I question whether the tactics server is "honest" I have runs of great performance where I am in the 1300's for a week and runs where I fall back into the 1100's. The scoring just seems to get tougher and the puzzles more ... intricate. It seems unlikely that my performance is varying that much. I don't have bursts of genius and moronic plunges in any other domain of my life. I wonder if perhaps we might start a discussion under the heading, Is the Tactics Server Honest?, and put our heads together to see what is going on. By the way, MICKINMD, where did you get that splendid performance summary you posted?
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I think a blunder is not a good example of the problem I'm referring to. Sometimes (often enough) I simply screw up and those cases are uninteresting for this discussion. Sometimes I can see how things need to turn out and simply don't calculate well enough (moves out of order/insufficiently forcing) and practice will eventually help with that. Sometimes however, like exchanging a queen for two rooks a few days ago, I wonder why on earth its a good idea. The tactics exercises just present those as something to accept. Now you could find that one and explain it to me, but that doesn't deal with the underlying problem - there will be another like that soon enough.
I think you are talking about this game. The puzzle must start after black move Ke7.
Then your moves should be. 1. Re1+ Re6 (or 1....Qe6 2. Rxe6+ 3. Rxe6, or 1. ..Kf6 2. Re6+ Rxe6 3. Qxe6+ checkmate ) 2. Rxe6+ Qxe6 3. Qxe6+ Kf8(3... Ke7 4. Qxe7+mate ) 4. Nh7+mate should be the solution. If you do alternative moves, you wont get mate in 4 anymore.