Test position: Mate in 6

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zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Test position: Mate in 6

Post by zullil »

[D]5K2/5p2/6P1/8/8/3N4/rp5R/rk6 w - - 0 1

Originally posted here by Herbert L.
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Dann Corbit
Posts: 12542
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: Test position: Mate in 6

Post by Dann Corbit »

zullil wrote:[D]5K2/5p2/6P1/8/8/3N4/rp5R/rk6 w - - 0 1

Originally posted here by Herbert L.
Not much challenge for computers, but quite interesting to try by hand.
5K2/5p2/6P1/8/8/3N4/rp5R/rk6 w - - acn 14323; acs 0; bm Kg7; ce 32756; dm 6; pv Kg7 f6 Kh6 f5 Rg2 f4 Rh2 f3 Rf2 Ra3 Rxb2#;
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zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: Test position: Mate in 6

Post by zullil »

Dann Corbit wrote:
zullil wrote:[D]5K2/5p2/6P1/8/8/3N4/rp5R/rk6 w - - 0 1

Originally posted here by Herbert L.
Not much challenge for computers
Stockfish, Crafty and Spark all fail to solve this ... at least for me.
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User avatar
michiguel
Posts: 6401
Joined: Thu Mar 09, 2006 8:30 pm
Location: Chicago, Illinois, USA

Re: Test position: Mate in 6

Post by michiguel »

zullil wrote:
Dann Corbit wrote:
zullil wrote:[D]5K2/5p2/6P1/8/8/3N4/rp5R/rk6 w - - 0 1

Originally posted here by Herbert L.
Not much challenge for computers
Stockfish, Crafty and Spark all fail to solve this ... at least for me.
Gaviota finds it in 18.4 seconds (2xIntel 2.9 GHz)

This is a nullmove issue. Gaviota does not prune with nullmove (it reduces), so it generally does ok in this type of problems.

Miguel

Code: Select all

setboard 5K2/5p2/6P1/8/8/3N4/rp5R/rk6 w - - 0 1
d
+-----------------+
| . . . . . K . . |
| . . . . . p . . |
| . . . . . . P . |
| . . . . . . . . |    Castling:
| . . . . . . . . |    ep: -
| . . . N . . . . |
| r p . . . . . R |
| r k . . . . . . | [White]
+-----------------+

