#include <stdio.h>

int main() {
	int Bx, By, Cx, Cy;
	scanf("%d %d %d %d", &Bx, &By, &Cx, &Cy);
	int A[Bx+1][By+1];
	for (int i = 0; i <= Bx; i++) {
		for (int j = 0; j <= By; j++) {
			A[i][j] = 0;
		}
	}
	A[Cx][Cy] = -1;
	
	int moves[8][2] = {
		{-2, -1}, {-1, -2}, {1, -2}, {2, -1},
		{2, 1}, {1, 2}, {-1, 2}, {-2, 1}
	};
	for (int i = 0; i < 8; i++) {
		int newX = Cx + moves[i][0];
		int newY = Cy + moves[i][1];
		if (newX >= 0 && newX <= Bx && newY >= 0 && newY <= By) {
			A[newX][newY] = -1;
		}
	}
	
	
	int dp[Bx+1][By+1];
	for (int i = 0; i <= Bx; i++) {
		for (int j = 0; j <= By; j++) {
			dp[i][j] = 0;
		}
	}
	dp[0][0] = 1;
	
	for (int i = 0; i <= Bx; i++) {
		for (int j = 0; j <= By; j++) {
			if (A[i][j] == 0) { 
				if (i > 0) dp[i][j] += dp[i-1][j]; 
				if (j > 0) dp[i][j] += dp[i][j-1]; 
			}
		}
	}
	
	printf("%d", dp[Bx][By]);

	return 0;
}

为什么第3、4个测试点没过QaQ，或者能告诉我这两个测试样例是什么吗