Test Position, find the drawing resource 1.b6!!

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acase
Posts: 1002
Joined: Wed Mar 15, 2006 1:14 am
Location: Columbus, Ohio USA
Full name: Andrew R Case

Test Position, find the drawing resource 1.b6!!

Post by acase »

This one seems kind of tough.

[fen]nq6/pPpB4/2K5/1P2BN2/3Pk2p/5p2/8/6bN w - - 0 1[/fen]


1.b6!! axb6 2.Nxh4 Bxd4 And now another test position...find the move that draws here {this is much easier than the first position}:

[fen]nq6/1PpB4/1pK5/4B3/3bk2N/5p2/8/7N w - - 0 3[/fen]


I'll reveal the source of the position later, unless of course someone recognizes it.
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peter
Posts: 3487
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: Test Position, find the drawing resource 1.b6!!

Post by peter »

acase wrote: ↑Fri Jul 29, 2022 4:06 am This one seems kind of tough.

[fen]nq6/pPpB4/2K5/1P2BN2/3Pk2p/5p2/8/6bN w - - 0 1[/fen]


1.b6!! axb6 2.Nxh4 Bxd4 And now another test position...find the move that draws here {this is much easier than the first position}:

[fen]nq6/1PpB4/1pK5/4B3/3bk2N/5p2/8/7N w - - 0 3[/fen]


I'll reveal the source of the position later, unless of course someone recognizes it.
Indeed a nice one again, after some Forward- Backward:

nq6/pPpB4/2K5/1P2BN2/3Pk2p/5p2/8/6bN w - - 0 1

Analysis by Stockfish 130722:

1. = (0.00): 1.b6 axb6 2.Sxh4 f2 3.Lf5+ Ke3 4.Sg3 Kd2 5.Sf1+ Kd1 6.Lc8 b5 7.Sg2 Ke2 8.Sg3+ Kd3 9.Sf4+ Kc2 10.Lf5+ Kd1 11.Lg4+ Kd2 12.Sf1+ Ke1 13.Lh3 Da7 14.Lg2 b4 15.Sd3+ Ke2 16.Sf4+ Ke1

2. -+ (-5.46): 1.Lc8 f2 2.Sxh4 f1S 3.Sg3+ Sxg3 4.Lxg3 Lf2 5.Lxf2 Sb6 6.Lf5+ Kf4 7.Le1 De8+ 8.Kxc7 Sd5+ 9.Kd6 Dd8+ 10.Kc5 Sb6 11.Ld2+ Kg3 12.Le1+ Kh2 13.Kc6 Sc4 14.Ld7 Db6+ 15.Kd5 Se3+ 16.Ke4 Dxb7+ 17.Lc6 De7+ 18.Kd3 Kh3 19.Sf3 Da3+ 20.Ke4 Sc4 21.Kf5 Sd6+ 22.Kf4 Dc1+ 23.Ld2 Dc4 24.Le1 Df7+ 25.Ke3 De6+ 26.Kf4 Df5+ 27.Ke3 Sxb5 28.Lb4 Sd6 29.Se5 Dg5+ 30.Kd3 Dg3+ 31.Kc2 Df2+ 32.Kc3 De1+ 33.Kb3 Dd1+ 34.Kc3 Sf5 35.Lc5 Kh4 36.Kc4
Die Stellung ist ausgeglichen

Depth 37

Looking forward to the source, didn't find it in my own problem- database but didn't search anywhere else so far,
regards
Peter.
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peter
Posts: 3487
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: Test Position, find the drawing resource 1.b6!!

Post by peter »

peter wrote: ↑Fri Jul 29, 2022 11:08 am after some Forward- Backward:

nq6/pPpB4/2K5/1P2BN2/3Pk2p/5p2/8/6bN w - - 0 1

Analysis by Stockfish 130722:

1. = (0.00): 1.b6 axb6 2.Sxh4 f2 3.Lf5+ Ke3 4.Sg3 Kd2 5.Sf1+ Kd1 6.Lc8 b5 7.Sg2 Ke2 8.Sg3+ Kd3 9.Sf4+ Kc2 10.Lf5+ Kd1 11.Lg4+ Kd2 12.Sf1+ Ke1 13.Lh3 Da7 14.Lg2 b4 15.Sd3+ Ke2 16.Sf4+ Ke1

2. -+ (-5.46): 1.Lc8 f2 2.Sxh4 f1S 3.Sg3+ Sxg3 4.Lxg3 Lf2 5.Lxf2 Sb6 6.Lf5+ Kf4 7.Le1 De8+ 8.Kxc7 Sd5+ 9.Kd6 Dd8+ 10.Kc5 Sb6 11.Ld2+ Kg3 12.Le1+ Kh2 13.Kc6 Sc4 14.Ld7 Db6+ 15.Kd5 Se3+ 16.Ke4 Dxb7+ 17.Lc6 De7+ 18.Kd3 Kh3 19.Sf3 Da3+ 20.Ke4 Sc4 21.Kf5 Sd6+ 22.Kf4 Dc1+ 23.Ld2 Dc4 24.Le1 Df7+ 25.Ke3 De6+ 26.Kf4 Df5+ 27.Ke3 Sxb5 28.Lb4 Sd6 29.Se5 Dg5+ 30.Kd3 Dg3+ 31.Kc2 Df2+ 32.Kc3 De1+ 33.Kb3 Dd1+ 34.Kc3 Sf5 35.Lc5 Kh4 36.Kc4
Die Stellung ist ausgeglichen

Depth 37
Sting doesn't get the drawing eval soon, but the line with 1.b6 looks ok, e.g. as for the main point 3.Ng3+!


[fen]nq6/pPpB4/2K5/1P2BN2/3Pk2p/5p2/8/6bN w - - 0 1[/fen]


Analysis by Sting 28 (based on Stockfish 2.1.1) 64bit:

Code: Select all

1.Sxh4 
  Black has an edge: = (-0.28)  Depth: 1   00:00:01  165Nodes
1.Lc8 Sb6 
  Black is clearly better: -+ (-1.69)  Depth: 2   00:00:01  2116Nodes
...
1.Lc8 f2 2.Sxh4 f1S 3.Sf5 Kd3 4.Lf4 Sd2 5.Lxd2 Kxd2 
  Black is better: -/+ (-0.84 ++)  Depth: 10   00:00:01  131kN
1.Sxh4 Dg8 2.bxa8D Dxa8+ 3.Kxc7 Lxd4 4.Lc6+ Kxe5 5.Lxa8 f2 6.Sg3 Kf4 7.Lc6 Kxg3 
  Black is better: -/+ (-0.72 ++)  Depth: 10   00:00:01  202kN
...
1.Sxh4 Lxd4 2.Sg3+ Kxe5 3.Sxf3+ Kf4 4.Sxd4 Dg8 5.Le6 Df8 6.Sge2+ Ke5 7.bxa8D Dxa8+ 
  Black is slightly better: =/+ (-0.40 --)  Depth: 12   00:00:13  600kN
1.Lc8 h3 2.Shg3+ Kd3 3.Sf1 Lf2 4.Sh2 Sb6 5.Lxc7 Sxc8 6.Lxb8 Lxd4 7.bxc8D Ke4 
  The position is equal: = (-0.16 ++)  Depth: 12   00:00:13  703kN
1.Lc8 h3 2.Shg3+ Kd3 3.Sf1 Ke2 4.S1g3+ Kd3 
  The position is equal: = (0.00)  Depth: 12   00:00:13  786kN
1.Lc8 f2 
  The position is equal: = (-0.08 --)  Depth: 13   00:00:13  1130kN
1.Lc8 f2 
  The position is equal: = (-0.16 --)  Depth: 13   00:00:14  1162kN
1.Lc8 f2 2.Sxh4 f1S 3.Sg3+ Sxg3 4.Lxg3 Lxd4 5.Sg6 Kf3 6.Le5 Ke3 7.Lxd4+ Kxd4 8.Sf4 Sb6 9.Lf5 
  Black has an edge: = (-0.28 --)  Depth: 13   00:00:15  1220kN...
1.Lc8 h3 2.Sd6+ Ke3 3.Se8 f2 4.Sxf2 Lxf2 5.Sf6 Le1 6.Sd7 h2 7.Lxh2 Kxd4 8.Sxb8 Sb6 9.Lxc7 Sxc8 10.bxc8D Ke3 11.Kd7 Kf3 
  Black has an edge: = (-0.26 ++)  Depth: 16   00:00:51  11099kN
1.Lc8 f2 2.Sxh4 f1S 3.Sg3+ Sxg3 4.Lxg3 Lxd4 5.Sg6 Lg7 6.Lf4 Lc3 7.Lg3 Ld4 8.Sf8 Sb6 9.Lxc7 Dxc8 10.bxc8D Sxc8 
  Black is slightly better: =/+ (-0.48)  Depth: 16   00:00:52  13180kN
...
1.Lc8 f2 2.Sxh4 f1S 3.Sg6 Sd2 4.Sg3+ Kf3 5.Sh4+ Ke3 6.Sg2+ Kf2 7.Sf4 Sc4 8.Sh3+ Kg2 9.Sxg1 Sa5+ 10.Kd5 Sb6+ 11.Ke4 Sxc8 12.bxc8D Dxc8 13.Sf3 Df8 14.Lxc7 Dxf3+ 15.Ke5 Dxg3+ 16.Kf5 Dxc7 
  Black is clearly better: -+ (-1.63 --)  Depth: 18   00:01:14  31505kN
...
1.Lc8 f2 2.Sxh4 f1S 3.Sg3+ Sxg3 4.Lxg3 Lf2 5.Lxf2 Sb6 6.Lf5+ Kf4 7.Le1 Kg5 8.Lh3 Dd8 9.Lg3 De8+ 10.Kxc7 Sd5+ 11.Kd6 Db8+ 12.Kc5 Dxb7 13.Lg2 Kg4 14.Le5 Db6+ 15.Kxd5 Dxb5+ 
  Black is clearly better: -+ (-2.50 --)  Depth: 24   00:02:39  387MN
1.Lc8 f2 2.Sxh4 f1S 3.Sg3+ Sxg3 4.Lxg3 Lf2 5.Lxf2 Sb6 6.Lf5+ Kf4 7.Le1 Kg5 8.Lh3 Dd8 9.Lg3 De8+ 10.Kxc7 Sd5+ 11.Kd6 Db8+ 12.Kc5 Dxb7 13.Lg2 Kg4 14.Le5 Db6+ 15.Kxd5 Dxb5+ 16.Ke6 De8+ 17.Kd5 
  Black has a decisive advantage: -+ (-2.54)  Depth: 24   00:02:44  409MN
1.b6 
  Black is clearly better: -+ (-2.42 ++)  Depth: 25   00:02:57  549MN
1.b6 axb6 2.Sxh4 Lxd4 3.Sg3+ Kxe5 4.Sxf3+ Kf4 5.Se2+ Kxf3 6.Kb5 Kxe2 7.Lc6 Df8 8.bxa8D Dc5+ 9.Ka6 Kd2 10.Kb7 Dd6 11.Dg8 Ke3 12.Dg5+ Kf2 13.Df5+ Ke3 
  Black is clearly better: -+ (-2.30 ++)  Depth: 25   00:02:59  580MN
1.b6 axb6 2.Sxh4 Lxd4 3.Sg3+ Kxe5 4.Sxf3+ Kf4 5.Se2+ Ke3 6.Sexd4 b5 7.bxa8S Dxa8+ 8.Kxc7 b4 9.Le6 Da6 10.Ld5 Df6 11.Kd7 Kd3 12.Sb3 Df5+ 13.Kd6 Df8+ 14.Kc6 De8+ 15.Kc5 De7+ 16.Kb5 Dd6 
  Black is clearly better: -+ (-2.30)  Depth: 25   00:03:02  603MN
...
1.b6 axb6 
  Black is clearly better: -+ (-2.18 --)  Depth: 31   00:08:08  6168MN
1.b6 axb6 2.Sxh4 Lxd4 3.Sg3+ Kxe5 4.Sxf3+ Kf4 5.Se2+ Kxf3 6.Kb5 Kxe2 7.Lc6 Df8 8.bxa8D Dc5+ 9.Ka6 b5 10.Kb7 b4 11.Da2+ Ke3 12.De6+ Le5 13.Dh3+ Kd2 14.Dg2+ Kc1 15.Df1+ Kb2 16.De2+ Kb3 17.Dd3+ Dc3 18.Ld5+ Kb2 19.De2+ Kb1 20.Dd1+ Dc1 21.Db3+ Ka1 22.Dxb4 c5 23.Db3 c4 24.Lxc4 Lc3 25.Ld5 Le5 26.Db5 Dc5 
  Black is clearly better: -+ (-1.93 ++)  Depth: 31   00:09:28  7122MN
1.b6 axb6 2.Sxh4 Lxd4 3.Sg3+ Kxe5 4.Sxf3+ Kf4 5.Se2+ Ke3 6.Sexd4 b5 7.bxa8S Dxa8+ 8.Kxc7 Da5+ 9.Kc6 b4 10.Le6 Kd3 11.Lf5+ Kc4 12.Le6+ Kc3 13.Sb5+ Kb2 14.Sfd4 Dd8 15.Kc5 De7+ 16.Kc4 b3 17.Kd3 Dh7+ 18.Kd2 Dh6+ 
  Black is clearly better: -+ (-1.89)  Depth: 31   00:10:07  8172MN
Peter.
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acase
Posts: 1002
Joined: Wed Mar 15, 2006 1:14 am
Location: Columbus, Ohio USA
Full name: Andrew R Case