analyze
********* Starts iterative deepening, thread = 0
set timer to infinite
       320   1:      0.0    -1.35  1.gxf7 Ra8+ 2.Kg7
       381   2       0.0      :-)  1.gxf7
      1408   2:      0.0    +0.10  1.gxf7 Ra8+ 2.Kg7 R1a2 3.f8=Q Rxf8
                                   4.Kxf8
      4829   3:      0.0    +0.14  1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rh1+ Kc2
                                   4.Nb4+ Kb3 5.Nxa2 Kxa2
     33759   4       0.1    +0.14  1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rh1+ Kc2
                                   4.Nb4+ Kb3 5.Nxa2 Kxa2
     58298   4:      0.1    +0.14  1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rh1+ Kc2
                                   4.Nb4+ Kb3 5.Nxa2 Kxa2
     97034   5       0.2    +0.36  1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rh1+ Kc2
                                   4.Nb4+ Kb3 5.Nxa2 Kxa2 6.Rh2
    142276   5:      0.3    +0.36  1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rh1+ Kc2
                                   4.Nb4+ Kb3 5.Nxa2 Kxa2 6.Rh2
    280840   6       0.5    +0.15  1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rh1+ Kc2
                                   4.Nb4+ Kb3 5.Nxa2 Kxa2 6.Rh2 Ra7
    506542   6:      0.8    +0.15  1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rh1+ Kc2
                                   4.Nb4+ Kb3 5.Nxa2 Kxa2 6.Rh2 Ra7
    843423   7       1.3    +0.00  1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rh1+ Kc2
                                   4.Nb4+ Kb3 5.Nxa2 Kxa2 6.Rh2 Ka1 7.Rh1+
                                   b1=Q 8.Rxb1+ Kxb1 9.f8=Q Rxf8 10.Kxf8
   1385962   7:      2.0    +0.00  1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rh1+ Kc2
                                   4.Nb4+ Kb3 5.Nxa2 Kxa2 6.Rh2 Ka1 7.Rh1+
                                   b1=Q 8.Rxb1+ Kxb1 9.f8=Q Rxf8 10.Kxf8
   1940224   8       2.7    +0.00  1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rh1+ Kc2
                                   4.Nb4+ Kb3 5.Nxa2 Kxa2 6.Rh2 Ka1 7.Rh1+
                                   b1=Q 8.Rxb1+ Kxb1 9.f8=Q Rxf8 10.Kxf8
   2777197   8:      3.7    +0.00  1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rh1+ Kc2
                                   4.Nb4+ Kb3 5.Nxa2 Kxa2 6.Rh2 Ka1 7.Rh1+
                                   b1=Q 8.Rxb1+ Kxb1 9.f8=Q Rxf8 10.Kxf8
   4186242   9       5.4    +0.00  1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rh1+ Kc2
                                   4.Nb4+ Kb3 5.Nxa2 Kxa2 6.Rh2 Ka1 7.Rh1+
                                   b1=Q 8.Rxb1+ Kxb1 9.f8=Q Rxf8 10.Kxf8
   6818125   9       8.8      :-)  1.Kg7
   7654117   9      10.0      :-)  1.Kg7
   9022158   9      11.7    +1.60  1.Kg7 f5 2.Kh6 f4 3.g7 Ra6+ 4.Kh7 R1a5
                                   5.Rh1+ Kc2 6.g8=Q Ra7+ 7.Kh8 Kxd3
                                   8.Qb3+ Ke4 9.Qxb2
   9863137   9:     12.8    +1.60  1.Kg7 f5 2.Kh6 f4 3.g7 Ra6+ 4.Kh7 R1a5
                                   5.Rh1+ Kc2 6.g8=Q Ra7+ 7.Kh8 Kxd3
                                   8.Qb3+ Ke4 9.Qxb2
  11254504  10      14.5      :-)  1.Kg7
  13121820  10      16.6      :-)  1.Kg7
  14167641  10      17.7      :-)  1.Kg7
  14167689  10      17.7      :-)  1.Kg7
  14977085  10      18.4   +Mat_6  1.Kg7 fxg6 2.Kh6 g5 3.Kh5 g4 4.Kh4 g3
                                   5.Kxg3 Ra7 6.Rxb2#
  20742147  10:     24.1   +Mat_6  1.Kg7 fxg6 2.Kh6 g5 3.Kh5 g4 4.Kh4 g3
                                   5.Kxg3 Ra7 6.Rxb2#
  22231213  11      25.5   +Mat_6  1.Kg7 fxg6 2.Kh6 g5 3.Kh5 g4 4.Kh4 g3
                                   5.Kxg3 Ra7 6.Rxb2#
  38831526  11:     40.6   +Mat_6  1.Kg7 fxg6 2.Kh6 g5 3.Kh5 g4 4.Kh4 g3
                                   5.Kxg3 Ra7 6.Rxb2#
  44482934  12      45.9   +Mat_6  1.Kg7 fxg6 2.Kh6 g5 3.Kh5 g4 4.Kh4 g3
                                   5.Kxg3 Ra7 6.Rxb2#
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yanquis1972
Posts: 1766
Joined: Wed Jun 03, 2009 12:14 am

Re: Test position: Mate in 6

Post by yanquis1972 »

5K2/5p2/6P1/8/8/3N4/rp5R/rk6 w - - 0 1

Analysis by Deep Rybka 4 x64 AN:

