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Thanks to fwhoberg for suggesting this problem for tactics trainer in http://www.chess.com/forum/view/more-puzzles/puzzles-needed-for-tactics-trainer?page=38

got the first three but didn't see Rh3!! incredibly difficult problem

Very tough, but good fun.

great one... congrats fredrich

who's fredrich?

http://www.chess.com/members/view/fwhoberg

the one who suggested this.. he first asked me if i can solve it.. but i couldnt.. then posted in Royal chess (http://www.chess.com/groups/home/royalchess). but none of our members were able to solve it. then we knew it is such a precious tactic.. then as per jaidev's suggestion requested to add to tactics trainer..

his name is friedrich!!!

dont worry... I call him many names....

and proud to say that he is my friend!

haha

glad you guys enjoyed it will post some more soon 

friedrich!!!

yes my  name is Friedrich but , my  friends call me Fredie would you to play a game with me?

fredie!!!

It is difficult problem because Rh3!! sac is required after rather obvious moves. Since its pass rate is only 16% I think it should be ranked higher than 2500

yeah dr of oz, it will be in time. it's already at 2584

Very happy to say that I saw ...Rh3 before playing ...f5+. Plus, I kicked it down from 2600 to 2591!

Good puzzle.

Thankyou very much.

Pass rate is still

 17.2%!

Seems like 31/180.

hei did you made it on first attempt?