Re: Test Position, find the drawing resource 1.b6!!

Post by acase »

peter wrote: ↑Fri Jul 29, 2022 2:05 pm
peter wrote: ↑Fri Jul 29, 2022 11:08 am after some Forward- Backward:

nq6/pPpB4/2K5/1P2BN2/3Pk2p/5p2/8/6bN w - - 0 1

Analysis by Stockfish 130722:

1. = (0.00): 1.b6 axb6 2.Sxh4 f2 3.Lf5+ Ke3 4.Sg3 Kd2 5.Sf1+ Kd1 6.Lc8 b5 7.Sg2 Ke2 8.Sg3+ Kd3 9.Sf4+ Kc2 10.Lf5+ Kd1 11.Lg4+ Kd2 12.Sf1+ Ke1 13.Lh3 Da7 14.Lg2 b4 15.Sd3+ Ke2 16.Sf4+ Ke1

2. -+ (-5.46): 1.Lc8 f2 2.Sxh4 f1S 3.Sg3+ Sxg3 4.Lxg3 Lf2 5.Lxf2 Sb6 6.Lf5+ Kf4 7.Le1 De8+ 8.Kxc7 Sd5+ 9.Kd6 Dd8+ 10.Kc5 Sb6 11.Ld2+ Kg3 12.Le1+ Kh2 13.Kc6 Sc4 14.Ld7 Db6+ 15.Kd5 Se3+ 16.Ke4 Dxb7+ 17.Lc6 De7+ 18.Kd3 Kh3 19.Sf3 Da3+ 20.Ke4 Sc4 21.Kf5 Sd6+ 22.Kf4 Dc1+ 23.Ld2 Dc4 24.Le1 Df7+ 25.Ke3 De6+ 26.Kf4 Df5+ 27.Ke3 Sxb5 28.Lb4 Sd6 29.Se5 Dg5+ 30.Kd3 Dg3+ 31.Kc2 Df2+ 32.Kc3 De1+ 33.Kb3 Dd1+ 34.Kc3 Sf5 35.Lc5 Kh4 36.Kc4
Die Stellung ist ausgeglichen

Depth 37
Sting doesn't get the drawing eval soon, but the line with 1.b6 looks ok, e.g. as for the main point 3.Ng3+!


[fen]nq6/pPpB4/2K5/1P2BN2/3Pk2p/5p2/8/6bN w - - 0 1[/fen]


Analysis by Sting 28 (based on Stockfish 2.1.1) 64bit:

Code: Select all

1.Sxh4 
  Black has an edge: = (-0.28)  Depth: 1   00:00:01  165Nodes
1.Lc8 Sb6 
  Black is clearly better: -+ (-1.69)  Depth: 2   00:00:01  2116Nodes
...
1.Lc8 f2 2.Sxh4 f1S 3.Sf5 Kd3 4.Lf4 Sd2 5.Lxd2 Kxd2 
  Black is better: -/+ (-0.84 ++)  Depth: 10   00:00:01  131kN
1.Sxh4 Dg8 2.bxa8D Dxa8+ 3.Kxc7 Lxd4 4.Lc6+ Kxe5 5.Lxa8 f2 6.Sg3 Kf4 7.Lc6 Kxg3 
  Black is better: -/+ (-0.72 ++)  Depth: 10   00:00:01  202kN
...
1.Sxh4 Lxd4 2.Sg3+ Kxe5 3.Sxf3+ Kf4 4.Sxd4 Dg8 5.Le6 Df8 6.Sge2+ Ke5 7.bxa8D Dxa8+ 
  Black is slightly better: =/+ (-0.40 --)  Depth: 12   00:00:13  600kN
1.Lc8 h3 2.Shg3+ Kd3 3.Sf1 Lf2 4.Sh2 Sb6 5.Lxc7 Sxc8 6.Lxb8 Lxd4 7.bxc8D Ke4 
  The position is equal: = (-0.16 ++)  Depth: 12   00:00:13  703kN
1.Lc8 h3 2.Shg3+ Kd3 3.Sf1 Ke2 4.S1g3+ Kd3 
  The position is equal: = (0.00)  Depth: 12   00:00:13  786kN
1.Lc8 f2 
  The position is equal: = (-0.08 --)  Depth: 13   00:00:13  1130kN
1.Lc8 f2 
  The position is equal: = (-0.16 --)  Depth: 13   00:00:14  1162kN
1.Lc8 f2 2.Sxh4 f1S 3.Sg3+ Sxg3 4.Lxg3 Lxd4 5.Sg6 Kf3 6.Le5 Ke3 7.Lxd4+ Kxd4 8.Sf4 Sb6 9.Lf5 
  Black has an edge: = (-0.28 --)  Depth: 13   00:00:15  1220kN...
1.Lc8 h3 2.Sd6+ Ke3 3.Se8 f2 4.Sxf2 Lxf2 5.Sf6 Le1 6.Sd7 h2 7.Lxh2 Kxd4 8.Sxb8 Sb6 9.Lxc7 Sxc8 10.bxc8D Ke3 11.Kd7 Kf3 
  Black has an edge: = (-0.26 ++)  Depth: 16   00:00:51  11099kN
1.Lc8 f2 2.Sxh4 f1S 3.Sg3+ Sxg3 4.Lxg3 Lxd4 5.Sg6 Lg7 6.Lf4 Lc3 7.Lg3 Ld4 8.Sf8 Sb6 9.Lxc7 Dxc8 10.bxc8D Sxc8 
  Black is slightly better: =/+ (-0.48)  Depth: 16   00:00:52  13180kN
...
1.Lc8 f2 2.Sxh4 f1S 3.Sg6 Sd2 4.Sg3+ Kf3 5.Sh4+ Ke3 6.Sg2+ Kf2 7.Sf4 Sc4 8.Sh3+ Kg2 9.Sxg1 Sa5+ 10.Kd5 Sb6+ 11.Ke4 Sxc8 12.bxc8D Dxc8 13.Sf3 Df8 14.Lxc7 Dxf3+ 15.Ke5 Dxg3+ 16.Kf5 Dxc7 
  Black is clearly better: -+ (-1.63 --)  Depth: 18   00:01:14  31505kN
...
1.Lc8 f2 2.Sxh4 f1S 3.Sg3+ Sxg3 4.Lxg3 Lf2 5.Lxf2 Sb6 6.Lf5+ Kf4 7.Le1 Kg5 8.Lh3 Dd8 9.Lg3 De8+ 10.Kxc7 Sd5+ 11.Kd6 Db8+ 12.Kc5 Dxb7 13.Lg2 Kg4 14.Le5 Db6+ 15.Kxd5 Dxb5+ 
  Black is clearly better: -+ (-2.50 --)  Depth: 24   00:02:39  387MN
1.Lc8 f2 2.Sxh4 f1S 3.Sg3+ Sxg3 4.Lxg3 Lf2 5.Lxf2 Sb6 6.Lf5+ Kf4 7.Le1 Kg5 8.Lh3 Dd8 9.Lg3 De8+ 10.Kxc7 Sd5+ 11.Kd6 Db8+ 12.Kc5 Dxb7 13.Lg2 Kg4 14.Le5 Db6+ 15.Kxd5 Dxb5+ 16.Ke6 De8+ 17.Kd5 
  Black has a decisive advantage: -+ (-2.54)  Depth: 24   00:02:44  409MN
1.b6 
  Black is clearly better: -+ (-2.42 ++)  Depth: 25   00:02:57  549MN
1.b6 axb6 2.Sxh4 Lxd4 3.Sg3+ Kxe5 4.Sxf3+ Kf4 5.Se2+ Kxf3 6.Kb5 Kxe2 7.Lc6 Df8 8.bxa8D Dc5+ 9.Ka6 Kd2 10.Kb7 Dd6 11.Dg8 Ke3 12.Dg5+ Kf2 13.Df5+ Ke3 
  Black is clearly better: -+ (-2.30 ++)  Depth: 25   00:02:59  580MN
1.b6 axb6 2.Sxh4 Lxd4 3.Sg3+ Kxe5 4.Sxf3+ Kf4 5.Se2+ Ke3 6.Sexd4 b5 7.bxa8S Dxa8+ 8.Kxc7 b4 9.Le6 Da6 10.Ld5 Df6 11.Kd7 Kd3 12.Sb3 Df5+ 13.Kd6 Df8+ 14.Kc6 De8+ 15.Kc5 De7+ 16.Kb5 Dd6 
  Black is clearly better: -+ (-2.30)  Depth: 25   00:03:02  603MN
...
1.b6 axb6 
  Black is clearly better: -+ (-2.18 --)  Depth: 31   00:08:08  6168MN
1.b6 axb6 2.Sxh4 Lxd4 3.Sg3+ Kxe5 4.Sxf3+ Kf4 5.Se2+ Kxf3 6.Kb5 Kxe2 7.Lc6 Df8 8.bxa8D Dc5+ 9.Ka6 b5 10.Kb7 b4 11.Da2+ Ke3 12.De6+ Le5 13.Dh3+ Kd2 14.Dg2+ Kc1 15.Df1+ Kb2 16.De2+ Kb3 17.Dd3+ Dc3 18.Ld5+ Kb2 19.De2+ Kb1 20.Dd1+ Dc1 21.Db3+ Ka1 22.Dxb4 c5 23.Db3 c4 24.Lxc4 Lc3 25.Ld5 Le5 26.Db5 Dc5 
  Black is clearly better: -+ (-1.93 ++)  Depth: 31   00:09:28  7122MN
1.b6 axb6 2.Sxh4 Lxd4 3.Sg3+ Kxe5 4.Sxf3+ Kf4 5.Se2+ Ke3 6.Sexd4 b5 7.bxa8S Dxa8+ 8.Kxc7 Da5+ 9.Kc6 b4 10.Le6 Kd3 11.Lf5+ Kc4 12.Le6+ Kc3 13.Sb5+ Kb2 14.Sfd4 Dd8 15.Kc5 De7+ 16.Kc4 b3 17.Kd3 Dh7+ 18.Kd2 Dh6+ 
  Black is clearly better: -+ (-1.89)  Depth: 31   00:10:07  8172MN