1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rh1+ Kc2 4.Nb4+ Kb3 5.Nxa2 Kxa2 6.f8Q Rxf8 7.Kxf8
+/= (0.37 ++) Depth: 6 00:00:01 1kN
1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rh1+ Kc2 4.Nb4+ Kb3 5.Nxa2 Kxa2 6.f8Q Rxf8 7.Kxf8
+/= (0.52 ++) Depth: 6 00:00:01 1kN
1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rh1+ Kc2 4.Nb4+ Kb3 5.Nxa2 Kxa2 6.f8Q Rxf8 7.Kxf8
+/= (0.57) Depth: 6 00:00:01 1kN
1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rh1+ Kc2 4.Nb4+ Kb3 5.Nxa2 Kxa2 6.f8Q Rxf8 7.Kxf8 b1Q 8.Rxb1 Kxb1 9.Ke7 Kc2 10.Kf6 Kd2 11.Ke5 Ke3
= (0.13) Depth: 7 00:00:01 5kN
1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kb3 9.Rf7
= (0.06) Depth: 8 00:00:01 11kN
1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2 10.Kd6
= (0.06) Depth: 9 00:00:01 15kN
1.gxf7 Ra8+ 2.Kg7[] R1a2 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2 10.Kd6
= (0.00) Depth: 10 00:00:01 27kN, tb=2
1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2 10.Kd6
= (0.00) Depth: 11 00:00:01 49kN, tb=6
1.gxf7 Ra8+ 2.Kg7 R1a2 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2 10.Kd6
= (0.00) Depth: 12 00:00:02 93kN, tb=24
1.gxf7 Ra8+ 2.Kg7[] R1a2[] 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2 10.Kd6
= (0.00) Depth: 13 00:00:02 183kN, tb=63
1.gxf7 Ra8+ 2.Kg7[] R1a2[] 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2 10.Kd6
= (0.00) Depth: 14 00:00:02 296kN, tb=121
1.gxf7 Ra8+ 2.Kg7[] R1a2[] 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2 10.Kd6
= (0.00) Depth: 15 00:00:03 425kN, tb=217
1.gxf7 Ra8+[] 2.Kg7 R1a2[] 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2 10.Kd6
= (0.00) Depth: 16 00:00:03 600kN, tb=358
1.gxf7 Ra8+[] 2.Kg7 R1a2 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2 10.Kd6
= (0.00) Depth: 17 00:00:04 897kN, tb=569
1.gxf7 Ra8+[] 2.Kg7 R1a2 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2 10.Kd6
= (0.00) Depth: 18 00:00:05 1297kN, tb=903
1.gxf7 Ra8+[] 2.Kg7 R1a2 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2 10.Kd6
= (0.00) Depth: 19 00:00:06 1688kN, tb=1258
1.gxf7 Ra8+[] 2.Kg7 R1a2 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2 10.Kd6
= (0.00) Depth: 20 00:00:08 2190kN, tb=1724
1.gxf7 Ra8+[] 2.Kg7 R1a2 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2 10.Kd6
= (0.00) Depth: 21 00:00:09 2574kN, tb=2004
1.gxf7 Ra8+[] 2.Kg7 R1a2 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2 10.Kd6
= (0.00) Depth: 22 00:00:12 3561kN, tb=2874
1.gxf7 Ra8+[] 2.Kg7 R1a2 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2 10.Kd6
= (0.00) Depth: 23 00:00:16 4933kN, tb=4191
1.gxf7 Ra8+[] 2.Kg7 R1a2 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2 10.Kd6
= (0.00) Depth: 24 00:00:22 7107kN, tb=6325
1.gxf7 Ra8+[] 2.Kg7 R1a2 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2 10.Kd6
= (0.00) Depth: 25 00:00:30 10100kN, tb=9555
1.gxf7 Ra8+[] 2.Kg7 R1a2 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2 10.Kd6
= (0.00) Depth: 26 00:00:46 15686kN, tb=15430
1.gxf7 Ra8+[] 2.Kg7 R1a2 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2
= (0.00) Depth: 27 00:01:10 23919kN, tb=23958
1.gxf7 Ra8+[] 2.Kg7 R1a2 3.Rf2 Ka1 4.Nxb2 Rxb2 5.f8Q Rxf8 6.Rxf8 Rg2+ 7.Kf6 Kb2 8.Ke5 Kc3 9.Rf3+ Kd2
= (0.00) Depth: 28 00:01:55 37474kN, tb=37601
1.Kg7 fxg6 2.Kh6 g5 3.Kh5[] g4 4.Kh4 g3 5.Kxg3
= (0.12 ++) Depth: 28 00:03:00 58303kN, tb=53187
1.Kg7 fxg6 2.Kh6 g5 3.Kh5[] g4 4.Kh4 g3 5.Kxg3
+/= (0.27 ++) Depth: 28 00:03:05 59530kN, tb=53407
1.Kg7 fxg6 2.Kh6 g5 3.Kh5[] g4 4.Kh4 g3 5.Kxg3
+/= (0.67 ++) Depth: 28 00:04:33 89578kN, tb=62158
1.Kg7 fxg6 2.Kh6 g5 3.Kh5[] g4 4.Kh4 g3 5.Kxg3 Ra3 6.Rxb2#[]
+- (1.47 ++) Depth: 28 00:05:18 105mN, tb=67362
1.Kg7 fxg6 2.Kh6 g5 3.Kh5[] g4 4.Kh4 g3 5.Kxg3 Ra3 6.Rxb2#[]
+- (3.07 ++) Depth: 28 00:05:51 116mN, tb=71013
1.Kg7 fxg6 2.Kh6 g5 3.Kh5[] g4 4.Kh4 g3 5.Kxg3 Ra3 6.Rxb2#[]
+- (6.27 ++) Depth: 28 00:07:00 143mN, tb=74567
1.Kg7 fxg6 2.Kh6 g5 3.Kh5[] g4 4.Kh4 g3 5.Kxg3 Ra3 6.Rxb2#[]
+- (12.67 ++) Depth: 28 00:10:32 233mN, tb=82386
1.Kg7 fxg6 2.Kh6 g5 3.Kh5[] g4 4.Kh4 g3 5.Kxg3 Ra3 6.Rxb2#[]
+- (25.47 ++) Depth: 28 00:16:21 398mN, tb=87642
1.Kg7 fxg6 2.Kh6 g5 3.Kh5[] g4 4.Kh4 g3 5.Kxg3 Ra3 6.Rxb2#[]
+- (51.07 ++) Depth: 28 00:21:04 531mN, tb=92084
1.Kg7 fxg6 2.Kh6 g5 3.Kh5[] g4 4.Kh4 g3 5.Kxg3 Ra3 6.Rxb2#[]
+- (#6) Depth: 28 00:21:13 536mN, tb=92218
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kgburcham
Posts: 2016
Joined: Sun Feb 17, 2008 4:19 pm

