My 围棋(圍棋)weiqi(go) new ladder reading techinique
August 20, 2012 Leave a comment
I have my own ladder reading technique, that’s sometimes very useful to read the difficult ladders. There’s a go proverb “If you don’t know ladders, don’t play go”. And is very difficult to beginners get lost on the path of long ladders.
If you start a ladder with white stones in coordinates b16 and b17, all liberties surrounded except c17 (the lower-left corner is a1 and the upper left corner t19), this ladder path, if you alternate one point in one direction and other in another and do again the same movements, will end in d19. Now, the ladder not just progress toward the center of the board, it goes back to the near edge of the board, in our case, a16. Look, the same distance, 4 points, in a16 from a19 in the beginning of the ladder, and the 4 points to d19. This is not a coincidence; because of the symmetry, the ladders start and end on the same location.
Now, the long, difficult to read, ladders. If a ladder starts at c4 and c5, with the only liberty being d5, it is difficult to read its path because it is too long, and, since the center of the board is generally not populated in the beginning of the game for example, there is no point of reference and is easy get lost; this ladder will end in r19, 3points from the upper-left corner, the same 3 points (a3) from its path toward the edge of the board. If there is a stone for example in o17 is much simpler read the ladder c4 and c5 backwards to the point a3 and, once knowing there is a 3 spaces from a1, start a ladder going backwards from the three points from the upper-right point r19 (a straight line parallel to the diagonal of the board) and then see if o17 breaks the ladder (it breaks); it is easy because you have stones and references of the board as guides.