Hi Peter,

Indeed it looks like Sting does find the correct sequence of moves. The first position is from a 2019 study by Yuri Bazlov after black's 10th move in the main line, and the second position is after black's 12th move in the main line.

As you are well aware I have been looking at studies recently to see if they can be cooked and I came across this one that the engines thought was a possible cook, but after looking at it very carefully I found out that the engines were wrong. It seems that the studies that are from about 2015 or newer are very difficult to find cooks in presumably because the composers are using the fine programs we have today to help them create their studies. I haven't found any cooks from about 2015 or newer, but I'm not saying that none exist.

Here is the pgn of the study:

[pgn][Event "1st Prize Mikitovics 70 JT 2019 sect.draw"]
[Site "?"]
[Date "?"]
[Round "?"]
[White "Yuri Bazlov, Russia"]
[Black "?"]
[Result "1/2-1/2"]
[BlackElo "2400"]
[WhiteElo "2000"]
[TimeControl "300+3"]
[SetUp "1"]
[FEN "R3K1Bq/pPp1B1N1/8/1P5p/1rnP4/4kp2/8/6bN w - - 0 1"]
[Termination "normal"]
[PlyCount "39"]
[WhiteType "program"]
[BlackType "human"]

1. Nf5+ $1 (1. Bg5+ $1 1. .. Kd3 $19) (1. Bf6 $2 1. .. Qxg8+ 2. Ke7 Qd5 3.
b8=Q Bh2 $19) (1. Kf7 $2 1. .. Rxb5 2. b8=Q Rxb8 3. Rxb8 Kd2 4. Bf6 Qh6 5.
Nf5 Nd6+ 6. Nxd6 cxd6 {$19 black has a simple technical win. Therefore})
({It seems that a far advanced pawn guarantees white an easy draw. But it
is not. If, for example,} 1. b8=Q $2 Qxg8+ $19) 1. .. Kf4 {$1 With other
wastes, white has a chance to win.} 2. Kd7 {$3 It is necessary to abandon
the idea that a draw is possible only with the Queen.} (2. b8=Q $2 Qxg8+ 3.
Kd7 Qd5+ $19) 2. .. Nb6+ $1 3. Kc6 {$1 Wandering in search of salvation,
the king of white must very accurately choose the place for his bet.} (3.
Kxc7 $2 3. .. Rc4+ 4. Bc5 Bxd4 5. Bxc4 Be5+ 6. Kc6 Nxa8 7. Be6 Kg5 8. Nd6
Qb8 9. Kd5 Bh2 $19) (3. Ke6 $2 Bxd4 4. Nxd4 Qh6+ 5. Kf7 Rxd4 6. Rd8 Rxd8 7.
Bxd8 Nd7 $19) 3. .. Rc4+ $1 4. Bxc4 (4. Bc5 $2 Qf6+ 5. Kxc7 Bh2 $19) 4. ..
Nxa8 5. Be6 $1 (5. Ng7 $2 Qb8 6. Ne6+ (6. Bf7 Bxd4 7. Nxh5+ Ke3 8. Bg5+ Kd3
9. Nf4+ Kc3 $19) 6. .. Kf5 7. Bd8 h4 8. Bd5 f2 9. Nxf2 Bxf2 10. Nxc7 Nxc7
11. Bxc7 Qe8+ 12. Kc5 Qe3 13. b8=Q Qxd4+ 14. Kc6 Qc5+ 15. Kd7 (15. Kb7
Qxb5+) 15. .. Qxd5+ $19) 5. .. Qe8+ $1 (5. .. f2 6. Nxf2 Bxf2 7. b6 axb6 8.
Kd7 b5 9. Bd8 Nb6+ 10. Kxc7 Bxd4 11. Nxd4 $11) 6. Bd7 $1 Qg8 $1 7. Bc8 $1
Qe8+ $1 8. Bd7 Qb8 {$1 Now that the dangerous pawn is held and blocked,
black hopes to squeeze the opponent with material superiority. However} 9.
Bf6 $1 Ke4 $1 10. Be5 $1 h4 $1 (10. .. Kd3 11. Bc8 f2 12. Nxf2+ Bxf2 13. d5
a6 (13. .. a5 14. d6 Qa7 15. Kd7 Nb6+ 16. Ke8) (13. .. Bb6 14. Ne7) 14. d6
Qa7 15. b6 Qxb6+ 16. Kd7 Qb5+ 17. Ke6 {and draw have white "in pocket>>})
11. b6 $3 {Early} (11. Nxh4 $2 Bxd4 12. Ng3+ (12. Bh2 Qd8 13. Bf5+ Ke3 14.
Bg1+ Ke2 15. Ng3+ Kd1 16. b8=Q Qxb8 17. Bxd4 Qd8 18. Nxf3 Qd6+ 19. Kb7 Qd5+
20. Kxa7 Qxf3 $19) 12. .. Kxe5 13. Nxf3+ Kf4 $19) 11. .. axb6 {Black knight
was immured in the corner, where he got after taking the rook, but the best
is not visible.} {After} (11. .. Nxb6 12. Bxc7 Qg8 13. Nd6+ Kxd4 14. Bxb6+
axb6 15. Bc8 {white equalizes the material and the game.}) 12. Nxh4 $1 (12.
Nd6+ $2 cxd6 13. Bxd6 Qa7 $1 14. b8=Q Qa4+ 15. Kb7 Qxd7+ 16. Kxa8 Bxd4 17.
Qf8 b5 {and white it is time surrender.}) 12. .. Bxd4 $1 (12. .. Qg8 13.
Bf5+ Ke3 14. Bc8 $11) 13. Ng3+ $1 Kxe5 14. Nxf3+ Kf4 $1 15. Ne2+ $3 (15.
Nxd4 $2 Kxg3 $19) 15. .. Kxf3 {Black has an overwhelming advantage in
power.} 16. Kb5 {$3 Fantastic move: white also gives a pawn-his last hope,
which never became a queen.} Qxb7 {Nothing better.} (16. .. Kxe2 17. Bc6 $1
Qxb7 (17. .. Qg8 18. bxa8=Q Qb3+ 19. Ka6 Qa3+ 20. Kb7 {"despite black's two
extra pawns, they can't win.} (20. Kb5 $2 Qd3+ 21. Ka4 Qc4+ 22. Ka3 Kd2
$19)) 18. Bxb7 c6+ 19. Kxc6 $11) 17. Nxd4+ (17. Bc6+ $2 Qxc6+ 18. Kxc6 Kxe2
$19) 17. .. Ke3 18. Nc6 $1 Ke4 (18. .. Kf4 19. Bh3 {$1 A positional draw
with the black knight immured, whereas the queen has no safe place to go.
Only the black king can walk, but one in the field is not a warrior-the
opponent does not give him the opportunity to break through the defense he
built. For example,} (19. Be6 $2 Ke4 {$1 $19 ZZ}) 19. .. Kg5 20. Be6 {/d7
etc. positional draw}) 19. Be6 {$1 zz when black moves, it is a draw.} (19.
Bh3 $2 Kd5 $1 20. Bg2+ Kd6 $19) 19. .. Kf4 20. Bd7 {/h3 positional draw
Paradoxical positions: only two light pieces of white led by their leader
on a free board calmly restrain the onslaught of the king, queen, knight
and two pawns of the enemy!} 1/2-1/2[/pgn]


and here is the starting position of the study:

[fen]R3K1Bq/pPp1B1N1/8/1P5p/1rnP4/4kp2/8/6bN w - - 0 1[/fen]
Top
peter
Posts: 3487
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: Test Position, find the drawing resource 1.b6!!

Post by peter »

acase wrote: ↑Fri Jul 29, 2022 3:40 pm Indeed it looks like Sting does find the correct sequence of moves. The first position is from a 2019 study by Yuri Bazlov after black's 10th move in the main line, and the second position is after black's 12th move in the main line.

As you are well aware I have been looking at studies recently to see if they can be cooked and I came across this one that the engines thought was a possible cook, but after looking at it very carefully I found out that the engines were wrong. It seems that the studies that are from about 2015 or newer are very difficult to find cooks in presumably because the composers are using the fine programs we have today to help them create their studies. I haven't found any cooks from about 2015 or newer, but I'm not saying that none exist.

