i have a couple of observations and suggestions

with regard to the nature and character of this puzzle

1 why not challenge me to checkmate black in under X number of moves

   and then let me go about my own tactical process

   instead of correcting every single move

   as though there is not more than one way to skin a cat

   it just might be possible that i have a quicker solution

   than the creator of the puzzel

2  why on earth should i exchange my pawn for a rook

   instead of a queen

   which the computer insisted was the "correct" move

   not allowing me the superior peice

   and a quicker end to the game

3  the puzzle itself was a good one

    but the computer format of this puzzel and others like it

    is stifling to rather than encouraging creativity

im still learning chess tactics but why wouldn't you turn the pawn into a queen?