MESON Chess Problem Database

Problem Display
PID: 74443 (5R2/1P6/8/1N2NP2/4pk1P/Q1p1R3/8/4K3 w - - 0 1)

Nadezhdin, Nikolai Dmitrievich

Shakhmaty (Riga), 1977

5R2/1P6/8/1N2NP2/4pk1P/Q1p1R3/8/4K3

#2

9 + 3

6136 Belarus Solving Championship 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe3
      • 2.Qc1#
    • 1...Kxe5
      • 2.Qd6#
  • Tries
    • 1.Kf1?
      • 1...Kxe3
        • 2.Qc1#
      • 1...Kxe5
        • 2.Qd6#
      • 1...c2!
    • 1.Ke2?
      • 1...Kxe5
        • 2.Qd6#
      • 1...c2!
    • 1.Kf2?
      • 1...Kxe5
        • 2.Qd6#
      • 1...c2!
    • 1.Sg6+?
      • 1...Kxe3
        • 2.Qxc3#
      • 1...Kg4!
    • 1.Rxc3?
      • 1...Kxe5
        • 2.Qd6#
      • 1...e3!
    • 1.Rf3+?
      • 1...Kxe5
        • 2.Qc5#
        • 2.Qd6#
      • 1...exf3!
    • 1.Rh3?
      • 1...Kxe5
        • 2.Qd6#
      • 1...c2
        • 2.Qg3#
      • 1...e3!
    • 1.Rf6?
      • 1...Kxe3
        • 2.Qc1#
      • 1...Kxe5
        • 2.Qd6#
      • 1...c2!
    • 1.Rf7?
      • 1...Kxe3
        • 2.Qc1#
      • 1...Kxe5
        • 2.Qd6#
      • 1...c2!
    • 1.Re8?
      • 1...Kxe3
        • 2.Qc1#
      • 1...Kxf5
        • 2.Qf8#
      • 1...c2!
    • 1.Qb4?
      • threat
        • 2.Qxe4#
      • 1...Kxe5
        • 2.Qd6#
        • 2.Qxe4#
      • 1...Kxe3!
    • 1.Qd6?
      • 1...Kxe3
        • 2.Qh6#
      • 1...c2!
    • 1.Qe7?
      • 1...Kxe3
        • 2.Qg5#
      • 1...c2!
    • 1.Qa2?
      • 1...Kxe3
        • 2.Qf2#
      • 1...Kxe5
        • 2.b8Q#
        • 2.b8B#
      • 1...c2!
    • 1.Qa4?
      • threat
        • 2.Qxe4#
      • 1...Kxe5
        • 2.Qxe4#
      • 1...Kxe3!
    • 1.Qa6?
      • 1...Kxe3
        • 2.Qh6#
      • 1...Kxe5
        • 2.Qd6#
      • 1...c2!
    • 1.b8Q?
      • 1...Kxe3
        • 2.Qc1#
      • 1...c2!
    • 1.b8S?
      • 1...Kxe3
        • 2.Qc1#
      • 1...Kxe5
        • 2.Qd6#
      • 1...c2!
    • 1.b8B?
      • 1...Kxe3
        • 2.Qc1#
      • 1...c2!
    • 1.b8R?
      • 1...Kxe3
        • 2.Qc1#
      • 1...Kxe5
        • 2.Qd6#
      • 1...c2!
  • Keys
    • 1.Sxc3!
      • 1...Kxe3
        • 2.Se2#
      • 1...Kxe5
        • 2.Rxe4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(c);OGATEB,P_SPINP(a),S_FLIGHT,XR(C)::QAB(B)
    • K(c);OGATEB,P_SPINP(b),S_FLIGHT,XS(F)::QAB1(B)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(c);OGATEB,P_SPINP(a),S_FLIGHT,XR(C)::QAB(B)
        • K(c);OGATEB,P_SPINP(b),S_FLIGHT,XS(F)::QAB1(B)
      • Refutation
        • P(a);
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(c);OGATEB,P_SPINP(b),S_FLIGHT,XS(F)::QAB1(B)
      • Refutation
        • P(a);
    • Try
      • K(A);S_FLIGHT
      • Vars
        • K(c);OGATEB,P_SPINP(b),S_FLIGHT,XS(F)::QAB1(B)
