Author: Alexander Kure
Date: 12:19:26 04/28/02
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A "blue" move omly disables the move to be played but does not mark the position as non playable. Eg.: After 1 e4 c5 2 Nf3 e6 white should not play 3 Qe2. But in the variation 1 e4 e6 2 Qe2 c5 you want white to play Nf3 which would transpose to the same position. By marking 3 Qe2 of the first variation as "red" you also disable 3 Nf3 of variation 2 becaus it leads to the same position. By marking 3 Qe2 of the 1st variation as "blue" you do not disable 3 Nf3 of the 2nd variation. That's the magic ;-) Greetings Alex
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