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Up Topic The Rybka Lounge / Chess / Combinations with short castling
- - By Felix Kling (Gold) [de] Date 2007-02-02 11:20
I wanted to create a position where short castling wins, this is the result:

3n1k1r/3Pp1p1/8/4b3/2B5/4P3/3P2PN/4K2R b K - 0 1


Why isn't Rxh2 a good move?

1. ... Rxh2 2.0-0! and after 2. ... Bf6 3.Kxh2 wins

And
1. ... Bxh2 doesn't work because of 2.Rf1 Bf4 3.Rxf4 Nf7 4.e8R/e8Q#

I've never seen such a combination before (where short castling is the only winning move and it's not a mate), does anyone know other combiantions with this motive?
Parent - - By sam_i_am (**) Date 2007-02-02 12:40 Edited 2007-02-02 13:00
interesting position.. Here's what winfinder has to say about it:

Rybka WinFinder 2.2 32-bit
3n1k1r/3Pp1p1/8/4b3/2B5/4P3/3P2PN/4K2R b K - 0 1


Analysis by Rybka WinFinder 2.2 32-bit:

1...Bxh2 2.Rf1+ Bf4 3.Rxf4+ Nf7 4.d8Q#
  +-  (#18)   Depth: 1   00:00:00
1...Bg3+
  ±  (1.00)   Depth: 4   00:00:00
1...Bg3+ 2.Ke2
  ±  (1.10)   Depth: 5   00:00:00
1...Bg3+ 2.Ke2 e6
  ±  (1.00)   Depth: 6   00:00:00  1kN
1...Bg3+ 2.Ke2 e6 3.Rf1+ Ke7
  ±  (1.00)   Depth: 7   00:00:00  2kN
1...Bg3+ 2.Ke2 e6 3.Rf1+ Ke7 4.Ng4
  ±  (0.90)   Depth: 8   00:00:00  4kN
1...Bg3+ 2.Ke2 e6 3.Rf1+ Ke7 4.Ng4 Kxd7
  ±  (0.90)   Depth: 9   00:00:00  7kN
1...Bg3+ 2.Ke2 e6 3.Rf1+ Ke7 4.Ng4 Kxd7 5.Bb5+ Kc7
  ±  (0.90)   Depth: 10   00:00:00  14kN
1...Bg3+ 2.Ke2 e6 3.Rf1+ Ke7 4.Ng4 Kxd7 5.Bb5+ Kc7 6.Bd3
  ±  (0.90)   Depth: 11   00:00:01  24kN
1...Bg3+ 2.Ke2 e6 3.Rf1+ Ke7 4.Ng4 Kxd7 5.Bb5+ Kc7 6.Bd3 Rh5
  ±  (0.90)   Depth: 12   00:00:01  39kN
1...Bg3+ 2.Ke2 e6 3.Rf1+ Ke7 4.Nf3 Kxd7 5.Ra1 Bc7 6.Ra7 Rh5 7.Bb3
  ±  (1.10)   Depth: 13   00:00:03  146kN
1...Bg3+ 2.Ke2 e6 3.Rf1+ Ke7 4.Nf3 Kxd7 5.Ra1 Bc7 6.Ra7 Rh5 7.Bb3
  ±  (1.10)   Depth: 14   00:00:04  193kN
1...Bg3+ 2.Ke2 e6 3.Rf1+ Ke7 4.Nf3 Kxd7 5.Ra1 Bc7 6.Ra7 Rh5 7.Bb3 g6
  ±  (1.10)   Depth: 15   00:00:06  274kN
1...Bg3+ 2.Ke2 e6 3.Rf1+ Ke7 4.Nf3 Kxd7 5.Ra1 Bc7 6.Ra7 Rh5 7.d4 Kc6 8.Kd3
  ±  (1.10)   Depth: 16   00:00:10  456kN
1...Bg3+ 2.Ke2 e6 3.Rf1+ Ke7 4.Nf3 Kxd7 5.Ra1 Bc7 6.Ra7 Rh5 7.d4 Kc6 8.Kd3
  ±  (1.10)   Depth: 17   00:00:16  722kN
1...Bg3+ 2.Ke2 e6 3.Rf1+ Ke7 4.Nf3 Kxd7 5.Ra1 Bc7 6.Ra7 Rh5 7.d4 Kc6 8.Kd3
  ±  (1.10)   Depth: 18   00:00:29  1328kN
1...Bg3+ 2.Ke2 e6 3.Rf1+ Ke7 4.Nf3 Kxd7 5.Ra1 Bc7 6.d4 Rh5 7.g4 Ra5 8.Rh1
  ±  (1.10)   Depth: 19   00:00:58  2694kN
1...Bg3+ 2.Ke2 e6 3.Rf1+ Ke7 4.Nf3 Rh5 5.Nd4 Kxd7 6.Ra1 Rc5 7.Kd3 Be5 8.Ra7+
  ±  (1.00)   Depth: 20   00:02:31  7097kN
1...Bg3+ 2.Ke2 e6 3.Rf1+ Ke7 4.Nf3 Rh5 5.Nd4 Kxd7 6.Ra1 Rc5 7.Kd3 Be5 8.Ra7+
  ±  (1.00)   Depth: 21   00:03:41  10402kN
1...Bg3+ 2.Ke2 e6 3.Rf1+ Ke7 4.Nf3 Rh5 5.Nd4 Kxd7 6.Ra1 Rc5 7.Kd3 Be5 8.Ra7+
  ±  (1.00)   Depth: 22   00:06:03  17127kN
1...Bg3+ 2.Ke2 e6 3.Rf1+ Ke7 4.Nf3 Rh5 5.Nd4 Kxd7 6.Ra1 Rc5 7.Kd3 Be5 8.Ra7+
  ±  (1.00)   Depth: 23   00:10:15  29200kN