Here is the pgn of the study:

[pgn][Event "1st Prize Mikitovics 70 JT 2019 sect.draw"]
[Site "?"]
[Date "?"]
[Round "?"]
[White "Yuri Bazlov, Russia"]
[Black "?"]
[Result "1/2-1/2"]
[BlackElo "2400"]
[WhiteElo "2000"]
[TimeControl "300+3"]
[SetUp "1"]
[FEN "R3K1Bq/pPp1B1N1/8/1P5p/1rnP4/4kp2/8/6bN w - - 0 1"]
[Termination "normal"]
[PlyCount "39"]
[WhiteType "program"]
[BlackType "human"]

1. Nf5+ $1 (1. Bg5+ $1 1. .. Kd3 $19) (1. Bf6 $2 1. .. Qxg8+ 2. Ke7 Qd5 3.
b8=Q Bh2 $19) (1. Kf7 $2 1. .. Rxb5 2. b8=Q Rxb8 3. Rxb8 Kd2 4. Bf6 Qh6 5.
Nf5 Nd6+ 6. Nxd6 cxd6 {$19 black has a simple technical win. Therefore})
({It seems that a far advanced pawn guarantees white an easy draw. But it
is not. If, for example,} 1. b8=Q $2 Qxg8+ $19) 1. .. Kf4 {$1 With other
wastes, white has a chance to win.} 2. Kd7 {$3 It is necessary to abandon
the idea that a draw is possible only with the Queen.} (2. b8=Q $2 Qxg8+ 3.
Kd7 Qd5+ $19) 2. .. Nb6+ $1 3. Kc6 {$1 Wandering in search of salvation,
the king of white must very accurately choose the place for his bet.} (3.
Kxc7 $2 3. .. Rc4+ 4. Bc5 Bxd4 5. Bxc4 Be5+ 6. Kc6 Nxa8 7. Be6 Kg5 8. Nd6
Qb8 9. Kd5 Bh2 $19) (3. Ke6 $2 Bxd4 4. Nxd4 Qh6+ 5. Kf7 Rxd4 6. Rd8 Rxd8 7.
Bxd8 Nd7 $19) 3. .. Rc4+ $1 4. Bxc4 (4. Bc5 $2 Qf6+ 5. Kxc7 Bh2 $19) 4. ..
Nxa8 5. Be6 $1 (5. Ng7 $2 Qb8 6. Ne6+ (6. Bf7 Bxd4 7. Nxh5+ Ke3 8. Bg5+ Kd3
9. Nf4+ Kc3 $19) 6. .. Kf5 7. Bd8 h4 8. Bd5 f2 9. Nxf2 Bxf2 10. Nxc7 Nxc7
11. Bxc7 Qe8+ 12. Kc5 Qe3 13. b8=Q Qxd4+ 14. Kc6 Qc5+ 15. Kd7 (15. Kb7
Qxb5+) 15. .. Qxd5+ $19) 5. .. Qe8+ $1 (5. .. f2 6. Nxf2 Bxf2 7. b6 axb6 8.
Kd7 b5 9. Bd8 Nb6+ 10. Kxc7 Bxd4 11. Nxd4 $11) 6. Bd7 $1 Qg8 $1 7. Bc8 $1
Qe8+ $1 8. Bd7 Qb8 {$1 Now that the dangerous pawn is held and blocked,
black hopes to squeeze the opponent with material superiority. However} 9.
Bf6 $1 Ke4 $1 10. Be5 $1 h4 $1 (10. .. Kd3 11. Bc8 f2 12. Nxf2+ Bxf2 13. d5
a6 (13. .. a5 14. d6 Qa7 15. Kd7 Nb6+ 16. Ke8) (13. .. Bb6 14. Ne7) 14. d6
Qa7 15. b6 Qxb6+ 16. Kd7 Qb5+ 17. Ke6 {and draw have white "in pocket>>})
11. b6 $3 {Early} (11. Nxh4 $2 Bxd4 12. Ng3+ (12. Bh2 Qd8 13. Bf5+ Ke3 14.
Bg1+ Ke2 15. Ng3+ Kd1 16. b8=Q Qxb8 17. Bxd4 Qd8 18. Nxf3 Qd6+ 19. Kb7 Qd5+
20. Kxa7 Qxf3 $19) 12. .. Kxe5 13. Nxf3+ Kf4 $19) 11. .. axb6 {Black knight
was immured in the corner, where he got after taking the rook, but the best
is not visible.} {After} (11. .. Nxb6 12. Bxc7 Qg8 13. Nd6+ Kxd4 14. Bxb6+
axb6 15. Bc8 {white equalizes the material and the game.}) 12. Nxh4 $1 (12.
Nd6+ $2 cxd6 13. Bxd6 Qa7 $1 14. b8=Q Qa4+ 15. Kb7 Qxd7+ 16. Kxa8 Bxd4 17.
Qf8 b5 {and white it is time surrender.}) 12. .. Bxd4 $1 (12. .. Qg8 13.
Bf5+ Ke3 14. Bc8 $11) 13. Ng3+ $1 Kxe5 14. Nxf3+ Kf4 $1 15. Ne2+ $3 (15.
Nxd4 $2 Kxg3 $19) 15. .. Kxf3 {Black has an overwhelming advantage in
power.} 16. Kb5 {$3 Fantastic move: white also gives a pawn-his last hope,
which never became a queen.} Qxb7 {Nothing better.} (16. .. Kxe2 17. Bc6 $1
Qxb7 (17. .. Qg8 18. bxa8=Q Qb3+ 19. Ka6 Qa3+ 20. Kb7 {"despite black's two
extra pawns, they can't win.} (20. Kb5 $2 Qd3+ 21. Ka4 Qc4+ 22. Ka3 Kd2
$19)) 18. Bxb7 c6+ 19. Kxc6 $11) 17. Nxd4+ (17. Bc6+ $2 Qxc6+ 18. Kxc6 Kxe2
$19) 17. .. Ke3 18. Nc6 $1 Ke4 (18. .. Kf4 19. Bh3 {$1 A positional draw
with the black knight immured, whereas the queen has no safe place to go.
Only the black king can walk, but one in the field is not a warrior-the
opponent does not give him the opportunity to break through the defense he
built. For example,} (19. Be6 $2 Ke4 {$1 $19 ZZ}) 19. .. Kg5 20. Be6 {/d7
etc. positional draw}) 19. Be6 {$1 zz when black moves, it is a draw.} (19.
Bh3 $2 Kd5 $1 20. Bg2+ Kd6 $19) 19. .. Kf4 20. Bd7 {/h3 positional draw
Paradoxical positions: only two light pieces of white led by their leader
on a free board calmly restrain the onslaught of the king, queen, knight
and two pawns of the enemy!} 1/2-1/2[/pgn]


and here is the starting position of the study:

[fen]R3K1Bq/pPp1B1N1/8/1P5p/1rnP4/4kp2/8/6bN w - - 0 1[/fen]
Sting yet is on the rigth track at once again:

R3K1Bq/pPp1B1N1/8/1P5p/1rnP4/4kp2/8/6bN w - - 0 1

Analysis by Sting 28 (based on Stockfish 2.1.1) 64bit:

1.Nf5+ Kf4
-+ (-2.94 --) Depth: 7 00:00:00 4kN
...
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Kxc7 Rc4+ 4.Bxc4 Nxa8+ 5.bxa8Q Qxa8 6.Be6 Qe8 7.Bd6+ Kg5 8.Be7+ Kg6 9.d5 Bb6+ 10.Kb7 f2 11.Nh4+ Kh7
-+ (-3.19) Depth: 15 00:00:01 8217kN
...
1.Kf8 Rxb5 2.b8Q Rxb8+ 3.Rxb8 Nb6 4.Kf7 Nd5 5.Bg5+ Kd3 6.Rb3+ Kc2 7.Rxf3 Bxd4 8.Nf5 Qg7+ 9.Nxg7 Bxg7 10.Kxg7 Nb6 11.Bc4 Nxc4 12.Rg3 Nb6
-+ (-2.94 ++) Depth: 16 00:00:01 11186kN
...
1.Kf7 Rxb5 2.b8Q Rxb8 3.Rxb8 Kd2 4.Bg5+ Kc2 5.Bf6 Qh6 6.Nf5 Nd6+ 7.Nxd6 cxd6 8.Ng3 h4 9.Bg5 Qxg5 10.Bh7+ Kc3 11.Ne4+ Kxd4 12.Nxg5 Kc5 13.Nxf3 Kc6 14.Nxg1 Kd7 15.Kg8 Kc6 16.Rb1
-+ (-2.80 ++) Depth: 21 00:00:05 136MN
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Kc6 Rc4+ 4.Bxc4 Nxa8 5.Ng7 Ke4 6.Ng3+ Kxd4 7.Bf8 Qxf8 8.Ne6+ Kxc4 9.Nxf8 Kd3 10.bxa8Q Kd2 11.Nxh5 Kd3 12.Kxc7 Kd2 13.Qxf3 Kc1 14.Kd7 Kb1
-+ (-2.53 ++) Depth: 21 00:00:08 225MN
...
1.Nf5+
-/+ (-1.33 ++) Depth: 26 00:02:01 4407MN
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Kc6 Rc4+ 4.Bxc4 Nxa8 5.Ng7 Qb8 6.Bf7 Bxd4 7.Nxh5+ Ke3 8.Bg5+ Kd3 9.Nf4+ Kc3 10.Ng3 Nb6 11.Ne4+ Kc2 12.Ne6 Qh8 13.Nxd4+ Qxd4 14.b8Q Qxe4+ 15.Kxc7 f2 16.Qxa7 Qe5+ 17.Kxb6 Qd6+ 18.Kb7 Qd7+ 19.Kb6 Qxa7+
-/+ (-1.53) Depth: 26 00:02:08 4637MN

Even if this one latest copied line deviates with 5.Ng7 into a ?-commented one of the study.
BTW, I hadn't noticed the output of the last but one posting before was with 16 of 30 possible threads "only".

Thanks for showing,
regards
Peter.
Top
peter
Posts: 3487
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: Test Position, find the drawing resource 1.b6!!