      • Refutation
        • P(a);
    • Try
      • S(F);CHECK
      • Vars
        • K(c);P_SPINP(a),S_FLIGHT,XR(C)::QAR2(B),XP(a)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • R(C);XP(a)
      • Vars
        • K(c);OGATEB,S_FLIGHT,XS(F)::QAB1(B)
      • Refutation
        • P(b);
    • Try
      • R(C);CHECK
      • Refutation
        • P(b);XR(C)
    • Try
      • R(C);
      • Vars
        • K(c);OGATEB,S_FLIGHT,XS(F)::QAB1(B)
        • P(a);OGATE::QAB1(B)
      • Refutation
        • P(b);
    • Try
      • R(I);
      • Vars
        • K(c);OGATEB,P_SPINP(a),S_FLIGHT,XR(C)::QAB(B)
        • K(c);OGATEB,P_SPINP(b),S_FLIGHT,XS(F)::QAB1(B)
      • Refutation
        • P(a);
    • Try
      • R(I);
      • Vars
        • K(c);OGATEB,P_SPINP(a),S_FLIGHT,XR(C)::QAB(B)
        • K(c);OGATEB,P_SPINP(b),S_FLIGHT,XS(F)::QAB1(B)
      • Refutation
        • P(a);
    • Try
      • R(I);
      • Vars
        • K(c);OGATEB,P_SPINP(a),S_FLIGHT,XR(C)::QAB(B)
        • K(c);OGATEB,P-FLIGHT,XP(G)::QAR(B)
      • Refutation
        • P(a);
    • Try
      • Q(B);P_PINP(b)
      • Threat
        • QAR1(B),XP(b)
      • Refutation
        • K(c);N_SPINP(b),S_FLIGHT,XR(C)
    • Try
      • Q(B);
      • Vars
        • K(c);S_FLIGHT,XR(C)::QAB(B)
      • Refutation
        • P(a);
    • Try
      • Q(B);
      • Vars
        • K(c);S_FLIGHT,XR(C)::QAB(B)
      • Refutation
        • P(a);
    • Try
      • Q(B);
      • Vars
        • K(c);S_FLIGHT,XR(C)::QAB1(B)
        • K(c);P_SPINP(b),S_FLIGHT,XS(F)::P=Q
      • Refutation
        • P(a);
    • Try
      • Q(B);P_PINP(b)
      • Threat
        • QAR1(B),XP(b)
      • Vars
        • K(c);S_FLIGHT,XS(F)::QAR1(B),XP(b)
      • Refutation
        • K(c);N_SPINP(b),S_FLIGHT,XR(C)
    • Try
      • Q(B);
      • Vars
        • K(c);S_FLIGHT,XR(C)::QAB(B)
        • K(c);OGATEB,P_SPINP(b),S_FLIGHT,XS(F)::QAB1(B)
      • Refutation
        • P(a);
    • Try
      • P(H);
      • Vars
        • K(c);OGATEB,P_SPINP(a),S_FLIGHT,XR(C)::QAB(B)
      • Refutation
        • P(a);
    • Try
      • P(H);
      • Vars
        • K(c);OGATEB,P_SPINP(a),S_FLIGHT,XR(C)::QAB(B)
        • K(c);OGATEB,P_SPINP(b),S_FLIGHT,XS(F)::QAB1(B)
      • Refutation
        • P(a);
    • Try
      • P(H);
      • Vars
        • K(c);OGATEB,P_SPINP(a),S_FLIGHT,XR(C)::QAB(B)
      • Refutation
        • P(a);
    • Try
      • P(H);
      • Vars
        • K(c);OGATEB,P_SPINP(a),S_FLIGHT,XR(C)::QAB(B)
        • K(c);OGATEB,P_SPINP(b),S_FLIGHT,XS(F)::QAB1(B)
      • Refutation
        • P(a);
  • Actual
    • S(E);XP(a)
    • Vars
      • K(c);S_FLIGHT,XR(C)::QAR(B)+S(E)
      • K(c);P_SPINP(b),S_FLIGHT,XS(F)::R1(C),XP(b)
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