Re: Test position: Mate in 6

Post by kgburcham »

[D] 5K2/5p2/6P1/8/8/3N4/rp5R/rk6 w - -

Nullmove disabled

Zappa Mexico II (2048 MB)

13/41 0:00 +M6 1.Kg7 fxg6 2.Kh6 g5 3.Kh5 g4 4.Kh4 g3 5.Kxg3 Ra8 6.Rxb2+ (3.321.197) 3609
13/41 0:00 +M6 1.Kg7 fxg6 2.Kh6 g5 3.Kh5 g4 4.Kh4 g3 5.Kxg3 Ra8 6.Rxb2+ (3.504.503) 3681
14/41 0:01 +M6 1.Kg7 fxg6 2.Kh6 g5 3.Kh5 g4 4.Kh4 g3 5.Kxg3 Ra8 6.Rxb2+ (4.049.470) 3708
14/41 0:01 +M6 1.Kg7 fxg6 2.Kh6 g5 3.Kh5 g4 4.Kh4 g3 5.Kxg3 Ra8 6.Rxb2+ (4.409.482) 3768
15/41 0:01 +M6 1.Kg7 fxg6 2.Kh6 g5 3.Kh5 g4 4.Kh4 g3 5.Kxg3 Ra8 6.Rxb2+ (5.918.237) 3911
15/41 0:01 +M6 1.Kg7 fxg6 2.Kh6 g5 3.Kh5 g4 4.Kh4 g3 5.Kxg3 Ra8 6.Rxb2+ (6.261.452) 3973
16/41 0:02 +M6 1.Kg7 fxg6 2.Kh6 g5 3.Kh5 g4 4.Kh4 g3 5.Kxg3 Ra8 6.Rxb2+ (10.419.525) 4254
16/41 0:02 +M6 1.Kg7 fxg6 2.Kh6 g5 3.Kh5 g4 4.Kh4 g3 5.Kxg3 Ra8 6.Rxb2+ (10.994.318) 4271
17/41 0:04 +M6 1.Kg7 fxg6 2.Kh6 g5 3.Kh5 g4 4.Kh4 g3
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Anil
Posts: 540
Joined: Sat Nov 11, 2006 2:56 pm

Re: Test position: Mate in 6

Post by Anil »

Analysis by Houdini 1.03

It seems to get it at Depth 19 at around 11 seconds.