Post by peter »

peter wrote: ↑Fri Jul 29, 2022 5:58 pm
Sting yet is on the rigth track at once again:

R3K1Bq/pPp1B1N1/8/1P5p/1rnP4/4kp2/8/6bN w - - 0 1

Analysis by Sting 28 (based on Stockfish 2.1.1) 64bit:

Code: Select all

1.Nf5+ Kf4 
  -+  (-2.94 --)   Depth: 7   00:00:00  4kN
...
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Kxc7 Rc4+ 4.Bxc4 Nxa8+ 5.bxa8Q Qxa8 6.Be6 Qe8 7.Bd6+ Kg5 8.Be7+ Kg6 9.d5 Bb6+ 10.Kb7 f2 11.Nh4+ Kh7 
  -+  (-3.19)   Depth: 15   00:00:01  8217kN
...
1.Kf8 Rxb5 2.b8Q Rxb8+ 3.Rxb8 Nb6 4.Kf7 Nd5 5.Bg5+ Kd3 6.Rb3+ Kc2 7.Rxf3 Bxd4 8.Nf5 Qg7+ 9.Nxg7 Bxg7 10.Kxg7 Nb6 11.Bc4 Nxc4 12.Rg3 Nb6 
  -+  (-2.94 ++)   Depth: 16   00:00:01  11186kN
...
1.Kf7 Rxb5 2.b8Q Rxb8 3.Rxb8 Kd2 4.Bg5+ Kc2 5.Bf6 Qh6 6.Nf5 Nd6+ 7.Nxd6 cxd6 8.Ng3 h4 9.Bg5 Qxg5 10.Bh7+ Kc3 11.Ne4+ Kxd4 12.Nxg5 Kc5 13.Nxf3 Kc6 14.Nxg1 Kd7 15.Kg8 Kc6 16.Rb1 
  -+  (-2.80 ++)   Depth: 21   00:00:05  136MN
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Kc6 Rc4+ 4.Bxc4 Nxa8 5.Ng7 Ke4 6.Ng3+ Kxd4 7.Bf8 Qxf8 8.Ne6+ Kxc4 9.Nxf8 Kd3 10.bxa8Q Kd2 11.Nxh5 Kd3 12.Kxc7 Kd2 13.Qxf3 Kc1 14.Kd7 Kb1 
  -+  (-2.53 ++)   Depth: 21   00:00:08  225MN
...
1.Nf5+ 
  -/+  (-1.33 ++)   Depth: 26   00:02:01  4407MN
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Kc6 Rc4+ 4.Bxc4 Nxa8 5.Ng7 Qb8 6.Bf7 Bxd4 7.Nxh5+ Ke3 8.Bg5+ Kd3 9.Nf4+ Kc3 10.Ng3 Nb6 11.Ne4+ Kc2 12.Ne6 Qh8 13.Nxd4+ Qxd4 14.b8Q Qxe4+ 15.Kxc7 f2 16.Qxa7 Qe5+ 17.Kxb6 Qd6+ 18.Kb7 Qd7+ 19.Kb6 Qxa7+ 
  -/+  (-1.53)   Depth: 26   00:02:08  4637MN
R3K1Bq/pPp1B1N1/8/1P5p/1rnP4/4kp2/8/6bN w - - 0 1

Analysis by Crystal 040722:

Code: Select all

1.Kf7 Rxb5 2.b8Q Rxb8 3.Rxb8 Kd2 4.Ng3 Bxd4 
  -+  (-2.15)   Depth: 7/13   00:00:03  243kN
1.Kf7 Rxb5 2.b8Q Rxb8 3.Rxb8 Kd2 4.Bf6 h4 5.Kg6 f2 
  -+  (-2.12)   Depth: 8/14   00:00:03  413kN
1.Kf7 Rxb5 2.b8Q Rxb8 3.Rxb8 Kd2 4.Bf6 h4 5.Kg6 Be3 6.Nf5 
  -+  (-1.89)   Depth: 9/16   00:00:03  587kN
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Kxc7 Rc4+ 4.Bxc4 Nxa8+ 5.bxa8Q Qxa8 6.Nhg3 h4 
  -/+  (-0.79)   Depth: 10/20   00:00:03  1900kN
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Ke6 Bxd4 4.Nxd4 Qh6+ 5.Kf7 Rxd4 6.b8Q Kf5 7.Ng3+ Kg4 8.Nf5 Kxf5 
  -/+  (-1.23)   Depth: 11/20   00:00:03  2395kN
1.Bf6 Qxg8+ 2.Ke7 Qd5 3.b8Q Kd3 4.Qg8 Qxg8 5.Rxg8 Rxb5 6.Nf5 f2 7.Rg3+ Ke2 8.Nxf2 Bxf2 
  -/+  (-1.59)   Depth: 12/25   00:00:03  5772kN
1.Bf6 Qxg8+ 2.Ke7 Qd5 3.b8Q Rxb5 4.Qd8 Nd6 5.Ne6 f2 6.Nxf2 Bxf2 7.Rxa7 Bg3 8.Ra3+ Ke2 9.Qa8 Nf5+ 10.Kf7 h4 11.Ra2+ Kf3 
  -/+  (-1.59)   Depth: 13/29   00:00:03  7036kN
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Kc6 Rc4+ 4.Bxc4 Nxa8 5.Ng7 Qb8 6.Bf6 h4 7.Be6 Ke4 8.Bf5+ Ke3 9.Be5 f2 10.Bh3 Ke2 11.b6 Nxb6 
  -+  (-1.67)   Depth: 14/39   00:00:03  13357kN
...
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Kc6 Rc4+ 4.Bxc4 Nxa8 5.Ng7 Qb8 6.Bf6 h4 7.Be6 f2 8.Be5+ Kg5 9.Bh3 Kg6 10.Bf5+ Kf7 11.Bd3 Bh2 12.Bc4+ Kf8 13.Ne6+ Ke7 14.Bxh2 Nb6 15.Nxf2 Nxc4 
  -+  (-2.04)   Depth: 19/42   00:00:05  78894kN
...
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Kc6 Rc4+ 4.Bxc4 Nxa8 5.Be6 Qe8+ 6.Bd7 Qb8 7.bxa8B Qxa8+ 8.Kxc7 Qd5 9.Nhg3 Bh2 10.Nxh5+ Ke4+ 11.Nhg3+ Bxg3+ 12.Nxg3+ Kxd4 13.Bd6 f2 14.Bc6 Qf7+ 15.Kb8 Kc4 16.Bc7 Qh7 17.Kb7 Kb4 18.b6 axb6 19.Kxb6 Qd3 20.Bg2 Qg6+ 21.Bc6 Qf6 22.Nf1 Qd4+ 23.Kb7 Qd3 24.Nh2 Kc4 25.Bb8 Qb3+ 26.Kc7 Qb1 27.Bf3 Kc5 28.Ba7+ Kb5 29.Bc6+ Ka6 
  -+  (-1.95)   Depth: 33/74   00:01:32  2550MN
...
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Kc6 Rc4+ 4.Bxc4 Nxa8 5.Be6 Qe8+ 6.Bd7 Qb8 7.Bf6 Ke4 8.Be5 h4 9.Bc8 f2 10.Nxh4 f1N 11.Ng6 Nd2 12.Ng3+ Kf3 13.Nf5 Nc4 14.bxa8R Qxa8+ 15.Kxc7 Kf2 16.Nge7 Qf3 17.Bg3+ Ke2 18.Kb8 Kd1 19.d5 Qd3 20.Ba6 Nb6 21.Bc7 Nxd5 22.Nxd5 Qxf5 23.Ne7 Qf8+ 24.Nc8 Qf7 25.Bd6 Qd7 26.Bg3 Kd2 27.Bf4+ Kd3 28.Bd6 Kc2 29.Bc7 Qe8 30.Bd6 Bb6 31.Bf4 
  -/+  (-1.34)   Depth: 35/72   00:02:10  3606MN
...
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Kc6 Rc4+ 4.Bxc4 Nxa8 5.Be6 Qe8+ 6.Bd7 Qb8 7.bxa8R Qxa8+ 8.Kxc7 Qd5 9.Nhg3 Bh2 10.Nxh5+ Ke4+ 11.Nhg3+ Bxg3+ 12.Nxg3+ Kxd4 13.Bd6 f2 14.Bc6 Qe6 15.Nf1 Qf7+ 16.Kb8 Qc4 17.Nd2 Qc2 18.Nf3+ Kc4 19.Nh2 Qh7 20.Kc8 Qd3 21.Kc7 Qg6 22.Kd7 Qf6 23.Kc7 Qe6 24.Bd7 Qf7 25.Nf1 Kc3 26.Be5+ Kb3 27.Nh2 Kc4 28.Bd6 Qg7 29.Kc6 Qh7 30.Be6+ Kd4 31.Bd7 Qh8 32.Kc7 Qg7 33.Kc8 Qh6 34.Kc7 Qxh2 35.Bxh2 f1Q 36.Bd6 Qf7 37.Kc6 Kc4 38.Bb8 Qd5+ 39.Kc7 Qd4 40.Kc8 Qh8+ 41.Kc7 
  -+  (-2.87)   Depth: 46/92   00:18:31  28543MN
Crystalllite is a Crystal- modification from user dorsz of OpenChess forum :

R3K1Bq/pPp1B1N1/8/1P5p/1rnP4/4kp2/8/6bN w - - 0 1

Analysis by Crystallite 1.1a-bmi2:

Code: Select all

1.b8Q Qxg8+ 2.Bf8 Kd3 3.Nf5 Be3 4.Nxe3 Nxe3 
  -/+  (-1.06)   Depth: 7/9   00:00:00  100kN
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Ke6 Bxd4 4.Nxd4 Qe5+ 5.Kf7 Nxa8 6.bxa8Q 
  =  (0.11)   Depth: 8/18   00:00:00  758kN
1.Bf6 Qxg8+ 2.Ke7 Qd5 3.b8Q Rxb5 4.Qh8 c5 5.Re8 Nd6 6.Ng3 Nxe8 
  -/+  (-1.47)   Depth: 9/22   00:00:00  1461kN
...
1.Bf6 Qxg8+ 2.Ke7 Qd5 3.b8Q Rxb5 4.Qh8 f2 5.Nxf2 Bxf2 6.Rd8 Qe4+ 7.Kf8 Kd3 8.Re8 Qg4 9.Ne6 Nd6 10.Qh7+ Rf5 
  -+  (-1.76)   Depth: 12/26   00:00:00  4338kN
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Ke6 Bxd4 4.Nxd4 Qe5+ 5.Kf7 Rxd4 6.b8Q Rd7 7.Qf8 Rxe7+ 8.Kg6+ Kg4 9.Bf7 Nxa8 10.Nf2+ Kh4 
  -+  (-2.71)   Depth: 13/35   00:00:00  12288kN
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Kc6 Rc4+ 4.Bxc4 Nxa8 5.Be6 Qb8 6.bxa8B Qxa8+ 7.Kxc7 Qe4 8.Bd6+ Kg5 9.Be7+ Kg6 10.Bf7+ Kh7 11.Nhg3 Bh2 12.Bd6 Bxg3 13.Nxg3 Qxd4 14.Bxh5 Qb6+ 15.Kd7 Qxb5+ 16.Kd8 Qa5+ 17.Kd7 Qa4+ 18.Ke7 f2 19.Kf8 
  -+  (-2.88)   Depth: 14/38   00:00:00  17760kN
...
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Kc6 Rc4+ 4.Bxc4 Nxa8 5.Be6 Qb8 6.d5 Ke5 7.d6 Bc5 8.b6 axb6 9.d7 Bxe7 10.Nxe7 Kxe6 11.Nc8 Qxb7+ 12.Kxb7 Kxd7 13.Na7 Ke6 14.Kxa8 Kf5 15.Nb5 Kg4 16.Nc3 b5 17.Nxb5 Kh3 18.Nf2+ Kg2 19.Nd1 h4 20.Nd4 h3 21.Ne3+ Kf2 22.Ndf5 c5 23.Ng4+ Ke1 24.Ng3 f2 25.Ne3 c4 26.Kb7 c3 27.Kc6 
  -/+  (-1.46)   Depth: 26/67   00:00:16  615MN
...
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Kc6 Rc4+ 4.Bxc4 Nxa8 5.Be6 Qb8 6.d5 Ke5 7.d6 Bc5 8.b6 axb6 9.d7 Bxe7 10.Nxe7 Kxe6 11.Nc8 Qxb7+ 12.Kxb7 Kxd7 13.Na7 Ke6 14.Kc6 Ke5 15.Nb5 Kf4 16.Nc3 Ke3 17.Nd5+ Kd4 18.Nf4 Kc4 19.Nxh5 b5 20.Nf6 b4 21.Ne4 Nb6 22.Nhf2 Kd4 23.Nc5 Nd7 24.Ne6+ Ke3 25.Ng4+ Kd2 26.Kxd7 b3 27.Nd4 b2 28.Nxf3+ Kc3 29.Kxc7 b1Q 30.Nge5 Kb4 31.Kb6 Qa1 32.Nc6+ Kc4 33.Nfe5+ Kd5 34.Kb7 Qh1 35.Kb6 Qh4 
  =  (-0.22)   Depth: 32/122   00:01:19  3055MN
...
1.Nf5+ Kf4 2.Kd7 Nb6+ 3.Kc6 Rc4+ 4.Bxc4 Nxa8 5.Be6 Qe8+ 6.Bd7 Qb8 7.bxa8B Qxa8+ 8.Kxc7 Qd5 9.Nhg3 Bh2 10.Nxh5+ Ke4+ 11.Nhg3+ Bxg3+ 12.Nxg3+ Kxd4 13.Nf5+ Kd3 14.Bd6 f2 15.Ng3 Qf7 16.Kc8 Qg8+ 17.Kc7 Kc4 18.Bc6 Qe6 19.Ne4 Qxe4 20.Bxe4 f1Q 21.Bc6 Qf7+ 22.Kc8 Qe6+ 23.Kc7 Kd4 24.Ba3 Qf7+ 25.Kd8 Qg8+ 26.Kc7 Qg7+ 27.Kd8 Qf7 28.Bd6 Qe6 29.Kc7 Kc4 30.Bd7 Qf7 31.Kc8 Qg8+ 32.Kc7 Qg7 33.Kc8 Qd4 34.Bc7 Qf6 35.Kb7 Kc5 36.Bb8 a5 37.bxa6 Qb6+ 38.Kc8 Qxa6+ 39.Kc7 Qb6+ 40.Kc8 Kd5 41.Bc7 Qa6+ 42.Kb8 
  =  (-0.27)   Depth: 41/97   00:09:55  23188MN
Strange enough again struggling with the position 10 moves later (had tried it at this one before already too), Crystallite as well as the original Crystal, with Syzygy Probe Limit 6 as well as with 0 like here:

nq6/pPpB4/2K5/1P2BN2/3Pk2p/5p2/8/6bN w - - 0 1

Analysis by Crystallite 1.1a-bmi2:

Code: Select all

11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 
  -/+  (-1.32)   Depth: 7/8   00:00:00  71kN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 
  -/+  (-1.45)   Depth: 8/10   00:00:00  97kN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kd2 19.Bb7 
  -/+  (-1.50)   Depth: 9/16   00:00:00  145kN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kd2 19.Bb7 Qd3 
  -/+  (-1.45)   Depth: 10/18   00:00:00  205kN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kd2 
  -/+  (-1.56)   Depth: 11/22   00:00:00  302kN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kd2 19.Bb7 Qg4 20.Bc8 Qe2 21.Nc6 
  -+  (-1.72)   Depth: 12/33   00:00:00  433kN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kd2 19.Bb7 Qg4 20.Bc8 Qe2 21.Nc6 Kc3 22.Nf4 Qe4 23.Be6 Nxe5 24.Nd5+ Kb2 
  -+  (-1.75)   Depth: 13/33   00:00:00  541kN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kd2 19.Bb7 Qg4 20.Bc8 Qe2 21.Nc6 Kc3 22.Nf4 Qe4 23.Be6 Nxe5 24.Nd5+ Kb2 
  -+  (-1.75)   Depth: 14/33   00:00:00  639kN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kc3 19.Bb7 Qg4 20.Bc6 Kb3 21.Bd7 Qe4 22.Bc6 Qd3 23.Nf4 Qd1 24.Ne6 Nxe5 
  -+  (-1.63)   Depth: 15/33   00:00:00  1271kN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kd2 19.Bb7 Qg4 20.Kb8 Kc2 21.Bc8 Qg2 22.Be6 Nxe5 23.Nxe5 Bxd4 24.N5c6 
  -/+  (-1.58)   Depth: 16/33   00:00:00  1814kN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kd2 19.Bb7 Qd3 20.Kb8 Be3 21.Nf4 Qb3 22.Nfd5 Nxe5 23.dxe5 Qxb5 24.Nxe3 
  -/+  (-1.60)   Depth: 17/40   00:00:00  3163kN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kd2 19.Bb7 Qd3 20.Kb8 Bxd4 21.Bxd4 Qxd4 22.Nc8 Nd6 23.Nxd6 Qxd6+ 24.Kxa7 Qxg6 25.b6 Qg7 26.Kb8 Qe5+ 27.Ka7 Ke3 28.Ba6 Qc5 29.Bf1 
  -+  (-1.66)   Depth: 18/53   00:00:00  5312kN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kd2 19.Bb7 Qd3 20.Kb8 Bxd4 21.Bxd4 Qxd4 22.Nc8 Nd6 23.Nxd6 Qxd6+ 24.Kxa7 Qxg6 25.Ba6 Qg7+ 26.Kb8 
  -+  (-1.78)   Depth: 19/53   00:00:00  6019kN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kd2 19.Bf5 Qe2 20.Bd7 Qd3 21.Nf4 Qc2 22.Bc6 Qb2 23.Nfd5 Nxe5 24.dxe5 Qxe5+ 25.Kb7 Qg7 26.Kb8 Kc1 27.Kb7 Bc5 28.b6 Bxb6 29.Nxb6 Qxe7+ 30.Ka6 axb6 
  -+  (-1.87)   Depth: 20/53   00:00:00  13641kN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kd2 19.Bf5 Qe2 20.Bd7 Qd3 21.Nf4 Qb3 22.Bc6 Qb2 23.Bf6 Na3 24.Kb7 Nxb5 25.Bxb5 Qxb5+ 26.Kxa7 Qd7+ 27.Ka8 Bxd4 28.Bxd4 Qe8+ 29.Kb7 Qxe7+ 30.Ka6 Qd6+ 31.Bb6 Qxf4 32.Kb5 
  -+  (-1.99)   Depth: 21/53   00:00:01  30751kN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kd2 19.Bf5 Qe2 20.Bd7 Qd3 21.Nf4 Qc2 22.Kb7 Qb2 23.Nfd5 Bxd4 24.Bxd4 Qxd4 25.Bc6 Nd6+ 26.Kc7 Qc5 27.b6 axb6 28.Nxb6 Nb5+ 29.Kd7 Qxb6 30.Nd5 
  -+  (-2.03)   Depth: 22/53   00:00:01  33849kN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kd2 19.Bf5 Qe2 20.Bd7 Nxe5 21.dxe5 Bb6+ 22.Kb8 Qc4 23.e6 Qc7+ 24.Ka8 a5 25.Nc8 a4 26.e7 Qxd7 27.Nxb6 Qe8+ 28.Ka7 Qxg6 29.Nxa4 Qe4 30.Ka6 Qxe7 31.b6 
  -+  (-1.83)   Depth: 23/53   00:00:01  36999kN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kc3 19.Bb7 Qg4 20.Bc6 Nxe5 21.dxe5 Bb6+ 22.Kd6 Bc5+ 23.Kc7 Kd4 24.Bd7 Qg5 25.Nc6+ Kc3 26.Be8 Qe3 27.Nce7 Kc4 28.Bc6 Bxe7 29.Nxe7 Kc5 30.Kd8 Qxe5 31.Kd7 Qa1 
  -/+  (-1.56)   Depth: 24/56   00:00:02  77303kN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kc3 19.Bb7 Qg4 20.Bc6 Bxd4 21.Bxd4+ Qxd4 22.Nc8 Na5 23.Nge7 Qc5 24.Kd7 Kd4 25.Nd6 Qe5 26.Ndc8 Qb8 27.Nd6 Nc4 28.Nxc4 Kxc4 29.Nd5 Qe5 30.Nc7 Kc5 31.Ne6+ Kb6 32.Nd8 Qg7+ 33.Ke8 Qf6 34.Kd7 Qh4 
  -/+  (-1.55)   Depth: 25/61   00:00:03  122MN
11.Bc8 f2 
  -+  (-1.67 --)   Depth: 26/63   00:00:04  153MN
11.Bc8 f2 
  -+  (-1.71 --)   Depth: 26/63   00:00:04  158MN
11.Bc8 f2 
  -+  (-1.77 --)   Depth: 26/63   00:00:05  191MN
11.Bc8 f2 
  -+  (-1.86 --)   Depth: 26/63   00:00:06  235MN
11.Bc8 
  -+  (-1.78 ++)   Depth: 26/63   00:00:06  239MN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kc3 19.Bb7 Qg4 20.Bc6 Bxd4 21.Nd5+ Kb3 22.Bxd4 Qxd4 23.Nge7 Na5 24.Kb8 Kc4 25.Nc7 Qb6+ 26.Kc8 Qe3 27.Ned5 Qg1 28.Bd7 Kc5 29.Kb8 Kd6 30.Bc8 Qg8 31.Nb4 Qf8 32.Nbd5 Nc4 33.Kb7 
  -+  (-1.73)   Depth: 26/63   00:00:06  239MN
11.Bc8 f2 
  -+  (-1.86 --)   Depth: 27/51   00:00:06  263MN
11.Bc8 
  -+  (-1.82 ++)   Depth: 27/58   00:00:07  315MN
11.Bc8 
  -+  (-1.76 ++)   Depth: 27/58   00:00:08  318MN
11.Bc8 
  -+  (-1.67 ++)   Depth: 27/58   00:00:08  319MN
11.Nxh4 
  -/+  (-1.27 ++)   Depth: 27/79   00:00:11  445MN
11.Nxh4 
  -/+  (-0.95 ++)   Depth: 27/79   00:00:11  481MN
11.Nxh4 
  =/+  (-0.51 ++)   Depth: 27/91   00:00:13  543MN
11.Nxh4 Bxd4 12.Ng3+ Kxe5 13.Nxf3+ Kf4 14.Nxd4 Nb6 15.Nh5+ Ke3 16.Ne6 Nxd7 17.Kxd7 Qxb7 18.Nxc7 Qf3 19.Nf6 Qf5+ 20.Ke7 Kd4 21.Nd7 Qg5+ 22.Kd6 Qg3+ 23.Kc6 Qf3+ 24.Kd6 Qa3+ 25.Kc6 Qe7 26.b6 Qe4+ 27.Kd6 Qf4+ 28.Ke7 Qh4+ 29.Ke8 axb6 30.Nxb6 Kc5 31.Nbd5 Kd6 32.Kf7 Qh7+ 33.Kf6 Qh5 34.Kg7 Qg5+ 35.Kf7 Kd7 36.Kf8 Qg6 37.Na8 Kd6 38.Nac7 Qh6+ 39.Kg8 Kd7 40.Kf7 Kc6 41.Ke7 Qg6 42.Kd8 Qd3 43.Ke8 Qf1 44.Ne3 Qf3 45.Ncd5 Kd6 
  -/+  (-1.30)   Depth: 27/98   00:00:14  568MN
11.Nxh4 Bxd4 
  -/+  (-1.34 --)   Depth: 28/73   00:00:14  578MN
11.Nxh4 Bxd4 
  -/+  (-1.38 --)   Depth: 28/73   00:00:14  585MN
11.Nxh4 Bxd4 
  -/+  (-1.44 --)   Depth: 28/73   00:00:14  592MN
11.Nxh4 Bxd4 
  -/+  (-1.53 --)   Depth: 28/73   00:00:15  624MN
11.Nxh4 Bxd4 12.Ng3+ Kxe5 13.Nxf3+ Kf4 14.Nxd4 Nb6 15.Nh5+ Ke3 16.Ne6 Nxd7 17.Kxd7 Qxb7 18.Nxc7 Qf3 19.Nf6 Qf5+ 20.Ke7 Kd4 21.Nd7 Qg5+ 22.Kd6 Qg3+ 23.Kc6 Qf3+ 24.Kd6 Qa3+ 25.Kc6 Qe7 26.Nf8 Qe4+ 27.Kd6 Qf4+ 28.Kd7 Qf7+ 29.Kc6 Qf3+ 30.Kd7 Kc5 31.Nfe6+ Kb6 32.Kd6 Qg3+ 33.Kd7 Qe5 34.Kd8 Kb7 35.Kd7 Qf5 36.Ke7 Qh7+ 37.Kf6 Qh4+ 38.Ke5 Qc4 39.Kd6 Qd3+ 40.Kc5 Qe3+ 41.Kd6 Qg3+ 42.Ke7 Qxc7+ 43.Nxc7 Kxc7 44.Kf6 Kb6 
  -/+  (-1.57)   Depth: 28/99   00:00:16  675MN
11.b6 
  -+  (-1.77 ++)   Depth: 29/72   00:00:17  722MN
11.b6 
  -+  (-1.69 ++)   Depth: 29/72   00:00:18  748MN
11.b6 
  -/+  (-1.56 ++)   Depth: 29/72   00:00:18  755MN
11.b6 axb6 
  -+  (-1.93 --)   Depth: 29/72   00:00:18  759MN
11.b6 
  -+  (-1.66 ++)   Depth: 29/75   00:00:18  772MN
11.b6 
  -/+  (-1.33 ++)   Depth: 29/75   00:00:19  804MN
11.b6 axb6 
  -+  (-2.18 --)   Depth: 29/75   00:00:26  1114MN
11.b6 axb6 12.Nxh4 Bxd4 13.Ng3+ Kxe5 14.Nxf3+ Kf4 15.Nxd4 Kxg3 16.Bc8 b5 17.Nxb5 Nb6 18.Be6 Na4 19.Nxc7 Qa7 20.Nd5 Qc5+ 21.Kd7 Qb5+ 22.Kc7 Nc5 23.Bc8 Na6+ 24.Kd6 Qc5+ 25.Ke5 Qc6 26.Nf6 Qb5+ 27.Kd6 Qb6+ 28.Ke7 Qb4+ 29.Kd7 Qd4+ 30.Ke7 Qe5+ 31.Kf7 Nc5 32.Kg6 Qb2 33.Kh7 Kf4 34.Kg7 Nxb7 35.Bg4 
  -+  (-2.36)   Depth: 29/79   00:00:33  1403MN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.Nf5 Nc4 16.bxa8Q Qxa8+ 17.Kxc7 Qe4 18.Nfe7 Kc3 19.Bf5 Qf3 20.Be6 Nxe5 21.dxe5 Bb6+ 22.Kd6 Qd3+ 23.Nd5+ Kc4 24.Kc6 Kd4 25.Nge7 Kxe5 26.Kd7 Kd4 27.Nf5+ Kc5 28.Nd6 Qd4 29.Nc8 Kxb5 30.Nxa7+ Bxa7 31.Ke8 Kc5 32.Nc3 Qxc3 33.Ke7 Qd3 
  -+  (-2.37)   Depth: 30/54   00:00:34  1422MN
11.Bc8 
  -+  (-2.33 ++)   Depth: 31/49   00:00:36  1528MN
11.Bc8 
  -+  (-2.29 ++)   Depth: 31/49   00:00:36  1530MN
11.Bc8 
  -+  (-2.23 ++)   Depth: 31/56   00:00:36  1535MN
11.Bc8 
  -+  (-2.14 ++)   Depth: 31/56   00:00:36  1539MN
11.Bc8 
  -+  (-2.02 ++)   Depth: 31/75   00:00:37  1565MN
11.Bc8 
  -/+  (-1.34 ++)   Depth: 31/75   00:00:39  1640MN
11.Bc8 
  -/+  (-0.90 ++)   Depth: 31/75   00:00:41  1717MN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.b6 axb6 16.Kd7 Nc4 17.Nf4+ Kd2 18.Nd5 b5 19.Ne4+ Ke2 20.Nec3+ Kf3 21.Nxb5 Ncb6+ 22.Nxb6 Nxb6+ 23.Kd8 Nd5 24.Kd7 Be3 25.Kc6 Nb4+ 26.Kd7 Bf4 27.Bxc7 Bxc7 28.Nxc7 Qa7 29.d5 Ke4 30.d6 Qa4+ 31.Kd8 Nc6+ 32.Kd7 Nb8+ 33.Kd8 Qb4 34.Ne8 Qb6+ 35.Ke7 Nc6+ 36.Ke6 Kd4 37.d7 Qb4 38.Kf6 Nd8 39.Ng7 Qd6+ 40.Kg5 Qe5+ 41.Kg6 Kc5 42.Kh6 Qf4+ 43.Kh7 Kb6 44.Nh5 Qe5 45.Ng7 Ka7 46.Kg8 Qd6 47.Kh8 Qh2+ 48.Kg8 Qa2+ 49.Kh8 Qf7 
  -/+  (-1.37)   Depth: 31/89   00:00:46  1957MN
11.Bc8 
  -/+  (-1.32 ++)   Depth: 32/49   00:00:47  1982MN
11.Bc8 
  -/+  (-1.28 ++)   Depth: 32/49   00:00:47  1985MN
11.Bc8 
  -/+  (-1.22 ++)   Depth: 32/49   00:00:47  1989MN
11.Bc8 
  -/+  (-1.13 ++)   Depth: 32/64   00:00:47  1996MN
11.Bc8 
  -/+  (-1.01 ++)   Depth: 32/64   00:00:48  2011MN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.b6 axb6 16.Kd7 Nc4 17.Nf4+ Kd2 18.Ne4+ Ke3 19.Nf6 Qa7 20.N4d5+ Kf3 21.Nb4 Na5 22.Nc6 Nxc6 23.Kxc6 b5 24.Kxb5 Nb6 25.Kc6 Nc4 26.Nd7 Na5+ 27.Kxc7 Bf2 28.Nc5 Nc4 29.Nd7 Bh4 30.Kc6 Na5+ 31.Kc7 Be7 32.Nb8 Bc5 33.Nd7 Bb4 34.Bh2 Ke4 35.Nf6+ Kd3 36.Nd7 Bd2 37.Be5 Bc3 38.Nc5+ Ke3 39.Kd7 Bxd4 40.Bd6 Nc4 41.Bc7 Ne5+ 42.Ke8 Nc6 43.Ne6 Bf6 44.Bd6 Ke4 45.Bd7 Ne5 46.b8N Kd5 47.Bxe5 
  -/+  (-1.24)   Depth: 32/79   00:00:53  2203MN
11.Bc8 f2 
  -/+  (-1.15 --)   Depth: 33/57   00:00:58  2430MN
11.Bc8 
  -/+  (-1.12 ++)   Depth: 33/76   00:00:58  2438MN
11.Bc8 
  -/+  (-1.05 ++)   Depth: 33/76   00:00:58  2442MN
11.Bc8 
  -/+  (-0.96 ++)   Depth: 33/76   00:00:58  2458MN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.b6 axb6 16.Kd7 Nc4 17.Nf4+ Kd2 18.Ne4+ Ke3 19.Nf6 Na5 20.N6d5+ Kf3 21.Nxc7 Nxb7 22.Nb5 Nc7 23.Nd5 Na5 24.Ndxc7 Nc4 25.Nd5 Qa8 26.Kc7 Na5 27.Ne7 Ke2 28.Nd6 Qa7+ 29.Kd8 Nb3 30.Nc6 Qa4 31.Bd7 b5 32.Ke8 Bf2 33.Nxb5 Qxb5 
  -/+  (-1.06)   Depth: 33/85   00:01:00  2500MN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.b6 axb6 16.Kd7 Nc4 17.Nf4+ Kd2 18.Ne4+ Ke3 19.Nf6 Na5 20.N6d5+ Kf3 21.Nxc7 Nxb7 22.Nb5 Nc7 23.Nxc7 Bf2 24.Nfe6 Na5 25.Ng5+ Kg2 26.Ba6 Qg8 27.Nge6 Kf3 28.Bb5 Ke4 29.Bf1 Qh7+ 30.Kc8 Bh4 31.Bb5 Qg8+ 32.Kd7 Be1 33.Bd6 Bf2 34.Be5 Bh4 35.Ba6 Bg3 36.Bxg3 Qxg3 37.Bb5 Kf5 38.Nd5 Qh3 39.Ne7+ Ke4 40.d5 Qa3 41.d6 Ke5 42.Ng6+ Kf5 43.Ne7+ Kf6 44.Nc7 
  -/+  (-0.99)   Depth: 34/81   00:01:07  2831MN
11.Bc8 
  -/+  (-0.93 ++)   Depth: 35/51   00:01:13  3041MN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.b6 axb6 16.Kd7 Nc4 17.Nf4+ Kd2 18.Ne4+ Ke3 19.Nf6 Na5 20.N6d5+ Kf3 21.Nxc7 Nxb7 22.Nb5 Nc7 23.Nxc7 Na5 24.Ba6 Qf8 25.Bb5 Bf2 26.Nfe6 Qf7+ 27.Kd8 Qg8+ 28.Ke7 Bg3 29.Bxg3 Qxg3 30.Ne8 Qh4+ 31.Kd7 Qh7+ 32.Kd8 Qb7 33.N8c7 Qb8+ 34.Ke7 Qg8 35.Kd7 Qh8 36.Ng5+ Kg4 37.Nge6 Qh3 38.Kc8 Kf5 39.Ne8 Qc3+ 40.Kd7 Qf3 41.Nd6+ Kg4 42.Nd8 Qe3 43.Nc6 Nxc6 
  -/+  (-0.95)   Depth: 35/79   00:01:16  3170MN
11.Bc8 
  -/+  (-0.88 ++)   Depth: 36/77   00:01:18  3282MN
11.Bc8 
  -/+  (-0.85 ++)   Depth: 36/77   00:01:19  3294MN
11.Bc8 f2 
  -/+  (-0.97 --)   Depth: 36/77   00:01:31  3773MN
11.Bc8 f2 
  -/+  (-1.06 --)   Depth: 36/77   00:01:36  4001MN
11.Bc8 f2 
  -/+  (-1.18 --)   Depth: 36/77   00:01:59  4916MN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.b6 axb6 15.Ng3+ Kd3 16.Kd7 Nc4 17.Nf4+ Kd2 18.Ne4+ Ke3 19.Nf6 Qa7 20.N4d5+ Kf3 21.Ne7 Na5 22.Nc6 Nxc6 23.Kxc6 b5 24.Kxb5 Nb6 25.Kc6 Nc4 26.Nd7 Na5+ 27.Kxc7 Bf2 28.Nb8 Bxd4 29.Bxd4 Qxd4 30.Nc6 Nxc6 31.Kxc6 Qc4+ 32.Kd6 Qb4+ 33.Kc6 Kf4 34.Bd7 Qc3+ 35.Kb6 Qe5 36.Bc6 Qd6 37.Kb5 Ke5 38.Bf3 
  -/+  (-1.18)   Depth: 36/77   00:02:08  5283MN
11.Bc8 f2 
  -/+  (-1.47 --)   Depth: 37/81   00:02:29  6106MN
11.Bc8 
  -/+  (-1.43 ++)   Depth: 37/81   00:02:32  6251MN
11.Bc8 f2 
  -/+  (-1.51 --)   Depth: 37/81   00:02:36  6423MN
11.Bc8 
  -/+  (-1.44 ++)   Depth: 37/85   00:02:38  6497MN
11.Bc8 
  -/+  (-1.31 ++)   Depth: 37/85   00:02:38  6509MN
11.Bc8 
  -/+  (-1.15 ++)   Depth: 37/85   00:02:40  6559MN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.b6 axb6 16.Kd7 Nc4 17.Nf4+ Kd2 18.Ne4+ Ke3 19.Nf6 Qa7 20.Nh3 Na5 21.bxa8Q Qxa8 22.Nxg1 c5 23.Ng4+ Ke4 24.Nf6+ Kd3 25.d5 Nc4 26.Bf4 b5 27.d6 b4 28.Kc7 Qa7+ 29.Kc6 Na5+ 30.Kb5 Qb8+ 31.Kxa5 Qxc8 32.Be5 Qc6 33.Nf3 Qxf3 34.d7 Qa8+ 35.Kb5 Qd8 36.Kxc5 Qa5+ 37.Kd6 Kc4 38.Ke6 Qd8 39.Kd6 Kb5 40.Ke6 Kc6 41.Bc7 Qxc7 42.d8Q Qxd8 
  -/+  (-1.11)   Depth: 37/85   00:02:45  6764MN
11.Bc8 f2 
  -/+  (-0.84 --)   Depth: 38/85   00:03:06  7641MN
11.Bc8 f2 
  -/+  (-0.88 --)   Depth: 38/85   00:03:07  7673MN
11.Bc8 f2 
  -/+  (-0.94 --)   Depth: 38/85   00:03:07  7698MN
11.Bc8 f2 
  -/+  (-1.03 --)   Depth: 38/85   00:03:08  7720MN
11.Bc8 f2 
  -/+  (-1.15 --)   Depth: 38/85   00:03:12  7888MN
11.Bc8 f2 
  -+  (-1.84 --)   Depth: 38/89   00:03:51  9453MN
11.Bc8 f2 
  -+  (-2.27 --)   Depth: 38/110   00:05:31  13524MN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.Ng3+ Kd3 15.b6 axb6 16.Kd7 Nc4 17.Nf4+ Kd2 18.Ne4+ Ke3 19.Nf6 Na5 20.N6d5+ Kf3 21.Nxc7 Nxb7 22.Nb5 Nc5+ 23.Kd8 Nc7 24.Bxc7 Nb7+ 25.Kd7 Qa8 26.Nd5 Na5 27.Ne7 Bf2 28.d5 Nb3 29.Kd8 Nc5 30.Nd6 Qa4 31.Nb7 b5 32.d6 Qh4 33.Nxc5 Bxc5 34.Bb7+ Ke3 35.Kd7 Kd3 36.Bd5 Qd4 37.Kc6 b4 38.d7 
  -+  (-2.13)   Depth: 38/131   00:05:42  14000MN
11.Bc8 f2 
  -+  (-2.17 --)   Depth: 39/77   00:06:14  15270MN
11.Bc8 f2 
  -+  (-2.22 --)   Depth: 39/77   00:06:26  15774MN
11.Bc8 f2 12.Nxh4 f1N 13.Ng6 Ne3 14.b6 axb6 15.Ng3+ Kd3 16.Kd7 Nc4 17.Nf4+ Kd2 18.Ne4+ Ke3 19.Nf6 Na5 20.N4d5+ Kf3 21.Nb4 Qa7 22.Nc6 Nxc6 23.Kxc6 b5 24.Kxb5 Nb6 25.Kc6 Nc4 26.Nd7 Na5+ 27.Kxc7 Bf2 28.Bf6 Be1 29.Be5 Bb4 30.Bh2 Ke4 31.Nf6+ Kd3 32.Nd5 Be1 33.Be5 Kc4 34.Nf4 Kb5 35.Nd5 Ka6 36.Bh2 Nxb7 37.Kc6 Ba5 38.Be5 Qa8 39.Nc7+ Bxc7 40.Kxc7 Qa7 41.Bxb7+ Qxb7+ 42.Kd6 Kb5 43.Ke6 Qf3 44.Bg7 Kc4 
  -+  (-2.18)   Depth: 39/77   00:06:42  16431MN
11.Bc8 f2 
  -+  (-2.27 --)   Depth: 40/83   00:07:35  18568MN
11.Bc8 f2 
  -+  (-2.31 --)   Depth: 40/83   00:07:45  18959MN
11.Bc8 
  -+  (-2.27 ++)   Depth: 40/83   00:07:45  18974MN
11.Bc8 
  -+  (-2.18 ++)   Depth: 40/83   00:07:49  19130MN
Peter.
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User avatar
Dariusz
Posts: 379
Joined: Sat Jun 13, 2015 10:08 am
Location: Poland
Full name: Dariusz Domagała