(,  02.02.2007)

Black is just screwed any way you look at it and it would't really matter if you did a 3 hour analysis for some sissy move :P, white is gonna win.
But not by castling..
Parent - - By sam_i_am (**) Date 2007-02-02 13:01
I have to admit that I too was blind to black's Bg3+
Parent - - By Felix Kling (Gold) [de] Date 2007-02-02 13:35 Edited 2007-02-02 13:51
The combination was after Rxh2 :), in the diagram there is no combination after Bg3 of course :D

here's the diagram with the (simple) combination:
3n1k2/3Pp1p1/8/4b3/2B5/4P3/3P2Pr/4K2R w K - 0 2


Maybe I can create a position where Rxh2 is black's best try...

3n1k1r/3Pp1p1/8/4b3/2B5/4P3/3P2PQ/4K2R b K - 0 1


Now it's forced to take on h2 :)

r2n1k2/3Pp1p1/8/4b2r/2q5/1B6/3P2PQ/3RK2R w K - 0 1


Bxc4 Rxh2 0-0!
Parent - - By Felix Kling (Gold) [de] Date 2007-02-02 14:33 Edited 2007-02-02 14:53
3n1k2/2bPpNpr/b3B1p1/8/2qN4/4P3/1PPP2PQ/r2NK2R w K - 0 1


Now it's really complicated :)
1.Ne5 Bxe5 (Rxh2? Nxg6#) 2.Bxc4 Rxh2 3.0-0! with a winning position.

Note that a move like 1.b3 loses because of Bg3! Qxg3 Rxh1 Kf2 Rf1 mate.

other version to avoid Bxc4 (which could be a draw in the first diagram):
n2n1k2/2bPpNpr/b3B1p1/8/2qN4/4P3/1PPP2PQ/r2NK2R w K - 0 1


1. Ne5 Bxe5 2. Bxc4 Rxh2 3. O-O+ Bf6 4. Ne6+ Kg8 5. Nxd8+ Bxc4
6. Ne6 Rh8 7. d8=Q+ Kh7 8. Nf8+ Rxf8 9. Qxf8 Bxf1 10. Kxf1 Rxd1+ 11. Ke2 with a winning position
Parent - By sam_i_am (**) Date 2007-02-02 15:46
F.Kling wrote:
"The combination was after Rxh2 , in the diagram there is no combination after Bg3 of course :D"

yes but it was slowed down by Bg3+ :P RookxH2 is worse
Parent - By sam_i_am (**) Date 2007-02-02 15:49
Your quite the sadist I must say. Whips-n-chains chess !
Up Topic The Rybka Lounge / Chess / Combinations with short castling

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