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박우전(Woo-Jun PARK) 한국정보기술학회 2009 한국정보기술학회논문지 Vol.7 No.4
This study defines the greater than relation between two areas and the order of an area in on-board pattern which consists of four areas: west, north, east, and south. By using the defined relation and the order, the 75 order-sequences for four areas are calculated, and the order of adjacent two areas on the board is defined. In addition, we define a pattern which can be a representative of four types of equivalent on-board patterns in a same situation of go games - a given pattern, a pattern after rotating the given pattern 90 degrees clockwise, a pattern after rotating the given pattern 180 degrees clockwise, and a pattern after rotating the given pattern 270 degrees clockwise - called east-north oriented representative on-board pattern by using the order of adjacent two areas and the order of an area. Then, we describe and implement the method on how to transform from the equivalent four to the representative one. Also, we briefly discuss applications of representative on-board pattern.
박우전(Woo-Jun PARK) 한국정보기술학회 2012 한국정보기술학회논문지 Vol.10 No.2
Go players select a next move depending on the given on-board pattern(OBP) that shows how black and white stones are located on the go-board. In this study, we define a new on-board pattern which is different from the existing one, and propose a new representative on-board pattern(ROBP) - northeast-oriented ROBP. The new on-board pattern not only has a simpler structure but also enables easier implementation of OBP-related operations such as the computation of ROBP than the existing pattern does. We compute OBP and representative OBP at every move from two joseki (opening sequences of moves ) files and two game-record files by using the existing and the new definition respectively. We also observe the number of changes in the order sequence of four areas from those files, and show that new OBP gives less number of changes in the order sequence.