Re: Test Position, find the drawing resource 1.b6!!

Post by Dariusz »

acase wrote: ↑Fri Jul 29, 2022 4:06 am This one seems kind of tough.

[fen]nq6/pPpB4/2K5/1P2BN2/3Pk2p/5p2/8/6bN w - - 0 1[/fen]


1.b6!! axb6 2.Nxh4 Bxd4 And now another test position...find the move that draws here {this is much easier than the first position}:

[fen]nq6/1PpB4/1pK5/4B3/3bk2N/5p2/8/7N w - - 0 3[/fen]


I'll reveal the source of the position later, unless of course someone recognizes it.
Amazing position. Very hard to solve.
Interestingly, Deep Junior Yokohama found quickly the move 1.b6!! , but sees no further correct continuation...

nq6/pPpB4/2K5/1P2BN2/3Pk2p/5p2/8/6bN w - - 0 1

Analysis by Deep Junior Yokohama:

1.bxa8N Qxa8+ 2.Kxc7 Qf8 3.b6 axb6 4.Nxh4 Bxd4 5.Ng3+ Kd3 6.Bf5+ Kc4 7.Bxd4 Qe7+ 8.Kc6 Qxh4 9.Bf2 Qh6+ 10.Kb7
-+ (-1.85) Depth: 22 00:00:32 240MN
1.b6 axb6 2.Nd6+ cxd6 3.Bxd6 Qa7 4.b8Q Qa4+
-/+ (-1.06) Depth: 22 00:01:43 619MN
1.b6 axb6 2.Nd6+ cxd6 3.Bxd6 Qa7 4.b8Q Qa4+ 5.Kb7 Qxd7+ 6.Kxa8 Bxd4 7.Bc7 f2 8.Nxf2+ Bxf2 9.Qf8 Bc5 10.Qf4+
-/+ (-1.51) Depth: 23 00:02:42 1122MN
1.b6 axb6 2.Nd6+ cxd6 3.Bxd6 Qa7 4.b8Q Qa4+ 5.Kb7 Qxd7+ 6.Kxa8 Bxd4 7.Bc7 f2 8.Nxf2+ Bxf2 9.Qf8 Bc5 10.Qf4+
-/+ (-1.07) Depth: 24 00:05:59 1781MN

(, 31.07.2022)
Regards, Darius
https://chessengeria.eu
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