It's two fold. (well three acually I enjoy doing it...would not do it if I did not.)
Find a instructive game and rip it pieces, poke about with it,
try this and that, find cute win, find nifty refutations, have fun with it.
I use games played by the lads on here to prove these combinations
and good shots are not the preserve of GM's. They are there infront of them.
Convincing weaker players to stop saying "I could never play a game like that."
is hard work.
And the bit about playing the winning move and stumbling. I've seen it so often.
I remember one of the first games I mangled. (Fischer - Dely. It's in the
notes to Game 58 Fischer - Geller. Fischer's 60.)
Here is the game. Answer the last question.
Fischer - Dely, Skopje, 1967
How many played 21.Bg5 Black just castles, there is no win.
I never forgot that note. I know I would have played the move in the hidden note.
I've played some dodgy and bad combo's in my time and gambled and lost
but I've never tossed a pure won game by blowing it at the critical stage.
I've won dozens of totally lost games quite a few them when my opponent was
playing what they thought was the killer move.
Something happens to a player when they have a win in their mind and not
on the board. I cannot say exactly what it is (as I said I've never done it.)
But be aware, and I have 100's of examples, that this a very vulnerable moment.
I owe that one game and it's one note quite a lot.
(Infact not quite true I recall playing a mate and it was not mate in an allegro game
Luckily my position was that good I still won. But for a few moments I thought I
had blown it.)
The move that wins in the Fischer game.
21Bb6 is one way to win this was shown to Fischer by Dely after the game.