A little glimpse of the situation formed by Xu Naiji in the 1974 National Chengdu Chess Tournament and Yang Guanxuan's entry into the 21st round of black cannon 2 flat 9, it is not difficult to find that Yang Guanxuan's understanding of the disk surface is three points.
The horned car was already at the gun port, and the cannon was moved to offer the 2nd car, which was really a god, which shocked the audience. Yang Guanxuan had a unique vision and incisively analyzed the following characteristics of the situation:
(1) The black side has one more son, but the horn car cannot escape when attacked;
(2) The black car cannon suppresses the red bottom car, but is correspondingly locked by it;
(3) The red right wing air defense is an excellent attack direction for the black side, but the firepower of the horse artillery is not enough to pose a threat to the red side;
(4) The horse cannon of the black side is in an excellent position, and the pawn riding the river lurks with a strong blockade force. Combining these, the black side adopted the decision to abandon the double car and concentrate the firepower of the horse and double artillery to attack the city.
Hong Fang thought about it for a long time and felt that he had to eat the car.
22. The car eight into two, the cannon 9 into 1.
23. Four into five, horses 7 into 9.
24. Horse six into four...
The black side attacked strongly, and the red side had to abandon its horse and urgently dispatch seven-way vehicles to reinforce the right wing. If you mistakenly go to Shuai Wuping four, then the horse 9 into 7, Shuai four into one, Ma 7 back 8, Shuai four into one, cannon 9 back 2, the red double car is far away from the inside can not return to defense, black quick victory.
24....... Car 4 flat 6.
25. Cannon six flat five, soldier 5 retreat 4.
26. Car seven flat five, taxi 6 into 5.
27. Car five flat two, will 5 flat 6.
28. Shi five into four, Ma 9 into 7.
29. Car two back six, car 6 flat 8.
Catch the red car, and the black multi-son wins. The following red side can not take the car two flat one to eat the cannon, because the black arima 7 retreat 6 killed.
