Vass wrote on 12/28/11 at 14:32:29:

Let's make an experiment! Put your favourite engine to a test with this position:

This is a variation of a known position which leads to = after

**1. Ba4!! **But, what your favourite engine would say?!

**Edit:** FEN 3B4/1r2p3/r2p1p2/bkp1P1p1/1p1P1PPp/p1P4P/PP1K4/3B4 w - - 0 1

First of all one should know what engine to use where. So here my fav engine says this.

New game

3B4/1r2p3/r2p1p2/bkp1P1p1/1p1P1PPp/p1P4P/PP1K4/3B4 w - - 0 1

Analysis by Chiron 1.1 64bit LP:

1.c4+ Kxc4 2.Be2+ Kxd4 3.Bxa6 axb2 4.Kc2 Ra7 5.Bxa5 Rxa6 6.exf6 exf6

-+ (-7.36) Depth: 7/20 00:00:00 15kN

1.c4+ Kxc4 2.Be2+ Kxd4 3.Bxa6 axb2 4.Kc2 Ra7 5.Bxa5 Rxa6 6.exf6 exf6

-+ (-7.36) Depth: 8/24 00:00:00 37kN

1.c4+ Kxc4 2.Be2+ Kxd4 3.Bxa6 axb2 4.Kc2 Ra7 5.Bxa5 Rxa6 6.exf6 exf6

-+ (-7.36) Depth: 9/24 00:00:00 64kN

1.c4+ Kxc4 2.b3+ Kxd4 3.exf6 Bxd8 4.f7

-+ (-7.19 ++) Depth: 10/26 00:00:00 149kN

1.c4+ Kxc4 2.b3+ Kxd4 3.exf6 Bxd8 4.f7

-+ (-7.02 ++) Depth: 10/26 00:00:00 152kN

1.c4+ Kxc4 2.b3+ Kxd4 3.exf6 Bxd8 4.f7

-+ (-6.68 ++) Depth: 10/26 00:00:00 157kN

1.c4+ Kxc4 2.b3+ Kxd4 3.exf6 Ra8 4.Bxe7 gxf4 5.g5 d5 6.Kc2 Bd8 7.Bd6

-+ (-6.94) Depth: 10/26 00:00:00 174kN

1.c4+ Kxc4 2.b3+ Kxd4 3.exf6 Ra8 4.Bxe7 gxf4 5.g5 d5

-+ (-5.26 ++) Depth: 10/26 00:00:00 227kN

1.c4+ Kxc4 2.b3+ Kxd4 3.exf6 Ra8 4.Bxe7 gxf4 5.g5 d5

-+ (-4.05 ++) Depth: 10/26 00:00:00 227kN

1.c4+ Kxc4 2.b3+ Kxd4 3.exf6 Ra8 4.Bxe7 gxf4 5.g5 d5

-+ (-1.50 ++) Depth: 10/26 00:00:00 227kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1

= (0.00) Depth: 10/26 00:00:00 228kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1 Bc7

= (0.00) Depth: 11/26 00:00:00 229kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1 Bc7 9.Kc2

= (0.00) Depth: 12/30 00:00:00 235kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1 Bc7 9.Kc2 Bb8

= (0.00) Depth: 13/30 00:00:00 242kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1 Bc7 9.Kc2 Bb8 10.Kb1

= (0.00) Depth: 14/32 00:00:00 256kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1 Bc7 9.Kc2 Bb8 10.Kb1 Bc7

= (0.00) Depth: 15/32 00:00:00 275kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1 Bc7 9.Kc2 Bb8 10.Kb1 Bc7

= (0.00) Depth: 16/32 00:00:00 306kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1 Bc7 9.Kc2 Bb8 10.Kb1 Bc7

= (0.00) Depth: 17/36 00:00:00 353kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1 Bc7 9.Kc2 Bb8 10.Kb1 Bc7

= (0.00) Depth: 18/36 00:00:00 426kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1 Bc7 9.Kc2 Bb8 10.Kb1 Bc7

= (0.00) Depth: 19/36 00:00:00 522kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1 Bc7 9.Kc2 Bb8 10.Kb1 Bc7

= (0.00) Depth: 20/39 00:00:00 712kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1 Bc7 9.Kc2 Bb8 10.Kb1 Bc7

= (0.00) Depth: 21/39 00:00:00 963kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1 Bc7 9.Kc2 Bb8 10.Kb1 Bc7

= (0.00) Depth: 22/39 00:00:02 8685kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1 Bc7 9.Kc2 Bb8 10.Kb1 Bc7

= (0.00) Depth: 23/41 00:00:03 10794kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1 Bc7 9.Kc2 Bb8 10.Kb1 Bc7

= (0.00) Depth: 24/44 00:00:04 17199kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1 Bc7 9.Kc2 Bb8 10.Kb1 Bc7

= (0.00) Depth: 25/46 00:00:06 23133kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1 Bc7 9.Kc2 Bb8 10.Kb1 Bc7

= (0.00) Depth: 26/48 00:00:09 37470kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1 Bc7 9.Kc2 Bb8 10.Kb1 Bc7

= (0.00) Depth: 27/48 00:00:14 58399kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 6.f5 Ra8 7.Kc2 Bb6 8.Kb1 Bc7 9.Kc2 Bb8 10.Kb1 Bc7

= (0.00) Depth: 28/51 00:00:19 77863kN

(Prakash, Bhubaneswar 04.01.2012)

and this too...

