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How many moves needed to mate?

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27th March 2009, 10:41pm
#1
by yeres30
Waipahu, Hawaii United States
Member Since: Aug 2007
Member Points: 617

Here's a simple K+R vs. K endng. How many moves do you think is needed to get a mate with correct play by Black?

Please, do not be a spoil sport and reply with moves to support your answer.

Just GIVE THE NUMBER OF MOVES you have calculated to get a mate.

Please.

27th March 2009, 11:01pm
#2
by James1965
UAE Philippines
Member Since: Jan 2008
Member Points: 560

6 moves.1.Kb4,Kb8 2.Kc5,Kc8 3.Kd6,Kd8 4.Re4 ( Rook is more effective at least 3 square further from enemy king),Kc8 5.Rb4,Kd8 6.Rb8#.

27th March 2009, 11:04pm
#3
by NM tonydal
United States
Member Since: Oct 2007
Member Points: 4753

5.

27th March 2009, 11:08pm
#4
by RyanMK
Iowa United States
Member Since: Jun 2008
Member Points: 2277
tonydal wrote:

5.

 That's not right. The answer is 6.

27th March 2009, 11:12pm
#5
by NM tonydal
United States
Member Since: Oct 2007
Member Points: 4753

True enough--my mistake.

28th March 2009, 03:18pm
#6
by yeres30
Waipahu, Hawaii United States
Member Since: Aug 2007
Member Points: 617
james042665 wrote:

6 moves.1.Kb4,Kb8 2.Kc5,Kc8 3.Kd6,Kd8 4.Re4 ( Rook is more effective at least 3 square further from enemy king),Kc8 5.Rb4,Kd8 6.Rb8#.

Exactly. For those rated below 1200, the position after 3.Kd6 Kd8 would make one think of a mate in 5 or 6 more moves instead of only 3 after 4.Rh7 Ke8 5.Ra7 Kf8 6.Ke6 Kb8 7.Kf6 Ka8 8.Kg6 Kg8 9.Ra8#  or 4.Rh7 Kc8 5.Rg7 Kb8 6.Kc6 Ka8 7.Kb6 Kb8 8.Rg8#

29th March 2009, 05:27pm
#7
by victorxu
Rockville,MD United States
Member Since: Dec 2007
Member Points: 34

5

 
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