Mating with KQ vs. KR

During the last weeks I've been training the intimidating Q vs. R mate, and yes, it's every bit as hard as it's said to be. Maybe even more so.

So why is it so hard? Well, to begin with, there isn't any clear cut single technique to it like in the KNB for example, which btw. seems like a walk in the park in comparison. Instead you need to learn a bunch of typical positions, learn the ins & outs of them, then recognize similarities on the board and jump from one technique to another, in a way which seems quite random. And with a bit of luck, you'll manage to fumble your way into a forced winning of the rook.

Basically, you'll need to drill it over and over with fritz, build up a huge repository of typical maneuvers, and sort of feel your way through it. I think I've got it down fairly well now, as I can win it from random positions against tablebase most of the times. But I still don't know half of the time how I got into a 'familiar position', or why I suddenly dropped off from the beaten path. I just make moves which seem 'reasonable', and somehow end into some recognizable position eventually. So there's still lots of ground to cover, but I'm starting to get there. In slow games I think I can pull it off, but blitz is still out of the question, at least against tablebase. Agains fritz without tablebase I can blitz it, but mostly because fritz plays it very similarly every time.

I'll try to write some kind of a real tutorial at some point, but there's so much material to cover it'll take some time. And also my knowledge about it isn't really focused enough to put it into words yet either.

But anyway, here's an example against the ICC KQkr bot:

[Event "ICC"]
[Date "2008.08.03"]
[White "wormwood"]
[Black "KQkr"]
[Result "1-0"]
[WhiteElo "1329"]
[BlackElo "2200"]
[TimeControl "300+12"]
[FEN "8/7k/8/8/6Q1/8/r1K5/8 w - - 0 1"]

1. Kb3 Ra6 2. Qd7+ Kh6 3. Kc4 Rf6 4. Kd5 Kg5 5. Ke5 Rf2 6. Qg7+ Kh4 7. Qg6 Rf3 8. Ke4 Rf2 9. Qd6 Kg4 10. Qd1+ Kg3 11. Qg1+ Rg2 12. Qe3+ Kh2 13. Kf4 Rg7 14. Qe5 Rg3 15. Qd6 Kh3 16. Qe6+ Kh2 17. Qe5 Rg2 18. Kf3+ Kg1 19. Qa1+ Kh2 20. Qe1 Ra2 21. Qe5+ Kg1 22. Qd4+ Kh1 23. Qh8+ Kg1 24. Qg8+ Kh2 25. Qxa2+ Kh3 26. Qg2+ Kh4 27. Qg4# 1-0

(2008.08.03 - Updated the above example to a new, more streamlined one. This one I managed in a little over a minute against a tablebase. Getting pretty close to being able to blitz it.)

The basic idea is to force the defender in zugzwang, so that he'll have to separate the rook from the king. After which the rook should drop fairly soon. Checks are usually just tools to get into a zugzwang, and the most important (and hardest to see) moves come without a check. Up to a point where you start looking for non-checking moves for candidates rather than those familiar checks. But naturally there are some extremely important checks as well.

I doubt any of this makes much sense without diagrams and specific variations, but hopefully I'll get to that some day.