New game

3B4/1r2p3/r2p1p2/bkp1P1p1/1p1P1PPp/p1P4P/PP1K4/3B4 w - - 0 1

Analysis by Deep Shredder 12 x64:

1.c4+ Kxc4 2.Be2+ Kxd4 3.Bxa6 axb2 4.Kc2 Ra7 5.Bxa5 Rxa6

-+ (-6.90) Depth: 7/13 00:00:00 31kN

1.c4+ Kxc4 2.Be2+ Kxd4 3.Bxa6 axb2 4.Kc2 Ra7 5.Bxa5 Rxa6 6.Bd8 dxe5 7.fxg5

-+ (-7.80) Depth: 8/19 00:00:00 50kN

1.exf6 bxc3+ 2.bxc3 exf6 3.Bxf6 gxf4 4.Be2+ c4 5.Bf3 Rh7 6.g5

-+ (-6.80) Depth: 8/27 00:00:00 278kN

1.exf6 bxc3+ 2.bxc3 exf6 3.Bxf6 gxf4 4.Be2+ c4 5.Bf3 Rh7 6.Bg5 Rf7 7.Bxh4

-+ (-6.32) Depth: 9/21 00:00:00 422kN

1.exf6 bxc3+ 2.bxc3 exf6 3.Bxf6 gxf4 4.Be2+ c4 5.Bf3 Rf7 6.Bg5 Rb6 7.Bxh4

-+ (-6.51) Depth: 10/21 00:00:00 517kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kc8 6.f5 Kxd8 7.Kc2 Rba7 8.Kd3 Bb6 9.Kc2

=/+ (-0.29) Depth: 10/31 00:00:00 721kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kc8 6.f5 Kxd8 7.Kc2 Rba7 8.Kd3 Bb6 9.Kc2 Ke8 10.Kd3

=/+ (-0.29) Depth: 11/24 00:00:00 804kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kc8 6.f5 Kxd8 7.Kc2 Rba7 8.Kd3 Bb6 9.Kc2 Ke8 10.Kd3 Ra5

=/+ (-0.29) Depth: 12/20 00:00:00 845kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kc8 6.f5 Kxd8 7.Kc2 Rba7 8.Kd3 Bb6 9.Kc2 Ke8 10.Kd3 Ra5 11.Ke4

=/+ (-0.29) Depth: 13/28 00:00:00 895kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kc8 6.f5 Kxd8 7.Kc2 Rba7 8.Kd3 Bb6 9.Kc2 Ke8 10.Kd3 Ra5 11.Ke4 Ra8

=/+ (-0.29) Depth: 14/30 00:00:00 980kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kc8 6.f5 Kxd8 7.Kc2 Rba7 8.Kd3 Bb6 9.Kc2 Ke8 10.Kd3 Ra5 11.Ke4 Ra8 12.Kf3 Bc7

=/+ (-0.29) Depth: 15/28 00:00:00 1115kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kc8 6.f5 Kxd8 7.Kc2 Rba7 8.Kd3 Bb6 9.Kc2 Ke8 10.Kd3 Ra5 11.Ke4 Ra8 12.Kf3 Bc7 13.Ke2

=/+ (-0.29) Depth: 16/28 00:00:00 1407kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Ke8 6.f5 Bxd8 7.Kc2 Raa7 8.Kd2 Ra8 9.Ke3 Rba7 10.Kd3 Kf8 11.Ke3 Kg8 12.Ke4 Ra6 13.Ke3 Rb8 14.Kd3

=/+ (-0.29) Depth: 17/33 00:00:00 2051kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Ke8 6.f5 Bxd8 7.Kc2 Raa7 8.Kd2 Ra8 9.Ke3 Rba7 10.Kd3 Kf8 11.Ke3 Kg8 12.Ke4 Ra6 13.Ke3 Rb8 14.Kd3 Raa8

=/+ (-0.29) Depth: 18/35 00:00:00 2789kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Ke8 6.f5 Bxd8 7.Kc2 Raa7 8.Kd2 Ra8 9.Ke3 Rba7 10.Kd3 Kf8 11.Ke3 Kg8 12.Ke4 Ra6 13.Ke3 Rb8 14.Kd3 Raa8

=/+ (-0.29) Depth: 19/42 00:00:01 6428kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Ke8 6.f5 Bxd8 7.Kc2 Raa7 8.Kd2 Ra8 9.Ke3 Rba7 10.Kd3 Kf8 11.Ke3 Kg8 12.Ke4 Ra6 13.Ke3 Rb8 14.Kd3 Raa8

=/+ (-0.29) Depth: 20/41 00:00:02 10429kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kc8 6.f5 Rb8 7.Bc7 Bxc7 8.Kc2 Raa8 9.Kd3 Kb7 10.Ke2 Kb6 11.Kf3 Rc8 12.Ke2 Rg8 13.Ke3 Rab8 14.Kd3 Ka5

=/+ (-0.30) Depth: 21/45 00:00:04 18305kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kc8 6.f5 Rb8 7.Bc7 Bxc7 8.Kc2 Raa8 9.Kd3 Kb7 10.Ke2 Kb6 11.Kf3 Rc8 12.Ke2 Rg8 13.Ke3 Rab8 14.Kd3 Ka5

=/+ (-0.30) Depth: 22/45 00:00:10 40150kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kc8 6.f5 Rb8 7.Bc7 Bxc7 8.Kc2 Raa8 9.Kd3 Kb7 10.Ke2 Kb6 11.Kf3 Rc8 12.Ke2 Rg8 13.Ke3 Rab8 14.Kd3 Ka5

=/+ (-0.30) Depth: 23/49 00:00:15 61332kN

1.Ba4+ Kxa4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kc8 6.f5 Rb8 7.Bc7 Bxc7 8.Kc2 Raa8 9.Kd3 Kb7 10.Ke2 Kb6 11.Kf3 Rc8 12.Ke2 Rg8 13.Ke3 Rab8 14.Kd3 Ka5

=/+ (-0.30) Depth: 24/50 00:00:28 115mN

(Prakash, Bhubaneswar 04.01.2012)