Buy a some decent chess books, and chuck the Oxford dictionary (for chess at least).
Paul Littlewood, Chess Tactics, (1984). 150 pages of bite-sized exercises. You don't even need to set up the board, if you so choose.
Rhetoric doesn't win chess games. Sorry.
P.S. Definition #3 is a bad character reference. Ignore it.
You know when you've won!!
I know when I'm navel gazing. Some don't.
Was that navel gazing or nasal grazing? I've burn't my oxford.
lol, I like your enthusiasm zborg, yeah I was quite suspicious of the dictionary definition and have already refuted it from chess all together.
@Stevie, your Big Book still makes a good doorstop. Unless you needed it for heating.
Now yor thinking!
Like @Kenpo's writing?
Deceptively simple...Whilst knocking the top off your Jacob of a morning consider the day ahead..Will i ever be that good?..Does this mean i can multitask?..Wheres the toilet roll?...Am i lower level?
Don't forget the Moist Wipes. Very handy. 
Words can have different meanings in different contexts. In the context of chess, calculation has a specific meaning that has not been exactly covered by that dictionay entry.
Glad you clear that up. Thanks for the edification. We can all rest easier now.
Now that's all cleared up! i know because of the head ache created by reading about thinking. Trying to resolve----am i an upper or downer ?
Is it me? Or is there a certain irony about misspelling the very word that describes the good book that tells you how to spell correctly.
Eddy..Speak to your chemist.
Eagles Eyes. Ain't Nothing gets past @Stevie.
Thinking gets in the way of playing.
I guess line #11 is off the menu then.
How do you know you're thinking correctly in a game? How do you know that you're calculuting the way you're supposed to besides just visualizing the movements of the pieces to achieve a desire goal? According to my Oxford dictionary calculation means three things
1) The act or process of using numbers to find out an amount
2) The process of using judgment to decide what the results would be of doing sth
3) careful planning for yourself without caring about other people
Now, intuitively, I'd go for 3 here, what do you guys think?