MESON Chess Problem Database

Problem Display
PID: 261004 (7b/2p2Q2/1N2p3/4k1p1/1R2N3/r2B1pp1/p5r1/K3R1n1 w - - 0 1)

Boven, Dirk

Croes, Govert Aliander

Neue Zurcher Zeitung, 1972

7b/2p2Q2/1N2p3/4k1p1/1R2N3/r2B1pp1/p5r1/K3R1n1

#2

7 + 11

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Bf6
      • 2.Qxf6#
  • Tries
    • 1.Sc5+?
      • 1...Re2
        • 2.Qxe6#
      • 1...Se2
        • 2.Qxe6#
      • 1...Kd6+!
    • 1.Sxg5+?
      • 1...Re2
        • 2.Qxe6#
        • 2.Qf4#
      • 1...Se2
        • 2.Qxe6#
        • 2.Qf4#
      • 1...Kd6+!
    • 1.Sc4+?
      • 1...Kd4
        • 2.Qd7#
      • 1...Kd5+!
    • 1.Rb5+?
      • 1...Kd4
        • 2.Qd7#
      • 1...c5!
    • 1.Qxe6+?
      • 1...Kf4+
        • 2.Sf6#
      • 1...Kxe6+!
    • 1.Qg6?
      • threat
        • 2.Qxg5#
      • 1...Kf4+
        • 2.Sf6#
      • 1...Bf6
        • 2.Qxf6#
      • 1...g4
        • 2.Qg5#
      • 1...Sh3!
    • 1.Qf4+?
      • 1...Kxf4+
        • 2.Sf6#
      • 1...gxf4!
    • 1.Qg7+?
      • 1...Kf4
        • 2.Sd2#
        • 2.Sf2#
        • 2.Sc3#
        • 2.Sc5#
        • 2.Sxg5#
        • 2.Sd6#
        • 2.Sf6#
      • 1...Kf5
        • 2.Sc3#
        • 2.Sxg3#
        • 2.Sd6#
      • 1...Bxg7!
  • Keys
    • 1.Qe7!
      • threat
        • 2.Qxg5#
      • 1...Kf4+
        • 2.Sf6#
      • 1...Kf5+
        • 2.Sc3#
      • 1...Bf6
        • 2.Qxf6#
      • 1...Sh3
        • 2.Sf2#
      • 1...g4
        • 2.Qg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • B(k);N_GUARD::QAB1(G),XB(k)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • R(c);P_SPINR(c)::QAR1(G),XP(i)
        • S(a);P_SPINS(a)::QAR1(G),XP(i)
      • Refutation
        • K(g);CHECK,S_FLIGHT
    • Try
      • S(E);CHECK,XP(h)
      • Refutation
        • K(g);CHECK,S_FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • K(g);N_GUARD,S_FLIGHT::QAR(G)
      • Refutation
        • K(g);CHECK,P-FLIGHT,P_SPINP(i)
    • Try
      • R(D);CHECK
      • Vars
        • K(g);N_GUARD,S_CUTP(j),S_FLIGHT::QAR(G)
      • Refutation
        • P(j);P_SPINP(j)
    • Try
      • Q(G);CHECK,XP(i)
      • Vars
        • K(g);CHECK,S_FLIGHT::R(D)+S(E)
      • Refutation
        • K(g);CHECK,P-FLIGHT,XQ(G)
    • Try
      • Q(G);
      • Threat
        • QAR2(G),XP(h)
      • Vars
        • K(g);CHECK,N_GUARD,S_CUTR(c),S_CUTS(a),S_FLIGHT::R(D)+S(E)
        • B(k);N_GUARD::QAB1(G),XB(k)
        • P(h);::QAR2(G)
      • Refutation
        • S(a);
    • Try
      • Q(G);CHECK
      • Vars
        • K(g);CHECK,S_FLIGHT,XQ(G)::R(D)+S(E)
      • Refutation
        • P(h);XQ(G)
    • Try
      • Q(G);CHECK
      • Refutation
        • B(k);XQ(G)
  • Actual
    • Q(G);P_PINP(i)
    • Threat
      • QAR2(G),XP(h)
    • Vars
      • K(g);CHECK,N_SPINP(i),S_CUTR(c),S_CUTS(a),S_FLIGHT::R(D)+S(E)
      • K(g);CHECK,N_SPINP(i),P-FLIGHT,S_CUTR(c),S_CUTS(a)::B(C)+S(E)
      • B(k);N_GUARD::QAB1(G),XB(k)
      • S(a);N_GUARD::R(B)+S(E)
      • P(h);::QAR2(G)
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