2. There are two kinds of line opening: straight line opening and diagonal line opening. This is conducive to our long-range chess pieces (back, car, elephant) going straight into the hinterland of the other side, taking the opportunity to attack the king or attack the weak soldiers of the other side, such as solitary soldiers, overlapping soldiers, soldiers behind the half-bright line, etc. But we must effectively control the open line. And the other party will definitely compete with you for control of the open line. If it cannot be effectively controlled, it will only lead to a lot of confrontation between the two sides and enter the endgame ahead of schedule.

The seventh horizontal line is the horizontal line where each soldier is located, which is often the root of his own soldiers. Once controlled by the other car, the king's activities are limited and the pressure is great. He will be killed at any moment, and his root soldiers will be attacked. Once the root soldiers are eaten, it is likely to cause the destruction or even collapse of their own soldiers, leading to the defeat of the chess game.

3. Any image with the same color as the grid where the main soldier chain is located is called a bad image, because its activity range is limited by its own soldier chain. There are two kinds of bad images: the bad image in the chain of soldiers and the bad image outside the chain of soldiers. Color grids are called weak grids. The former can't attack each other because of its small scope of activities, and its value is greatly reduced, while the latter is not necessarily. Because it can attack each other, if it occupies a strong point, the situation is not bad. The score of bad image should be reduced appropriately. In contrast, another color grid is a strong grid, and the image of another color grid is called as if.

The lightning in the picture is a white elephant: H7+, which means you will eat the black queen.