- 24 Nov '06 07:26 / 2 editsOn this one, I thought it would be fun to explain
*how*I solved it.

I considered**set play**(pretend White 'passes' on his first move, and fulfill the stipulation for as many Black defenses as possible).

1...Kd7 2.Qg4+ Kc6 [2...Kd8 3.Rf8#; 2...Ke8 3.Qc8#] 3.Qc8#

In other words, I don't need to take any special measures against 1...Kd7; I just ensure my Q has access to the c3-h8 diagonal. This frees me to devote all resources to defeating 1...Kb7.

If Black is allowed to play 1...Kb7 and 2...Ka7, White has difficulty constructing a mate. I want to play something like 2.Rf7+ to keep him out of a7. After this check, he either returns to c6 for 3.Rc7#, or gets nailed to an edge (2...Kb8 or 2...Ka6). To give mate against both of those, my Q must already be on a square that connects to both the 8th rank and the a-file. There is only one such square.

**1.Qd4!!**A great key move. Without the above logic, a very hard first move to find. In fact, all the defenses but one are known already. The only one left to consider is the acceptance of the sacrifice,**1...cxd4 2.Rf7!**Now possible because the stalemate is relieved.**2...Kc5**(or 2...d3)**3.Rc7#** - 24 Nov '06 09:31

Nice. That indeed is the answer.*Originally posted by BigDoggProblem***On this one, I thought it would be fun to explain**(pretend White 'passes' on his first move, and fulfill the stipulation for as many Black defenses as possible).*how*I solved it.

I considered [b]set play

1...Kd7 2.Qg4+ Kc6 [2...Kd8 3.Rf8#; 2...Ke8 3.Qc8#] 3.Qc8#

In other words, I don't need to take any special measures against 1... ...[text shortened]... [/b] Now possible because the stalemate is relieved.**2...Kc5**(or 2...d3)**3.Rc7#**[/b] - 25 Nov '06 13:26

I looked at this and got drove to frustration so much that I turned the computer off and went out on the drink.*Originally posted by BigDoggProblem***On this one, I thought it would be fun to explain**(pretend White 'passes' on his first move, and fulfill the stipulation for as many Black defenses as possible).*how*I solved it.

I considered [b]set play

1...Kd7 2.Qg4+ Kc6 [2...Kd8 3.Rf8#; 2...Ke8 3.Qc8#] 3.Qc8#

In other words, I don't need to take any special measures against 1... ...[text shortened]... [/b] Now possible because the stalemate is relieved.**2...Kc5**(or 2...d3)**3.Rc7#**[/b]

Now I'm looking at a computer screen with a little envy and a lot of hangover, oh and a strange woman with humongous knockers making tea...... alls not lost then eh?.....

so i say well done to Bigdogg for solving a tough one, and thanks to Kbaumen for getting me a new toy