN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qexg6 Qe5+ 7.Qg3 Qxe2+ 8.Rxe2 Rh1#
  -+  (-#8)   Depth: 9   00:01:44  40595kN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qexg6 Qe5+ 7.Qg3 Qxe2+ 8.Rxe2 Rh1#
  -+  (-#8)   Depth: 10   00:01:51  42041kN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qexg6 Qe5+ 7.Qg3 Qxe2+ 8.Rxe2 Rh1#
Parent - By Peter Grayson (****) [gb] Date 2016-01-30 02:31
Deep Rybka 4.1 SSE42 x64 varies to give a faster time, different finish ...

Q2QQQQQ/Q7/Q1bpqnn1/Q1b3r1/q2qR3/r3N3/p1pqBBRK/2k1N1r1 b - - 0 1


Analysis by Deep Rybka 4.1 SSE42 x64: 16 cores, 4 Gb hash, 2x E5-2687w

1...R1xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+ 4.Bf1 Qdxe4 5.Qexc6 Qh4+ 6.Qxh4 Qxh4+ 7.Kxg2 Qeh3+ 8.Kg1 Qh2#
  =  (-0.12 ++)   Depth: 7   00:00:25  30416kN
1...R1xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+ 4.Bf1 Qdxe4 5.Qexc6 Qh4+ 6.Qxh4 Qxh4+ 7.Kxg2 Qeh3+ 8.Kg1 Qh2#
  =  (-0.27 ++)   Depth: 7   00:00:25  30491kN
1...R1xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+ 4.Bf1 Qdxe4 5.Qexc6 Qh4+ 6.Qxh4 Qxh4+ 7.Kxg2 Qeh3+ 8.Kg1 Qh2#
  =/+  (-0.67 ++)   Depth: 7   00:00:25  30606kN
1...R1xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+ 4.Bf1 Qdxe4 5.Qexc6 Qh4+ 6.Qxh4 Qxh4+ 7.Kxg2 Qeh3+ 8.Kg1 Qh2#
  -/+  (-1.47 ++)   Depth: 7   00:00:25  31244kN
1...R1xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+ 4.Bf1 Qdxe4 5.Qexc6 Qh4+ 6.Qxh4 Qxh4+ 7.Kxg2 Qeh3+ 8.Kg1 Qh2#
  -+  (-3.07 ++)   Depth: 7   00:00:25  31265kN
1...R1xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+ 4.Bf1 Qdxe4 5.Qexc6 Qh4+ 6.Qxh4 Qxh4+ 7.Kxg2 Qeh3+ 8.Kg1 Qh2#
  -+  (-6.27 ++)   Depth: 7   00:00:25  31280kN
1...R1xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+ 4.Bf1 Qdxe4 5.Qexc6 Qh4+ 6.Qxh4 Qxh4+ 7.Kxg2 Qeh3+ 8.Kg1 Qh2#
  -+  (-12.67 ++)   Depth: 7   00:00:25  31286kN
1...R1xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+ 4.Bf1 Qdxe4 5.Qexc6 Qh4+ 6.Qxh4 Qxh4+ 7.Kxg2 Qeh3+ 8.Kg1 Qh2#
  -+  (-25.47 ++)   Depth: 7   00:00:25  31288kN
1...R1xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+ 4.Bf1 Qdxe4 5.Qexc6 Qh4+ 6.Qxh4 Qxh4+ 7.Kxg2 Qeh3+ 8.Kg1 Qh2#
  -+  (-51.07 ++)   Depth: 7   00:00:25  31290kN
1...R1xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+ 4.Bf1 Qdxe4 5.Qexc6 Qh4+ 6.Qxh4 Qxh4+ 7.Kxg2 Qeh3+ 8.Kg1 Qh2#
  -+  (-#8)   Depth: 7   00:00:26  31512kN
1...R1xg2+ 2.N1xg2 Rxg2+ 3.Kh1 Qd1+ 4.Bf1 Qdxe4 5.Qd2+ Qxd2 6.Bxg2 Qxg2+ 7.Nxg2 Rh3+ 8.Qxh3 Qxh3+ 9.Kg1 Qxf2#
  -+  (-#9)   Depth: 8   00:00:28  32965kN
1...R1xg2+ 2.N1xg2 Rxg2+ 3.Kxg2 Qdxe4+ 4.Kf1 Qd1+[] 5.Qe1 Rxe3 6.Qexc6 Qxe1+ 7.Bxe1 Q6f5+ 8.Kg1 Rg3+ 9.Kh2 Qh4+ 10.Qxh4 Qxh4#
  -+  (-#10)   Depth: 9   00:00:34  35809kN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qexg6 Qe5+ 7.Qg3 Qxe2+ 8.Rxe2 Rh1#
  -+  (-#8)   Depth: 9   00:00:43  41125kN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qexg6 Qe5+ 7.Qg3 Qxe2+ 8.Rxe2 Rh1#
  -+  (-#8)   Depth: 10   00:00:47  43481kN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qexg6 Qe5+ 7.Qg3 Qxe2+ 8.Rxe2 Rh1#
  -+  (-#8)   Depth: 11   00:00:55  48424kN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qexg6 Qe5+ 7.Qg3 Qxe2+ 8.Rxe2 Rh1#
  -+  (-#8)   Depth: 12   00:01:07  54666kN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qexg6 Qe5+ 7.Qg3 Qxe2+ 8.Rxe2 Rh1#
  -+  (-#8)   Depth: 13   00:01:28  65774kN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2[] 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qexg6 Qe5+ 7.Qg3 Qxe2+ 8.Rxe2 Rh1#
  -+  (-#8)   Depth: 14   00:01:57  80885kN
1...Q2xe3 2.Bxe3+ Qxe3 3.Qd2+ Qxd2[] 4.Nd3+ Rxd3 5.Rxg1+ Rxg1 6.Qexg6 Qe5+ 7.Qg3 Qxe2+ 8.Rxe2 Rh1#
  -+  (-#8)   Depth: 15   00:02:30  97061kN

(Grayson, Newport, South Wales 30.01.2016)
Up Topic The Rybka Lounge / Test Positions / If you like to solve mate in 8 (Would Leonid approve?)

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