Chess is 100% Tactics
Tactics
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Seeing a pattern at the end of a forced sequence is still pattern recogition just that its not 'in your face' . I would still suggest if you missed a tactical theme at the end of a short calculation 2-3 moves then its not fully memorized. Think of the smothered mate tactic or the classic bishop sac. I only calculate key ideas at the end of the critical forcing moves. What usually gets class players are intermediate moves. (at least those are what get me)
calculation is visualisation. aagaard has a good book on this also soltis how to choose a chess move talks about calculation and Nunn Practical chess secrets are very useful.
I think my main problem is that at the end of calculation, terrible tactics can sometimes show up unnoticed, as I showed in the puzzle below.
Chess starts with precise calculation and ends with it. If you can't finish the variations you are calculating in that situation; dont move it, or just let the game flow.