#include <bits/stdc++.h>
using namespace std;

using ll = long long;

#define rep(i, n) for (int i=0; i<(int)(n); ++(i))
#define rep3(i, m, n) for (int i=(m); (i)<(int)(n); ++(i))
#define repr(i, n) for (int i=(int)(n)-1; (i)>=0; --(i))
#define rep3r(i, m, n) for (int i=(int)(n)-1; (i)>=(int)(m); --(i))
#define all(x) (x).begin(), (x).end()

const int INF = (int)(1e9);

int query(int a, int b) {
    ++a; ++b;
    cout << a << ' ' << b << endl;
    string s;
    cin >> s;
    if (s == (string)("Black")) return 1;
    else if (s == (string)("White")) return 0;
    else -1;
}

int main() {
    int n, m;
    cin >> n >> m;
    vector<vector<int>> b(n, vector<int>(n, -1));
    b[0][0] = b[n-1][n-1] = 1;
    queue<pair<int, int>> que;
    vector<vector<int>> dist(n, vector<int>(n, INF));
    int mcnt = 2;
    bool ok = false;
    que.emplace(0, 0);
    dist[0][0] = 0;
    while (!que.empty()) {
        auto p = que.front(); que.pop();
        int y = p.first, x = p.second, d = dist[y][x];
        const vector<int> dy = { -1, 0, 1, 0 }, dx = { 0, 1, 0, -1 };
        rep(i1, 4) {
            int ny = y + dy[i1], nx = x + dx[i1];
            if (ny<0 || ny>=n || nx<0 || nx>=n) continue;
            if (ny==n-1 && nx==n-1) {
                ok = true;
                break;
            }
            if (dist[ny][nx] <= d+1) continue;
            if (b[ny][nx] == -1) {
                if (mcnt >= m) break;
                int qres = query(ny, nx);
                if (qres == -1) exit(0);
                if (qres == 1) ++mcnt;
                b[ny][nx] = qres;
            }
            if (b[ny][nx] == 0) continue;
            if (b[ny][nx] == 1) {
                que.emplace(ny, nx);
                dist[ny][nx] = d + 1;
            }
        }
        if (ok || mcnt>=m) break;
    }
    if (ok) cout << "Yes" << endl;
    else cout << "No" << endl;
    return 0;
}