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Subject: Re: This one must be nearly impossible!

Author: George Tsavdaris

Date: 04:31:20 10/18/03

Go up one level in this thread

On October 18, 2003 at 07:19:09, Darren Rushton wrote:

>[D]qn6/rp1p4/pPkP1R2/K7/2P5/B1pP4/2P1P3/8 w - - 0 1
>
>Y. G. Vladimirov
>1st Prize Macleod Memorial Tourney 1994
>
>Forced mate in 17!
>
>An amusing problem illustrating the use of pendulum manoeuvres and interferences
>to reposition pieces.
>
>White would like to play Rf8 and Rc8 mate, but must avoid giving stalemate. By
>allowing the king to shuttle between c5 and c6 and checking every second move
>(otherwise Nc6+ frees the Black forces) White is able to reposition his bishop
>at g1 and e2 pawn at e5 to allow the rook to reach f8 via a discovered check.
>
>The solution is worth close study.
>1.Bc1 Kc5 2.Be3+ Kc6 3.Bf4 Kc5 4.Rf5+ Kc6 (If 4…Kd4 5.Rd5 mate) 5.Be5 Kc5 6.Bh2+
>Kc6 (If 6…Kd4 7.Bg1 mate) 7.Rf6 Kc5 8.Bg1+ Kc6 9.e3 Kc5 10.e4+ Kc6 11.Bh2 Kc5
>12.Rf5+ Kc6 (If 12…Kd4 13.Bg1 mate) 13.e5 Kc5 14.Bg1+ Kc6 15.Rf2 Kc5 16.Rf8+ Kc6
>17.Rc8 mate.
>
>Can a program find it?
>
Chessmaster 9000 XXX (a personality of mine), can find the move in 37 seconds
on a PIV 1500MHz with 32MB hash. I'm sure default CM9000 can find it also very
quick.

CM9000 XXX analysis:

Time	Depth	Score	Positions	Moves
0:02	1/12	0.00	308409		1.e2-e3
0:04	1/13	0.00	649583		1.e2-e3
0:37	1/13	2.74	5804118		1.Ba3-c1 Kc6-c5 2.Bc1-e3+ Kc5-c6
					3.Be3-f4 Kc6-c5 4.Rf6-f5+ Kc5-c6
					5.Rf5-e5 Kc6xd6 6.Re5-e8+ Kd6-c5
					7.Bf4xb8 d7-d6 8.b6xa7 Kc5-c6 9.Re8-e7
					Kc6-c5 10.e2-e3 b7-b6+ 11.Ka5xa6
					Qa8-c6 12.d3-d4+ Kc5xc4 13.Bb8xd6
1:00	2/14	3.42	10096134	1.Ba3-c1 Kc6-c5 2.Bc1-e3+ Kc5-c6
					3.Be3-f4 Kc6-c5 4.Rf6-f5+ Kc5-c6
					5.Rf5-e5 Kc6xd6 6.Re5-e8+ Kd6-c5
					7.Bf4xb8 d7-d6 8.b6xa7 Kc5-c6 9.Re8-e7
					Kc6-c5 10.e2-e3 b7-b6+ 11.Ka5xa6
					Qa8-h1 12.Re7-d7 Qh1-a1+ 13.Ka6-b7
2:45	3/15	6.95	31299832	1.Ba3-c1 Kc6-c5 2.Bc1-e3+ Kc5-c6
					3.Be3-f4 Kc6-c5 4.Rf6-f5+ Kc5-c6
					5.Rf5-e5 Kc6xd6 6.Re5-e8+ Kd6-c5
					7.Bf4xb8 d7-d6 8.e2-e3 Kc5-c6 9.Re8-d8
					Qa8xb8 10.Rd8xb8 Ra7-a8 11.Rb8xa8
					Kc6-d7 12.Ra8-g8 Kd7-c6 13.Rg8-g7

• Re: This one must be nearly impossible! Kurt Utzinger 04:42:06 10/18/03
• Re: This one must be nearly impossible! George Tsavdaris 04:38:39 10/18/03
  • Re: This one must be nearly impossible! Darren Rushton 06:20:28 10/18/03

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