MESON Chess Problem Database

Problem Display
PID: 164814 (8/8/3K4/8/6RN/3pk2P/1Q2p3/8 w - - 0 1)

Berggren, G

Springaren, 1987

8/8/3K4/8/6RN/3pk2P/1Q2p3/8

#2

5 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...d2
      • 2.Qd4#
  • Tries
    • 1.Kd5?
      • 1...d2
        • 2.Qd4#
      • 1...e1Q
        • 2.Re4#
      • 1...e1S
        • 2.Re4#
      • 1...e1B
        • 2.Re4#
      • 1...e1R
        • 2.Re4#
      • 1...Kf2!
    • 1.Ke5?
      • 1...d2
        • 2.Qd4#
      • 1...e1Q
        • 2.Re4#
      • 1...e1S
        • 2.Re4#
      • 1...e1B
        • 2.Re4#
      • 1...e1R
        • 2.Rg3#
        • 2.Re4#
      • 1...Kf2!
    • 1.Sg2+?
      • 1...Kf3
        • 2.Qf6#
      • 1...Kf2!
    • 1.Rg2?
      • 1...Ke4
        • 2.Qe5#
      • 1...Kf4
        • 2.Qd4#
        • 2.Qe5#
      • 1...e1Q
        • 2.Qe5#
      • 1...e1S
        • 2.Qe5#
      • 1...e1B
        • 2.Qe5#
      • 1...e1R
        • 2.Qe5#
      • 1...d2!
    • 1.Rg3+?
      • 1...Ke4
        • 2.Qe5#
        • 2.Qb4#
      • 1...Kf4
        • 2.Qe5#
      • 1...Kf2!
    • 1.Re4+?
      • 1...Kxe4
        • 2.Qe5#
      • 1...Kf2!
    • 1.Qa1?
      • 1...Kf2
        • 2.Qg1#
      • 1...e1Q
        • 2.Qxe1#
      • 1...e1S
        • 2.Qxe1#
      • 1...e1B
        • 2.Qxe1#
      • 1...e1R
        • 2.Qxe1#
      • 1...d2
        • 2.Qd4#
      • 1...Kd2!
    • 1.Qc1+?
      • 1...Kf2
        • 2.Rg2#
        • 2.Qg1#
      • 1...d2!
    • 1.Qc3?
      • 1...e1Q
        • 2.Qxe1#
      • 1...e1S
        • 2.Qxe1#
      • 1...e1B
        • 2.Qxe1#
      • 1...e1R
        • 2.Qxe1#
      • 1...Kf2!
    • 1.Qb4?
      • threat
        • 2.Qf4#
      • 1...e1Q
        • 2.Qxe1#
      • 1...e1S
        • 2.Qxe1#
      • 1...e1B
        • 2.Qxe1#
      • 1...e1R
        • 2.Qxe1#
      • 1...d2
        • 2.Qd4#
      • 1...Kf2!
  • Keys
    • 1.Rf4!
      • threat
        • 2.Sg2#
      • 1...Kxf4
        • 2.Qe5#
      • 1...d2
        • 2.Qd4#
      • 1...e1S
        • 2.Qf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(b);::QAB1(A)
  • Tries
    • Try
      • K(E);P-FLIGHT
      • Vars
        • P(b);::QAB1(A)
        • P(a);::R1(C)
      • Refutation
        • K(c);P_SPINP(a),S_FLIGHT
    • Try
      • K(E);S_FLIGHT
      • Vars
        • P(b);::QAB1(A)
        • P(a);::R1(C)
      • Refutation
        • K(c);P_SPINP(a),S_FLIGHT
    • Try
      • S(D);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR(A)
      • Refutation
        • K(c);P_SPINP(a),S_FLIGHT
    • Try
      • R(C);
      • Vars
        • K(c);P-FLIGHT::QAR1(A)
        • P(a);::QAR2(A)
      • Refutation
        • P(b);
    • Try
      • R(C);CHECK
      • Vars
        • K(c);S_FLIGHT::QAB1(A)
      • Refutation
        • K(c);P_SPINP(a),S_FLIGHT
    • Try
      • R(C);CHECK
      • Vars
        • K(c);P-FLIGHT,XR(C)::QAR1(A)
      • Refutation
        • K(c);P_SPINP(a),S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(c);S_FLIGHT::QAB1(A)
        • P(a);OGATEB::QAR2(A),XQ(a)
        • P(a);OGATEB::QAR2(A),XS(a)
        • P(a);OGATEB::QAR2(A),XB(a)
        • P(a);OGATEB::QAR2(A),XR(a)
        • P(b);::QAB1(A)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • Q(A);P_PINP(b)
      • Vars
        • P(a);OGATEB::QAR2(A),XQ(a)
        • P(a);OGATEB::QAR2(A),XS(a)
        • P(a);OGATEB::QAR2(A),XB(a)
        • P(a);OGATEB::QAR2(A),XR(a)
      • Refutation
        • K(c);N_SPINP(b),S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • P(a);OGATEB::QAR2(A),XQ(a)
        • P(a);OGATEB::QAR2(A),XS(a)
        • P(a);OGATEB::QAR2(A),XB(a)
        • P(a);OGATEB::QAR2(A),XR(a)
        • P(b);::QAB1(A)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • R(C);
    • Threat
      • S(D)
    • Vars
      • K(c);S_FLIGHT,XR(C)::QAB1(A)
      • P(b);::QAB1(A)
      • P(a);OGATE::QAB1(A)
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