"Okay, that's all for the off-topic, now let's start the lecture." Everything that should be said was said, Yuan Lang officially started the class, turned around, hung a roll of paper on the wall, and then unfolded the paper after hanging, and painted a schematic diagram of a nineteen-way chessboard.

"Before learning chess, we must first understand the chess set, which is divided into a chessboard and a chess piece, let's talk about the chessboard first." Holding the whip, Yuan Lang pointed to the chessboard diagram.

The surface of the chessboard is composed of nineteen lines in the vertical and horizontal directions, constituting three hundred and sixty-one intersections, each line on the chessboard is called 'road', the outermost one is called the first road, the middle is called the second road, the third road and the ninth road, and the middle point is called 'Tianyuan'. In addition to the Tian Yuan, there are eight other dots on the four corners and sides of the chessboard, called 'stars', to mark the position. ”

"The chess pieces of Go are divided into black and white, which means yin and yang, of which there are 181 black pieces and 180 white pieces, and the total number matches the number of intersection points on the board, but under normal circumstances, the number of pieces in each deck is not necessarily accurate to that extent, because it is impossible to use up all the pieces in actual chess.

The chess pieces are placed on the intersection of the chessboard, the black player is the first to play the game, the other side is white and the other side is white, and the two sides take turns to play until there is no point on the chessboard, and the chess pieces are not allowed to move the position after falling, unless they are raised.

"The survival of the chess pieces is determined by 'qi'. Qi' is one of the basic terms of Go, which refers to the empty intersection point on the board that is immediately adjacent to the piece, in the middle of the board there are four such points, if the piece is on the sideline all the way, there are three such points, and on the corner, there are two. The so-called 'qi is exhausted', if all the 'qi' around the chess pieces has been occupied by the opponent's chess pieces, then the chess pieces will be taken away from the chessboard, and so on, two, three or more than a dozen or even dozens of pieces are the same, as long as the 'qi' next to these chess pieces are occupied by the opponent, then these chess pieces must be removed.

According to the basic rules of Go, the 'qi' of the chess pieces is the condition for the survival of the chess pieces on the chessboard, as long as a chess piece has qi, it can not be lifted, therefore, when a chess piece can survive in the chessboard forever as long as there are two 'eyes', all the chess pieces belonging to this piece belong to the 'living piece', this is because' There is only one vacant space in the eye, and if the opponent's chess piece cannot be removed from the chessboard, then the chess piece will be taken away, and a piece of chess has two 'eyes', that is to say, the opponent has no way to occupy these two 'eyes' at the same time, because everyone can only play the next move in a round, so this chess is a live chess, the so-called 'two eyes live, one eye dead'".

Using the chessboard on the wall as a demonstration, Yuan Lang explained the basic knowledge of the rules of Go to the elementary school students and 'college students' in the classroom in detail, and the adults and children under the podium listened attentively, not wanting to miss any of the sentences.

The rules of Go are not complicated, after explaining the basic rules, Yuan Lang asked the students to start playing in pairs, and after taking a sip of tea, he also came to the lower side to patrol the field to correct or explain the students' conceptual ambiguities.

"Teacher, where should I take the first step?" Someone asked.

"As long as you follow the basic rules, you can play any point on the board, and as for where it is best, that's what we'll talk about tomorrow. Today I just taught you the rules of chess. Yuan Lang replied.

"Teacher, a chess game with two eyes is a live chess, but what about a chess game with three eyes?" Another question was raised.

"Two eyes are alive, and three eyes are dead? Why don't you grow your brains! Yuan Lang snorted.

"Teacher, when will I finish playing chess after mentioning it like this?" Someone else asked.

"This situation is called 'robbery', which is a special case in the rules of Go, similar to this situation, the party who is being lifted cannot immediately take the piece back, must first take a step elsewhere, this is called 'looking for robbery', the other party can only be withdrawn after responding, this is called 'robbery', the other party should not continue to play chess in the place of robbery, this is called 'eliminating robbery'." Yuan Lang explained.

"Teacher!"

"Teacher!"

The questions are one after another, and Yuan Lang is very busy, but fortunately, they are all very simple questions, which can be explained clearly in a few sentences.

"It's so simple to play chess, hehe, speaking of which, it seems that I'm better than you at playing this, right?" In the game, Lin Lao Wu ate Tian Dayi's five chess pieces, lifted the chess pieces from the chessboard, and Lin Lao Wu smiled proudly.

"Cut, what's the matter, hurry up, don't talk nonsense!" Tian Dayi snorted, his eyes staring at the chessboard urging - although he was an adult, he was even more involved in playing chess than a child, fighting chess and fighting mouths, which was more lively than any pair of opponents in the classroom.

"Teacher!" Someone asked Yuan Lang for help, and when he looked back, it turned out to be Chen Lihong, and it was Tan Xiaotian who was sitting in front of him to fight against him.

"What's the matter?" Yuan Lang asked as he walked over.

"Teacher, didn't you say that a chess game with two eyes is a living chess? But I have two eyes in this chess, and every day I say that my chess is dead? Chen Lihong complained.

"Uh, really?" Yuan Lang was slightly stunned when he heard this--after letting the students start the actual combat experience, this was probably the only problem with a little technical content.

Lowering his head and glancing at it, Yuan Lang knew what the situation was, but he didn't answer the question immediately, but instead looked at Tan Xiaotian's face, "Tiantian, why do you think this chess piece is a dead chess?" He asked softly.

"Well, you just said 'the qi is exhausted', when you drop a piece so that the opponent's chess pieces are all around the qi, you can remove the opponent's chess pieces, although Brother Lihong has two eyes, but both sides of this eye are stuck by my chess pieces, and when the outside of the gas is full, you can remove these five chess pieces after putting a piece in this eye, then this chess piece is not two eyes." Tan Xiaotian explained with his little hand pointing on the chessboard.

"Who taught you this?" Yuan Lang then asked, although he tried to maintain a flat tone, his breathing was unconsciously accelerating.

"Uh" Tan Xiaotian was stunned for a moment, blinking his big black and white eyes and looking at Yuan Lang puzzled-Aren't these things just taught by Teacher Yuan? Did he forget it all for a while?