Okay, from what I see, the hard ones for my mind to remember, is the 90°and the 150°.
I will now add imaginary pieces, which will combine known shapes - making it easier for us to remember these patterns:
let's call it the Bent-Square.
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Let's call it The Diamond. (or Diagonal-Diamond, or The Rhombus - which ever you're more related to)
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Now, what you get in real games, are half Bent-Squares, and half Diagonal-Diamonds. let your imagination do the rest for you.
* Don't worry because of the long scroll bar - this lesson is very short - all you do is watch diagrams - almost nothing to read here.
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I want to make a study about the horse - it's the most confusing piece, so I think that if we visualize it clearly enough, we can use it better; and avoid being attacked by it, better.
Let's see its forking options in a wall-clock (clock face) manner:
(The knight is the center of the clock, the king is the tip of the hour-hand - saying the hour is 1 or 13. the other black piece is the tip of the minute-hand - which is changing)
I've also added degrees - for the geometrical folks. (but I chose smaller degrees - 150 instead of 210. 90 instead of 270 - because smaller numbers are easier to remember)
Again, we all already know these forks, it's the visualization that counts - What do you remember more - you're friends' names or their faces? their faces, of course. we are very "graphical beings" aren't we?