FEN: 5K2/5p2/6P1/8/8/3N4/rp5R/rk6 w - - 0 1

Houdini_w32_2CPU:
4/17 00:00 1.961 490.000 +0.09 g6xf7 Ra2a8+ Kf8g7 Ra1a2 Rh2h1+ Kb1c2 Nd3b4+ Kc2b3 Nb4xa2 Kb3xa2
5/17 00:00 2.341 334.000 +0.09 g6xf7 Ra2a8+ Kf8g7 Ra1a2 Rh2h1+ Kb1c2 Nd3b4+ Kc2b3 Nb4xa2 Kb3xa2
6/21 00:00 3.492 436.000 +0.02 g6xf7 Ra2a8+ Kf8g7 Ra1a2 Rh2h1+ Kb1c2 Nd3b4+ Kc2b3 Nb4xa2 Kb3xa2 Kg7f6 b2b1Q Rh1xb1 Ka2xb1
7/21 00:00 4.781 531.000 +0.02 g6xf7 Ra2a8+ Kf8g7 Ra1a2 Rh2h1+ Kb1c2 Nd3b4+ Kc2b3 Nb4xa2 Kb3xa2 Kg7f6 b2b1Q Rh1xb1 Ka2xb1
8/23 00:00 15.334 1.095.000 +0.02 g6xf7 Ra2a8+ Kf8g7 Ra1a2 Rh2h1+ Kb1c2 Nd3b4+ Kc2b3 Nb4xa2 Kb3xa2 Kg7f6 Ra8a6+ Kf6e7 Ra6a8 Ke7d6
9/27 00:00 26.261 1.250.000 +0.02 g6xf7 Ra2a8+ Kf8g7 Ra1a2 Rh2h1+ Kb1c2 Nd3b4+ Kc2b3 Nb4xa2 Kb3xa2 f7f8Q Ra8xf8 Kg7xf8 b2b1Q Rh1xb1 Ka2xb1 Kf8g7 Kb1a1 Kg7h7 Ka1a2
10/27 00:00 46.955 958.000 +0.02 g6xf7 Ra2a8+ Kf8g7 Ra1a2 Rh2h1+ Kb1c2 Nd3b4+ Kc2b3 Nb4xa2 Kb3xa2 f7f8Q Ra8xf8 Kg7xf8 b2b1Q Rh1xb1 Ka2xb1 Kf8g7 Kb1a1 Kg7h7 Ka1a2 Kh7g8 Ka2a1
11/30 00:00 122.913 1.307.000 0.00 g6xf7 Ra2a8+ Kf8g7 Ra1a2 Rh2h1+ Kb1c2 Nd3b4+ Kc2b3 Nb4xa2 Kb3xa2 Rh1h2 Ka2b3 Rh2h1 Kb3a2 Rh1h2
12/30 00:00 246.327 1.529.000 0.00 g6xf7 Ra2a8+ Kf8g7 Ra1a2 Rh2h1+ Kb1c2 Nd3b4+ Kc2b3 Nb4xa2 Kb3xa2 Rh1h2 Ka2b3 Rh2h1 Kb3a2 Rh1h2
13/34 00:00 424.599 1.754.000 0.00 g6xf7 Ra2a8+ Kf8g7 Ra1a2 Rh2h1+ Kb1c2 Nd3b4+ Kc2b3 Nb4xa2 Kb3xa2 Rh1h2 Ka2b3 Rh2h1 Kb3a2 Rh1h2
14/35 00:00 752.446 2.001.000 +0.02 g6xf7 Ra2a8+ Kf8g7 Ra1a2 Rh2h1+ Kb1c2 Nd3b4+ Kc2b3 Nb4xa2 Kb3xa2 f7f8Q Ra8xf8 Kg7xf8 b2b1Q Rh1xb1 Ka2xb1 Kf8e7 Kb1a2 Ke7e6 Ka2b3 Ke6d5 Kb3a3 Kd5c4 Ka3a2 Kc4b4 Ka2b2
15/37 00:00 1.533.469 2.251.000 0.00 g6xf7 Ra2a8+ Kf8g7 Ra1a2 Rh2h1+ Kb1c2 Nd3b4+ Kc2b3 Nb4xa2 Kb3xa2 Rh1h2 Ka2b3 Rh2h1 Kb3a2 Rh1h2
16/38 00:01 2.958.620 2.465.000 0.00 g6xf7 Ra2a8+ Kf8g7 Ra1a2 Rh2h1+ Kb1c2 Nd3b4+ Kc2b3 Nb4xa2 Kb3xa2 Rh1h2 Ka2b3 Rh2h1 Kb3a2 Rh1h2
17/39 00:01 4.139.508 2.487.000 0.00 g6xf7 Ra2a8+ Kf8g7 Ra1a2 Rh2h1+ Kb1c2 Nd3b4+ Kc2b3 Nb4xa2 Kb3xa2 Rh1h2 Ka2b3 Rh2h1 Kb3a2 Rh1h2
18/43 00:03 7.958.071 2.561.000 +0.02 g6xf7 Ra2a8+ Kf8g7 Ra1a2 Rh2h1+ Kb1c2 Nd3b4+ Kc2b3 Nb4xa2 Kb3xa2 f7f8Q Ra8xf8 Kg7xf8 b2b1Q Rh1xb1 Ka2xb1 Kf8e7 Kb1c1 Ke7f6 Kc1d1 Kf6f5 Kd1e1 Kf5g4 Ke1f1 Kg4f3 Kf1g1 Kf3g3 Kg1h1 Kg3f2 Kh1h2
19/43 00:04 11.736.480 2.538.000 0.00 g6xf7 Ra2a8+ Kf8g7 Ra1a2 Rh2h1+ Kb1c2 Nd3b4+ Kc2b3 Nb4xa2 Kb3xa2 f7f8Q Ra8xf8 Kg7xf8 b2b1Q Rh1xb1 Ka2xb1 Kf8e7 Kb1c1 Ke7f6 Kc1d1 Kf6f5 Kd1e1 Kf5g4 Ke1f1 Kg4f3 Kf1g1 Kf3g3 Kg1h1 Kg3f3 Kh1g1 Kf3g3
19/43+ 00:06 14.813.604 2.355.000 +0.07 Kf8g7 f7xg6 Kg7h6 g6g5 Kh6h5 g5g4 Kh5h4 g4g3 Kh4xg3
19/48+ 00:11 27.561.612 2.464.000 +11.64 Kf8g7 f7xg6 Kg7h6 g6g5 Kh6h5 g5g4 Kh5h4 g4g3 Kh4xg3
19/48 00:11 27.575.733 2.464.000 +M6 Kf8g7 f7xg6 Kg7h6 g6g5 Kh6h5 g5g4 Kh5h4 g4g3 Kh4xg3 Ra2a5 Rh2xb2+
20/48 00:11 27.617.935 2.464.000 +M6 Kf8g7 f7xg6 Kg7h6 g6g5 Kh6h5 g5g4 Kh5h4 g4g3 Kh4xg3 Ra2a5 Rh2xb2+
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Dann Corbit
Posts: 12542
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: Test position: Mate in 6

