Veptheca is an abstract strategy game for two or more players, which is played with pen and paper. The board of Veptheca is a arbitrary quad-board with dots. The minimal size is 3x3 points, but bigger is better, for more strategy. Of course, for more than two players, a bigger field must be used. Every player draws a vector on the field, with the following rules : 1. Orthogonal vector with length 1 (the distance between two neighbor dots in same line or column) with arbitrary direction, if the vector doesn't intersect any existing one. 2. Vector, which is a sum of two existing connected vectors with joint vertex in case : * is discreet (i.e. lies on two dots from the field); * doesn't intersect existing vector; * the joint vertex of the vectors, which sum is, is its vertex too; * lies in the sub-plane defined by the non-obtuse angle defined by the two vectors, which sum is it; * is not a result of two collinear vectors; The winner of the game is the player who makes the last possible move. The official game site (for rules and examples) is http://veptheca.tuzsuzov.com/