Post by Dann Corbit »

zullil wrote:
Dann Corbit wrote:
zullil wrote:[D]5K2/5p2/6P1/8/8/3N4/rp5R/rk6 w - - 0 1

Originally posted here by Herbert L.
Not much challenge for computers
Stockfish, Crafty and Spark all fail to solve this ... at least for me.
This is the perfect place for Vincent's double null move. The position passes a lot of the standard "Can I do null move safely now?" tests. For instance, both sides have at least one major piece on the board and both have 9 points or more of material.

Another test that will help find the problem is legal move count. If any player is severely limited in legal moves, it does not make sense to perform the null move pruning at the root.
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Cubeman
Posts: 644
Joined: Fri Feb 02, 2007 3:11 am
Location: New Zealand

Re: Test position: Mate in 6

Post by Cubeman »

Chess Genius solves it quite quickly.Hiarcs, Naum and Crafty have trouble.
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Larry
Posts: 840
Joined: Sun Mar 12, 2006 3:59 am
Location: Sydney

Re: Test position: Mate in 6

Post by Larry »

Chessmaster 9000 solved this one more or less instantly. John Merlino
used to be CCC's Chessmaster specialist, but he does'nt drop in
here any more, at least not that I know of. But I had a sneaking
suspicion CM would bring home the bacon.
Curiously, CM needed to be in mate finder mode, not infinite,
to solve the problem.
regards all...
Larry
Growth is the problem; not the solution
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